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PDF HT9020B Data sheet ( Hoja de datos )
| Número de pieza | HT9020B | |
| Descripción | Call Progress Tone Detector | |
| Fabricantes | Holtek Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de HT9020B (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
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HT9020B
Call Progress Tone Detector
Features
· Operating voltage: 2.5V~5.5V
· Low power consumption
· Low cost 32768Hz crystal
· CPT Band: 305~640Hz detection
· Good performance:
-8 ~ -39 dBm at VDD=2.5V
0 ~ -27 dBm at VDD=5V
· 8-pin DIP package
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.
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.
Block Diagram
X 1 32768H z
X 2 O s c illa to r
S IN B a n d p a s s
. ilte r
C lo c k
G e n e ra to r
Level
S ense C K T
VRE.
G e n e ra to r
D ig ita l
C o n tro l C K T
VRE.
EN
ENV
VSS
VDD
Pin Assignment
ENV 1
VRE. 2
S IN 3
VSS 4
8
7
6
5
H T9020B
8 D IP -A
VDD
EN
X2
X1
Rev. 1.20
1 March 31, 2003
1 page  
HT9020B
Application Circuits
0 .0 1 m . 1 0 0 k W
T IP
R IN G
0 .0 1 m . 1 0 0 k W
+
-
100kW
V DD
M CU
1 0 0 k W 0 .1 m .
1 ENV
V DD
VDD 8
27
VRE. EN
470kW
3
20p.
4
S IN
VSS
X2 6
5
X1
H T9020B
32768H z
Rev. 1.20
5 March 31, 2003
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet HT9020B.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| HT9020 | Call Progress Tone Decoder & ABR Controller | Holtek Semiconductor |
| HT9020B | Call Progress Tone Detector | Holtek Semiconductor |
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