CMOS Integrated DTMF Receiver
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projectsofme
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Posts: 1,124
Joined: Jun 2010
#1
18-10-2010, 12:25 PM


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 pins 5 and 6
Applications
• PABX
• Central office
• Mobile radio
• Remote control
• Remote data entry
• Call limiting
• Telephone answering systems
• Paging systems


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 amplifier, 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.
For more information about this article,please follow the link:
googleurl?sa=t&source=web&cd=1&ved=0CBUQFjAA&url=http%3A%2F%2Fdatasheetcatalog.org%2Fdatasheet%2Fcalmicro%2FCM8870.pdf&ei=au67TPzhJYWmcLzR-aAP&usg=AFQjCNHw0OEuiyIWGqm2BzYDiIsZa_h3Ug
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