Low-Power Audio/Video Switch Dual SCART Connectors MAX9598 dual S

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Low-Power Audio/Video Switch Dual SCART Connectors MAX9598 dual S

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19-3209; 2/09
Low-Power Audio/Video Switch Dual SCART Connectors
MAX9598 dual SCART matrix routes audio video signals between set-top decoder chip external SCART connectors under control. Operating from 3.3V supply supply, MAX9598 consumes 70mW during quiescent operation 471mW during average operation when driving typical signals into typical loads. Video input detection, video load detection, 1.7mW low-power mode facilitate design lowpower set-top boxes. MAX9598 audio section contains buffered crosspoint route audio inputs audio outputs. DirectDrive® output amplifiers create 2VRMS full-scale audio signal biased around ground, eliminating need bulky output capacitors reducing clickand-pop noise. zero-cross detection circuitry also further reduces clicks pops enabling audio sources switch only during zero-crossing. MAX9598 video section contains buffered crosspoint route video inputs video outputs. standarddefinition video signals from set-top decoder chip lowpass filtered remove out-of-bandwidth artifacts. MAX9598 also supports slow-switching fast-switching signals. interrupt signal from MAX9598 informs microcontroller (µC) when system status changed. MAX9598 available compact 40-pin thin package specified over +70°C commercial temperature range.
DirectDrive registered trademark Maxim Integrated Products, Inc.
Features
70mW Quiescent Power Consumption 1.7mW Low-Power Mode Consumption 0.1mW Shutdown Consumption Clickless/Popless, DirectDrive Audio Video Input Detection Video Load Detection Video Reconstruction Filter with 10MHz Passband 52dB Attenuation 27MHz 3.3V Supply Voltages
MAX9598
Applications
Set-Top Boxes Players
Ordering Information
PART MAX9598CTL+ TEMP RANGE +70°C PIN-PACKAGE TQFN-EP*
+Denotes lead(Pb)-free/RoHS-compliant package. Exposed pad.
System Block Diagram
CHIP INTERRUPT OUTPUT VVID 3.3V VAUD 3.3V
MAX9598
RGB, Y/C, CVBS INTERFACE REGISTERS CVBS AUDIO SCART
VIDEO ENCODER STEREO AUDIO
RGB, Y/C, CVBS
VIDEO FILTERS CROSSPOINT AUDIO CROSSPOINT WITH DirectDrive OUTPUTS SLOW SWITCHING FAST SWITCHING CHARGE PUMP GNDVID
SLOW SWITCHING FAST SWITCHING
SINGLE-ENDED STEREO AUDIO
Y/C, CVBS RGB, Y/C, CVBS AUDIO SLOW SWITCHING FAST SWITCHING SCART
Maxim Integrated Products
pricing, delivery, ordering information, please contact Maxim Direct 1-888-629-4642, visit Maxim's website www.maxim-ic.com.
Low-Power Audio/Video Switch Dual SCART Connectors MAX9598
ABSOLUTE MAXIMUM RATINGS
VVID GNDVID .-0.3V .-0.3V +14V VAUD .-0.3V GNDVID .-0.1V +0.1V Video Inputs, VCRIN_FS GNDVID .-0.3V Audio Inputs EP.-1V SDA, SCL, DEV_ADDR, GNDVID .-0.3V TV_SS, VCR_SS .-0.3V (V12 0.3V) Current Video/Audio Inputs.±20mA C1P, C1N, CPVSS .±50mA Output Short-Circuit Current Duration Video Outputs, TVOUT_FS VVID, GNDVID .Continuous Audio Outputs VAUD, .Continuous TV_SS, VCR_SS V12, .Continuous Continuous Power Dissipation +70°C) 40-Pin Thin (derate 26.3mW/°C above +70°C) .2105.3mW Operating Temperature Range .0°C +70°C Junction Temperature .+150°C Storage Temperature Range .-65°C +150°C Lead Temperature (soldering, 10s) .+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated operational sections specifications implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
ELECTRICAL CHARACTERISTICS
(V12 12V, VVID VAUD 3.3V, VGNDVID load, +70°C, unless otherwise noted. Typical values +25°C.) (Note
PARAMETER Video Supply Voltage Range Audio Supply Voltage Range Supply Voltage Range SYMBOL VVID VAUD CONDITIONS Inferred from video PSRR test 3.6V Inferred from audio PSRR test 3.6V Inferred from slow-switching levels Normal operation (Note with video outputs enabled muted VVID Quiescent Supply Current IVID_Q Low-power mode Shutdown VAUD Quiescent Supply Current IAUD_Q Normal operation (Note Shutdown state Quiescent Supply Current I12_Q Normal operation (Note Shutdown VIDEO CHARACTERISTICS DC-COUPLED INPUT Input Voltage Range Input Current Input Resistance AC-COUPLED INPUT Sync-Tip Clamp Level Sync Crush VCLP Sync-tip clamp Sync-tip clamp, percentage reduction sync pulse (0.3VP-P), guaranteed input clamping current measurement -3.5 GNDVID VVID/2, inferred from gain test 0.3V VVID VVID 3.135V VVID 3.3V 1.15 VP-P Slow-switching output sets medium level 11.4 18.2 18.4 0.25 12.6 1000 UNITS
Low-Power Audio/Video Switch Dual SCART Connectors
ELECTRICAL CHARACTERISTICS (continued)
(V12 12V, VVID VAUD 3.3V, VGNDVID load, +70°C, unless otherwise noted. Typical values +25°C.) (Note
PARAMETER Input Clamping Current Maximum Input Source Resistance Bias Voltage Input Resistance CHARACTERISTICS Voltage Gain VBIAS Bias circuit Bias circuit Guaranteed output-voltage swing Guaranteed output-voltage swing TV_R/C_OUT, TV_G_OUT, TV_B_OUT; first input signal VCR_R/C_IN, VCR_G_IN, VCR_B_IN; second signal ENC_R/C_IN, ENC_G_IN, ENC_B_IN Sync-tip clamp (VIN VCLP) Bias circuit Sync-tip clamp, measured output, VVID VCLP (VCLP +1.15V), VVID/2, GNDVID Measured output, VVID 3.135V, VCLP (VCLP +1.2V), VVID/2, GNDVID Bias circuit, measured output, VVID (VBIAS 0.575V) (VBIAS 0.575V), VVID/2, GNDVID Measured output, VVID 3.135V, (VBIAS 0.6V) (VBIAS 0.6V), VVID/2, GNDVID Output Short-Circuit Current Output Resistance Output Leakage Current Power-Supply Rejection Ratio CHARACTERISTICS Filter Passband Flatness Filter Attenuation Slew Rate Settling Time Differential Gain Differential Phase Pulse-to-Bar Rating VOUT 2VP-P, 100kHz 10MHz VOUT 2VP-P, attenuation referred 100kHz 11MHz 27MHz 54MHz 0.15 V/µs
