Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint

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Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint

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19-1397; 10/98
Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches
Selectable Soft Switching Mode Clickless Audio Operation Typical On-Resistance (±5V Supplies) Typical On-Resistance Matching Between Channels Typical On-Resistance Flatness 0.014% Total Harmonic Distortion with Load -110dB Off-Isolation 20kHz -78dB Off-Isolation 4MHz -95dB Crosstalk 20kHz -54dB Crosstalk 4MHz Serial Interface 2-Wire, Fast-Mode, I2C-Compatible (MAX4550) 3-Wire, SPI/QSPI/MICROWIRE-Compatible (MAX4570) Four Auxiliary Outputs that Extend Ports Single-Supply Operation: +2.7V +5.5V Dual-Supply Operation: ±2.7V ±5.5V
MAX4550/MAX4570
MAX4550/MAX4570 serial-interface, programmable, dual audio/video crosspoint switches ideal multimedia applications. Each device contains identical crosspoint switch arrays, each with four inputs outputs. improve off-isolation, additional crosspoint inputs shunts. Each output selectively programmable clickless regular mode operation. internal resistive voltagedividers supplies bias each output when using AC-coupled inputs. Additionally, four auxiliary outputs control additional circuitry MAX4550/MAX4570's 2-wire 3-wire interface. MAX4550/MAX4570 feature on-resistance, on-resistance matching between channels, onresistance flatness, 0.014% total harmonic distortion. Additionally, they feature off-isolation least -110dB audio frequency range -78dB 4MHz, with -95dB crosstalk audio frequency range -54dB 4MHz. MAX4550 uses 2-wire 2C-compatible serial interface, while MAX4570 uses 3-wire SPITM/QSPIor MICROWIRETM-compatible serial interface. These parts available 28-pin SSOP wide packages tested over either commercial (0°C +70°C) extended (-40°C +85°C) operating temperature range.
Configuration
VIEW
NO3A NO3B BIASH NO2B NO2A
Applications
Set-Top Boxes Multimedia Boards High-End Audio Systems Video Conferencing Systems
Ordering Information
PART MAX4550CAI MAX4550CWI MAX4550EAI MAX4550EWI MAX4570CAI MAX4570CWI MAX4570EAI MAX4570EWI TEMP. RANGE +70°C +70°C -40°C +85°C -40°C +85°C +70°C +70°C -40°C +85°C -40°C +85°C PIN-PACKAGE SSOP Wide SSOP Wide SSOP Wide SSOP Wide
BIASL NO4A NO4B COM2A COM2B (CS) (SCLK)
MAX4550 MAX4570
NO1B NO1A COM1A COM1B (DOUT) (DIN)
trademark Philips Corp. SPI/QSPI trademarks Motorola, Inc. MICROWIRE trademark National Semiconductor Corp.
SO/SSOP
MAX4570.
Functional Diagram appears data sheet.
Maxim Integrated Products
free samples latest literature: http://www.maxim-ic.com, phone 1-800-998-8800. small orders, phone 1-800-835-8769.
Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches MAX4550/MAX4570
ABSOLUTE MAXIMUM RATINGS
-0.3V V-.-0.3V +13.2V .+0.3V BIAS_, COM_ DOUT (Note 1).(V- 0.3V) 0.3V) SCLK, DIN, SCL, SDA, .-0.3V Continuous Current into Terminal.±10mA Peak Current, COM_ (pulsed 1ms, duty cycle max) .±40mA Continuous Power Dissipation +70°C) 28-Pin SSOP (derate 9.52mW/°C above +70°C) .762mW 28-Pin Wide (derate 12.5mW/°C above +70°C) .1000mW Operating Temperature Ranges MAX4550C_I/MAX4570C_I .-0°C +70°C MAX4550E_I/MAX4570E_I .-40°C +85°C Storage Temperature Range .-65°C +160°C Lead Temperature (soldering, 10sec) .+300°C
Note Signals COM_ exceeding clamped internal diodes. Limit forward-diode current maximum current rating.
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.
