HT8665 datasheet(1/13 Pages) HOLTEK

Part #	HT8665

Description	Talking Back with Echo

PDF	13 Pages

Scroll/Zoom	100%

Manufacturer	HOLTEK [Holtek Semiconductor Inc]

Direct Link	http://www.holtek.com

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HT8665

Talking Back with Echo

Features

•

Single power supply: 4.5V~5.5V

•

ADM algorithm

•

Auto playback with an echo effect

•

DRAM options:

–

64K

–

256K

•

Sampling rate options:

–

32K bps (bits per second)

–

16K bps

•

Recording capacity: 2, 4, 8, 16 seconds

•

A built-in 2 stage microphone amplifier

•

A built-in DRAM refresh circuit

•

A voltage type D/A output

•

A current type D/A output

•

Auto power-off

•

Low power dissipation

Applications

•

Toys

•

Educations

•

Games

General Description

The HT8665 is a single chip CMOS LSI using

an ADM algorithm. It is designed for applica-

tions on talking back with an echo effect. Func-

tions of the IC consist of recording/playing and

auto power off in addition to an echo effect. The

IC starts recording when a sound input is de-

tected, and stops to play back when silence lasts

0.5 seconds during recording. The auto power

off function is activated once a REC/PLAY cycle

has been implemented 64 times or an interval

of silence exceeds 2 minutes.

The HT8665 provides a recording capacity of 2

seconds at a 32K bps sampling rate for DRAM

of 64K (8 seconds for DRAM of 256K) and 4

seconds at a 16K bps sampling rate (16 seconds

for DRAM of 256Kb). A higher sampling rate

results in sounds of better quality but sacrifices

the recording time, and vice versa.

1

21st Dec ’95

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HT8665 Datasheet(PDF) 1 Page - Holtek Semiconductor Inc

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