Datasheet
MCP454X/456X/464X/466X
DS22107B-page 70 2008-2013 Microchip Technology Inc.
TABLE 8-1: LINEAR TO LOG ATTENUATION FOR 8-BIT DIGITAL POTENTIOMETERS
# of
Steps
-3 dB Steps -2 dB Steps -1 dB Steps
Desired
Attenuation
Wiper
Code
Calculated
Attenuation
(1)
Desired
Attenuation
Wiper
Code
Calculated
Attenuation
(1)
Desired
Attenuation
Wiper
Code
Calculated
Attenuation
(1)
0 0 dB 256 0 dB 0 dB 256 0 dB 0 dB 256 0 dB
1 -3 dB 181 -3.011 dB -2 dB 203 -2.015 dB -1 dB 228 -1.006 dB
2 -6 dB 128 -6.021 dB -4 dB 162 -3.975 dB -2 dB 203 -2.015 dB
3-9dB91-8.984 dB -6 dB 128 -6.021 dB -3 dB 181 -3.011 dB
4 -12 dB 64 -12.041 dB -8 dB 102 -7.993 dB -4 dB 162 -3.975 dB
5 -15 dB 46 -14.910 dB -10 dB 81 -9.995 dB -5 dB 144 -4.998 dB
6 -18 dB 32 -18.062 dB -12 dB 64 -12.041 dB -6 dB 128 -6.021 dB
7 -21 dB 23 -20.930 dB -14 dB 51 -14.013 dB -7 dB 114 -7.027 dB
8 -24 dB 16 -24.082 dB -16 dB 41 -15.909 dB -8 dB 102 -7.993 dB
9 -27 dB 11 -27.337 dB -18 dB 32 -18.062 dB -9 dB 91 -8.984 dB
10 -30 dB 8 -30.103 dB -20 dB 26 -19.865 dB -10 dB 81 -9.995 dB
11 -33 dB 6 -32.602 dB -22 dB 20 -22.144 dB -11 dB 72 -11.018 dB
12 -36 dB 4 -36.124 dB -24 dB 16 -24.082 dB -12 dB 64 -12.041 dB
13 -39 dB 3 -38.622 dB -26 dB 13 -25.886 dB -13 dB 57 -13.047 dB
14 -42 dB 2 -42.144 dB -28 dB 10 -28.165 dB -14 dB 51 -14.013 dB
15 -48 dB 1 -48.165 dB -30 dB 8 -30.103 dB -15 dB 46 - 14.910 dB
16 Mute 0 Mute -32 dB 6 -32.602 dB -16 dB 41 -15.909 dB
17 -34 dB 5 -34.185 dB -17 dB 36 -17.039 dB
18 -36 dB 4 -36.124 dB -18 dB 32 -18.062 dB
19 -38 dB 3 -38.622 dB -19 dB 29 -18.917 dB
20 -42 dB 2 -42.144 dB -20 dB 26 -19.865 dB
21 -48 dB 1 -48.165 dB -21 dB 23 - 20.930 dB
22 Mute 0 Mute -22 dB 20 -22.144 dB
23 -23 dB 18 -23.059 dB
24 -24 dB 16 -24.082 dB
25 -25 dB 14 -25.242 dB
26 -26 dB 13 -25.886 dB
27 -27dB 11 -27.337 dB
28 -28 dB 10 -28.165 dB
29 -29 dB 9 -29.080 dB
30 -30 dB 8 -30.103 dB
31 -31 dB 7 -31.263 dB
32 -33 dB 6 -32.602 dB
33 -34 dB 5 -34.185 dB
34 -36 dB 4 -36.124 dB
35 -39 dB 3 -38.622 dB
36 -42 dB 2 -42.144 dB
37 -48 dB 1 -48.165 dB
38 Mute 0 Mute
Note 1:
Attenuation values do not include errors from Digital Potentiometer errors, such as Full Scale Error or Zero
Scale Error.