Low-Voltage, High-Isolation, Dual 2-Channel RF/Video Multiplexer

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Low-Voltage, High-Isolation, Dual 2-Channel RF/Video Multiplexer

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Low-Voltage, High-Isolation, Dual 2-Channel RF/Video Multiplexer
MAX4589 low-voltage, dual 2-channel multiplexer designed video signal processing frequencies 200MHz systems. On-chip functions controlled through either parallel interface SPITM/QSPITM/MICROWIREserial interface. Each channel MAX4589 designed using switch configuration, ensuring excellent high-frequency off-isolation. MAX4589 on-resistance max, with on-resistance match across channels max. Additionally, on-resistance flat across specified signal range max). offleakage current under +25°C, less than 10nA +85°C. MAX4589 operates from single +2.7V +12V dual ±2.7V supplies. When operating with positive supply +5V, inputs maintain TTL/CMOSlevel compatibility. MAX4589 available 20-pin DIP, wide SSOP packages. High Off-Isolation: -74dB 10MHz Crosstalk: -70dB 10MHz 20MHz -0.1dB Signal Bandwidth 200MHz -3dB Signal Bandwidth (max) On-Resistance with Supplies (max) On-Resistance Matching with Supplies (max) On-Resistance Flatness with Supplies +2.7V +12V Single-Supply Operation ±2.7V Dual-Supply Operation Power Consumption: <20µW Rail-to-Rail®, Bidirectional Signal Handling Parallel SPI/QSPI/MICROWIRE-Compatible Serial Interface >±2kV Protection Method 3015.7 TTL/CMOS-Compatible Inputs with
Features
Insertion Loss: -2.5dB 100MHz
MAX4589
Applications
Switching Video Signal Routing High-Speed Data Acquisition Automatic Test Equipment Networking
Configuration
PART VIEW
COM1 CONTROL LOGIC LE/CS A1/SCLK A0/DOUT
Ordering Information
TEMP. RANGE +70°C +70°C +70°C -40°C +85°C -40°C +85°C -40°C +85°C PIN-PACKAGE SSOP Wide Plastic SSOP Wide Plastic MAX4589CAP
MAX4589
SER/PAR COM2
MAX4589CWP MAX4589CPP MAX4589EAP MAX4589EWP MAX4589EPP
SSOP/SO/DIP
QSPI trademarks Motorola, Inc. MICROWIRE trademark National Semiconductor Corp. Rail-to-Rail registered trademark Nippon Motorola, Ltd.
Maxim Integrated Products
free samples latest literature: http://www.maxim-ic.com, phone 1-800-998-8800. small orders, phone 1-800-835-8769.
Low-Voltage, High-Isolation, Dual 2-Channel RF/Video Multiplexer MAX4589
ABSOLUTE MAXIMUM RATINGS
(Voltages referenced GND) .-0.3V +13V .-0.3V 0.3V) (whichever lower) .-13V +0.3V V-.-0.3V +13V VNO_, VCOM_ (Note 1).(V- 0.3V) 0.3V) 2/4, A1/SCLK, A0/DOUT, DIN, SER/PAR .-0.3V 0.3V) Continuous Current into Terminal.±20mA Peak Current into Terminal (pulsed 1ms, duty cycle).±40mA Method 3015.7.±2kV Continuous Power Dissipation +70°C) SSOP (derate 9.1mW/°C above +70°C).727mW Wide (derate 10mW/°C above +70°C).800mW Plastic (derate 11.1mW/°C above +70°C) .889mW Operating Temperature Ranges MAX4589C_ .0°C +70°C MAX4589E_ .-40°C +85°C Storage Temperature Range .-65°C +150°C Lead Temperature (soldering, 10sec) .+300°C
Note Voltages these pins 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.
