371

Audio ICs

BA5152F

(3)

Bias block

The components connected to pins 2, 3, and 4 set the

Pins 3 and 4 are shorted and connected to earth via an

electrolytic capacitor to generate the bias point. When a

33

µF component is used, it is possible to obtain 45dB of

ripple rejection. This can be improved if pins are indepen-

dently grounded through capacitors.

(4)

Amplifier block

negative-feedback circuits are on the chip, and the

ground point of the negative-feedback circuit uses the

bias point as its reference, so connect the input poten-

tiometer to the bias point pins (3 and 4). Connect bypass

capacitors to the output pin to prevent oscillation. When

the IC is used in sets containing an AM radio, it is possible

to reduce unnecessary radiation from the power amplifi-

ers by connecting CR circuits to pins 6 and 11.

FElectrical characteristics curves (Ta = 25_C)