GS2984 Datasheet, PDF (13/20 Pages) Gennum Corporation – GS2984 Adaptive Cable Equalizer

Table 4-1: Mute Input Table
Mute
0
1
Function
SDO and SDO operate normally
SDO and SDO are forced to a steady
state (either high or low)
Table 4-2: CD Output Table
CD
Input Status
0
Valid Input on SDI, SDI pins
1
Input is not valid
4.6 GAIN_SEL
The GS2984 has an option of compensating for 6dB of flat attenuation in applications
where there has been some type of attenuation prior to the equalizer.
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Table 4-3: GAIN_SEL Input Table
GAIN_SEL Function
0
No flat band gain is applied
1
6dB of flat attenuation will be
compensated by the equalizer.
4.7 CMSET Operation
The GS2984 has a selectable output common mode level. This is useful when interfacing
to chips that can accept 2.5V input common mode levels. In these cases, AC coupling can
be avoided by selecting the correct output common mode.
Table 4-4: CMSET Output Table
CMSET
0
1
Output Common Mode Voltage
Level
The output common mode will be
compatible with 3.3V CML
The output common mode will be
compatible with 2.5V CML
NOTE: See Section 2.2 for Output Common Mode Voltage specification.
GS2984 Adaptive Cable Equalizer
Data Sheet
50985 - 3
March 2010
13 of 20