Degrees
MAX9598
SYMBOL
CONDITIONS Sync-tip clamp, 0.3V
UNITS
0.57
0.60
0.63
1.95
2.05
Gain Mismatch Between Outputs
Output Level
0.19 1.35
0.30 1.50
0.40 1.62
2.34
2.40
2.46 VP-P
Output-Voltage Swing
2.34
2.40
2.46
ROUT Output disabled (load detection active) VVID 3.6V
VOUT 2VP-P, filter video path VOUT 2VP-P, settle 0.1% (Note 5-step modulated staircase, 4.43MHz 5-step modulated staircase, 4.43MHz 200ns, time 18µs; beginning 2.5% ending 2.5% time ignored
Low-Power Audio/Video Switch Dual SCART Connectors MAX9598
ELECTRICAL CHARACTERISTICS (continued)
(V12 12V, VVID VAUD 3.3V, VGNDVID load, +70°C, unless otherwise noted. Typical values +25°C.) (Note
PARAMETER Pulse Response Response Nonlinearity Group Delay Distortion Glitch Impulse Caused Charge-Pump Switching Peak Signal-to-RMS Noise Power-Supply Rejection Ratio Output Impedance Video Crosstalk Reverse Isolation SYMBOL 200ns 200ns, time 18µs; beginning 2.5% ending 2.5% time ignored 5-step staircase 100kHz 5MHz, outputs 2VP-P Measured outputs 100kHz 5MHz 100kHz, 100mVP-P 5MHz 4.43MHz SCART inputs encoder inputs, fullpower mode with being looped through 4.43MHz Enable VCR_R/C_OUT pulldown through interface -0.707V +0.707V -0.707V +0.707V 20Hz 20kHz, 0.25VRMS input 0.25VRMS input, frequency where output -3dB referenced 1kHz sustained oscillations, series resistor output -0.707V +0.707V 1kHz, input signal, grounded 1kHz, 0.25VRMS input, 20Hz 20kHz 3.33k, 1kHz, 0.25VRMS input 3.33k, 1kHz, 0.5VRMS input 1kHz 1kHz 1kHz, 0.25VRMS input 1kHz, 0.25VRMS input 0.0014 0.001 3.95 -1.5 0.006 CONDITIONS UNITS
Pulldown Resistance AUDIO CHARACTERISTICS Voltage Gain Gain Mismatch Flatness Frequency Bandwidth Capacitive Drive Input Resistance Input Bias Current Input Signal Amplitude Output Level Signal-to-Noise Ratio Total Harmonic Distortion Plus Noise Output Impedance Power-Supply Rejection Ratio Mute Suppression Audio Crosstalk
4.05 +1.5
VRMS
Low-Power Audio/Video Switch Dual SCART Connectors MAX9598
ELECTRICAL CHARACTERISTICS (continued)
(V12 12V, VVID VAUD 3.3V, VGNDVID load, +70°C, unless otherwise noted. Typical values +25°C.) (Note
PARAMETER VIDEO-TO-AUDIO INTERACTION Crosstalk CHARGE PUMP Switching Frequency FAST SWITCHING Input Input High Level Input Current Output Voltage Output High Voltage Output Resistance Rise Time Fall Time SLOW SWITCHING Input Voltage Input Medium Voltage Input High Voltage Input Current Output Voltage Output Medium Voltage Output High Voltage DIGITAL INTERFACE Input High Voltage Input Voltage Input Hysteresis Input Leakage Current Input Capacitance 0.1VVID 3.3V, 0.1VVID 3.3V, pins fast-mode devices must obstruct lines switched fSCL tBUF tHD, ISINK VHYS IIH, VVID VVID 0.06 VVID 11.4V 12.6V 11.4V 12.6V 11.4V 12.6V GNDVID GNDVID 0.5mA 0.5mA VVID Video input: 15kHz, 1VP-P signal, Audio input: 15kHz, 0.5VRMS signal SYMBOL CONDITIONS UNITS
Input Current
Output Voltage Serial Clock Frequency Free Time Between STOP START Condition Hold Time, (Repeated) START Condition
Low-Power Audio/Video Switch Dual SCART Connectors MAX9598
ELECTRICAL CHARACTERISTICS (continued)
(V12 12V, VVID VAUD 3.3V, VGNDVID load, +70°C, unless otherwise noted. Typical values +25°C.) (Note
PARAMETER Period Clock High Period Clock Setup Time Repeated START Condition Data Hold Time Data Setup Time Fall Time Transmitting Setup Time STOP Condition Pulse Width Spike Suppressed OTHER DIGITAL DEV_ADDR Level DEV_ADDR High Level DEV_ADDR Input Current Interrupt Output Voltage Interrupt Output Leakage Current 0.5mA high impedance VVID VVID SYMBOL tLOW tHIGH tSU, tHD, tHD, tSU, Input filters inputs suppress noise spikes less than 50ns ISINK 6mA, total capacitance line measured between 0.3VVID 0.7VVID, 400pF (Note CONDITIONS UNITS
Note Note Note Note
devices 100% production tested +25°C. Specifications over temperature limits guaranteed design. Normal operation mode state. settling time measured from input swing 0.1% final value output. master device must provide hold time least 300ns signal (referred signal) order bridge undefined region SCL's falling edge.
Low-Power Audio/Video Switch Dual SCART Connectors
Typical Operating Characteristics
(VVID VAUD 3.3V, 12V, VGNDVID video load GNDVID, audio load +25°C, unless otherwise noted.)
VIDEO SMALL-SIGNAL GAIN FREQUENCY
MAX9598 toc01
MAX9598
VIDEO SMALL-SIGNAL GAIN FLATNESS FREQUENCY
GAIN FLATNESS (dB) -0.5 -1.0 -1.5 -2.0 -2.5 -3.0 FILTER GAIN (dB) FILTER
MAX9598 toc02
VIDEO LARGE-SIGNAL GAIN FREQUENCY
FILTER
MAX9598 toc03 MAX9598 toc09 MAX9598 toc06
GAIN (dB) FILTER VOUT 100mVP-P 100k FILTER
FILTER
-3.5 -4.0 100M
VOUT 100mVP-P 100k 100M
VOUT 2VP-P 100k 100M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
VIDEO LARGE-SIGNAL GAIN FLATNESS FREQUENCY
MAX9598 toc04
VIDEO CROSSTALK FREQUENCY
VIDEO CROSSTALK (dB) GROUP DELAY (ns) FILTER 100k 100M 100k FILTER
MAX9598 toc05
GROUP DELAY FREQUENCY
GAIN FLATNESS (dB) -0.5 -1.0 -1.5 -2.0 -2.5 -3.0 -3.5 -4.0 100k VOUT 2VP-P FILTER FILTER
100M FREQUENCY (Hz) FREQUENCY (Hz)
100M
FREQUENCY (Hz)
VVID POWER-SUPPLY REJECTION RATIO FREQUENCY
MAX9598 toc07
VIDEO VOLTAGE GAIN TEMPERATURE
2.04 2.03 VOLTAGE GAIN (V/V) 2.02 2.01 2.00 1.99 1.98 1.97 1.96 1.95 TEMPERATURE (°C) 1VP-P, 100kHz
MAX9598 toc08
VIDEO OUTPUT VOLTAGE INPUT VOLTAGE
OUTPUT VOLTAGE
VVID PSRR (dB)
VVID 3.3V 100mVP-P
2.05
INPUT VOLTAGE
FREQUENCY (MHz)
Low-Power Audio/Video Switch Dual SCART Connectors MAX9598
Typical Operating Characteristics (continued)
(VVID VAUD 3.3V, 12V, VGNDVID video load GNDVID, audio load +25°C, unless otherwise noted.)