ELECTRICAL CHARACTERISTICS-Dual Supplies
+4.5V +5.5V, -4.5V -5.5V, VINH +2.4V, VINL +0.8V, TMIN TMAX, unless otherwise noted. Typical values +25°C, +5V, -5V.) (Note PARAMETER ANALOG SWITCH Analog Signal Range (Note On-Resistance On-Resistance Match Between Channels (Note On-Resistance Flatness (Note VCOM_, VNO_ -5V, VNO_ ±2V, ICOM_ VNO_ ±2V, ICOM_ -5V; VNO_= -1V; ICOM_ 5.5V, -5.5V, VCOM_ ±4.5V, VNO_ 4.5V 5.5V, -5.5V, VCOM_ ±4.5V, VNO_ 4.5V 5.5V, -5.5V, VCOM_ ±4.5V, VNO_ floating +25°C +25°C +25°C +25°C +25°C +25°C 0.01 0.01 0.01 SYMBOL CONDITIONS UNITS
RFLAT(ON)
Off-Leakage Current (Note
INO_ (OFF)
COM_ Off-Leakage Current (Note
ICOM_ (OFF)
COM_ On-Leakage Current (Note
ICOM_ (ON)
LOGIC INPUTS (2/4, LE/CS, A1/SCLK, AO/DOUT, DIN, SER/PAR) Input Logic Threshold High Input Logic Threshold Input Threshold Hysteresis Input Current VIN_ VINH VINL 0.03
Low-Voltage, High-Isolation, Dual 2-Channel RF/Video Multiplexer
ELECTRICAL CHARACTERISTICS-Dual Supplies (continued)
+4.5V +5.5V, -4.5V -5.5V, VINH +2.4V, VINL +0.8V, TMIN TMAX, unless otherwise noted. Typical values +25°C, +5V, -5V.) (Note PARAMETER DOUT Logic Output DOUT Logic High Output SYMBOL CONDITIONS ISINK 3.2mA ISOURCE -1mA VNO_ 4.5V, -4.5V, Figure VNO_ 4.5V, -4.5V, Figure VNO_ 5.5V, -5.5V, Figure 1.0nF, VNO_ Figure VNO_ 1MHz, Figure VCOM_ 1MHz, Figure VCOM_ 1MHz, Figure VNO_ 1VRMS, 10MHz, channels off, Figure VNO_ 1VRMS, 10MHz, Figure Figure Figure 2-channel mode 4-channel mode 2-channel mode 4-channel mode +25°C +25°C +25°C +25°C +25°C +25°C +25°C +25°C +25°C +25°C 6.25 UNITS LOGIC OUTPUT (SERIAL INTERFACE)
MAX4589
SWITCH DYNAMIC CHARACTERISTICS Turn-On Time Turn-Off Time Break-Before-Make Time Delay (Note Charge Injection Off-Capacitance COM_ Off-Capacitance COM_ On-Capacitance Off-Isolation (Note Channel-to-Channel Crosstalk -3dB Bandwidth -0.1dB Bandwidth PARALLEL-INTERFACE TIMING Rise Setup Time Rise Hold Time Pulse Width Pulse Width SERIAL-INTERFACE TIMING Operating Frequency SCLK Pulse Width High SCLK Pulse Width SCLK Rise Setup Time SCLK Rise Hold Time fCLK Figure Figure Figure Figure Figure Figure Figure Figure Figure tOFF tBBM CNO_(OFF) CCOM_(OFF) CCOM_(ON) VISO
Low-Voltage, High-Isolation, Dual 2-Channel RF/Video Multiplexer MAX4589
ELECTRICAL CHARACTERISTICS-Dual Supplies (continued)
