BA5152F Просмотр технического описания (PDF) - ROHM Semiconductor

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BA5152F

1.5V / 15mW dual power amplifier

ROHM Semiconductor 

Audio ICs

BA5152F

(3) Bias block

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

bias point and VODC. When pin 2 is open circuit, and VCC

= 1.25V, the output pin VODC voltage is internally set to

1 / 2VCC. By connecting a resistor to pin 2 and changing

the voltage divider ratio, it is possible to vary VODC.

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

electrolytic capacitor to generate the bias point. When a

33µF 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

The amplifier circuits have a fixed gain of GV = 21dB. The

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)

371

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