DIFFERENTIAL GAIN PHASE
DIFFERENTIAL GAIN DIFFERENTIAL GAIN
MAX9598 toc10
DIFFERENTIAL GAIN PHASE
-0.1 -0.2 -0.2 -0.4 4.43MHz, FILTER
MAX9598 toc11
RESPONSE
MAX9598 toc12
-0.1 -0.2 -0.2 -0.4 4.43MHz, FILTER
INPUT 200mV/div
DIFFERENTIAL PHASE (deg)
DIFFERENTIAL PHASE (deg)
OUTPUT 400mV/div
4.43MHz, FILTER
4.43MHz, FILTER 100ns/div
12.5T RESPONSE
MAX9598 toc13
NTC-7 VIDEO TEST SIGNAL
MAX9598 toc14
FIELD SQUARE-WAVE RESPONSE
MAX9598 toc15
INPUT 200mV/div
INPUT 0.5V/div
INPUT 500mV/div
OUTPUT 1V/div OUTPUT 400mV/div OUTPUT 1V/div
400ns/div
10s/div
2ms/div
SYNC CLAMP VOLTAGE TEMPERATURE
MAX9598 toc16
BIAS VOLTAGE TEMPERATURE
MAX9598 toc17
INPUT SYNC-TIP CLAMP CURRENT TEMPERATURE
INPUT SYNC-TIP CLAMP CURRENT 0.3V
MAX9598 toc18
SYNC CLAMP VOLTAGE (mV) TEMPERATURE (°C)
BIAS VOLTAGE (mV)
TEMPERATURE (°C)
TEMPERATURE (°C)
Low-Power Audio/Video Switch Dual SCART Connectors MAX9598
Typical Operating Characteristics (continued)
(VVID VAUD 3.3V, 12V, VGNDVID video load GNDVID, audio load +25°C, unless otherwise noted.)
INPUT CLAMP CURRENT INPUT VOLTAGE
MAX9598 toc19
OUTPUT LEVEL VOLTAGE TEMPERATURE
OUTPUT LEVEL VOLTAGE (mV) GAIN (V/V) TEMPERATURE (°C)
MAX9598 toc20
AUDIO LARGE-SIGNAL FREQUENCY RESPONSE GAIN
MAX9598 toc21
INPUT CLAMP CURRENT
0.25VRMS 100k
INPUT VOLTAGE
FREQUENCY (Hz)
AUDIO CROSSTALK FREQUENCY
0.25VRMS GNDAUD
MAX9598 toc22
AUDIO TOTAL HARMONIC DISTORTION PLUS NOISE FREQUENCY
MAX9598 toc23
VAUD POWER-SUPPLY REJECTION RATIO FREQUENCY
VAUD 3.3V 100mVP-P VAUD PSRR (dB) -100
MAX9598 toc24
AUDIO CROSSTALK (dB)
THD+N
0.01
250mVRMS
0.001 -100 -120 FREQUENCY (Hz) 100k 0.0001 500mVRMS FREQUENCY (Hz) 100k
-120 FREQUENCY (Hz) 100k
VVID SUPPLY CURRENT TEMPERATURE
MAX9598 toc25
VAUD SUPPLY CURRENT TEMPERATURE
MAX9598 toc26
SUPPLY CURRENT TEMPERATURE
MAX9598 toc27
VVID SUPPLY CURRENT (mA) TEMPERATURE (°C)
1000
VAUD SUPPLY CURRENT (mA)
SUPPLY CURRENT (nA) TEMPERATURE (°C)
TEMPERATURE (°C)
Low-Power Audio/Video Switch Dual SCART Connectors MAX9598
Description
NAME DEV_ADDR Clock Input Device Address Input. Connect DEV_ADDR GNDVID, VVID, SCL. Table Interrupt Output. This open-drain output that pulls down GNDVID indicate change slow-switching input, activity status composite video inputs, load status composite video outputs. Audio Supply. Connect 3.3V supply. Bypass with 10µF aluminum electrolytic capacitor parallel with 0.1µF ceramic capacitor Charge-Pump Flying Capacitor Positive Terminal. Connect capacitor from C1N. Charge-Pump Flying Capacitor Negative Terminal. Connect capacitor from C1N. Charge-Pump Negative Power Supply. Bypass CPVSS with ceramic capacitor Encoder Left-Channel Audio Input Encoder Right-Channel Audio Input SCART Left-Channel Audio Input SCART Right-Channel Audio Input SCART Left-Channel Audio Output SCART Left-Channel Audio Output SCART Right-Channel Audio Output SCART Right-Channel Audio Output SCART Bidirectional Slow-Switch Signal +12V Supply. Bypass with 0.1µF capacitor SCART Bidirectional Slow-Switch Signal SCART Fast-Switching Logic Output SCART Fast-Switching Input Encoder Blue Video Input Encoder Green Video Input SCART Blue Video Input SCART Green Video Input SCART Blue Video Output SCART Green Video Output Video Ground SCART Red/Chroma Video Input Video Digital Supply. Connect +3.3V supply. Bypass with parallel 0.1µF ceramic capacitor GNDVID. VVID also serves digital supply interface. FUNCTION Bidirectional, Data I/O. Output open drain tolerates 3.6V.
VAUD CPVSS ENC_INL ENC_INR VCR_INL VCR_INR TV_OUTL VCR_OUTL VCR_OUTR TV_OUTR TV_SS VCR_SS TVOUT_FS VCRIN_FS ENC_B_IN ENC_G_IN VCR_B_IN VCR_G_IN TV_B_OUT TV_G_OUT GNDVID VCR_R/C_IN VVID
Low-Power Audio/Video Switch Dual SCART Connectors
Description (continued)
NAME ENC_C_IN ENC_R/C_IN TV_R/C_OUT VCR_R/C_OUT Encoder Chroma Video Input Encoder Red/Chroma Video Input SCART Red/Chroma Video Output SCART Red/Chroma Video Output FUNCTION
MAX9598
VCR_Y/CVBS_OUT SCART Luma/Composite Video Output TV_Y/CVBS_OUT VCR_Y/CVBS_IN TV_Y/CVBS_IN ENC_Y_IN ENC_Y/CVBS_IN SCART Luma/Composite Video Output SCART Luma/Composite Video Input SCART Luma/Composite Video Input Encoder Luma Video Input Encoder Luma/Composite Video Input Exposed Pad. exposed internal ground audio amplifiers charge pump. low-impedance connection between ground required proper isolation.
Detailed Description
MAX9598 represents Maxim's third generation SCART1 audio/video (A/V) switches. Under control, these devices route audio, video, control information between set-top decoder chip SCART connectors. audio signals left audio right audio. video signals composite video with blanking sync (CVBS) component video (red, green, blue). S-video (Y/C) transported across SCART interface CVBS reassigned luma reassigned chroma (C). Support S-video optional. slow-switch signal fast-switch signal carry control information. slowswitch signal 12V, trilevel signal that indicates whether picture aspect ratio 16:9 causes television internal source such antenna. fast-switch signal indicates whether television should display CVBS signals. CVBS, left audio, right audio full duplex. other signals half duplex. Therefore, device link must designated transmitter other device must designated receiver.
low-power consumption advanced monitoring functions MAX9598 enable creation lower power set-top boxes, televisions, players. Unlike competing SCART ICs, audio video circuits MAX9598 operate entirely from 3.3V rather than from 12V. Only slow-switch circuit MAX9598 requires supply. MAX9598 also circuits that detect activity CVBS inputs, loads CVBS outputs, level slow-switch signals. signal informs there changes that intelligently decide whether power power down equipment. addition, MAX9598 DirectDrive audio circuitry eliminate click-and-pop noise. With DirectDrive, bias audio line outputs always ground, matter whether MAX9598 being powered powered down. Conventional audio line output drivers that operate from single supply require series AC-coupling capacitors. During power-up, bias AC-coupling capacitor moves from ground positive voltage, during power-down, opposite occurs. changing bias usually causes audible transient.
