MT8889CC_CC-1

Manufacturer Part NumberMT8889CC_CC-1
Description6V 10mA integrated DTMF transceiver with adaptive micro interface. For paging systems, repeater systems/mobile radio, credit card systems, personal computers, interconnect dialers
ManufacturerMitel Semiconductor
MT8889CC_CC-1 datasheet
 


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Features
Central office quality DTMF transmitter/
receiver
Low power consumption
High speed adaptive micro interface
Adjustable guard time
Automatic tone burst mode
Call progress tone detection to -30dBm
Applications
Credit card systems
Paging systems
Repeater systems/mobile radio
Interconnect dialers
Personal computers
Description
The MT8889C is a monolithic DTMF transceiver with
call progress filter.
It is fabricated in CMOS
technology offering low power consumption and high
reliability.
D/A
TONE
Converters
Tone Burst
Control
Gating Cct.
Logic
IN+
+
Dial
Tone
-
High Group
IN-
Filter
Filter
GS
Low Group
OSC1
Filter
Oscillator
Circuit
OSC2
Control
Bias
Circuit
V
V
V
DD
Ref
SS
with Adaptive Micro Interface
MT8889CE/CE-1
MT8889CC/CC-1
MT8889CS/CS-1
MT8889CN/CN-1
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 MT8889C utilizes an adaptive micro interface,
which allows the device to be connected to a number
of popular microcontrollers with minimal external
logic. The MT8889C-1 is functionally identical to the
MT8889C except the receiver is enhanced to accept
lower level signals, and also has a specified low
signal rejection level.
Row and
Transmit Data
Column
Register
Counters
Status
Register
Control
Register
A
Digital
Algorithm
Control
and Code
Converter
Register
B
Receive Data
Steering
Logic
Register
Logic
ESt
St/GT
Figure 1 - Functional Block Diagram
MT8889C/MT8889C-1
Integrated DTMF Transceiver
ISSUE 2
Ordering Information
20 Pin Plastic DIP
20 Pin Ceramic DIP
20 Pin SOIC
24 Pin SSOP
-40°C to +85°C
MT8870
DTMF
receiver
while
utilizes
a
switched
capacitor
Data
Bus
Buffer
Interrupt
Logic
I/O
Control
May 1995
the
D/A
D0
D1
D2
D3
IRQ/CP
DS/RD
CS
R/W/WR
RS0
4-107