HT8955

更新时间： 2024-01-30 01:42:30

品牌	Logo	应用领域
台湾合泰/盛群 - HOLTEK		/
页数	文件大小	规格书
7页	591K
描述
Voice Echo

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技术参数
数据手册

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HT8955 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
包装说明：	DIP, DIP24,.6	Reach Compliance Code：	unknown
风险等级：	5.88	JESD-30 代码：	R-PDIP-T24
JESD-609代码：	e0	端子数量：	24
最高工作温度：	70 °C	最低工作温度：	-20 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	DIP
封装等效代码：	DIP24,.6	封装形状：	RECTANGULAR
封装形式：	IN-LINE	电源：	5 V
认证状态：	Not Qualified	子类别：	Audio Control ICs
最大压摆率：	8 mA	表面贴装：	NO
技术：	CMOS	温度等级：	COMMERCIAL
端子面层：	Tin/Lead (Sn/Pb)	端子形式：	THROUGH-HOLE
端子节距：	2.54 mm	端子位置：	DUAL
Base Number Matches：	1

HT8955 数据手册

HT8955A

Voice Echo

Features

•

Operating voltage: 5.0V

Long 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

•

–

0.8 seconds (SEL=VSS, 256K DRAM)

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

–

•

25kHz sampling rate

Continuous variable delay time

Applications

•

Mixers

Karaoke systems

Echo generators

Sound effect generators

•

General Description

The HT8955A is a CMOS LSI digita l audio

sign a l dela y pr ocessor. It is design ed for

a u dio syst em a pplica t ion s in clu din g ech o

gen er a t or s, ka r a oke system s, sou n d effect

generators, etc.

wh en com bin ed wit h a n ext er n a l 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.

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

Pin Assignment

Block Diagram

5th May ’98

12 3 4 5 6 7

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