1SCART (from Syndicat Constructeurs d'Appareils French-originated standard associated 21-pin connector connecting audio-visual equipment together. official standard SCART CENELEC document number 50049-1. From Wikipedia.
Low-Power Audio/Video Switch Dual SCART Connectors MAX9598
Audio Section
audio circuit essentially stereo, 2x2, nonblocking, audio crosspoint with output drivers. encoder (stereo audio DAC) input sources, outputs SCART connector SCART connector. Figure integrated charge pump inverts +3.3V supply create -3.3V supply. audio circuit operates from bipolar supplies audio signal always biased ground.
MAX9598
ZERO-CROSS DETECTOR
VAUD
ENC_INL VCR_INL 4V/V TV_OUTL
VAUD
4V/V VCR_OUTL
ZERO-CROSS DETECTOR
VAUD
ENC_INR VCR_INR 4V/V TV_OUTR
VAUD
4V/V VCR_OUTR
VAUD CPVSS
CHARGE PUMP
Figure MAX9598 Audio Section Functional Diagram
Low-Power Audio/Video Switch Dual SCART Connectors
Clickless Switching audio channel incorporates zero-crossing detect (ZCD) circuit that minimizes click noise abrupt signal level changes that occur when switching between audio signals arbitrary moment. implement zero-crossing function when switching audio signals, high (Audio Control Register 00h, Then mute high (Audio Control Register, 00h, Next, wait sufficient period time audio signal cross zero. This period function audio signal path's low-frequency corner (fL3dB). Thus, fL3dB 20Hz, time period wait zero-crossing detect 1/20Hz 50ms. After wait period, select audio source audio channel writing bits Audio Control Register (01h). Finally, clear mute (Audio Control Register, 00h, leave (Audio Control Register, 00h, high. MAX9598 switches signal mute next zero crossing. Tables Audio Outputs MAX9598 audio output amplifiers feature Maxim's patented DirectDrive architecture, thereby eliminating need output-coupling capacitors required conventional single-supply audio line drivers. internal charge pump inverts positive supply (VAUD), creating negative supply (CPVSS). audio output amplifiers operate from these bipolar supplies with their outputs biased about audio ground (Figure benefit this audio ground bias that amplifier outputs have component. DC-blocking capacitors required with conventional audio line drivers unnecessary, conserving board space, reducing system cost, improving frequency response. Conventional single-supply audio line drivers have their outputs biased about nominal voltage (typically half supply) maximum dynamic range. Large coupling capacitors needed block this bias. Clicks pops created when coupling capacitors charged during power-up discharged during power-down. MAX9598 features low-noise charge pump that requires only small ceramic capacitors. 580kHz switching frequency well beyond audio range does interfere with audio signals. switch drivers feature controlled switching speed that minimizes noise video outputs generated turn-on turn-off transients.
MAX9598
VOUT VDD/2
CONVENTIONAL DRIVER-BIASING SCHEME
+VDD
VOUT
-VDD
DirectDrive BIASING SCHEME
Figure Conventional Driver Output Waveform MAX9598 Output Waveform
SCART standard specifies 2VRMS full-scale audio signals. audio circuits process 0.5V full-scale audio signals internal MAX9598, gain-of-4 output amplifiers restore audio signals full scale 2VRMS. select which audio input source routed SCART connector, write bits Audio Control Register (01h). select which audio input source routed SCART connector, write bits Audio Control Register (01h). power-on default audio outputs muted (the inputs output amplifiers connected audio ground). Tables
Video Section
video circuit routes different video formats between set-top decoder, SCART connector, SCART connector. also routes slow-switch fast-switch control information. Figure
Low-Power Audio/Video Switch Dual SCART Connectors MAX9598
ACTIVITY DETECT ACTIVITY DETECT ACTIVITY DETECT ACTIVITY DETECT TV_Y/CVBS_IN VCR_Y/CVBS_IN ENC_Y/CVBS_IN ENC_Y_IN CLAMP CLAMP 2V/V CLAMP CLAMP MUTE LOAD SENSE 2V/V VCR_Y/CVBS_OUT TV_Y/CVBS_OUT LOAD SENSE
MAX9598
VCR_R/C_IN ENC_R/C_IN ENC_C_IN
CLAMP/BIAS 2V/V CLAMP/BIAS CLAMP/BIAS MUTE 2V/V VCR_R/C_OUT TV_R/C_OUT
VCR_G_IN ENC_G_IN
CLAMP 2V/V CLAMP MUTE TV_G_OUT
VCR_B_IN ENC_B_IN
CLAMP 2V/V CLAMP MUTE VVID 1V/V GNDVID TVOUT_FS TV_B_OUT
VCRIN_FS 0.7V 1V/V 1V/V VCR_SS TV_SS
Figure MAX9598 Video Section Functional Diagram
Low-Power Audio/Video Switch Dual SCART Connectors
Video Inputs Whether incoming video signal AC-coupled DC-coupled into MAX9598 depends upon origin, format, voltage range video signal. Table below shows recommended connections. Always AC-couple external video signal through 0.1µF capacitor because voltage well defined (see Typical Application Circuit). example, video transmitter circuit might have different ground than video receiver, thereby level shifting bias. 60Hz power line "hum" might cause video signal slowly change bias. Internal video signals that between DC-coupled. Most video DACs generate video signals between because video sources current into ground-referenced resistor. minority video DACs that generate video signals between 2.3V 3.3V because video sinks current from VVID-referenced resistor, AC-couple video signal MAX9598.
