GS3440 Datasheet, PDF (15/23 Pages) Semtech Corporation – Extended Reach 3G/HD/SD Adaptive Cable Equalizer

Table 4-3: CD Output Table
CD
Input Status
0
Valid Input on SDI, SDI pins
1
Input is not valid
4.6 GAIN_SEL
The GS3440 has an option of compensating for 6dB of flat attenuation prior to the
equalizer.
Table 4-4: GAIN_SEL Input Table
GAIN_SEL Function
0
No flat band gain is applied.
1
6dB of flat attenuation will be
compensated by the device.
4.7 Adjustable Output Swing, De-Emphasis and Mute
The OP_CTL input pin determines the output swing and de-emphasis settings for DDO
and DDO.
The OP_CTL pin is an analog input, allowing different combinations of output swing,
de-emphasis and mute. The possible values are listed in Table 4-5.
Table 4-5: OP_CTL Functions and Levels
Level
0
1
2
3
4
5
6
7
8
Swing
850mV_ppd
850mV_ppd
850mV_ppd
850mV_ppd
425mV_ppd
425mV_ppd
425mV_ppd
425mV_ppd
425mV_ppd
De-emphasis
Off
2dB
4dB
6dB
Off
2dB
4dB
6dB
N/A
Mute
N
N
N
N
N
N
N
N
Y
Voltage (V)
0.000 - 0.083
0.234 - 0.394
0.545 - 0.704
0.856 - 1.015
1.166 - 1.333
1.484 - 1.644
1.795 - 1.954
2.106 - 2.265
2.416 - 2.500
GS3440 Adaptive Cable Equalizer
Final Data Sheet
Rev. 2
December 2012
15 of 23
Proprietary and Confidential