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Electronic Components Datasheet Search |
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HT8955 Datasheet(PDF) 1 Page - Holtek Semiconductor Inc |
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HT8955 Datasheet(HTML) 1 Page - Holtek Semiconductor Inc |
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1 / 7 page  HT8955A Voice Echo Pin Assignment Block Diagram 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. 1 5th May ’98 |
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