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GS1528

HD-LINX II Multi-Rate SDI Dual Slew-Rate Cable Driver

Gennum -> Semtech 

3.5 Output Amplitude Adjustment

The output amplitude of the GS1528 can be adjusted by changing the value of the RSET

resistor as shown in Figure 3-4 and Table 3-1. For an 800mVp-p output with a nominal

±7% tolerance, a value of 750Ω is required. A ±1% SMT resistor should be used.

1100

1000

900

800

700

600

500

600

700

800

RSET R (W)

900

1000

Figure 3-4: Output Amplitude Adjustment

The RSET resistor is part of the high-speed output circuit of the GS1528. 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 ground plane beneath the RSET

resistor and the RSET pin.

Table 3-1: RSET vs. VOD

RSET Resistance (Ω)

995

824

750

600

573

Output Swing

608

734

800

884

1040

NOTE: For reliable operation of the GS1528 over the full temperature range, do not use

an RSET value below 573Ω.

GS1528 HD-LINX II Multi-Rate SDI Dual Slew-Rate

Cable Driver

Data Sheet

16632 - 9

August 2010

10 of 13

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