BA7787FS datasheet(19/24 Pages) ROHM

19 / 24 page

Multimedia ICs

BA7786FP-Y / BA7787FS

•Operation notes

(1) Popping noises occurring when the power is turned

• When the power is turned on, the headphone mute

function should be on and the suspend function off in

order to prevent popping noises from occurring when

VCC turns on.

(2) The supply voltages for HP VCC and SP VCC should

come from the same power supply. Using separate

power supplies can lead to output voltage drops and

malfunctioning.

(3) The common impedance of the two power supply

lines (HP VCC and SP VCC) should be kept as low as

possible.

(4) Make sure the input resistance for the SYSTEM

BEEP IN pin is 33k

Ω.

(5) Configure the PM BEEP IN pin of BA7786FP-Y as

shown below in order to prevent oscillation in the IC.

(6) The LCH OUT pin (pin 8) of BA7786FP-Y should be

grounded when not used.

(7) When switching the suspend function popping nois-

es may occur. If this bothers, take measures for elimi-

nating it by attachig external componets.

33k

BA7787FS Datasheet(PDF) 19 Page - Rohm