MAX9598 restores level incoming, ACcoupled video signals with either transparent sync-tip clamps bias circuits. When using AC-coupled input, transparent sync-tip clamp automatically clamps input signal minimum ground, preventing from going lower. small current pulls down input prevent AC-coupled signal from drifting outside input range part. sync-tip clamps with CVBS, RGB, luma signals. transparent sync-tip clamp "transparent" when incoming video signal DC-coupled above ground. Under such conditions, clamp never activates. Therefore, outputs video DACs that typically generate signals between directly connected MAX9598 inputs. bias circuit accepts AC-coupled chroma, which subcarrier with color information modulated onto bias voltage bias circuits 600mV. ENC_R/C_IN VCR_R/C_IN receive either video signal chroma video signal. input configuration writing bits Video Input Control Register (08h). Tables MAX9598 also video input detection. When activated, activity detect circuits check sync present incoming CVBS signals. then there valid video signal. Read bits Video Activity Status Register (0Fh) determine status CVBS inputs. Table
MAX9598
Video Reconstruction Filter video outputs set-top decoder chip need lowpass-filtered reject out-of-band noise. MAX9598 integrates 6th-order, Butterworth filters. filter passband (±1dB) typically 10MHz, attenuation 27MHz 52dB. filters suited standard-definition video. Video Outputs video output amplifiers both source sink load current, allowing output loads AC-coupled. amplifier output stage needs around 300mV headroom from either supply rail. video signals with sync pulse, sync will typically 300mV, shown Figure chroma signal, blank level will typically 1.5V, shown Figure
Table Recommended Coupling Incoming Video Signals Input Circuit Configuration. (Use 0.1µF Capacitor AC-Couple Video Signal into MAX9598)
VIDEO ORIGIN External External External External Internal Internal Internal Internal Internal Internal Internal Internal FORMAT CVBS CVBS CVBS VOLTAGE RANGE Unknown Unknown Unknown Unknown COUPLING INPUT CIRCUIT CONFIGURATION Transparent Sync Clamp Transparent Sync Clamp Transparent Sync Clamp Bias Circuit Transparent Sync Clamp Transparent Sync Clamp Transparent Sync Clamp Transparent Sync Clamp Transparent Sync Clamp Transparent Sync Clamp Transparent Sync Clamp Bias Circuit
Low-Power Audio/Video Switch Dual SCART Connectors MAX9598
MAX9598 fig04 MAX9598 fig05
500mV/div
500mV/div
10s/div
20s/div
Figure MAX9598 Video Output with CVBS Signal (Multiburst Video Test Signal Shown)
Figure MAX9598 Video Output with Chroma Signal (75% Color Video Test Signal Shown)
supply voltage greater than 3.135V below 3.3V supply), each amplifier drive DC-coupled video loads ground. supply less than 3.135V, each amplifier drive only DC-coupled AC-coupled video load. SCART standard allows video signals have superimposed component within Therefore, most video signals DC-coupled output. unlikely event that video signal needs ACcoupled, coupling capacitors should 220µF greater order keep highpass filter formed 37.5 equivalent resistance video transmission line corner frequency 4.8Hz below order keep well below 25Hz frame rate standard. CVBS outputs have load sense circuits. enabled, each load sense circuit checks load eight times second connecting internal pullup resistor output 1ms. output pulled then load present. output stays low, then load connected. Read bits determine load status. Table selection video sources that sent SCART connector controlled bits Video Input Control Register (06h) while selection video sources that sent SCART connector controlled bits Video Input Control Register (08h). Tables video outputs enabled disabled bits Output Enable Register (0Dh). Table
Slow Switching MAX9598 supports 933-1, Amendment trilevel slow switching that selects aspect ratio display (TV). Under control, MAX9598 sets slow-switching output voltage level. Table shows valid input levels slow-switching signal corresponding operating modes display device.
bidirectional ports available slow-switching signals VCR. slow-switching input status continuously read stored Status Register (0Eh). slow-switching outputs logic level high impedance writing Video Output Control Register (07h) Video Output Control Register (09h). When enabled, becomes active voltage level changes TV_SS VCR_SS. Tables
Table Slow-Switching Modes
SLOW-SWITCHING SIGNAL VOLTAGE MODE Display device uses internal source such built-in tuner provide video signal Display device uses video signal from SCART connector sets display 16:9 aspect ratio Display device uses signal from SCART connector sets display aspect ratio
12.6
Low-Power Audio/Video Switch Dual SCART Connectors
Fast Switching fast-switching signal originally used switch between CVBS signals pixel-by-pixel basis that on-screen display (OSD) information could inserted. Since modern set-top decoder chips have integrated circuitry, there need create information using older technique. Now, fast-switching signal just used switch between CVBS signal sources. source fast-switching signal writing bits Video Output Control Register (07h). fast switching signal SCART connector enabled disabled Output Enable Register (0Dh). Tables
edge clock pulse. master reads from MAX9598 transmitting slave address with register address register read, REPEATED START (Sr) condition, slave address with followed series pulses. MAX9598 transmits data sync with master-generated pulses. master acknowledges receipt each byte data. Each read sequence framed START REPEATED START (Sr) condition, acknowledge acknowledge, STOP condition. operates both input open-drain output. pullup resistor, typically greater than 500, required bus. operates only input. pullup resistor, typically greater than 500, required there multiple masters bus, master singlemaster system open-drain output. Series resistors line with optional. Series resistors protect digital inputs MAX9598 from high-voltage spikes lines, minimize crosstalk undershoot signals.
MAX9598
Serial Interface
MAX9598 features I2C/SMBusTM-compatible, 2wire serial interface consisting serial data line (SDA) serial clock line (SCL). facilitate communication between MAX9598 master clock rates 400kHz. Figure shows 2-wire interface timing diagram. master generates initiates data transfer bus. master device writes data MAX9598 transmitting START condition, proper slave address with followed register address then data word. Each transmit sequence framed START STOP condition. Each word transmitted MAX9598 bits long followed acknowl-
Transfer data transferred during each cycle. data must remain stable during high period pulse. Changes while high control signals (see START STOP Conditions section). idle high when busy.
tSU, tLOW tHD, START CONDITION tHIGH REPEATED START CONDITION STOP CONDITION START CONDITION tHD, tSU, tBUF tSU, tSU,
Figure Serial-Interface Timing Diagram
SMBus trademark Intel Corporation.
Low-Power Audio/Video Switch Dual SCART Connectors
START STOP Conditions idle high when use. master initiates communication issuing START condition. START condition high-to-low transition with high. STOP condition low-to-high transition while high (Figure START condition from master signals beginning transmission MAX9598. master terminates transmission, frees bus, issuing STOP condition. remains active REPEATED START condition generated instead STOP condition. Early STOP Conditions MAX9598 recognizes STOP condition point during data transmission except STOP condition occurs same high pulse START condition. proper operation, send STOP condition during same high pulse START condition. Slave Address slave address defined MSBs (most significant bits) followed (read/write) bit. configure MAX9598 read mode. configure MAX9598
MAX9598
write mode. slave address always first byte information sent MAX9598 after START REPEATED START condition. MAX9598 slave address configurable with DEV_ADDR. Table shows possible slave addresses MAX9598.
Acknowledge acknowledge (ACK) clocked that MAX9598 uses handshake receipt each byte data when write mode (see Figure MAX9598 pulls down during entire master-generated clock pulse previous byte successfully received. Monitoring allows detection unsuccessful data transfers. unsuccessful data transfer occurs receiving device busy system fault occurred. event unsuccessful data transfer, master retry communication. master pulls down during clock cycle acknowledge receipt data when MAX9598 read mode. acknowledge sent master after each read byte allow data transfer continue. acknowledge sent when master reads final byte data from MAX9598, followed STOP condition.
START CONDITION
CLOCK PULSE ACKNOWLEDGMENT
ACKNOWLEDGE
ACKNOWLEDGE
Figure START, STOP, REPEATED START Conditions
Figure Acknowledge
Table Slave Address
DEV_ADDR GNDVID VVID WRITE ADDRESS (hex) READ ADDRESS (hex)
Low-Power Audio/Video Switch Dual SCART Connectors
Write Data Format write MAX9598 consists transmitting START condition, slave address with data byte configure internal register address pointer, more data bytes, STOP condition. Figure illustrates proper frame format writing byte data MAX9598. Figure illustrates frame format writing bytes data MAX9598. slave address with indicates that master intends write data MAX9598. MAX9598 acknowledges receipt address byte during master-generated ninth pulse. second byte transmitted from master configures MAX9598's internal register address pointer. pointer tells MAX9598 where write next byte data. acknowledge pulse sent MAX9598 upon receipt address pointer data. third byte sent MAX9598 contains data that will written chosen register. acknowledge pulse from MAX9598 signals receipt data byte. address pointer autoincrements next register address after each received data byte. This autoincrement feature allows master write sequential register address locations within continuous frame. master signals transmission issuing STOP condition. Read Data Format master presets address pointer first sending MAX9598's slave address with followed register address after START condition. MAX9598 acknowledges receipt slave address register address pulling during ninth clock pulse. REPEATED START condition then sent followed slave address with MAX9598 transmits contents specified register. Transmitted data valid rising edge master-generated serial clock (SCL). address pointer autoincrements after each read data byte. This autoincrement feature allows registers read sequentially within continuous frame. STOP condition issued after number read data bytes. STOP condition issued followed another read operation, first data byte read will from register address location previous transaction subsequent reads will autoincrement address pointer until next STOP condition. Attempting read from register addresses higher than results repeated reads from dummy register containing data. master acknowledges receipt each read byte during acknowledge clock pulse. master must acknowledge correctly received bytes except last byte. final byte must followed acknowledge from master then STOP condition. Figures illustrate frame format reading data from MAX9598.
