MT88L89AS Mitel, MT88L89AS Datasheet
MT88L89AS
Manufacturer Part Number
MT88L89AS
Description
SOP20
Manufacturer
Mitel
Datasheet
1.MT88L89AS.pdf
(20 pages)
Specifications of MT88L89AS
Date_code
04+
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Features
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Applications
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Description
The MT88L89 is a monolithic DTMF transceiver with
call progress filter.
technology offering low power consumption and high
reliability.
TONE
OSC1
OSC2
IN+
GS
Central office quality DTMF transmitter/
receiver
Low voltage operation (2.7-3.6V)
Adjustable guard time
Automatic tone burst mode
Call progress tone detection to -30dBm
Adaptive micro interface enables compatibility
with existing MT8880/MT8888 designs
DTMF transmitter/receiver power down via
register control
Credit card systems
Paging systems
Repeater systems/mobile radio
Interconnect dialers
Personal computers
IN-
V
+
-
DD
Oscillator
Circuit
Circuit
V
Bias
Tone Burst
Gating Cct.
Ref
Tone
Filter
Dial
V
SS
It is fabricated in CMOS
Converters
High Group
Low Group
D/A
Control
Filter
Filter
Control
Logic
Logic
Advance Information
Figure 1 - Functional Block Diagram
ESt
Row and
Counters
Column
Converter
and Code
Algorithm
Digital
Steering
Logic
St/GT
The receiver section is based upon the industry
standard
transmitter
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.
The MT88L89 utilizes an adaptive micro interface,
which allows the device to be connected to a number
of popular microcontrollers with minimal external
logic. The MT88L89 provides enhanced power down
features.
independently be powered down via register control.
Transmit Data
Receive Data
Register
Register
3V Integrated DTMF Transceiver
Register
Register
Status
Control
Register
MT88L89AE
MT88L89AC
MT88L89AS
MT88L89AN
MT88L89AP
Control
A
with Adaptive Micro Interface
B
MT8870
utilizes
The transmitter and
Ordering Information
-40°C to +85°C
DTMF
a
ISSUE 1
switched
Buffer
Control
Data
Interrupt
Bus
20 Pin Plastic DIP
20 Pin Ceramic DIP
20 Pin SOIC
24 Pin SSOP
28 Pin PLCC
Logic
I/O
receiver
MT88L89
capacitor
receiver
while
D0
D1
D2
D3
IRQ/CP
DS/RD
CS
R/W/WR
RS0
May 1995
may
4-125
D/A
the
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