+4.5V +5.5V, -4.5V -5.5V, VINH +2.4V, VINL +0.8V, TMIN TMAX, unless otherwise noted. Typical values +25°C, +5V, -5V.) (Note PARAMETER Fall SCLK Rise Setup Time Fall SCLK Rise Hold Time Rise SCLK Rise Hold Time Rise SCLK Rise Setup Time SCLK Rise DOUT Valid Pulse Width POWER SUPPLY Power-Supply Range Supply Current Supply Current Supply Current SYMBOL tCSS0 tCSS1 tCSH1 tCSS1 -5.5V, 5.5V -5.5V, 5.5V 5.5V, VIN_= +25°C +25°C Figure Figure Figure Figure 50pF, Figure Figure CONDITIONS ±2.7 +2.7 0.0001 0.0001 UNITS
ELECTRICAL CHARACTERISTICS-Single Supply
+4.5V +5.5V, VINH +2.4V, VINL +0.8V, TMIN TMAX, unless otherwise noted. Typical values +25°C, +5V.) (Note PARAMETER ANALOG SWITCH Analog Signal Range (Note On-Resistance On-Resistance Match Between Channels (Note On-Resistance Flatness (Note Off-Leakage Current (Notes COM_ Off-Leakage Current (Notes COM_ On-Leakage Current (Notes VCOM_, RFLAT(ON) INO_ (OFF) ICOM_ (OFF) ICOM_ (ON) VNO_ ICOM_ VNO_ ICOM_ ICOM_ 4mA; VNO_ 5.5V; VCOM_ 4.5V, VNO_ 4.5V 5.5V; VCOM_ 4.5V, VNO_ 4.5V 5.5V; VCOM_ 4.5V VNO_ 4.5V, floating +25°C +25°C +25°C +25°C +25°C +25°C 0.005 0.005 0.005 SYMBOL CONDITIONS UNITS
Low-Voltage, High-Isolation, Dual 2-Channel RF/Video Multiplexer
ELECTRICAL CHARACTERISTICS-Single Supply (continued)
+4.5V +5.5V, VINH +2.4V, VINL +0.8V, TMIN TMAX, unless otherwise noted. Typical values +25°C, +5V.) (Note PARAMETER Input Logic Threshold High Input Logic Threshold Input Threshold Hysteresis Input Current DOUT Logic Output DOUT Logic High Output ISINK 3.2mA ISOURCE -1mA VNO_ 4.5V, Figure VNO_ 4.5V, Figure VNO_ 5.5V, Figure 1.0nF, VNO_ 2.5V, Figure VNO_ 1VRMS, 10MHz, channels off, Figure VNO_ 1VRMS, 10MHz, Figure Figure Figure 2-channel mode 4-channel mode 2-channel mode 4-channel mode +25°C +25°C +25°C +25°C +25°C +25°C +25°C LOGIC OUTPUT (SERIAL INTERFACE) SYMBOL VINH VINL CONDITIONS UNITS LOGIC INPUTS (2/4, LE/CS, A1/SCLK, AO/DOUT, DIN, SER/PAR
MAX4589
SWITCH DYNAMIC CHARACTERISTICS Turn-On Time Turn-Off Time Break-Before-Make Time Delay (Note Charge Injection Off-Isolation Channel-to-Channel Crosstalk -3dB Bandwidth -0.1dB Bandwidth PARALLEL-INTERFACE TIMING Rise Setup Time Rise Hold Time Pulse Width Pulse Width Figure Figure Figure Figure tOFF tBBM VISO
Low-Voltage, High-Isolation, Dual 2-Channel RF/Video Multiplexer MAX4589
ELECTRICAL CHARACTERISTICS-Single Supply (continued)
