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CM8888 Datasheet, PDF (1/13 Pages) California Micro Devices Corp – CMOS INTEGRATED DTMF TRANCEIVER | |||
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CALIFORNIA MICRO DEVICES
CM8888/8888-2
CMOS INTEGRATED DTMF TRANCEIVER
Fea tur es
 Advanced CMOS technology for low power
consumption and increased noise immunity
 Complete DTMF
 Transmitter/Receiver
 Standard 8051, 8086/8 microprocessor port
 Central office quality and performance
 Adjustable guard time
 Automatic tone burst mode
 Call progress mode
 Single +5 volt power supply
 20-pin DIP, 20-pin DIP EIAJ, 20-pin SOIC,
28-pin PLCC packages
 2 MHz microprocessor port operation
Applications
 Paging systems
 Repeater systems/mobile radio
 Interconnect dialers
 PABX systems
 Computer systems
 Fax machines
 Pay telephones
 Credit card verification
Product Description
The CAMD CM8888/8888-2 is a fully integrated DTMF Transceiver, featuring adjustable guard time, automatic tone burst
mode, call progress mode, and a fully compatible 8051, 8086/8 microprocessor interface. The CM8888/8888-2 is
manufactured using state-of-the-art advanced CMOS technology for low power consumption and precise data handling.
The CM8888/8888-2 is based on the industry standard CM8870 DTMF Receiver, while the transmitter utilizes a switched-
capacitor D/A converter for low distortion, highly accurate DTMF signaling. Internal counters provide an automatic tone
burst mode which allows tone bursts to be transmitted with precise timing. A call progress filter can be selected by an
external microprocessor for analyzing call progress tones. The CM8888-2 is electrically equivalent to the CM8888 but does
not include the call progress function.
Block Diagram
All trademarks are the property of their respective holders.
© 2000 California Micro Devices Corp. All rights reserved.
5/00
215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
C0400798D
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