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HT9170 Datasheet(PDF) 1 Page - Holtek Semiconductor Inc

Part # HT9170
Description  DTMF Receiver
PDF  12 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT9170 Datasheet(HTML) 1 Page - Holtek Semiconductor Inc

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HT9170
DTMF Receiver
Selection Table
Function Operating
Voltage
OSC
Frequency
Tristate
Data Output
Power
Down
1633Hz
Inhibit DV DVB Package
Part No.
HT9170B 2.5V~5.5V
3.58MHz
ÖÖ
Ö
Ö
¾
18 DIP
HT9170D 2.5V~5.5V
3.58MHz
ÖÖ
Ö
Ö
¾
18 SOP
1
December 20, 1999
Features
·
Operating voltage: 2.5V~5.5V
·
Minimal external components
·
No external filter is required
·
Low standby current (on power down mode)
·
Excellent performance
·
Tristate data output for mC interface
·
3.58MHz crystal or ceramic resonator
·
1633Hz can be inhibited by the INH pin
·
HT9170B: 18-pin DIP package
HT9170D: 18-pin SOP package
General Description
The HT9170 series are Dual Tone Multi Fre-
quency (DTMF) receivers integrated with digi-
tal decoder and bandsplit filter functions. The
HT9170B and HT9170D types supply
power-down mode and inhibit mode operations.
All types of the HT9170 series use digital count-
ing techniques to detect and decode all the 16
DTMF tone pairs into a 4-bit code output.
Highly accurate switched capacitor filters are
employed to divide tone (DTMF) signals into
low and high group signals. A built-in dial tone
rejection circuit is provided to eliminate the
need for pre-filtering.


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