881

Audio ICs

BA3575FS

FApplication notes

(1)

“Pop” sound

By operating the BA3575FS according to the timing chart shown in Fig.3, it is possible to suppress generation of “pop”

noise in the headphone output.

(2)

Application circuits

Provided the recommended circuit constants are used,

the application circuits should function correctly. Howev-

er, we recommend that you confirm the characteristics of

the circuits in actual use. If you change the circuit

constants, check both the static and transient character-

istics of the circuit, and allow sufficient margin to accom-

modate variations between both ICs and external com-

ponents.

In particular, the capacitors connected to the OUT 1,

frequency, and have sufficient margin in their tempera-

ture characteristics.

Also, use an electrolytic or tantalum capacitor for the ca-

pacitor connected to the BIASOUT terminal.

(3)

The PCB pattern for the external components

should be designed carefully to prevent oscillation and

degradation of the circuit characteristics. Keep the wiring

tracks as short as possible, and ensure that there is no

impedance between the common connections.

The ripple filter pins (1 and 2) and the bias amplifier pins

(3 and 4) cannot be used for external power supplies or

reference voltages.