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HT84192 Datasheet(PDF) 12 Page - Holtek Semiconductor Inc

Part # HT84192
Description  Magic VoiceTM
PDF  31 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT84192 Datasheet(HTML) 12 Page - Holtek Semiconductor Inc

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HT84XXX
12
April 26, 2000
The capability of the voice sampling rate for
various voice compression format.
fOSC
PCM8
m-law
PCM
AD4
4M
12kHz
11kHz
8kHz
5M
15kHz
14kHz
10kHz
6M
18kHz
16kHz
12kHz
8M
24kHz
22kHz
16kHz
Oscillator configuration
The HT84XXX series provides an RC oscillator
for the system clock. The system oscillator
stops in the standby state so as to reduce power
consumption.
For the oscillator circuit, an external resistor is
required between OSC and VSS. The oscillator
frequency is typically 4MHz for an external re-
sistor of 240kW. The RC type of oscillator offers
the most cost-effective solution, although the
frequency of the oscillation may vary with tem-
perature and the chip itself due to process vari-
ation.
ROSC
fOSC
HT84EVA HT84P00
IC
4M
180kW
240kW
240kW
5M
150kW
210kW
210kW
6M
120kW
180kW
180kW
8M
91kW
150kW
150kW
Mask options
The following options have to be defined to en-
sure a proper system functioning:
· Pull-high resistor: 33kW/98kW (3V)
· Keydebouncetime:0ms~255ms(fOSC=4MHz)



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