SM6451A Datasheet, PDF (8/13 Pages) Nippon Precision Circuits Inc – Audio Variable Volume IC

SM6451A
D9, D8
Channel select bits. The selected channel(s) are shown in table 1.
Table 1. Channel select
D9
LOW
LOW
HIGH
HIGH
D8
LOW
HIGH
LOW
HIGH
Selected channel
Both left and right channels
Left channel
Right channel
No change
D7 to D0
Attenuation register (ATT) set bits.
Table 2. Attenuation setting
Attenuation
0 dB
−1 dB
−2 dB
:
−15 dB
−16 dB
−17 dB
:
−63 dB
−64 dB
−65 dB
:
−79 dB
−80 dB
Mute
Mute
:
Mute
Mute
ATT_H
00
01
02
:
0F
10
11
:
3F
40
41
:
4F
50
51
52
:
FE
FF
D7
LOW
LOW
LOW
:
LOW
LOW
LOW
:
LOW
LOW
LOW
:
LOW
LOW
LOW
LOW
:
HIGH
HIGH
D6
LOW
LOW
LOW
:
LOW
LOW
LOW
:
LOW
HIGH
HIGH
:
HIGH
HIGH
HIGH
HIGH
:
HIGH
HIGH
Note. Outputs are muted after system reset.
D5
LOW
LOW
LOW
:
LOW
LOW
LOW
:
HIGH
LOW
LOW
:
LOW
LOW
LOW
LOW
:
HIGH
HIGH
D4
LOW
LOW
LOW
:
LOW
HIGH
HIGH
:
HIGH
LOW
LOW
:
LOW
HIGH
HIGH
HIGH
:
HIGH
HIGH
D3
LOW
LOW
LOW
:
HIGH
LOW
LOW
:
HIGH
LOW
LOW
:
HIGH
LOW
LOW
LOW
:
HIGH
HIGH
D2
LOW
LOW
LOW
:
HIGH
LOW
LOW
:
HIGH
LOW
LOW
:
HIGH
LOW
LOW
LOW
:
HIGH
HIGH
D1
LOW
LOW
HIGH
:
HIGH
LOW
LOW
:
HIGH
LOW
LOW
:
HIGH
LOW
LOW
HIGH
:
HIGH
HIGH
D0
LOW
HIGH
LOW
:
HIGH
LOW
HIGH
:
HIGH
LOW
HIGH
:
HIGH
LOW
HIGH
LOW
:
LOW
HIGH
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