+4.5V +5.5V, VINH +2.4V, VINL +0.8V, TMIN TMAX, unless otherwise noted. Typical values +25°C, +5V.) (Note PARAMETER SERIAL-INTERFACE TIMING Operating Frequency SCLK Pulse Width High SCLK Pulse Width SCLK Rise Setup Time SCLK Rise Hold Time Fall SCLK Rise Setup Time Rise SCLK Rise Hold Time Rise SCLK Rise Setup Time Fall SCLK Rise Hold Time SCLK Rise DOUT Valid Pulse Width POWER SUPPLY Power-Supply Range fCLK tCSS0 tCSH1 tCSS1 tCSS1 6.5V 6.5V 5.5V, 5.5V, VIN_ +25°C Figure Figure Figure Figure Figure Figure Figure Figure Figure 50pF, Figure Figure 6.25 SYMBOL CONDITIONS UNITS
Supply Current Supply Current
ELECTRICAL CHARACTERISTICS-Single Supply
+2.7V +3.6V, VINH +2V, VINL +0.5V, TMIN TMAX, unless otherwise noted. Typical values +25°C, +3V.) PARAMETER ANALOG SWITCH Analog Signal Range (Note On-Resistance VCOM_,VNO 2.7V, VNO_ ICOM_ +25°C VIN_ VNO_ 1.5V, 2.7V, Figure VNO_ 1.5V, 2.7V, Figure VNO_ 1.5V, 3.6V, Figure +25°C +25°C 1000 1200 SYMBOL CONDITIONS UNITS
LOGIC INPUT (2/4, LE/CS, A1/SCLK, AO/DOUT, DIN, SER/PAR Input Logic Threshold High Input Logic Threshold Input Current VINH VINL
SWITCH DYNAMIC CHARACTERISTICS Turn-On Time Turn-Off Time Break-Before-Make Time Delay (Note tOFF tBBM
Low-Voltage, High-Isolation, Dual 2-Channel RF/Video Multiplexer
ELECTRICAL CHARACTERISTICS-Single Supply (continued)
+2.7V +3.6V, VINH +2V, VINL +0.5V, TMIN TMAX, unless otherwise noted. Typical values +25°C, +3V.) PARAMETER PARALLEL-INTERFACE TIMING Rise Setup Time Rise Hold Time Pulse Width Pulse Width SERIAL-INTERFACE TIMING Operating Frequency SCLK Pulse Width High SCLK Pulse Width SCLK Rise Setup Time SCLK Rise Hold Time Fall SCLK Rise Setup Time Rise SCLK Rise Hold Time Rise SCLK Rise Setup Time Fall SCLK Rise Hold Time SCLK Rise DOUT Valid Pulse Width POWER SUPPLY Supply Current Supply Current Note Note Note Note fCLK tCSS0 tCSH1 tCSS1 tCSS1 Figure Figure Figure Figure Figure Figure Figure Figure Figure 50pF, Figure Figure +25°C Figure Figure Figure Figure SYMBOL CONDITIONS UNITS
MAX4589
3.6V, 3.6V,
algebraic convention used this data sheet; most negative value shown minimum column. Guaranteed design. RON(MAX) RON(MIN). Resistance flatness defined difference between maximum minimum value on-resistance measured over specified analog-signal range. Note Leakage parameters 100% tested maximum rated temperature guaranteed correlation +25°C. Note Off-isolation 20log10 [VCOM_ VNO_], VCOM_ output, VNO_ input switch. Note Leakage testing single-supply operation guaranteed testing with dual supplies.
Low-Voltage, High-Isolation, Dual 2-Channel RF/Video Multiplexer MAX4589
Typical Operating Characteristics
+5V, -5V, +25°C, unless otherwise specified.)
