GS9077 Ver la hoja de datos (PDF) - Gennum -> Semtech

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GS9077

HD-LINX® III SD-SDI Cable Driver

Gennum -> Semtech 

GS9077 Data Sheet

4.2.1 Output Amplitude (RSET)

The output amplitude of the GS9077 can be adjusted by changing the value of the

RSET resistor as shown in Table 4-1. For an 800mVp-p output with a nominal ±7%

tolerance, a value of 750Ω is required. A ±1% SMT resistor should be used.

The RSET resistor is part of the high speed output circuit of the GS9077. The

resistor should be placed as close as possible to the RSET pin. In addition, the PCB

capacitance should be minimized at this node by removing the PCB groundplane

beneath the RSET resistor and the RSET pin.

Table 4-1: RSET vs VOD

RSET R (Ω)

Output Swing (mVp-p)

995

608

824

734

750

800

680

884

573

1040

NOTE: For reliable operation of the GS9077 over the full temperature range, do not use an RSET

value below 573Ω.

4.2.2 Output Disable

The serial output disable (DISABLE), disables power to the current mode serial

digital output driver. When asserted LOW, the SDO/SDO output driver is powered

off. SDO/SDO will float to VCC through the pull-up resistor.

4.3 Output Return Loss Measurement

To perform a practical return loss measurement, it is necessary to force the

GS9077 output to a DC high or low condition. The actual measured return loss will

be based on the outputs being static at VCC or VCC-1.6V. Under normal operating

conditions the outputs of the device swing between VCC-0.4V and VCC-1.2V.

44619 - 0 May 2007

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