Time (6.46 ps/DIV)
Vo
lt
a
g
e
(
1
6
0
mV/
D
IV
)
Time (16.16 ps/DIV)
Vo
lt
a
g
e
(
1
4
0
mV/
D
IV
)
Example Hardware Test Setup
16
SNLU213A – October 2016 – Revised September 2019
Copyright © 2016–2019, Texas Instruments Incorporated
DS280MB810EVM User’s Guide
5.2
Equalizing High Pre-Channel Loss
The following is an example test setup configuration which demonstrates the DS280MB810 equalizing for
high pre-channel insertion loss introduced by an FR4 channel at 25.78125 Gbps and 10.3125 Gbps
Figure 15. 25.78125 Gbps CAUI-4 Eye Mask with 10in
Input Channel and Minimal Output Channel
Figure 16. 10.3125 Gbps nPPI Eye Mask with 10in Input
Channel and Minimal Output Channel
Table 5. Settings and Measurements for CAUI-4 and nPPI with 10in Input Channel and Minimal
Output Channel
25.78125 Gbps (CAUI-4)
10.3125 Gbps (nPPI)
Transmission Line 1
10 in 5 mil FR4 + 8in SMA cable
10 in 5 mil FR4 + 8 in SMA cable
DS280MB810 Rx Channel Loss
22 dB @ 12.9 GHz
(includes 4 dB from the EVM and
Huber+Suhner cable assembly)
10 dB @ 5.2 GHz
(includes 2 dB from the EVM and
Huber+Suhner cable assembly)
DS280MB810 Tx Channel Loss
4.5 dB @ 12.9 GHz
(includes 4 dB from the EVM and
Huber+Suhner cable assembly)
2 dB @ 5.2 GHz
(attributed to the EVM and Huber+Suhner
cable assembly)
EQ BST1
6
6
EQ BST2
1
1
EQ BW
3
3
VOD
3
2
EQ DC Gain Mode
Low
Low
Total Jitter @ 1E-15
11.3 ps
P-P
13.5 ps
P-P
Differential Eye Height @ 1E-15
210 mV
P-P
532 mV
P-P
Mask violations
0
0