CM8870PI California Micro Devices Corporation, CM8870PI Datasheet

CM8870PI

Manufacturer Part Number

CM8870PI

Description

DIP-18

Manufacturer

California Micro Devices Corporation

Datasheets

1.CM8870PI.pdf (8 pages)

2.CM8870PI.pdf (9 pages)

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Download datasheet (338Kb)

12/18/2001

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

• CM8870C

• CM8870C is fully compatible with CM8870 for 18-pin

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

215 Topaz Street, Milpitas, California 95035

PLCC

— Power down mode

— Inhibit mode

— Buffered OSC3 output (PLCC package only)

devices by grounding pin 5 and pin 6.

CALIFORNIA MICRO DEVICES

IN+

IN–

OSC 1

–

POWER

CHP

CIRCUIT

OSC 2

BIAS

CMOS Integrated DTMF Receiver

BIAS

CHP

FILTER

TONE

DIAL

CHIP

REF

OSC 3

–

CROSSING DETECTORS

CLOCKS

GROUP

FILTER

TO ALL

HIGH

LOW

CHIP

Tel: (408) 263-3214

Block Diagram

ZERO

REF

St/GT

Applications

• PABX

• Central office

• Mobile radio

• Remote control

• Remote data entry

• Call limiting

• Telephone answering systems

• Paging systems

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.

ALGORITHM

DETECTION

DIGITAL

ESt

STEERING

LOGIC

Fax: (408) 263-7846

CONVERTER

LATCH

CODE

StD

AND

INH

TOE

CM8870/70C

www.calmicro.com

C1581000

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