ACKNOWLEDGE FROM MAX9598 ACKNOWLEDGE FROM MAX9598 SLAVE ADDRESS ACKNOWLEDGE FROM MAX9598 REGISTER ADDRESS DATA BYTE BYTE AUTOINCREMENT INTERNAL REGISTER ADDRESS POINTER
MAX9598
Figure Writing Byte Data MAX9598
ACKNOWLEDGE FROM MAX9598 ACKNOWLEDGE FROM MAX9598 SLAVE ADDRESS ACKNOWLEDGE FROM MAX9598 REGISTER ADDRESS DATA BYTE BYTE AUTOINCREMENT INTERNAL REGISTER ADDRESS POINTER
ACKNOWLEDGE FROM MAX9598 DATA BYTE BYTE
Figure Writing Bytes Data MAX9598
Low-Power Audio/Video Switch Dual SCART Connectors MAX9598
ACKNOWLEDGE FROM MASTER ACKNOWLEDGE FROM MAX9598 SLAVE ADDRESS ACKNOWLEDGE FROM MAX9598 REGISTER ADDRESS ACKNOWLEDGE FROM MAX9598 SLAVE ADDRESS DATA BYTE BYTE AUTOINCREMENT INTERNAL REGISTER ADDRESS POINTER
REPEATED START
Figure Reading Indexed Byte Data from MAX9598
ACKNOWLEDGE FROM MAX9598 SLAVE ADDRESS
ACKNOWLEDGE FROM MAX9598 REGISTER ADDRESS
ACKNOWLEDGE FROM MAX9598 SLAVE ADDRESS DATA BYTE BYTE AUTOINCREMENT INTERNAL REGISTER ADDRESS POINTER
REPEATED START
Figure Reading Bytes Indexed Data from MAX9598
Interrupt Output
When interrupt enabled modes (see Operating Modes section), INT, which open-drain output, pulls under following conditions: slowswitch signals change value, CVBS input signals detected disappear, CVBS output loads added removed. When interrupt enabled mode pulls only when slow-switch signal changes value. Enable writing into register 01h. Table interrupt cleared reading register 0Fh.
STEREO AUDIO DACS 6.65k ENC_INL 6.65k ENC_INR
MAX9598
Applications Information
Audio Inputs maximum full-scale audio signal that applied audio inputs 0.5V biased ground. recommended application circuit attenuate bias incoming audio signal shown Figure audio path gain 4V/V that full scale audio output signal 2VRMS. less than 2VRMS full scale desired audio outputs, then full scale audio input signal should proportionately decreased below 0.5VRMS.
VALUES CS4334/5/8/9: 4.53k PCM1742: 5.57k
Figure Application Circuit Connect Audio Source Audio Inputs (1µF Capacitor Connected Ground-Referenced Resistors Biases Audio Signal Ground, Resistors Attenuate Audio Signal)
Operating Modes
MAX9598 four operating modes, which writing bits register 10h. Table
Low-Power Audio/Video Switch Dual SCART Connectors MAX9598
Table Register Settings Looping Signals
DESCRIPTION REGISTER Loop signals (Note (Note Default COMMENTS
Note slow-switch output (bits should same slow-switch input. Note User bits appropriately depending upon whether signal chroma.
Shutdown circuitry shut down MAX9598 except interface, which designed with static CMOS logic. Except register 10h, which sets operating mode, values other registers preserved while entering, during, leaving shutdown mode. Low-Power Mode MAX9598 into low-power mode during standby. Everything shut down except slow-switching circuits, CVBS input detection, CVBS load detection, interface. interrupt enabled, then will active whenever slow-switch signal changes; CVBS signal appears disappears; CVBS load appears disappears. set-top then decide whether change MAX9598 fullpower mode loop signals Before entering low-power mode, slow-switch signals should high impedance.
Except registers 0Eh, 0Fh, 10h, value other registers preserved while entering, during, leaving low-power mode. values registers
might change low-power mode because they provide status slow switch signals, CVBS input, CVBS outputs. value register changes while entering leaving low-power mode because bits operating mode. Full-Power Mode with Video Input Detection Video Load Detection this mode, MAX9598 fully interrupt enabled, then will active whenever slowswitch signal changes; CVBS signal appears disappears; CVBS load appears disappears. decide whether change routing configuration operating mode MAX9598.
Full-Power Mode Without Video Input Detection Video Load Detection This mode similar above mode except that video input detection video load detection active. interrupt enabled, then will active only when slow-switch signal changes.
Table Quiescent Power Consumption
OPERATING MODE Shutdown. Low-power mode with slow switching, CVBS input video detection, video load detection active only. Audio circuitry off. Full-power mode WITH input video detection video load detection active. Full-power mode WITHOUT input video detection video load detection active (power-on default). POWER CONSUMPTION (mW)
Low-Power Audio/Video Switch Dual SCART Connectors MAX9598
Table Average Power Consumption
OPERATING MODE Full-power mode WITH input video detection video load detection active. Full-power mode WITHOUT input video detection video load detection active (power-on default). POWER CONSUMPTION (mW)
Table Conditions Average Power Consumption Measurement
NAME VAUD ENC_INL ENC_INR VCR_INL VCR_INR TV_OUTL VCR_OUTL VCR_OUTR TV_OUTR TV_SS VCR_SS TVOUT_FS VCRIN_FS ENC_B_IN ENC_G_IN VCR_B_IN VCR_G_IN TV_B_OUT TV_G_OUT GNDVID VCR_R/C_IN VVID ENC_C_IN ENC_R/C_IN TV_R/C_OUT VCR_R/C_OUT VCR_Y/CVBS_OUT TV_Y/CVBS_OUT VCR_Y/CVBS_IN TV_Y/CVBS_IN ENC_Y_IN ENC_Y/CVBS_IN TYPE Supply Input Input Input Input Output Output Output Output Output Supply Input Output Input Input Input Input Input Output Output Supply Input Supply Input Input Output Output Output Output Input Input Input Input SIGNAL 3.3V 0.25VRMS, 1kHz 0.25VRMS, 1kHz None None 1VRMS, 1kHz 1VRMS, 1kHz 1VRMS, 1kHz 1VRMS, 1kHz 3.3V flat field flat field None None flat field flat field None 3.3V None flat field flat field flat field flat field flat field None None None flat field LOAD ground ground ground ground ground ground ground ground ground ground ground ground
Low-Power Audio/Video Switch Dual SCART Connectors
Power Consumption
quiescent power consumption average power consumption MAX9598 very because 3.3V operation low-power circuit design. Quiescent power consumption defined when MAX9598 operating without loads without audio video signals. Table shows quiescent power consumption four operating modes. Average power consumption defined when MAX9598 drives typical signals into typical loads. Table shows average power consumption full-power mode Table shows input output conditions. nal. pins that carry both CVBS luma have Y/CVBS their names, pins that carry chroma have their names. Now, Y/CVBS signals full duplex while signals half duplex. Therefore, S-video limited being half duplex. MAX9598 transmit chroma signal receive chroma signal same SCART pin, same time. resistor connected VCR_R/C_OUT must back termination resistor when MAX9598 transmitting chroma signal input termination resistor when receiving chroma signal. Figure shows MAX9598 transmits chroma signal SCART connector while Figure shows MAX9598 receives chroma from SCART connector. Write into register open pulldown switch VCR_R/C_OUT. close pulldown switch, write into register turn output amplifier, then write into register 09h. Tables
MAX9598
S-Video
MAX9598 supports S-video from set-top set-top VCR, set-top box. S-video included original SCART specifications added afterwards. consequence, luma signal S-video shares same SCART CVBS signal. Likewise, chroma signal shares same SCART sig-
0.1F
VCR_R/C_IN ENC_R/C_IN ENC_C_IN
BIAS 2V/V BIAS BIAS
TV_R/C_OUT
SCART
2V/V
VCR_R/C_OUT
MAX9598
SCART
Figure Gain-of-2 Amplifier VCR_R/C_OUT Outputs Chroma Signal SCART Connector (Note Pulldown Switch VCR_R/C_OUT Open)
Low-Power Audio/Video Switch Dual SCART Connectors MAX9598
0.1F VCR_R/C_IN ENC_R/C_IN ENC_C_IN
BIAS 2V/V BIAS BIAS
TV_R/C_OUT
SCART
2V/V
VCR_R/C_OUT
MAX9598
SCART
Figure VCR_R/C_IN Receives Chroma Signal from SCART Connector. Notice that Pulldown Switch VCR_R/C_OUT Closed that Gain-of-2 Amplifier Off. Chroma Signal from SCART Looped Through SCART Above Configuration.
