HT8656B datasheet(1/11 Pages) HOLTEK

Part #	HT8656B

Description	Talking Back

PDF	11 Pages

Scroll/Zoom	100%

Manufacturer	HOLTEK [Holtek Semiconductor Inc]

Direct Link	http://www.holtek.com

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1 / 11 page

HT8656

Talking Back

Features

•

Operating voltage: 4.5V~5.5V

•

ADM algorithm

•

DRAM selection:

–

64K

–

256K

•

Sampling rate selection:

–

32Kb

–

16Kb

•

Auto stop recording

–

0.5 seconds silence is detected

–

Recording capacity is full

•

Built-in 2-stage microphone amplifier

•

Built-in DRAM refresh circuit

•

Voltage type D/A output

•

Current type D/A output

•

Auto record and playback

•

Auto power-off

•

Low power consumption

Applications

•

Toys

•

Education

•

Games

General Description

The HT8656 is a single chip CMOS LSI for

talking back applications using an ADM algo-

rithm. Functions of the IC consist of record-

ing/playing as well as auto power off. It starts

recording when a sound input is detected, and

stops to play back when silence lasts 0.5 sec-

onds during recording. The auto power off func-

tion is activated once a REC/PLAY cycle has

been implemented 64 times or an interval of

silence exceeds 2 minutes.

The HT8656 provides a recording capacity of 2

seconds for DRAM of 64K and 8 seconds for

DRAM of 256K at a 32Kb sampling rate and

double recording capacity at a 16Kb sampling

rate. A higher sampling rate will result in

sounds of better quality but sacrifice the record-

ing time, and vice versa.

1

5th May ’98

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HT8656B Datasheet(PDF) 1 Page - Holtek Semiconductor Inc

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