ANALOG ELECTRICAL CHARACTERISTICS-Dual Supplies
±5%, ±5%, TMIN TMAX, unless otherwise noted. Typical values +25°C.) (Note PARAMETER ANALOG SWITCHES Analog Signal Range (Note VNO_ VCOM_ ICOM_ 4mA, VNO_ ±3.0V, 4.75V, -4.75V ICOM_ 4mA, VNO_ ±3.0V, 4.75V, -4.75V +25°C TMIN TMAX +25°C TMIN TMAX 0.01 0.01 0.01 TMIN TMAX +25°C TMIN TMAX +25°C TMIN TMAX SYMBOL CONDITIONS UNITS
On-Resistance COM_ On-Resistance Match Between Channels (Note COM_ On-Resistance Flatness (Note Off-Leakage Current (Note COM_ Off-Leakage Current (Note COM_ On-Leakage Current (Note AUDIO PERFORMANCE Total Harmonic Distortion plus Noise Off-Isolation (Note Channel-to-Channel Crosstalk Channel-to-Channel Crosstalk
ICOM_ 4mA; +25°C RFLAT(ON) VNO_ ±3.0V, TMIN TMAX 4.75V; -4.75V NO_(OFF) VNO_ ±4.5V, VCOM_ +4.5V, 5.25V, -5.25V VNO_ ±4.5V, VCOM_ +4.5V, 5.25V, -5.25V VNO_ floating, VCOM_ ±4.5V, 5.25V, -5.25V +25°C
ICOM_(OFF)
ICOM_(ON)
THD+N VISO(A) VCTA(A) VCTA(A)
1kHz, VNO_ 1VRMS, VNO_ 1VRMS, 20kHz, 10k, Shunt switch Shunt switch
0.014 -110
ICOM_ 1VRMS, 20kHz, VNO_ 10k, three channels driven 20kHz
Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches
ANALOG ELECTRICAL CHARACTERISTICS-Dual Supplies (continued)
±5%, ±5%, TMIN TMAX, unless otherwise noted. Typical values +25°C.) (Note PARAMETER VIDEO PERFORMANCE Off-Isolation VISO(V) VCT(V) COFF(NO) tONSD tOFFSD tBBM tONSE tOFFSE RBIAS IReset condition, 2.7V 5.25V Reset condition, -5.25V VNO_ 1VRMS, 4MHz, Shunt switch Shunt switch -5.25 5.25 SYMBOL CONDITIONS UNITS
MAX4550/MAX4570
Channel-to-Channel Crosstalk 0.1dB Bandwidth Off-Capacitance Turn-On Time (Note Turn-Off Time (Note Break-Before-Make Time Turn-On Time Turn-Off Time BIAS NETWORKS Bias Network Resistance POWER SUPPLIES Supply Voltage Range Supply Current (Note Supply Current
VNO_ 1VRMS, 4MHz, three channels driven 4MHz 1MHz, VNO_ 1.5V, VNO_ 1.5V, VNO_ 1.5V VNO_ 1.5V, VNO_ 1.5V, BIASH BIASL
DYNAMIC TIMING WITH CLICKLESS MODE DISABLED (Note
DYNAMIC TIMING WITH CLICKLESS MODE ENABLED (Note Figure
ANALOG ELECTRICAL CHARACTERISTICS-Single Supply
±5%, TMIN TMAX, unless otherwise noted. Typical values +25°C.) (Note PARAMETER ANALOG SWITCHES Analog Signal Range (Note VNO_ VCOM_ ICOM_ 4mA, VNO_ 3.0V, 4.75V ICOM_ 4mA, VNO_ 3.0V, 4.75V ICOM_ 4mA; VNO_ 4.75V +25°C TMIN TMAX +25°C TMIN TMAX +25°C TMIN TMAX +25°C TMIN TMAX 0.01 SYMBOL CONDITIONS UNITS
On-Resistance
On-Resistance Match Between Channels (Note On-Resistance Flatness (Note Off-Leakage Current (Notes
RFLAT
4.5V, INO_ _(OFF) VCOM_ 4.5V; 5.25V
Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches MAX4550/MAX4570
ANALOG ELECTRICAL CHARACTERISTICS-Single Supply (continued)
