591

Audio ICs

BA3574BFS

FOperation notes

(1)

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,

OUT 2, and Vref pins must have low impedance at high

frequency.

(2)

Wiring of PCB

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.

(3)

Recommended power supply voltage range

The curves in Fig. 5 below show the maximum allowable

y 3.6V, operate the IC in the region be-

low the dotted line, and do not exceed it.

If the maximum allowable power output for each channel

will exceed the power dissipation capacity of the pack-

age, and destroy the IC.

(4)

Switching noise prevention

Operate the BA3574BFS according to the timing dia-

gram given in Fig. 6 below to prevent a “pop” sound from

being output to the headphones.

(5)

BIAS OUT (pin 15)

The internal operating point voltage of the BA3574BFS

is supplied from BIAS OUT (pin 15). The current capacity

is limited, so do not use this as the operating point for ex-

ternal circuits.