HT8955A Holtek, HT8955A Datasheet
HT8955A
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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 ...
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... 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 – ...
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... 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 ...
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... 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 ...
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... Application Circuits Low cost echo HT8955A 5 5th May ’98 ...
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... Basic KARAOKE system HT8955A 6 5th May ’98 ...
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... Basic KARAOKE system with pre-emphasis HT8955A 7 5th May ’98 ...