M-8888
DTMF Transceiver
Features
CMOS technology
·
Advancedand increased noisefor low power con-
sumption
immunity
·
Complete DTMF transmitter/receiver in a single
chip
·
Standard 8051, 8086/8 microprocessor port
·
Central office quality and performance
guard time
·
Adjustable tone burst mode
·
Automatic mode
·
Call progress power supply
·
Single +5 Volt SOIC packages
·
20-pin DIP and port operation
·
2 MHz microprocessor crystal
·
Inexpensive 3.58 MHz
Applications
Description
The M-8888 is a complete DTMF Transmitter
Receiver that features adjustable guard time, auto-
matic tone burst mode, call progress mode, and a fully
compatible 8051, 8086/8 microprocessor interface.
The receiver portion is based on the industry standard
M-8870 DTMF Receiver, while the transmitter uses a
switched-capacitor digital-to-analog converter for low-
distortion, highly accurate DTMF signaling. Tone
bursts can be transmitted with precise timing by mak-
ing use of the automatic tone burst mode. To analyze
call progress tones, a call progress filter can be select-
ed by an external microprocessor.
·
Paging systems
·
Repeater systems/mobile radio
·
Interconnect dialers
·
PBX systems
·
Computer systems
·
Fax machines
·
Pay telephone
·
Credit card verification
Ordering Information
Part #
Description
M-8888-01P
M-8888-01SM
M-8888-01T
20-pin plastic DIP
20-pin plastic SOIC
20-pin plastic SOIC,Tape and Reel
Pin Connections
Block Diagram
DS-M8888-R1
www.clare.com
1
CLARE [ CLARE, INC. ]
