SM6451BV

NIPPON PRECISION CIRCUITS—8

D9, D8

Channel select bits. The selected channel(s) are shown in table 1.

D7 to D0

Attenuation register (ATT) set bits.

Table 1. Channel select

D 9

D 8

Selected channel

L O W

L O W

Both left and right channels

L O W

HIGH

Left channel

HIGH

L O W

Right channel

HIGH

HIGH

N o change

1.

Outputs are muted after system reset.

Attenuation error is changed dependent on the supply voltage when attenuation level is under – 60dB. In the case of the supply voltage being

under 2.6V, mute level inverses up to the same level of – 80dB setting or more. (see Figure 6)

Attenuation

D7

D6

D5

D4

D3

D2

D1

D0

0 dB

0 0

LO W

L O W

LO W

L O W

LO W

L O W

LO W

L O W

−1 dB

0 1

L O W

L O W

L O W

L O W

L O W

L O W

L O W

HIGH

−2 dB

0 2

L O W

L O W

L O W

L O W

L O W

L O W

HIGH

L O W

:

:::::::::

−15 dB

0 F

L O W

L O W

L O W

L O W

HIGH

HIGH

HIGH

HIGH

−16 dB

1 0

L O W

L O W

L O W

HIGH

L O W

L O W

L O W

L O W

−17 dB

1 1

L O W

L O W

L O W

HIGH

L O W

L O W

L O W

HIGH

:

:::::::::

−63 dB

3 F

L O W

L O W

HIGH

HIGH

HIGH

HIGH

HIGH

HIGH

−64 dB

4 0

L O W

HIGH

L O W

L O W

L O W

L O W

L O W

L O W

−65 dB

4 1

L O W

HIGH

L O W

L O W

L O W

L O W

L O W

HIGH

:

:::::::::

−79 dB

4 F

L O W

HIGH

L O W

L O W

HIGH

HIGH

HIGH

HIGH

−80 dB

5 0

L O W

HIGH

L O W

HIGH

L O W

L O W

L O W

L O W

Mute

51

L O W

HIGH

L O W

HIGH

L O W

L O W

L O W

HIGH

Mute

52

L O W

HIGH

L O W

HIGH

L O W

L O W

HIGH

L O W

:

:::::::::

Mute

F E

HIGH

HIGH

HIGH

HIGH

HIGH

HIGH

HIGH

L O W

Mute

F F

HIGH

HIGH

HIGH

HIGH

HIGH

HIGH

HIGH

HIGH