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MT8880CS-1 Datasheet

  • MT8880CS-1

  • ISO2-CMOS Integrated DTMFTransceiver

  • 315.92KB

  • 18頁

  • MITEL

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廬
ISO
2
-CMOS
MT8880C/MT8880C-1
Integrated DTMF Transceiver
Features
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Complete DTMF transmitter/receiver
Central office quality
Low power consumption
Microprocessor port
Adjustable guard time
Automatic tone burst mode
Call progress mode
ISSUE 2
May 1995
Ordering Information
MT8880CE/CE-1
20 Pin Plastic DIP
MT8880CC/CC-1
20 Pin Ceramic DIP
MT8880CS/CS-1
20 Pin SOIC
MT8880CN/CN-1
24 Pin SSOP
MT8880CP/CP-1
28 Pin Plastic LCC
-40擄C to +85擄C
based upon the industry standard MT8870
monolithic DTMF receiver; the transmitter utilizes a
switched capacitor D/A converter for low distortion,
high accuracy DTMF signalling. Internal counters
provide a burst mode such that tone bursts can be
transmitted with precise timing. A call progress filter
can be selected allowing a microprocessor to
analyze
call
progress
tones.
A
standard
microprocessor bus is provided and is directly
compatible with 6800 series microprocessors. The
MT8880C-1 is functionally identical to the MT8880C
except for the performance of the receiver section,
which is enhanced to accept and reject lower signal
levels.
Applications
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Credit card systems
Paging systems
Repeater systems/mobile radio
Interconnect dialers
Personal computers
Description
The MT8880C/C-1 is a monolithic DTMF transceiver
with call progress filter. It is fabricated in Mitel鈥檚
ISO
2
-CMOS technology, which provides low power
dissipation and high reliability. The DTMF receiver is
TONE
鈭?/div>
D/A
Converters
Row and
Column
Counters
Transmit Data
Register
Status
Register
Data
Bus
Buffer
D0
D1
D2
D3
Tone Burst
Gating Cct.
IN+
IN-
GS
OSC1
OSC2
Oscillator
Circuit
Bias
Circuit
V
DD
V
Ref
V
SS
+
-
Dial
Tone
Filter
Control
Logic
Interrupt
Logic
IRQ/CP
High Group
Filter
Low Group
Filter
Control
Logic
Digital
Algorithm
and Code
Converter
Control
Register
A
Control
Register
B
I/O
Control
桅2
CS
R/W
RS0
Steering
Logic
Receive Data
Register
ESt
St/GT
Figure 1 - Functional Block Diagram
4-33

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