ON-RESISTANCE VCOM (SINGLE SUPPLY)
MAX4589toc01 MAX4589toc02
ON-RESISTANCE VCOM (DUAL SUPPLIES)
VCOM ±2.5V
ON-RESISTANCE VCOM TEMPERATURE (DUAL SUPPLIES)
MAX4589toc03
+85°C +25°C -40°C
+2.5V
+3.0V +3.6V
+12V
VCOM
VCOM
ON-RESISTANCE VCOM TEMPERATURE (SINGLE SUPPLY)
MAX4589toc04
ON/OFF-LEAKAGE CURRENT TEMPERATURE
MAX4589toc05
CHARGE INJECTION VCOM
CHARGE INJECTION (pC) SINGLE SUPPLY DUAL SUPPLIES
MAX4589toc06
+85°C +25°C -40°C
LEAKAGE CURRENT (pA)
ON-LEAKAGE
OFF-LEAKAGE
VCOM TEMPERATURE (°C)
VCOM
tON, tOFF SUPPLY VOLTAGE
MAX4589toc07
tON, tOFF TEMPERATURE
CURRENT
MAX4589toc08
POWER-SUPPLY CURRENT TEMPERATURE
100n 100p 0.1p IMAX4589toc09
TIME (ns) tOFF
TIME (ns)
tOFF
DUAL SUPPLY VOLTAGE (±V)
TEMPERATURE (°C)
TEMPERATURE (°C)
Low-Voltage, High-Isolation, Dual 2-Channel RF/Video Multiplexer
Typical Operating Characteristics (continued)
+5V, -5V, +25°C, unless otherwise specified.)
INSERTION LOSS, OFF-ISOLATION, CROSSTALK FREQUENCY (DUAL SUPPLIES)
MAX4589toc11
MAX4589
INSERTION LOSS, OFF-ISOLATION, CROSSTALK FREQUENCY (SINGLE SUPPLY)
AMPLITUDE (dB) CROSSTALK INSERTION LOSS
MAX4589toc12
AMPLITUDE (dB) 100k FREQUENCY (Hz) 100M OFF-ISOLATION CROSSTALK LOSS
100k FREQUENCY (MHz) 100M OFF-ISOLATION
Low-Voltage, High-Isolation, Dual 2-Channel RF/Video Multiplexer MAX4589
Description
NAME COM1 FUNCTION Ground. Connect ground plane. Grounding section. Analog Switch Common Terminal. Truth Tables. Analog Positive Supply Voltage Input Normally Open Analog Input Terminal. Truth Tables. Normally Open Analog Input Terminal. Truth Tables. Multiplexer Configuration Control. Connect select dual 2-channel mode. Connect single 4-channel multiplexer operation. Truth Tables. Active-Low Reset Input. serial mode, drive force latches shift registers power-on reset state force switches open. parallel mode, drive force latches power-on reset state force switches open. Truth Tables. parallel mode this transparent Latch Enable. serial mode, this Chip-Select input. Truth Tables. parallel mode, A1/SCLK most significant address bit. high, A1/SCLK ignored. serial mode, A1/SCLK serial shift clock input. Data loaded rising edge SCLK. Truth Tables. parallel mode, this least significant address bit. serial mode, DOUT output from internal 4-bit shift register. DOUT intended daisy-chain cascading. DOUT three-stated Serial Operation. Switch Enable. Drive force channels off. Drive high allow normal multiplexer operation. Operates asynchronously serial mode. parallel mode, latched when signal high. Serial Data Input. serial mode, data loaded rising edge SCLK. Connect parallel mode. Logic Supply Input. Powers DOUT driver other digital circuitry. sets both input threshold levels output logic levels. Normally Open Analog Input Terminal. Truth Tables. Normally Open Analog Input Terminal. Truth Tables. Analog Negative Supply Voltage Input. Connect single-supply operation. Analog Switch Common Terminal. Truth Tables. Interface Select Input. Drive parallel data interface operation. Drive high serial data interface operation enable DOUT driver.
