M-8880 Datasheet PDF - Clare Inc.


Clare Inc.

Part Number M-8880
Description M-8880 DTMF Transceiver
Page 13 Pages

M-8880 datasheet pdf
Download PDF for PC
M-8880 pdf
View PDF for Mobile

No Preview Available !

M-8880 DTMF Transceiver
· Advanced CMOS technology for low power consump-
tion and increased noise immunity
· Complete DTMF transmitter/receiver in a single chip
· Standard 6500/6800 series 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 and SOIC packages
· 2 MHz microprocessor port operation
· Inexpensive 3.58 MHz crystal
· No continuous f2 clock required, only strobe
· Applications include: paging systems, repeater sys-
tems/mobile radio, interconnect dialers, PBX systems,
computer systems, fax machines, pay telephones,
credit card verification
The M-8880 is a complete DTMF Transmitter/Receiver that fea-
tures adjustable guard time, automatic tone burst mode, call
progress mode, and a fully compatible 6500/6800 microproces-
sor interface. The receiver portion is based on the industry stan-
dard 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 making use of the auto-
matic tone burst mode. To analyze call progress tones, a call
progress filter can be selected by an external microprocessor.
Figure 1 Pin Diagram
Functional Description
M-8880 functions consist of a high-performance DTMF receiver
with an internal gain setting amplifier and a DTMF generator that
contains a tone burst counter for generating precise tone bursts
and pauses. The call progress mode, when selected, allows the
detection of call progress tones. A standard 6500/6800 series
microprocessor interface allows access to an internal status
register, two control registers, and two data registers.
Input Configuration
The input arrangement consists of a differential input opera-
tional amplifier and bias sources (VREF) for biasing the amplifier
inputs at VDD/2. Provisions are made for the connection of a
feedback resistor to the op-amp output (GS) for gain adjust-
40-406-00012, Rev. G
Figure 2 Block Diagram
Page 1

M-8880 datasheet pdf
Download PDF for PC
M-8880 pdf
View PDF for Mobile

Related : Start with M-888 Part Numbers by
M-8880 M-8880 DTMF Transceiver M-8880
Clare Inc.
M-8880 pdf
M-8888 DTMF Transceiver M-8888
Clare Inc.
M-8888 pdf
M-8888-01 DTMF Transceiver M-8888-01
Clare Inc.
M-8888-01 pdf
M-8888-01P DTMF Transceiver M-8888-01P
Clare Inc.
M-8888-01P pdf
M-8888-01SM DTMF Transceiver M-8888-01SM
Clare Inc.
M-8888-01SM pdf
M-8888-01T DTMF Transceiver M-8888-01T
Clare Inc.
M-8888-01T pdf

Index :   0   1   2   3   4   5   6   7   8   9   A   B   C   D   E   F   G   H   I   J   K   L   M   N   O   P   Q   R   S   T   U   V   W   X   Y   Z   NEW   

Since 2010   ::   HOME   ::   Contact