ROHM BA1701 Datasheet

Audio ICs

VSC∗system processor IC

BA1701

The BA1701 is a monolithic audio-compression system controller IC that uses VSC∗.
When used in combination with an analog delay circuit and low-pass filter, it can replay recorded audio at 1 to 2.5 times
the recording speed, without altering the pitch.

Applications
Audio compression systems for tape-based answering machines and learning aids

Features

1) Wide operating voltage range (4.5V to 14V).

2) Built-in two-phase sweep oscillator that can directly
drive BBD.

3) Built-in motor controller is synchronized with the au­dio compression ratio.

4) Built-in voltage regulator.

Absolute maximum ratings (Ta = 25C)

Recommended operating conditions (Ta = 25C)

∗ VSC is a trademark of The Variable Speech Control Company . This product is manufactured under licence from VSC

Ltd. for use in VSC systems.

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Audio ICs BA1701

Block diagram

Electrical characteristics (unless otherwise noted, Ta = 25C, V

862

CC = 6V, f = 1kHz, and VIN = 1.5VP-P)

Audio ICs BA1701

Measurement circuit

863