LE/CS A1/SCLK
A0/DOUT
VCOM2 SER/PAR
Low-Voltage, High-Isolation, Dual 2-Channel RF/Video Multiplexer MAX4589
LE/CS
VNO_
MAX4589
COM_ VVSWITCH TIMED FROM LEVEL DIGITAL SIGNAL. VOUT 30pF VOUT
tOFF
Figure Turn-On/Turn-Off Time
LE/CS SER/PAR VNO_
MAX4589
COM_ VVGND VOUT 30pF
VOUT
tBBM
Figure Break-Before-Make Time Delay
LE/CS SER/PAR 10µF VNO_
MAX4589
COM_ VOUT VOUT MEASURED VOLTAGE CHARGE TRANSFER ERROR WHEN CHANNEL TURNS OFF. VOUT VOUT VOUT
Figure Charge Injection
Low-Voltage, High-Isolation, Dual 2-Channel RF/Video Multiplexer MAX4589
FLOATING 1MHz CAPACITANCE ANALYZER
MAX4589
COM_ VV1MHz CAPACITANCE ANALYZER
MAX4589
COM_
FLOATING
Figure NO_, COM_ Capacitance
49.9
MAX4589
24.9
MEASURE NODE
COM_
MEASURE NODE
SIGNALS NORMALIZED VCOM 0dB.
Figure Off-Isolation, Crosstalk, Bandwidth
MAX4589
NOTE: INPUT SIGNALS SPECIFIED WITH <10ns. TIMING MEASURED FROM DIGITAL SIGNAL.
Figure Parallel Timing Diagram
Low-Voltage, High-Isolation, Dual 2-Channel RF/Video Multiplexer MAX4589
tCSS
tCSH
MAX4589
SCLK
DISABLE
DOUT
NOTE: INPUT SIGNALS SPECIFIED WITH 10ns. TIMING MEASURED FROM DIGITAL SIGNAL.
Figure Serial Timing Diagram
_Detailed Description
Logic-Level Translators
MAX4589 constructed high-frequency switches, shown Figure logic-level inputs translated amplifier into logic signal that drives internal control logic. internal control logic drives gates N-channel MOSFETs from turning them fully off. same signal drives inverter (which drives Pchannel MOSFETs turning them fully off) from turns N-channel MOSFET off. logic-level threshold determined GND.
Frequency response systems reasonably flat 50MHz, with typically 2.5dB insertion loss. Higher-impedance circuits show even lower attenuation (and vice versa), slightly lower bandwidth increased effect internal external capacitance switch's on-resistance. MAX4589 optimized operation. Using lower supply voltages single supply increases switching time, on-resistance (and therefore on-state attenuation), nonlinearity.
Switch Condition
When switch off, MOSFETs MOSFET (Figure signal path through parasitic off-capacitances shunted ground This forms highpass filter whose exact characteristics dependent source load impedances. systems, below 1MHz, attenuation exceeds 80dB. This value decreases with increasing frequency increasing circuit impedances. External capacitance board layout dominate overall performance.
Switch Condition
When switch MOSFETs MOSFET (Figure signal path COM_ NO_, because both N-channel P-channel MOSFETs pure resistances, symmetrical (i.e., signals pass either direction). MOSFET, conduction, small amount capacitance GND. MAX4589's construction allows exceptional 200MHz -3dB bandwidth.
Low-Voltage, High-Isolation, Dual 2-Channel RF/Video Multiplexer MAX4589
COM_
CONTROL LOGIC
Figure T-Switch Construction
_Applications Information
Power-Supply Considerations
Overview MAX4589 construction typical many CMOS analog switches. four supply pins: GND. used drive internal CMOS switches limits analog voltage switch. Reverse ESD-protection diodes internally connected between each analog signal both voltage exceeds these diodes conducts. During normal operation these reverse-biased diodes leak, forming only current drawn from Virtually analog leakage current through diodes. Although diodes given signal identical, therefore fairly well balanced, they reverse-biased differently. Each biased either analog signal. This means their leakages vary signal varies. difference diode leakages from signal path pins constitutes analog signal-path leakage current. analog leakage current flows supply terminals, other switch terminal. This explains both sides given switch show leakage currents either same opposite polarity.
There connection between analog signal paths GND. analog signal paths consist
N-channel P-channel MOSFET with their sources drains paralleled their gates driven phase logic-level translators. power internal logic logic-level translators, input logic thresholds. logic-level translators convert logic levels switched signals drive gates analog switches. Therefore, gate-to-source gate-to-drain impedances only connection between logic supplies analog supplies.
