HT8955A 데이터 시트보기 (PDF) - Holtek Semiconductor

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HT8955A

Voice Echo

Holtek Semiconductor 

HT8955A

Voice Echo

Features

• Operating voltage: 5.0V

• Long delay time

– 0.8 seconds (SEL=VSS, 256K DRAM)

– 0.2 seconds (SEL=VDD/open, 64K DRAM)

• 25kHz sampling rate

• Continuous variable delay time

• Built-in pre-amplifier

• Low distortion

• High S/N ratio

• Wide frequency response

• PCM 10-bit A/D and D/A converters

• 24-pin DIP package

Applications

• Mixers

• Karaoke systems

• Echo generators

• Sound effect generators

General Description

The HT8955A is a CMOS LSI digital audio

signal delay processor. It is designed for

audio system applications including echo

generators, karaoke systems, sound effect

generators, etc.

The chip consists of a built-in pre-amplifier,

on-chip oscillator, DRAM interface, 10-bit A/D

and D/A converters as well as control logic. It

provides continuously adjustable delay time up

to 0.8/0.2 seconds at a sampling rate of 25kHz

when combined with an external DRAM

(41256/4164). The HT8955A is superior to a

conventional BBD delay unit in its low distor-

tion, high S/N ratio and long delay time. Its

sophisticated low pass filter will not end in the

normal applications due to the high sampling

rate (25~50kHz). Hence, the HT8955A is excel-

lent for audio delay system applications. It is

offered in a 24-pin dual-in-line package.

Pin Assignment

Block Diagram

1

5th May ’98

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