ROHM BA3826S Datasheet

Audio ICs

Band-pass filter for spectrum analyzer

BA3826S

The BA3826S is a 7-band (2), band-pass filter that uses microprocessor time division to output in serial to left and right
stereo channels. To minimize the number of external components required and enable compact and reliable designs,
all of the capacitors for the filters are on the chip.

Applications
CD radio cassette players, mini-component stereo systems, car stereos

Features

1) Seven band-pass filter elements for spectrum ana­lyzer displays.

2) Microprocessor time division used for serial output
on L and R channels.

3) All filter capacitors are built-in to minimize external at­tached requirements.

Absolute maximum ratings (Ta = 25C)

4) Low current dissipation (8mA Typ.).

5) Ideal for mini-component stereos and other stereo
equipment.

Recommended operating conditions (Ta = 25C)

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Audio ICs BA3826S

Block diagram

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

CC = 5V, Vee = *5V, RL = 10kΩ, and Rφ = 120kΩ)

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Audio ICs BA3826S

Measurement circuit

Circuit operation

(1) Input switch circuit
The BA3826S alternately switches between the left and
right stereo channel signals using time division to serial­ize and process the signals.

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