Bipolar-Supply Operation MAX4589 operates with bipolar supplies between ±2.7V ±6V. supplies required symmetrical, their cannot exceed absolute maximum rating 13.0V. connect MAX4589 connect logic-level input pins logic-level signals. This exceeds absolute maximum ratings, cause damage part and/or external circuits. CAUTION: absolute maximum differential voltage 13.0V. Typical "±6-Volt" "12-Volt" supplies with ±10% tolerances high 13.2V. This voltage damage MAX4589. Even tolerance supplies have overshoot noise spikes that exceed 13.0V.
Low-Voltage, High-Isolation, Dual 2-Channel RF/Video Multiplexer
Single-Supply Operation MAX4589 operates from single supply between +2.7V +12V when connected GND. Observe precautions listed BipolarSupply Operation section. Note, however, that these parts optimized operation, characteristics degraded significantly when operating less than ±5V. overall supply voltage reduced, switching speed, on-resistance, off-isolation, distortion degraded (see Typical Operating Characteristics). Single-supply operation also limits signal levels interferes with grounded signals. When GND, signals limited 300mV below GND. Voltages below this level clipped internal ESD-protection diodes, parts damaged excessive current flows. Power When power MAX4589 (i.e., Absolute Maximum Ratings still apply. This means that none MAX4589 pins exceed ±0.3V. Voltages beyond ±0.3V cause internal ESDprotection diodes conduct, with potentially catastrophic consequences. Power-Supply Sequencing When applying power MAX4589, follow this sequence: then logic inputs. Apply signals analog COM_ pins time after set. Turning pins simultaneously acceptable only circuit design guarantees concurrent power-up.
power-down sequence opposite power-up sequence. That logic inputs must zero potential before simultaneously with) then supplies. Always observe Absolute Maximum Ratings ensure proper operation. threshold.) With threshold about 1.6V, ensuring compatibility with TTL- CMOSlogic drivers.
MAX4589
Ground Bypassing
ground plane mandatory satisfactory highfrequency operation. Prototyping using hand wiring wire-wrap boards recommended. Make ground plane solid metal underneath device, without interruptions. Avoid routing traces under device itself. packages, this applies both sides two-sided board. Failure observe this minimal effect "on" characteristics switch high frequencies, will degrade off-isolation crosstalk. When using package MAX4589 boards with buried ground plane, connect pins ground plane with separate via. share this with other ground path. Providing ground both sides land further enhances off-isolation lowering parasitic inductance. With package, connect through-holes directly buried plane thermally relieve them, required, meet manufacturability requirements. Again, these through-hole pads current path other components. Bypass pins ground plane with surface-mount 0.1µF capacitors. Locate these capacitors close possible pins same side board device. feedthroughs vias bypass capacitors. board layout dictates that bypass capacitors mounted opposite side board, short feedthroughs vias, directly under pins. multiple vias possible. GND, connect directly ground plane with solid copper. Keep traces short.
Signal Routing
Keep signal traces short possible. Separate signal traces from each other, keep them away from other traces that could induce interference. Separating signal traces with generously sized ground wires also helps minimize interference. Routing signals coaxial cable, terminated close MAX4589 possible, provides highest isolation.
Grounding
Ground Considerations Satisfactory high-frequency operation requires that careful consideration given grounding. most applications, ground plane strongly recommended must connect with solid copper. While power-supply pins common switches given package, each input pair separated with ground pins that internally connected each other. This contributes overall high-frequency performance reducing channel-to-channel crosstalk. digital inputs have voltage thresholds determined GND. does influence logic-level
Board Layout
sockets degrade high-frequency performance recommended signal bandwidth exceeds 5MHz. Surface-mount parts, having shorter internal lead frames, provide best high-frequency performance. Keep bypass capacitors close device, separate signal leads with ground planes.
