GS2984 Adaptive Cable Equalizer

Data Sheet

50985 - 3

March 2010

13 of 20

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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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.

NOTE:

See Section 2.2 for Output Common Mode Voltage specification.

Table 4-1: Mute Input Table

Mute

Function

0

SDO and SDO operate normally

1

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

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.

Table 4-4: CMSET Output Table

CMSET

Output Common Mode Voltage

Level

0

The output common mode will be

compatible with 3.3V CML

1

The output common mode will be

compatible with 2.5V CML