© 2000 California Micro Devices Corp. All rights reserved.

6/16/2000

1

CM88L70/70C

CALIFORNIA MICRO DEVICES

215 Topaz Street, Milpitas, California 95035

Tel: (408) 263-3214

Fax: (408) 263-7846

www.calmicro.com

CMOS INTEGRATED DTMF RECEIVER, 3 VOLT VERSION

Product Description

The CAMD CM88L70/70C 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, TSSOP, or QSOP package. The CM88L70/70C 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 CM88L70/70C

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.

Block Diagram

Features

• 2.7 to 3.6 volt operating range

• Full DTMF receiver

• Less than 18mW power consumption

• Industrial temperature range

• Uses quartz crystal or ceramic resonators

• Adjustable acquisition and release times

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

20-pin PLCC, 20-pin TSSOP

• CM88L70

- Power down mode

- Inhibit mode

- Buffered oscillator output (OSC 3) to

drive other devices

Applications

• PCMCIA

• Portable TAD

• Mobile radio

• Remote control

• Remote data entry

• Call limiting

• Telephone answering systems

• Paging systems

C0451098