560

Audio ICs

BA3570F / BA3570FS

FExplanation of ALS operation and attached compo-

nents

(1)

ALS system control circuit

The ALS system control circuit is shown in Fig. 9.

S ALS mode switching table

S ALS SW τ external connection value: C13

By increasing the capacitance of C13, the switching

sound made when ALS is turned on or off can be re-

duced, however, the switching time will increase. Set the

value appropriately for the application.

S ALSτ external connection value: C14

The ALC attack and recovery time for ALS is determined

by C14 connected to the

τ pin (Pin 9).

FMute amplifier (pin numbers are for 22-pin BA3570F)

The output muting can be switched on or off.

FMute switching table

FMUTE SWτ external connection value: C8

By increasing the capacitance of C8, the switching

sound made when the mute is turned on or off can be

reduced, however, the switching time will increase. Set

the value appropriately for the application.