TPL0401A-10_15 Datasheet, PDF (11/22 Pages) Texas Instruments – 128 TAPS Single Channel Digital Potentiometer with I2C Interface

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TYPICAL APPLICATION
1.5 V
TPL0401A
TPL0401B
TPL0401C
SLIS144A – SEPTEMBER 2011 – REVISED MARCH 2012
+
1 kW
VREF1
DDR3 DIMM1
_
1 kW
DPOT
TPL0401A/B
OP-AMP
LMV321
Figure 15. DDR3 Voltage Reference Adjustment
Below table shows Ideal values of resistance for a 10kΩ DPOT. The absolute values can vary significantly, but
the ratio (Rhw/Rwl) is extremely accurate.
Step
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Table 1. Resistance Values Table
Binary
0
1
10
11
100
101
110
111
1000
1001
1010
1011
1100
1101
1110
1111
10000
10001
10010
10011
10100
10101
10110
10111
11000
11001
11010
11011
11100
11101
11110
11111
Rwl (kΩ)
0.00
0.08
0.16
0.23
0.31
0.39
0.47
0.55
0.63
0.70
0.78
0.86
0.94
1.02
1.09
1.17
1.25
1.33
1.41
1.48
1.56
1.64
1.72
1.80
1.88
1.95
2.03
2.11
2.19
2.27
2.34
2.42
Rhw (kΩ)
10.00
9.92
9.84
9.77
9.69
9.61
9.53
9.45
9.38
9.30
9.22
9.14
9.06
8.98
8.91
8.83
8.75
8.67
8.59
8.52
8.44
8.36
8.28
8.20
8.13
8.05
7.97
7.89
7.81
7.73
7.66
7.58
Rhw/Rwl
0.00
0.01
0.02
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0.08
0.09
0.10
0.11
0.12
0.13
0.14
0.15
0.16
0.17
0.19
0.20
0.21
0.22
0.23
0.24
0.25
0.27
0.28
0.29
0.31
0.32
Copyright © 2011–2012, Texas Instruments Incorporated
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