±5%, TMIN TMAX, unless otherwise noted. Typical values +25°C.) (Note PARAMETER COM_ Off-Leakage Current (Notes COM_ On-Leakage Current (Notes AUDIO PERFORMANCE Total Harmonic Distortion plus Noise Off-Isolation (Note Channel-to-Channel Crosstalk VIDEO PERFORMANCE Off-Isolation (Note Channel-to-Channel Crosstalk 0.1dB Bandwidth Off-Capacitance Turn-On Time (Note Turn-Off Time (Note Break-Before-Make Time Turn-On Time Turn-Off Time BIAS NETWORKS Bias Network Resistance RBIAS BIASH BIASL VISO(V) VTC(V) COFF(NO) tONSD tOFFSD tBBM tONSE tOFFSE VNO_ 1VRMS, 4MHz, Shunt switch Shunt switch THD+N VISO(A) VTC(A) 1kHz, 10k, VNO_ 1VRMS, VNO_ 2.5V VNO_ 1VRMS, 20kHz, 10k, Shunt switch Shunt switch 0.014 -105 SYMBOL CONDITIONS +25°C TMIN TMAX +25°C TMIN TMAX 0.01 0.01 UNITS VNO_ 4.5V, ICOM_ _(OFF) VCOM_ 4.5V; 5.25V VNO_ floating; ICOM_ _(ON) VCOM_ 4.5V; 5.25V
VNO_ 1VRMS, 20kHz, 10k, three channels driven 20kHz
VNO_ 1VRMS, 4MHz, 10k, three channels driven 4MHz RSOURCE 1MHz VNO_ 1.5V, VNO_ 1.5V, VNO_ 1.5V VNO_ 1.5V, VNO_ 1.5V,
DYNAMIC TIMING WITH CLICKLESS MODE DISABLED (Note
DYNAMIC TIMING WITH CLICKLESS MODE ENABLED (Note Figure
ANALOG ELECTRICAL CHARACTERISTICS-Single Supply
±10%, TMIN TMAX, unless otherwise noted. Typical values +25°C.) (Note PARAMETER ANALOG SWITCHES Analog Signal Range (Note VNO_ VCOM_ ICOM_ 4mA, VNO_ 2.7V +25°C TMIN TMAX SYMBOL CONDITIONS UNITS
On-Resistance
Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches
INTERFACE CHARACTERISTICS
+2.7V +5.5V, -5.5V, TMIN TMAX, unless otherwise noted. Typical values +25°C.) (Note PARAMETER AUXILIARY OUTPUTS Output High Voltage Output Voltage ISOURCE GND, 4.75V ISOURCE 0.5mA GND, 2.7V ISINK 6mA, 2.7V ISINK 12mA, 4.75V 3.6V 3.6V 3.6V 3.6V VNO_ 0.01 ISINK ISINK ISOURCE 0.5mA 4.75V 2.7V 0.1Cb 0.1Cb CLOAD 50pF 4.45 4.65 SYMBOL CONDITIONS UNITS
MAX4550/MAX4570
DIGITAL INPUTS (SCK, DIN, SCL, SDA) Input High Voltage Input Voltage Input Hysteresis Input Leakage Current (Note Input Capacitance DIGITAL OUTPUTS (DOUT, SDA) Output Voltage DOUT Output High Voltage Clock Frequency Free Time between Stop Start Condition STOP Condition Setup Time Data Hold Time Data Setup Time Clock Period Clock High Period SCL/SDA Rise Time (Note SCL/SDA Fall Time (Note Operating Frequency SCLK Setup SCLK Hold SCLK Fall Output Data Valid SCLK Rise Setup SCLK Rise Hold fSCL tBUF tSU:STO tHD:DAT tSU:DAT tLOW tHIGH VHYST ILEAK
TIMING +4.75V +5.25V, Figures
TIMING +4.75V +5.25V, Figures fCSS fCSH
Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches MAX4550/MAX4570
INTERFACE CHARACTERISTICS (continued)
