GS3441 Datasheet, PDF (16/25 Pages) Semtech Corporation – Extended Reach 3G/HD/SD Adaptive Cable Equalizer with Dual Outputs

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 GS3441 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 OP1_CTL input pin determines the output swing and de-emphasis settings for the
first output (DDO1/DDO1), and OP2_CTL input pin determines the output swing and
de-emphasis settings for the second output (DDO2/DDO2).
The OP1_CTL and OP2_CTL pins are both analog inputs, allowing different
combinations of output swing, de-emphasis and mute. The possible values are listed in
Table 4-5 below:
Table 4-5: OP1_CTL and OP2_CTL Functions and Levels
Level
0
1
2
3
4
5
6
7
8
Swing (mV_ppd)
850mVpp_d
850mVpp_d
850mVpp_d
850mVpp_d
425mVpp_d
425mVpp_d
425mVpp_d
425mVpp_d
425mVpp_d
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
When muted, the output swing is set to 425mV_ppd and the outputs are latched.
GS3441 Extended Reach 3G/HD/SD Adaptive Cable
Equalizer with Dual Outputs
Final Data Sheet Rev. 1
GENDOC-056647 May 2013
www.semtech.com
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