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參數資料
| 型號： | CM8872CEI |
| 英文描述： | DTMF Receiver |
| 中文描述： | 雙音多頻接收器 |
| 文件頁數： | 1/9頁 |
| 文件大小： | 76K |
| 代理商： | CM8872CEI |
2001 California Micro Devices Corp. All rights reserved.
12/18/2001
1
215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
CM8870/70C
CALIFORNIA MICRO DEVICES
CMOS Integrated DTMF Receiver
Features
Full DTMF receiver
Less than 35mW power consumption
Industrial temperature range
Uses quartz crystal or ceramic resonators
Adjustable acquisition and release times
18-pin DIP, 18-pin DIP EIAJ, 18-pin SOIC, 20-pin
PLCC
CM8870C
— Power down mode
— Inhibit mode
— Buffered OSC3 output (PLCC package only)
CM8870C is fully compatible with CM8870 for 18-pin
devices by grounding pin 5 and pin 6.
Product Description
The CAMD CM8870/70C provides full DTMF receiver
capability by integrating both the band-split filter and
digital decoder functions into a single 18-pin DIP, SOIC,
or 20-pin PLCC package. The CM8870/70C is manufac-
tured using state-of-the-art CMOS process technology
for low power consumption (35mW, MAX) and precise
data handling. The filter section uses a switched capaci-
tor technique for both high and low group filters and dial
Applications
PABX
Central office
Mobile radio
Remote control
Remote data entry
Call limiting
Telephone answering systems
Paging systems
C1581000
tone rejection. The CM8870/70C decoder uses digital
counting techniques for the detection and decoding of all
16 DTMF tone pairs into a 4-bit code. This DTMF
receiver minimizes external component count by provid-
ing an on-chip differential input amplifier, clock genera-
tor, and a latched three-state interface bus. The on-chip
clock generator requires only a low cost TV crystal or
ceramic resonator as an external component.
Block Diagram
DIGITAL
DETECTION
ALGORITHM
ZERO
CROSSING DETECTORS
CODE
CONVERTER
AND
LATCH
+
–
V
DD
IN+
IN
–
BIAS
CIRCUIT
V
SS
CHIP
REF
CHP
BIAS
CHP
POWER
V
REF
StD
STEERING
LOGIC
PD
DIAL
TONE
FILTER
HIGH
GROUP
FILTER
LOW
GROUP
FILTER
+
–
INH
TOE
Q1
ESt
St
GT
OSC 1
OSC 2
OSC 3
TO ALL
CHIP
CLOCKS
St/GT
Q2
Q3
Q4
GS
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| CM8872CF | DTMF Receiver |
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| CM8872CFI | Telecommunication IC |
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| CM8872CPEI | DTMF Receiver |
相關代理商/技術參數 |
參數描述 |
|---|---|
| CM8872CF | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DTMF Receiver |
| CM8872CF-1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DTMF Receiver |
| CM8872CFI | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication IC |
| CM8872CP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DTMF Receiver |
| CM8872CPEI | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DTMF Receiver |
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