3.5 Output Amplitude Adjustment
The output amplitude of the GS1528 can be adjusted by changing the value of the R
SET
resistor as shown in
and
For an 800mV
p-p
output with a nominal
±7% tolerance, a value of 750Ω is required. A ±1% SMT resistor should be used.
1100
Output Swing (mV)
1000
900
800
700
600
500
600
700
800
900
1000
R
SET
R (W)
Figure 3-4: Output Amplitude Adjustment
The R
SET
resistor is part of the high-speed output circuit of the GS1528. The resistor
should be placed as close as possible to the R
SET
pin. In addition, the PCB capacitance
should be minimized at this node by removing the PCB ground plane beneath the R
SET
resistor and the R
SET
pin.
Table 3-1: R
SET
vs. V
OD
R
SET
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 R
SET
value below 573Ω.
GS1528 HD-LINX II Multi-Rate SDI Dual Slew-Rate
Cable Driver
Data Sheet
16632 - 9
August 2010
10 of 13
GENNUM [ GENNUM CORPORATION ]
