CM8870CL

更新时间： 2024-01-26 14:13:31

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CM8870CL 数据手册

CALIFORNIA MICRO DEVICES

CM8870/70C

CMOS Integrated DTMF Receiver

Features

Applications

• Full DTMF receiver

• PABX

• Less than 35mW power consumption

• Industrial temperature range

• Central office

• Mobile radio

• Uses quartz crystal or ceramic resonators

• Adjustable acquisition and release times

• Remote control

• Remote data entry

• Call limiting

• 18-pin DIP, 18-pin DIP EIAJ, 18-pin SOIC, 20-pin

PLCC

• Telephone answering systems

• Paging systems

• 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

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.

C1550900

www.calmicro.com

9/28/2000 215 Topaz Street, Milpitas, California 95035

Tel: (408) 263-3214

Fax: (408) 263-7846

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