BA3528AFP.PDF

Audio ICs

Pre / power amplifier and motor

governor for 3V headphone stereos

BA3528AFP / BA3529AFP

The BA3528AFP and AB3529AFP have been developed for headphone stereos. They run off a 3V power supply, and

include dual pre- and power amplifiers, and a motor governor.

The preamplifiers are direct-coupled, and the power amplifiers use a fixed-gain NF circuit. An on-chip V REF amplifier

makes output coupling capacitors unnecessary, and the motor governor uses a bridge ratio system to minimize the exter-

nal parts count and make reliable and compact designs possible.

Applications

3V portable stereo equipment

Features

1) All the functions required for headphone stereo units

on a single chip.

2) Preamplifier includes a mute amplifier.

3) Direct-coupled preamplifier.

4) No output coupling capacitors required for the power

amplifiers.

5) Power amplifiers do not require oscillation prevention

measures.

6) Power amplifier gain allows use of noise reduction

(BA3529AFP).

Absolute maximum ratings (Ta = 25C)

Recommended operating conditions (Ta = 25

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Audio ICs

BA3528AFP / BA3529AFP

Block diagram

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Audio ICs

BA3528AFP / BA3529AFP

Electrical characteristics (unless otherwise noted, Ta = 25

C, V CC = 3V, and f = 1kHz)

BA3528AFP

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Audio ICs

BA3528AFP / BA3529AFP

BA3529AFP

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Audio ICs

BA3528AFP / BA3529AFP

Measurement circuit

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