TV_OUTR
MAX9598
MONO AUDIO
TV_OUTL TV_Y/CVBS_OUT GREATER
SCART
GREATER
MODULATOR
Figure Application Circuit Connect CVBS Mono Audio from SCART Modulator
Interfacing Modulator
set-top modulates CVBS mono audio onto carrier (for example, channel then simple application circuit provide needed signals (see Figure 16). resistor summer circuit between TV_OUTR TV_OUTL creates mono audio signal. resistor-divider ground TV_Y/CVBS_OUT creates video signal with normal amplitude. unique feature MAX9598 that facilitates this application circuit that audio video output amplifiers
MAX9598 drive multiple loads VAUD VVID both greater than 3.135V.
Floating-Chassis Discharge Protection
Some set-top boxes have floating chassis problem which chassis connected earth ground. result, chassis charge 500V. When SCART cable connected SCART connector, charged chassis discharge through signal pin. equivalent circuit 2200pF capacitor charged
Low-Power Audio/Video Switch Dual SCART Connectors MAX9598
+3.3V 0.1F 3.3V 0.1F 3.3V 0.1F VAUD CHIP TV_SS DEV_ADDR TV_B_OUT TV_G_OUT TV_R/C_OUT TVOUT_FS VIDEO ENCODER ENC_Y/CVBS_IN GNDVID ENC_R/C_IN ENC_G_IN ENC_B_IN VCR_INL ENC_Y_IN VCR_SS ENC_C_IN VCR_B_IN VVID GNDVID VCR_G_IN 0.1F SCART VVID 0.1F 2.55k CPVSS 7.68k VCR_OUTL VAUD CPVSS 7.68k VCR_INR 2.55k VAUD VCR_OUTR VAUD CPVSS GNDVID TV_Y/CVBS_IN VAUD TV_Y/CVBS_OUT VVID 0.1F GNDVID VVID VAUD TV_OUTR VAUD CPVSS CPVSS VVID VVID GNDVID VVID GNDVID VVID GNDVID VVID GNDVID SCART
MAX9598
TV_OUTL
CPVSS
GNDVID VVID VCR_R/C_IN VVID 0.1F
GNDVID VCR_R/C_OUT STEREO AUDIO VVID
GNDVID VCRIN_FS 6.65k ENC_INL VCR_Y/CVBS_OUT 6.65k ENC_INR VCR_Y/CVBS_IN CPVSS GNDVID VVID 0.1F GNDVID GNDVID VVID
VALUES CS4334/5/8/9: 4.53k PCM1742: 5.57k
Figure Application Circuit Connect Series Resistors External Protection Diodes MAX9598 Outputs
Low-Power Audio/Video Switch Dual SCART Connectors
311V connected through less than signal pin. MAX9598 soldered when experiences such discharge. Therefore, current spike flows through both external internal protection devices absorbed supply bypass capacitors, which have high capacitance ESR. better protect MAX9598 against excess voltages during cable discharge condition events, series resistors inputs outputs SCART connector series resistors already present application circuit. Also external protection diodes (for example, BAV99) inputs outputs SCART connector.
MAX9598
with 10µF electrolytic capacitor parallel with 0.1µF ceramic capacitor audio ground. Bypass each VVID video ground with 0.1µF ceramic capacitor.
Power-Supply Bypassing
MAX9598 features single 3.3V supply operation requires negative supply. supply, SCART switching function. V12, place 0.1µF bypass capacitor close possible. Connect VAUD pins together 3.3V bypass
Using Digital Supply MAX9598 designed operate from noisy digital supplies. high PSRR (49dB 100kHz) allows MAX9598 reject noise from digital power supplies (see Typical Operating Characteristics). digital power supply very noisy stripes appear television screen, increase supply bypass capacitance. additional, smaller capacitor parallel with main bypass capacitor reduce digital supply noise because smaller capacitor lower equivalent series resistance (ESR) equivalent series inductance (ESL).
Layout Grounding
optimal performance, controlled-impedance traces video signal paths place input termination resistors output back-termination resistors
Table Data Format Write Mode
REGISTER ADDRESS (HEXADECIMAL) audio output mute audio selection
used
Interrupt enable
used
used
used
used
audio selection
used used used used used used VCR_R/C_IN Clamp used used used used used used used used video switch fast switching used used used used used VCR_Y/CV BS_OUT enable VCR_R/C_ enable TV_R/C_ enable TV_G_OUT enable TV_B_OUT enable TV_Y/CVBS_ enable TVOUT_FS enable used ENC_R/C_IN clamp used video switch used slow switching
video switch VCR_R/C_ ground slow switching
Operating mode
used
Low-Power Audio/Video Switch Dual SCART Connectors MAX9598
Table Data Format Read Mode
REGISTER ADDRESS (HEXADECIMAL) Power-on reset
used
used ENC_Y_IN input video detection ENC_Y/CVBS_IN input video detection
slow-switch input status
slow-switch input status CVBS input video detection
used
CVBS CVBS CVBS input video output load output load detection
Table Register 00h: Audio Control
DESCRIPTION Audio Mute Zero-Crossing Detector (power-on default) (power-on default) COMMENTS
Table Register 01h: Audio Control
DESCRIPTION Input Source Audio Input Source Audio Interrupt Enable Encoder audio audio used Mute (power-on default) Encoder audio audio used Mute (power-on default) Disabled (power-on default) Enabled COMMENTS
close MAX9598. Avoid routing video traces parallel high-speed data lines. MAX9598 provides separate ground connections video audio supplies. best performance, separate ground planes each ground returns connect ground planes together single point. Refer MAX9598 Evaluation proven layout example.
