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HT85048 датащи(PDF) 6 Page - Holtek Semiconductor Inc

номер детали HT85048
подробное описание детали  Green Voice
PDF  11 Pages
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производитель  HOLTEK [Holtek Semiconductor Inc]
домашняя страница  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT85048 датащи(HTML) 6 Page - Holtek Semiconductor Inc

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HT85XXX
6
August 24, 2000
PCM/ADPCM synthesizer
The HT85XXX family contains a PCM and
ADPCM synthesizer. The synthesizer offers a
wide range of sampling rates from 4kHz to
24kHz for PCM synthesis and 4kHz to 16kHz
for ADPCM synthesis. The sampling rate of the
synthesizer can be changed by writing a control
value to the sampling rate register. It also sup-
ports a small variety of 100Hz. For a higher
performance sound quality, the PCM coding is
required. But for a longer recording capacity,
the ADPCM coding is recommended.
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 HT85XXX 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)
· Key debounce time: 0ms~255ms (fOSC=4MHz)



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