MT8870DE
ISO2-CMOS Integrated DTMF Receiver

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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 tonepairs 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.

• 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
Parameter Symbol Min MAX Units
1 DC Power Supply Voltage VDD 6 V
2 Voltage on any pin (other than supply) VI Vss-0.3 VDD+0.3 V
3 Current at any pin (other than supply) VI 10 mA
4 Storage Temperature TSTG -65 +150 °C
5 Package Power Dissipation PD 500 mW
• 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

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Datasheet

Size: 215.03KB
Page: 12
PDF: MT8870DE.pdf
  • Description:
    ISO2-CMOS Integrated DTMF Receiver
  • MFG:
    MITEL [Mitel Networks Corporation]
 

Abstract


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
ISO
2
-CMOS

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