Low-Voltage, High-Isolation, Dual 2-Channel RF/Video Multiplexer MAX4589
vias connect ground planes each side board. Logic-level signal routing critical.
Impedance Matching
MAX4589 intended systems, where inputs terminated external terminals connected impedance higher. MAX4589 operates systems with terminations through However, variations on-resistance on-resistance flatness cause nonlinearities.
Crosstalk Off-Isolation
graphs shown Typical Operating Characteristics crosstalk off-isolation taken adjacent channels. adjacent channel worst-case condition. example, worst off-isolation COM1 close proximity. Choosing channels wisely necessitates separating most sensitive channels from most offensive. Conversely, above information also applies inputs COM2 pin.
4-bit SPI/MICROWIRE write operation. Systems that must write longer data streams ignore last four bits. Refer Figure detailed diagram serial-interface logic. first loaded then then unused bit, followed disable bit. There four flip-flops input shift register. output shift register output DOUT rising edge A1/SCLK. This allows cascading multiple MAX4589s using only chip-select line. example, 16-bit write programs shift registers four cascaded MAX4589s. data from shift register moved internal control latches only upon rising edge four MAX4589s change state simultaneously. same effect internal power-on reset (POR) signal. state disable serial mode, used. Connect leave unconnected.
Parallel Operation
parallel mode activated driving SER/PAR logic low. MAX4589 then programmed latched parallel scheme. Refer Figure detailed diagram parallel-interface logic. high, disabled MAX4589 configured dual 1-of-2 multiplexer. low, MAX4589 configured 1-of-4 multiplexer. best hard-wire known state desired mode operation, dedicated microcontroller port pin.
Power-On Reset (POR)
MAX4589 internal circuitry guarantee that switches power-up (POR). This equivalent state resulting from asserting during normal operation.
Serial Operation
serial mode activated driving SER/PAR input logic high. data then entered using
Low-Voltage, High-Isolation, Dual 2-Channel RF/Video Multiplexer
Truth Tables
Parallel Operation
SER/PAR SWITCH STATES Maintain previous state. switches off, latches cleared. Serial Mode. Refer Serial Operation Truth Table. switches off. Connect COM1 Connect COM1 Connect COM2 Connect COM2 Connect COM1and COM2 Connect COM1and COM2
MAX4589
Don't Care. Note: latched when high. When low, latches transparent. latched. Connect COM1 COM2 externally 1-of-4 single-ended operation.
Serial Operation
SER/PAR SCLK DOUT High-Z SWITCH STATES switches off, latches shift register cleared. This Power-On Reset (POR) state. Parallel Mode. Refer Parallel Operation Truth Table. switches off. Chip unselected. Input shift register loads from DIN. DOUT updates rising edge SCLK. Contents shift register transferred control latches.
Don't Care. *DOUT delayed clock cycles from DIN.
Low-Voltage, High-Isolation, Dual 2-Channel RF/Video Multiplexer MAX4589
Truth Tables (continued)
Control Logic
DISABLE switches off. Connects COM1 Connects COM1 Connects COM2 Connects COM2 Connects COM1 COM2 Connects COM1 COM2 SWITCH STATES
Don't Care. Note: DISABLE bits latched into MAX4589 with MICROWIRE/SPI write, respectively. (first clocked in), used, DISABLE (last clocked in).
_Chip Information
TRANSISTOR COUNT:
Low-Voltage, High-Isolation, Dual 2-Channel RF/Video Multiplexer
Package Information
SSOP.EPS
MAX4589
PDIPN.EPS
Low-Voltage, High-Isolation, Dual 2-Channel RF/Video Multiplexer MAX4589
Package Information (continued)
SOICW.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 1999 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

Low-Voltage, High-Isolation, Dual 2-Channel RF/Video Multiplexer

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