+2.7V +5.5V, -5.5V, TMIN TMAX, unless otherwise noted. Typical values +25°C.) (Note PARAMETER SCLK Pulse Width SCLK Pulse Width High Rise Time (SCLK, DIN, Fall Time (SCLK, DIN, Note Note Note Note SYMBOL CONDITIONS UNITS
algebraic convention used this data sheet; most negative value shown minimum column. Guaranteed design. subject production testing. RON(MAX) RON(MIN). On-resistance flatness defined difference between maximum minimum on-resistance values, measured over specified analog signal range. Note Leakage parameters 100% tested maximum rated temperature, guaranteed correlation +25°C. Note Off-isolation (VCOM_ VNO_ VCOM_ output, VNO_ input switch. Note timing measured from clock's falling edge preceding signal 2-wire, from CS's rising edge 3-wire. Turn-Off Time defined output switch 0.5V change, tested with load ground. Turn-On Time measured with load resistor GND. timing shown with respect unless otherwise noted. Note Typical values MAX4570 only. Note Supply current high switch during switch transitions clickless mode, corresponding 40mA total supply transient current requirement. Note Leakage testing single-supply operation guaranteed testing with dual supplies. Note capacitance line Tested with 400pF.
Typical Operating Characteristics
+25°C, unless otherwise noted.)
ON-RESISTANCE VCOM (DUAL SUPPLIES)
AMX4550/4570-01
ON-RESISTANCE VCOM TEMPERATURE (DUAL SUPPLIES)
AMX4550/4570-02
ON-RESISTANCE VCOM (SINGLE SUPPLY)
+3.3V
AMX4550/4570-03
±3.3V ±2.7V
+85°C +70°C +25°C
+2.7V
VCOM ±4.75V
-40°C VCOM
VCOM
Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches
Typical Operating Characteristics (continued)
+25°C, unless otherwise noted.)
MAX4550/MAX4570
ON-RESISTANCE VCOM TEMPERATURE (SINGLE SUPPLY)
AMX4550/4570-04
ON-RESISTANCE TEMPERATURE
AMX4550/4570-05
LEAKAGE CURRENT TEMPERATURE
1000 LEAKAGE CURRENT (pA) NO_OFF COM_ON
AMX4550/4570-06
-40°C +70°C +85°C
10,000
+25°C
COM_OFF
TEMPERATURE (°C) TEMPERATURE (°C)
VCOM
SUPPLY CURRENT TEMPERATURE (DUAL SUPPLIES)
AMX4550/4570-07
SUPPLY CURRENT TEMPERATURE (SINGLE SUPPLY)
AMX4550/4570-08
CHARGE INJECTION VCOM
(pC)
AMX4550/4570-09
SUPPLY CURRENT (µA)
SUPPLY CURRENT (µA) +2.7V
TEMPERATURE (°C)
TEMPERATURE (°C)
VCOM
TURN-ON/TURN-OFF TIMES SUPPLY VOLTAGE (DUAL SUPPLIES)
AMX4550/4570-11
TURN-ON/TURN-OFF TIMES SUPPLY VOLTAGE (SINGLE SUPPLY)
AMX4550/4570-10
OFF-ISOLATION CROSSTALK FREQUENCY
CROSSTALK (dB) CROSSTALK OFF-ISOLATION
AMX4550/4570-12
1000 TIME (ns) tOFF
1200 1100 1000 TIME (ns) tOFF
ISOLATION (dB) -100 -110 -120 -130
FREQUENCY (MHz)
VSUPPLY
VSUPPLY
Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches MAX4550/MAX4570
Typical Operating Characteristics (continued)
+25°C, unless otherwise noted.)
