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MAX9546ESA Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX9546ESA Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 12 page Differential Video Interface Chipset _______________________________________________________________________________________ 7 Detailed Description The MAX9546/MAX9547 differential interface chipset converts single-ended voltages to differential voltages for transport and then converts back to single-ended voltages. The chipset is optimized for transporting CVBS/FBAS analog video signals (PAL or NTSC) through hostile automotive environments. The MAX9546 driver includes a fault output (FAULT) that indicates shorted transmission cables. The MAX9547 receiver loss-of-signal output (LOS) indicates an absence of input signal. The MAX9546/MAX9547 operate from a 7.5V to 10V sin- gle supply. The differential interface is immune to short- circuit conditions to an automotive battery (VBAT = 16V), supply (VCC), or ground. These devices include ±15kV ESD (Human Body Model) protection. MAX9546 Driver The MAX9546 driver converts a single-ended video input into a differential output for transport across a twisted pair of wires. The input is AC-coupled and the video signal sync tip is clamped at 3.46V to set the voltage of the input. The output common-mode voltage is optimized to reject ground differences between the MAX9546 and MAX9547 up to ±2V. The differential gain is internally set to 2V/V to drive a back-terminated output to unity gain. The maximum input resistance should not exceed 400 Ω to ensure device stability. Pin Description (MAX9546) PIN NAME FUNCTION 1, 8 VCC Power Supply. Connect together and bypass with a 0.1µF in parallel with a 4.7µF capacitor to GND. 2 IN Video Input 3 FAULT Fault Indicator. Active-low, open-drain output. FAULT = low when fault is detected at the output. FAULT = high when no fault is detected at the output. 4, 5 GND Ground 6 OUT- Negative Differential Output 7 OUT+ Positive Differential Output EP EP Exposed Paddle. Connect to GND. Pin Description (MAX9547) PIN NAME FUNCTION 1 IN+ Positive Differential Input 2 ZT+ Positive Transconductance Terminal 3 ZT- Negative Transconductance Terminal 4 IN- Negative Differential Input 5 GND Ground 6 LOS Loss-of-Signal Indicator. Active-low, open-drain output. LOS = low when no signal is detected at the input. LOS = high when signal is present at the input. 7 IOUT Current Output 8VCC Power Supply. Bypass with a 0.1µF capacitor in parallel with a 4.7µF capacitor to GND. EP EP Exposed Paddle. Connect to GND. |
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