DS125BR800AEVM Datasheet, PDF (9/18 Pages) TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS – SMA evaluation kit provides a complete high band-width platform to evaluate the signal integrity

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Quick Start Guide
6. Set the output VOD and De-emphasis level.
• For external pin mode control for the VOD and De-emphasis level:
• Set ENSMB = 0 (1 kΩ to GND) by using the SW2 (3-2-1) = (ON-OFF-OFF).
• SW4 pin1,2 must be set to the OFF positions, so the SMBUS signals are disconnected.
• Refer to Table 1 for information on the 3 switch settings for the 4 level input.
Example:
• Set DEMB[1:0] with SW5 for the B bank of outputs (top 4 outputs of DS125BR800A).
• SW5 (6-5-4), (3-2-1) = (ON-OFF-OFF), (OFF-OFF-ON) = DEMB[1:0] = 0,1 (VOD=1.0V, DE=0 dB).
• Set DEMA[1:0] with SW3 for the A bank of outputs (bottom 4 outputs of DS125BR800A).
• SW3 (6-5-4), (3-2-1) = (ON-OFF-OFF), (OFF-OFF-ON) = DEMA1:0] = 0,1 (VOD=1.0V, DE=0 dB).
Level
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Table 5. DE and VOD Settings available in PIN MODE
EQA/B[1:0]
0, 0
0, R
0, F
0, 1
R, 0
R, R
R, F
R, 1
F, 0
F, R
F, F
F, 1
1, 0
1, R
1, F
1, 1
6
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
SW1 - EQB[1:0] or SW8 - EQA[1:0]
5
4
3
2
OFF
OFF
OFF
OFF
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
OFF
1
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
GEN1 and GEN2
Inner Amplitude
(V_PP)
0.8
DE (dB)
0
0.9
0
0.6
-3.5
1.0
0
0.7
-3.5
0.5
-6
1.1
0
0.7
-3.5
0.6
-6
1.2
0
0.8
-3.5
0.6
-6
1.3
0
0.9
-3.5
0.7
-6
0.5
-9
NOTE: The De-Emphasis levels are also available in SAS-3 / GEN-3 mode when MODE = 1
SNLU151 – September 2013
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DS125BR800AEVM Evaluation Kit
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