FREQUENCY RESPONSE
AMX4550/4570-13
FREQUENCY RESPONSE
AMX4550/4570-14
LOSS (1dB/div)
0.15 0.10 0.05 LOSS (dB) -0.05 -0.10 -0.15 -0.20 -0.25 -0.30
RLOAD
FREQUENCY (MHz)
THD+NOISE
0.01
0.001 1000 10,000 100,000 FREQUENCY (Hz)
FREQUENCY (MHz)
RISE TIME (SOFT MODE)
AMX4550/4570-16
FALL TIME (SOFT MODE)
AMX4550/4570-17
TURN-ON TIME (HARD MODE)
1V/div
AMX4550/4570-18
200mV/
200mV/
0.5V/div
500µs/div
500µs/div
50ns/div
TURN-OFF TIME (HARD MODE)
AMX4550/4570-19
TURN-ON TIME (SOFT MODE)
AMX4550/4570-20
TURN-OFF TIME (SOFT MODE)
1V/div
AMX4550/4570-21
1V/div
1V/div
0.5V/div
0.5V/div
0.5V/div
25ns/div 5ms/div
5ms/div
AMX4550/4570-15
TOTAL HARMONIC DISTORTION PLUS NOISE FREQUENCY
0.20
Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches
Description
NAME MAX4550 MAX4570 NO3A NO3B BIASH BIASL NO4A NO4B COM2A COM2B SCLK DOUT COM1B COM1A NO1A NO1B VNO2A NO2B Shunt Input Crosspoint shunt capacitor ground connection improve off-isolation, additional input switch matrix Input Crosspoint Input Crosspoint High Side Bias Network. give outputs bias when inputs AC-coupled (refer Using Internal Bias Resistors section). Side Bias Network. give outputs bias when inputs AC-coupled (refer Using Internal Bias Resistors section). Input Crosspoint Input Crosspoint Positive Supply Voltage. Supply range +2.7V +5.25V. Connect externally. Output Crosspoint Auxiliary Output Output Crosspoint Auxiliary Output LSB+1 2-Wire Serial-Interface Address Field Chip Select 3-Wire Interface. Logic enables serial data clocked device. Programming commands executed CS's rising edge. 2-Wire Serial-Interface Clock Input 3-Wire Serial-Interface Clock Input 2-Wire Serial-Interface Data Input. Data clocked SCL's rising edge. 3-Wire Serial-Interface Data Input. Data clocked SCLK's rising edge. LSB+2 2-Wire Serial-Interface Address Field Data Output 3-Wire Interface. Input data clocked SCLK's falling edge delayed clock cycles. DOUT remains active when high. Auxiliary Output Output Crosspoint Auxiliary Output Output Crosspoint Ground Input Crosspoint Input Crosspoint Negative Supply Voltage. Supply range from -5.25V Input Crosspoint Input Crosspoint Shunt Input Crosspoint shunt capacitor ground connection improve off-isolation, additional input switch matrix FUNCTION
MAX4550/MAX4570
Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches MAX4550/MAX4570
Detailed Description
MAX4550/MAX4570 serial-interface, programmable, dual audio/video crosspoint switches. Each device contains independent crosspoint switches, controlled through on-chip serial interface. MAX4550 uses 2-wire I2C-compatible serial communications protocol, while MAX4570 uses 3-wire SPI/QSPI/MICROWIRE-compatible serial communications protocol. These include four controllable auxiliary outputs, each capable sourcing sinking 12mA. Also included four selectable bias-resistor networks (one each output) with AC-coupled input signals. Both devices operate with either dual supplies single supply, optimized audio frequency range 20kHz video frequencies 4MHz. They feature on-resistance, on-resistance matching between channels, onresistance flatness, 0.004% total harmonic distortion. MAX4550/MAX4570 offer better than -110dB audio off-isolation, -95dB audio crosstalk, -78dB video off-isolation, -54dB video crosstalk (4MHz). (shunt) inputs further improve off-isolation, allowing addition external shunt capacitors connection outputs grounds. These devices feature clickless operation mode noiseless audio switching. Clickless standard switching mode selectable each individual output using serial interface. logic position data byte makes that function active, while logic makes inactive. Tables describe command byte corresponding data byte. example, command byte set, subsequent data byte programs state auxiliary outputs. bits subsequent data byte set, outputs high. more than command byte set, data byte programs corresponding blocks. This operation useful, instance, simultaneously both switch matrices same configuration. block that selected command byte remains unchanged.
