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MAX9547ESA+ Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX9547ESA+ Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 16 page Differential Video Interface Chipset 10 ______________________________________________________________________________________ Applications Information Differential Interface The impedances of the differential interface are made up of the two source resistors on the driver (MAX9546) shown as RS and the load resistors on the receiver (MAX9547) shown as RT in the Typical Application Circuit. These resistors are chosen so their sum match- es the characteristic impedance (Z0) of the differential transmission line. For example, a Category 5 cable has a characteristic impedance of 110Ω, so the sum of the two RS or RT resistors must be 110Ω to correctly drive the line. To balance the signals they must be equal, so RS and RT are 55Ω each. Using Other Transmitters and Receivers The MAX9546/MAX9547 are used with other transmit- ters and receivers; either other MAXIM devices or other brands entirely. The overall performance of the MAX9546/MAX9547 is dependent on the choice of the receiver or transmitter, respectively. Figure 2 illustrates one possible topology for the MAX9546 when using other devices with different offset requirements. Figures 3 and 4 illustrate two possible topologies for the MAX9547 when using other devices with unknown or different offset requirements. The cir- cuit shown in Figure 3 has a smaller PCB footprint at the expense of requiring higher DC offset currents from the source device. Figure 4 requires no DC offset cur- rents although it has a larger PCB footprint. When using the MAX9546 with AC-coupling capacitors, the FAULT signal will continue to function but only with respect to a DC short condition. The LOS signal from the MAX9547 is unaffected by coupling capacitors. Figure 2. Suggested MAX9546 Configuration for Use with Other Devices 0V OFFSET +3.2 VDC OFFSET +3.2 VDC OFFSET TO A DEVICE OTHER THAN A MAX9547 USING CAT5, ETC. VCC GND 1 4 IN D1 2 7 6 VCC 8 FAULT OUT+ OUT- 3 C4 0.33µF R1 3.92kΩ R4 75Ω R2 55Ω R3 55Ω C3 470µF C5 470µF GND 5 MAX9546 U1 4.7µF 0.1µF VDD |
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