DS125MB203_15 Datasheet, PDF (15/54 Pages) Texas Instruments – Low-Power 12.5-Gbps Dual-Lane 2:1/1:2 Mux/Buffer

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DS125MB203
SNLS432C – OCTOBER 2012 – REVISED DECEMBER 2015
Device Functional Modes (continued)
Table 2. Equalizer Settings
LEVEL
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
EQ_D1
EQ_S1
0
0
0
0
R
R
R
R
Float
Float
Float
Float
1
1
1
1
EQ_D0
EQ_S0
0
R
Float
1
0
R
Float
1
0
R
Float
1
0
R
Float
1
EQ – 8 BITS [7:0]
0000 0000 = 0x00
0000 0001 = 0x01
0000 0010 = 0x02
0000 0011 = 0x03
0000 0111 = 0x07
0001 0101 = 0x15
0000 1011 = 0x0B
0000 1111 = 0x0F
0101 0101 = 0x55
0001 1111 = 0x1F
0010 1111 = 0x2F
0011 1111 = 0x3F
1010 1010 = 0xAA
0111 1111 = 0x7F
1011 1111 = 0xBF
1111 1111 = 0xFF
dB AT
1.5 GHz
2.5
3.8
5.0
5.9
7.4
6.9
9.0
10.2
8.5
11.7
13.2
14.4
14.4
16.0
17.6
18.7
dB AT
2.5 GHz
3.5
5.4
7.0
8.0
10.3
10.2
12.4
13.8
12.6
16.2
18.3
19.8
20.5
22.2
24.4
25.8
dB AT
4 GHz
3.8
6.7
8.4
9.3
12.8
13.9
15.3
16.7
17.5
20.3
22.8
24.2
26.4
27.8
30.2
31.6
dB AT
6 GHz
3.1
6.7
8.4
9.1
13.7
16.2
15.9
17.0
20.7
21.8
23.6
24.7
28.0
29.2
30.9
31.9
SUGGESTED USE⁽¹⁾
FR4 < 5 inch trace
FR4 5 inch 5–mil trace
FR4 5 inch 4–mil trace
FR4 10 inch 5–mil trace
FR4 10 inch 4–mil trace
FR4 15 inch 4–mil trace
FR4 20 inch 4–mil trace
FR4 25 to 30 inch 4–mil trace
FR4 30 inch 4–mil trace
FR4 35-inch 4–mil trace
10-m, 30-awg cable
10-m – 12-m cable
(1) FR4 lengths are for reference only. FR4 lengths based on a 100-Ω differential stripline with 5-mil traces and 8-mil trace separation.
Table 3. De-Emphasis and Output Voltage Settings
LEVEL
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
DEM_D1
DEM_S1
0
0
0
0
R
R
R
R
Float
Float
Float
Float
1
1
1
1
DEM_D0
DEM_S0
0
R
Float
1
0
R
Float
1
0
R
Float
1
0
R
Float
1
VOD Vp-p
0.6
0.8
0.8
0.9
0.9
0.9
1.0
1.0
1.0
1.1
1.1
1.1
1.2
1.2
1.2
1.2
DEM dB
0
0
- 3.5
0
- 3.5
-6
0
- 3.5
-6
0
- 3.5
-6
0
- 3.5
-6
-9
INNER AMPLITUDE Vp-p
0.6
0.8
0.55
1.0
0.45
0.5
1.0
0.7
0.5
1.1
0.7
0.55
1.2
0.8
0.6
0.45
SUGGESTED USE⁽¹⁾
FR4 <5 inch 4–mil trace
FR4 <5 inch 4–mil trace
FR4 10 inch 4–mil trace
FR4 <5 inch 4–mil trace
FR4 10 inch 4–mil trace
FR4 15 inch 4–mil trace
FR4 <5 inch 4–mil trace
FR4 10 inch 4–mil trace
FR4 15 inch 4–mil trace
FR4 <5 inch 4–mil trace
FR4 10 inch 4–mil trace
FR4 15 inch 4–mil trace
FR4 <5 inch 4–mil trace
FR4 10 inch 4–mil trace
FR4 15 inch 4–mil trace
FR4 20 inch 4–mil trace
(1) The VOD output amplitude and DEM de-emphasis levels are set with the DEMD/S[1:0] pins.
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