Table Command-Byte Format
Don't care Don't care BIAS/MODE COM2B COM1B COM2A COM1A REGISTER
Applications Information
MAX4550/MAX4570 divided into five functional blocks: control-logic block, switch-matrix blocks, bias-resistor block, auxiliary-output block (see Functional Diagram). control-logic block accepts commands serial interface uses those commands control four remaining blocks.
Table Data-Byte Format (C0, "1")
Don't care Don't care Don't care Controls switch connected close switch, open switch. Controls switch connected NO4_ close switch, open switch. Controls switch connected NO3_ close switch, open switch. Controls switch connected NO2_ close switch, open switch. Controls switch connected NO1_ close switch, open switch. DESCRIPTION
Command-Byte Data-Byte Programming
devices programmed through their serial interface with command byte followed data byte. Each command byte selects functional blocks controlled subsequent data byte. data byte sets state selected block(s). switch-matrix blocks, data byte sets switch state. bias-resistor block, data byte controls which bias network active. auxiliary-output block, data byte programs state four auxiliary outputs (see Functional Diagram).
Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches
Table AUX_ Data-Byte Format "1")
Don't care Don't care Don't care Don't care Controls output output high, output low. Controls output output high, output low. Controls output output high, output low. Controls output output high, output low. DESCRIPTION
2-wire serial interface requires only lines standard microprocessor port. Figures detail timing diagram signals 2-wire bus, Table details format signals. MAX4550 receive-only device must controlled master device. master device communicates transmitting address byte slave device over then transmitting desired information. Each transmission consists start condition, MAX4550's programmable slave-address byte, command-byte, data-byte, finally stop condition. slave device acknowledges recognition address pulling line clock period after address byte transmitted. slave device also issues similar acknowledgment after command byte again after data byte.
MAX4550/MAX4570
Table Clickless Mode/BIAS_ Data-Byte Format "1")
DESCRIPTION Controls COM2B clickless mode; enables clickless mode, disables clickless mode. Controls COM1B clickless mode; enables clickless mode, disables clickless mode. Controls COM2A clickless mode; enables clickless mode, disables clickless mode. Controls COM1A clickless mode; enables clickless mode, disables clickless mode. Controls COM2B bias resistors; connect bias resistors, disconnect bias resistors. Controls COM1B bias resistors; connect bias resistors, disconnect bias resistors. Controls COM2A bias resistors; connect bias resistors, disconnect bias resistors. Controls COM1A bias resistors; connect bias resistors, disconnect bias resistors.
Start Stop Conditions bus-master signals beginning transmission with start condition transitioning from high while high. When master finished communicating with slave, issues stop condition transitioning from high while high. then free another transmission. Slave Address (Address Byte) MAX4550 uses 8-bit-long slave address. select slave address, connect GND. MAX4550 four possible slave addresses, thus maximum four these devices share same 2-bit address bus. slave device (MAX4550) monitors serial continuously, waiting start condition followed address byte. When slave device recognizes address (10011A acknowledges that ready further communication pulling line while high.
3-Wire Serial Interface
MAX4570 3-wire serial interface SPI/ QSPI/MICROWIRE-compatible. active-low chipselect (CS) input enables device receive data from serial input (DIN). Data clocked rising edge serial-clock (SCLK) signal. total bits needed each write cycle. Segmented write cycles allowed (two 8-bit-wide transfers) remains low. first clocked into MAX4550 command byte's MSB, last clocked data byte's LSB. While shifting data, device remains original configuration. After bits clocked into input shift register, rising edge latches data into MAX4570 internal registers, initiating device's change state.
2-Wire Serial Interface
MAX4550 uses 2-wire, fast-mode, I2C-compatible serial interface. This protocol consists address byte followed command data bytes. address given chip, bits address byte must duplicate values present pins that chip. rest address bits control MAX4550 operation. command data-byte details described Command-Byte Data-Byte Programming section.
Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches MAX4550/MAX4570
Table 2-Wire Serial-Interface Data Format
ADDRESS BYTE COMMAND BYTE DATA BYTE
Don't care Start condition Acknowledge condition STOP Stop condition
STOP
Figure 2-Wire Serial-Interface Timing Diagram
tLOW
tHIGH
tSU:STA tHD:STA
tSU:DAT
tHD:DAT
tSU:STO tBUF
START CONDITION ADDRESS BYTE ADDRESS BYTE ACKNOWLEDGE CLOCKED INTO MASTER COMMAND BYTE
COMMAND BYTE ACKNOWLEDGE CLOCKED INTO MASTER DATA BYTE DATA BYTE ACKNOWLEDGE CLOCKED INTO MASTER
Figure 2-Wire Serial-Interface Timing Details
Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches
Figures Table show details 3-wire protocol, applies MAX4570. DOUT shift register's output. Data DOUT simply input data delayed clock cycles, with data appearing synchronous with SCLK's falling edge. Transitions SCLK have effect when high, DOUT holds last shift register.
Daisy Chaining program several MAX4570s, "daisy chain" devices connecting DOUT first device second, pins devices connected together, data shifted through MAX4570s series. bits data device required proper programming devices. When brought high, devices updated simultaneously.
MAX4550/MAX4570
SCLK COMMAND BYTE DATA BYTE
Figure 3-Wire Serial-Interface Communication
tCSH SCLK
tCSS
tCSH
DOUT
Figure 3-Wire Serial-Interface Timing Details
Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches MAX4550/MAX4570
Table 3-Wire Serial-Interface Data Format
COMMAND BYTE BIAS COM2B COM1B COM2A COM1A DATA BYTE
Don't care
Addressable Serial Interface program several MAX4570s individually using single processor, connect each MAX4570 together control each MAX4570 separately. select particular device, drive corresponding low, clock 16-bit command, then drive high execute command. Typically, only MAX4570 addressed time.
Using Auxiliary Outputs
four auxiliary outputs provide control external circuitry, such LEDs other loads, through serial interface. Program these outputs command byte. Each output capable sourcing sinking 12mA. They programmed through command byte data byte (refer Tables Functional Diagram).
Improving Off-Isolation
improve off-isolation, connect input ground either directly ground) through capacitors ground). Closing effectively grounds unused outputs.
Clickless Switching
Audible switching transients ("clicks") eliminated this mode operation. When output configured "clickless," gate signal switches connected that output controlled with slow-moving voltages. result, output slew rates significantly reduced. Program clickless operation command byte (refer Tables Functional Diagram). Each operating switch draw much during transition.
Using Internal Bias Resistors
internal bias-resistor networks give switch outputs bias when switch terminals coupled. Programming switches that connect bias resistors outputs accomplished command byte. Connect BIASH BIASL inputs levels (for example, GND), activate switch connecting appropriate output. This applies voltage midway between VBIASH VBIASL output (refer Tables Functional Diagram).
Power-Up State
MAX4550/MAX4570 feature preset power-up state. Upon power-up, COM1A COM2A connected COM1B COM2B connected outputs clickless mode, bias-resistor networks disconnected from outputs, auxiliary outputs low. other switches open.
Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches
Functional Diagram
MAX4550/MAX4570
NO1A NO2A NO3A NO4A
SWITCH MATRIX SWITCH MATRIX COM1B COM2B COM1A COM2A
MAX4550 MAX4570
NO1B NO2B NO3B NO4B
VGND
BIASH
SDA/(DIN) SCL/(SCLK) A0/(CS) A1/(DOUT)
CONTROL LOGIC BIAS RESISTOR NETWORK
BIASL
SWITCH STATES SHOWN POWER-UP STATE. AUXILIARY OUTPUTS POWER-UP STATE.
AUXILIARY OUTPUTS
MAX4570
Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches MAX4550/MAX4570
Package Information
SSOP.EPS
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 1998 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint

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