SM5902AF datasheet(30/40 Pages) NPC

30 / 40 page

Force mute

Soft mute

Soft mute operation is controlled by the SOFT flag

using a built-in attenuation counter.

Mute is ON when the SOFT flag is 1. When ON, the

attenuation counter output decrement by 1 step at a

time, thereby reducing the gain. Complete mute

takes 1024/fs (or approximately 23.2 ms for fs =

44.1 kHz).

Conversely, mute is released when the SOFT flag

is 0. In this case, the attenuation counter instanta-

neously increases. The attenuation register takes

on the value when the ATT flag was 1. If the ATT

flag was 0, the new set value is 256 (0 dB).

Fig 4. Soft mute operation example

256 step

/ 1024TS

SOFT

Attenation level

or full scale

− ∞

(Gain)

Serial output data is muted by setting the YDMUTE

pin input HIGH or by setting the MUTE flag to 1.

Mute starts and finishes on the leading left-channel

bit.

When MSON is HIGH and valid data is empty

(MSEMP=H), the output is automatically forced into

the mute state.

12-bit comparison connection

When the CMP12 flag is set to 1, the least signifi-

cant 4 bits of the 16-bit comparison connection

input data are discarded and comparison connec-

tion is performed using the remaining 12 bits.

Note that if the CMP12 flag is set to 1 during a com-

parison connection operation, only the most signifi-

cant 12 bits are used for comparison connection

from that point on.

NIPPON PRECISION CIRCUITS-30

SM5902AF

SM5902AF Datenblatt(PDF) 30 Page - Nippon Precision Circuits Inc