399

Audio ICs

BA5415A / BA5416

FOperation notes

(1)

Input circuit

The structure of the input circuit is shown in Fig. 4. The

IC can be used without coupling capacitors, but a maxi-

mum of 0.5

pin, so if potentiometer sliding noise results from this,

To prevent degradation of the IC characteristics, the input

bias resistor is not built into the IC. Connect an input bias

mended value is about 33k

Ω).

(2)

Gain adjustment

The gain is given by the following formula.

amount of feedback will increase, and oscillation will be

more likely to occur. We recommend that you set the gain

to 30dB or higher.

(3)

Oscillation countermeasures

We recommend that the capacitor (C1) connected be-

tion be a metal-film component with good temperature

and high-frequency characteristics.

Ceramic capacitors have poor temperature characteris-

tics, so if used, allow sufficient oscillation margin. It is

also possible to connect a capacitor for oscillation pre-

vention between the output and GND (C2).

The oscillation margin depends on the PCB pattern and

the mounting position of the capacitor. Design your PCB

after referring to the application example PCB.

(4)

The Pre. GND and Pow. GND are joined at pin 12, so

there is a chance of crosstalk or degraded distortion per-

formance due to common ground impedance in the PCB

pattern. In addition, the power supply capacitor con-

grade the ripple rejection and distortion. Design the PCB

after referring to the application example PCB (the rec-

ommended value for the power supply capacitor is

1000

µF of greater).