● 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＞
1) Digital delay time : 131ms (fCLK = 375kHz)
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.