TECHNICAL NOTE

Audio Accessory ICs

Karaoke/Surround

Digital Echo

BU9253AS/FS, BU9262AFS

●Description

The Karaoke/Surround Digital Echo IC incorporates a digital delay circuit, an input/output mixing circuit, supporting Karaoke

echo and surround system, all in a single chip.

BU9253AS/FS has functions required by Karaoke echo system, and BU9262AFS has various functions required for

surround / echo system.

●Features

＜

BU9253AS/FS＞

2) Built-in mixing circuit for adding original sound and echo sound

3) Echo mix ratio settable by DC voltage

4) Built-in amplifier circuit for structuring input/output secondary LPF

5) Microphone mute function (mute of mixing sound of original sound + echo sound)

6) Built-in CR oscillation circuit

＜

BU9262AFS＞

1) Digital delay time : 8-stage setting from 9.2ms to 192ms

2) Built-in input/output mixing circuit

3) Built-in feedback, delay volume circuit

4) Built-in input/output LPF

5) Serial interface

6) Auto mute circuit built in (action at power on, mode switching)

7) Built-in auto reset circuit at power on

●Applications

Radio cassette recorder, mini-component and karaoke systems.

●Product lineup

Parameter

BU9253AS

BU9253FS

BU9262AFS

Supply voltage

4.0V～5.5V

4.0V～5.5V

4.5V～5.5V

Oscillation frequency

375kHz

375kHz

2MHz

Current consumption

6mA

6mA

20mA

Operating temperature range

-10～+70℃

-10～+70℃

-10～+70℃

Package

SDIP18

SSOP-A16

SSOP-A32

Digital delay

Fixed

Fixed

Variable

Echo level

Fixed

Fixed

Variable

Ver.B Oct.2005