ONET2804TLP Datasheet, PDF (19/29 Pages) Texas Instruments – Low-Power, 28-Gbps, 4-Channel Limiting TIA

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7.6.7 Register 13: Amplitude and Rate for Channel 3 (address = 0Dh) [reset = 0h]
ONET2804TLP
SBAS796 – JULY 2017
7
RATE3
R/W-0h
6
RATE2
R/W-0h
Bit
Field
7-4
RATE[3:0]
3-0
AMP[3:0]
Figure 20. Register 13
5
RATE1
R/W-0h
4
RATE0
R/W-0h
3
AMP3
R/W-0h
2
AMP2
R/W-0h
1
AMP1
R/W-0h
Table 9. Register 13 Field Descriptions
Type
R/W
R/W
Reset
0h
0h
Description
Rate adjustments bits for channel 3.
0000 = 21 GHz (default)
0111 = BW decreases by approximately 0.4 GHz
1111 = BW increases by approximately 0.4 GHz
Amplitude adjustment bits for channel 3.
Table 5 lists the bit settings for AMP[3:0].
0
AMP0
R/W-0h
7.6.8 Register 14: Threshold and Gain for Channel 3 (address = 0Eh) [reset = 0h]
Figure 21. Register 14
7
PD
R/W-0h
6
DIS
R/W-0h
5
GAIN1
R/W-0h
4
GAIN0
R/W-0h
3
TH3
R/W-0h
2
TH2
R/W-0h
1
TH1
R/W-0h
0
TH0
R/W-0h
Bit
Field
7
PD
6
DIS
5-4
GAIN[1:0]
TH[3:0]
3-0
Table 10. Register 14 Field Descriptions
Type
R/W
R/W
R/W
R/W
Reset
0h
0h
0h
0h
Description
Power-down bit for channel 3.
1 = Power down channel 3
0 = Normal operation
Disable output buffer for channel 3.
1 = Disable channel 3 output buffer
0 = Normal operation
Gain adjustment bits for channel 3.
00 = Default
01 = Do not use
10 = Medium (–4 dB)
11 = Minimum (–8 dB)
Threshold adjustment bits for channel 3.
0000 = Zero shift
0001 = Minimum positive shift
0111 = Maximum positive shift
1000 = Zero shift
1001 = Minimum negative shift
1111 = Maximum negative shift
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