CALIFORNIA MICRO DEVICES
CM8870/70C
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)
Applications
• PABX
• Central office
• Mobile radio
• Remote control
• Remote data entry
• Call limiting
• Telephone answering systems
• Paging systems
• CM8870C is fully compatible with CM8870 for 18-pin
devices by grounding pins 5 and 6
Product Description
The CAMD CM8870/70C provides full DTMF receiver capability by integrating both the bandsplit filter and digital
decoder functions into a single 18-pin DIP, SOIC, or 20-pin PLCC package. The CM8870/70C is manufactured using
state-of-the-art CMOS process technology for low power consumption (35mW, max.) and precise data handling. The
filter section uses a switched capacitor technique for both high and low group filters and dial 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 providing an on-chip differential input ampli-
fier, clock generator, 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.
© 2000 California Micro Devices Corp. All rights reserved.
9/28/2000
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Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
215 Topaz Street, Milpitas, California 95035
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CALMIRCO [ CALIFORNIA MICRO DEVICES CORP ]