MAX9598 mounted using flow soldering wave soldering, ground via(s) exposed should have finished hole size least mils ensure adequate wicking soldering onto exposed pad. MAX9598 mounted using solder mask technique, requirement does apply. either case, good connection between exposed ground required order minimize noise from coupling onto outputs.
Low-Power Audio/Video Switch Dual SCART Connectors MAX9598
Table Register 06h: Video Input Control
DESCRIPTION Input Sources Video Input Sources TV_G_OUT TV_B_OUT TV_Y/CVBS_OUT ENC_Y/CVBS_IN ENC_Y_IN VCR_Y/CVBS_IN TV_Y/CVBS_IN used Mute Mute Mute (power-on default) TV_G_OUT ENC_G_IN VCR_G_IN Mute Mute (power-on default) COMMENTS TV_R/C_OUT ENC_R/C_IN ENC_C_IN VCR_R/C_IN MUTE used Mute Mute Mute (power-on default) TV_B_OUT ENC_B_IN VCR_B_IN Mute Mute (power-on default)
Table Register 07h: Video Output Control
DESCRIPTION Slow Switching Fast Switching COMMENTS 2V). Internal source (power-on default). Medium (4.5V 7V). External SCART source with 16:9 aspect ratio. High impedance High 9.5V). External SCART source with aspect ratio. GNDVID (power-on default) used Same level VCR_FB_IN VVID
Low-Power Audio/Video Switch Dual SCART Connectors MAX9598
Table Register 08h: Video Input Control
DESCRIPTION Input Sources Video ENC_R/C_IN Clamp/Bias VCR_R/C_IN Clamp/Bias VCR_Y/CVBS_OUT ENC_Y/CVBS_IN ENC_Y_IN VCR_Y/CVBS_IN TV_Y/CVBS_IN used Mute Mute Mute (power-on default) COMMENTS VCR_R/C_OUT ENC_R/C_IN ENC_C_IN VCR_R/C_IN MUTE used Mute Mute Mute (power-on default)
restore clamp active input (power-on default) Chrominance bias applied input restore clamp active input (power-on default) Chrominance bias applied input
Table 09h: Video Output Control
DESCRIPTION Function Switching VCR_R/C_OUT Ground Ground. Pulldown TV_R/C_OUT output amplifier driving VCR_R/C_OUT turns off. COMMENTS 2V). Internal source (power-on default) Medium (4.5V 7V). External SCART source with 16:9 aspect ratio. High impedance High 9.5V). External SCART source with aspect ratio. Normal operation. Pulldown TV_R/C_OUT (power-on default).
Low-Power Audio/Video Switch Dual SCART Connectors MAX9598
Table Register 0Dh: Output Enable
DESCRIPTION TVOUT_FS Enable TV_Y/CVBS_OUT Enable TV_B_OUT Enable TV_G_OUT Enable TV_R/C_OUT Enable VCR_R/C_OUT Enable VCR_Y/CVBS_OUT Enable (power-on default) (power-on default) (power-on default) (power-on default) (power-on default) (power-on default) COMMENTS (power-on default)
Table Register 10h: Operating Modes
DESCRIPTION Operating Mode Full-power mode WITH input video detection video load detection active. Full-power mode WITHOUT input video detection video load detection active (power-on default). Shutdown. Low-power mode with slow switching, CVBS input video detection, video load detection active only, audio circuitry off. COMMENTS
Low-Power Audio/Video Switch Dual SCART Connectors MAX9598
Table Register 0Eh: Status
DESCRIPTION Slow-Switching Input Status Slow-Switching Input Status Power-On Reset internal source 4.5V external source with 16:9 aspect ratio used 9.5V 12.6V, external source with aspect ratio internal source 4.5V external source with 16:9 aspect ratio used 9.5V 12.6V, external source with aspect ratio V_DIG digital logic operate V_DIG high enough digital logic operate COMMENTS
Table Register 0Fh: Video Activity Status
DESCRIPTION CVBS Input Video Detection CVBS Output Load CVBS Input Video Detection CVBS Output Load ENC_Y/CVBS_IN Input Video Detection ENC_Y_IN Input Video Detection COMMENTS video detected Video detected load connected Load connected video detected Video detected load connected Load connected video detected Video detected video detected Video detected
Low-Power Audio/Video Switch Dual SCART Connectors MAX9598
Typical Application Circuit
3.3V 0.1F 3.3V 0.1F 3.3V 0.1F
CHIP
VVID
VAUD TV_OUTR
TV_OUTL
MAX9598
TV_SS TV_B_OUT TV_G_OUT TV_R/C_OUT SCART
DEV_ADDR
VIDEO ENCODER ENC_Y/CVBS_IN
TVOUT_FS TV_Y/CVBS_OUT 0.1F TV_Y/CVBS_IN ENC_R/C_IN ENC_G_IN VCR_OUTR 7.68k VCR_INR 2.55k ENC_B_IN VCR_OUTL VCR_INL ENC_Y_IN VCR_SS 0.1F ENC_C_IN 0.1F VCR_G_IN 0.1F VCR_R/C_IN VCR_R/C_OUT 6.65k ENC_INL 6.65k ENC_INR VCR_Y/CVBS_IN CPVSS VCR_Y/CVBS_OUT 0.1F VCRIN_FS VCR_B_IN SCART 2.55k 7.68k GNDVID
STEREO AUDIO
VALUES CS4334/5/8/9: 4.53k PCM1742: 5.57k
Low-Power Audio/Video Switch Dual SCART Connectors
Configuration
VIEW
VCR_R/C_IN TV_G_OUT TV_B_OUT VCR_G_IN ENC_G_IN VCR_B_IN ENC_B_IN VCRIN_FS GNDVID VVID
MAX9598
ENC_C_IN ENC_R/C_IN TV_R/C_OUT VCR_R/C_OUT VCR_Y/CVBS_OUT TV_Y/CVBS_OUT VCR_Y/CVBS_IN TV_Y/CVBS_IN ENC_Y_IN ENC_Y/CVBS_IN DEV_ADDR VAUD CPVSS ENC_INL ENC_INR TVOUT_FS VCR_SS TV_SS TV_OUTR
MAX9598
VCR_OUTR VCR_OUTL
TV_OUTL VCR_INR VCR_INL
THIN (6mm 6mm)
EXPOSED
Chip Information
PROCESS: BiCMOS
Low-Power Audio/Video Switch Dual SCART Connectors MAX9598
Package Information
latest package outline information land patterns, www.maxim-ic.com/packages. PACKAGE TYPE TQFN-EP PACKAGE CODE T4066+3 DOCUMENT 21-0141
THIN.EPS
Low-Power Audio/Video Switch Dual SCART Connectors
Package Information (continued)
latest package outline information land patterns, www.maxim-ic.com/packages.
MAX9598
Low-Power Audio/Video Switch Dual SCART Connectors MAX9598
Revision History
REVISION NUMBER REVISION DATE 1/08 1/09 Initial release Corrected various errors DESCRIPTION PAGES CHANGED
Maxim cannot assume responsibility circuitry other than circuitry entirely embodied Maxim product. circuit patent licenses implied. Maxim reserves right change circuitry specifications without notice time.
_Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 408-737-7600 2009 Maxim Integrated Products Maxim registered trademark Maxim Integrated Products, Inc.

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