HT9020B Holtek, HT9020B Datasheet
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HT9020B
Manufacturer Part Number
HT9020B
Description
DIP-8
Manufacturer
Holtek
Specifications of HT9020B
Date_code
02+
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
HT9020B
Manufacturer:
HOLTEK/合泰
Quantity:
20 000
Features
General Description
The HT9020B call progress tone detector is a telecom
peripheral for Auto-dialing system use.
Switched capacitors technology is implemented into the
chip to get good performance characteristics of band
pass filter in the range of 305 to 640Hz call progress
tone which is dual tone multi-frequency signal.
Block Diagram
Pin Assignment
Rev. 1.20
Operating voltage: 2.5V~5.5V
Low power consumption
Low cost 32768Hz crystal
CPT Band: 305~640Hz detection
1
When it detected CPT signal then it generates relative
envelopes for external microcontroller decision to finish
different kinds of CPT signal detection such as dial tone,
busy tone, ring-back tone and reorder tone.
Good performance:
0 ~ 27 dBm at V
8-pin DIP package
Call Progress Tone Detector
8 ~ 39 dBm at V
DD
DD
=5V
=2.5V
HT9020B
March 31, 2003