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MT8870 Datasheet(PDF) 1 Page - Mitel Networks Corporation

Part No. MT8870
Description  ISO2-CMOS Integrated DTMF Receiver
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Maker  MITEL [Mitel Networks Corporation]
Homepage  http://www.mitel.com
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 1 page
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4-11
®
MT8870D/MT8870D-1
Integrated DTMF Receiver
Features
Complete DTMF Receiver
Low power consumption
Internal gain setting amplifier
Adjustable guard time
Central office quality
Power-down mode
Inhibit mode
Backward compatible with
MT8870C/MT8870C-1
Applications
Receiver system for British Telecom (BT) or
CEPT Spec (MT8870D-1)
Paging systems
Repeater systems/mobile radio
Credit card systems
Remote control
Personal computers
Telephone answering machine
Description
The MT8870D/MT8870D-1 is a complete DTMF
receiver integrating both the bandsplit filter and
digital decoder functions. The filter section uses
switched
capacitor
techniques
for high and low
group filters;
the decoder uses digital counting
techniques to detect and decode all 16 DTMF tone-
pairs into a 4-bit code. External component count is
minimized by on chip provision of a differential input
amplifier, clock oscillator and latched three-state bus
interface.
Ordering Information
MT8870DE/DE-1
18 Pin Plastic DIP
MT8870DC/DC-1
18 Pin Ceramic DIP
MT8870DS/DS-1
18 Pin SOIC
MT8870DN/DN-1
20 Pin SSOP
MT8870DT/DT-1
20 Pin TSSOP
-40 °C to +85 °C
Figure 1 - Functional Block Diagram
PWDN
IN +
IN -
GS
OSC1
OSC2
St/GT
ESt
STD
TOE
Q1
Q2
Q3
Q4
VDD
VSS
VRef
INH
Bias
Circuit
Dial
Tone
Filter
High Group
Filter
Low Group
Filter
Digital
Detection
Algorithm
Code
Converter
and Latch
St
GT
Steering
Logic
Chip
Power
Chip
Bias
VRef
Buffer
Zero Crossing
Detectors
to all
Chip
Clocks
ISSUE 3
May1995
ISO2-CMOS




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