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
R (W)
800
900
1000
R
SET
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)
Output Swing
995
824
750
600
573
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
10 of 13
Cable Driver
Data Sheet
16632 - 9
August 2010
GENNUM [ GENNUM CORPORATION ]
