HT8955A Holtek, HT8955A Datasheet

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HT8955A

Manufacturer Part Number
HT8955A
Description
Voice echo
Manufacturer
Holtek
Datasheet

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Part Number:
HT8955A
Manufacturer:
TI
Quantity:
6 257
Features
Applications
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
Pin Assignment
Operating voltage: 5.0V
Long delay time
25kHz sampling rate
Continuous variable delay time
Mixers
Karaoke systems
0.8 seconds (SEL=VSS, 256K DRAM)
0.2 seconds (SEL=VDD/open, 64K DRAM)
1
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.
Block Diagram
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
Echo generators
Sound effect generators
Voice Echo
HT8955A
5th May ’98

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HT8955A Summary of contents

Page 1

... Continuous variable delay time Applications Mixers Karaoke systems General Description The HT8955A is a CMOS LSI digital audio signal delay processor 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 ...

Page 2

... VDD or Open: 64Kb VSS: 256Kb System oscillator input System oscillator output Delay time control oscillator input Delay time control oscillator output Negative power supply (GND) Connects to DRAM A6 Connects to DRAM A7 2 HT8955A Unit 896.00 811.00 645.00 810.50 435.00 794.00 335.00 794.00 150.00 779.00 – ...

Page 3

... Operating Temperature............... – Test Conditions Min. Typ. V Conditions DD — — 4.5 5.0 No load, 5V — 2.5 f =640kHz OSC R >100k L 5V — 2000 Open loop R >100k L 5V — 2000 Open loop — — 0 — 3 HT8955A (Ta=25 C) Max. Unit 5 — V/V — V/V 0. 5th May ’98 ...

Page 4

... Signal to Noise Ratio THD Total Harmonic Distortion Functional Description The HT8955A is a single chip LSI with an exter- nal DRAM designed for processing audio signal delay. The chip includes a built-in pre- amplifier, 10-bit A/D and D/A converters. The A/D and D/A converters ensure low distortion as well as high S/N ratio of the audio delay system ...

Page 5

... Application Circuits Low cost echo HT8955A 5 5th May ’98 ...

Page 6

... Basic KARAOKE system HT8955A 6 5th May ’98 ...

Page 7

... Basic KARAOKE system with pre-emphasis HT8955A 7 5th May ’98 ...

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