MT8870DC MITEL [Mitel Networks Corporation], MT8870DC Datasheet

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MT8870DC

Manufacturer Part Number
MT8870DC
Description
ISO2-CMOS Integrated DTMF Receiver
Manufacturer
MITEL [Mitel Networks Corporation]
Datasheet

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Features
Applications
PWDN
IN +
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
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
IN -
GS
Power
Chip
OSC1
VDD
Chip
Bias
Circuit
Bias
VSS
Tone
Filter
Dial
OSC2
Figure 1 - Functional Block Diagram
High Group
Low Group
Filter
Filter
to all
Chip
Clocks
Zero Crossing
Detectors
VRef
Buffer
ISO
VRef
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;
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.
St/GT
2
-CMOS
MT8870DE/DE-1
MT8870DC/DC-1
MT8870DS/DS-1
MT8870DN/DN-1
MT8870DT/DT-1
St
GT
ESt
Detection
Algorithm
Digital
INH
MT8870D/MT8870D-1
Integrated DTMF Receiver
the decoder uses digital counting
Ordering Information
Steering
Logic
-40 °C to +85 °C
ISSUE 3
STD
Converter
and Latch
18 Pin Plastic DIP
18 Pin Ceramic DIP
18 Pin SOIC
20 Pin SSOP
20 Pin TSSOP
Code
TOE
May1995
Q1
Q2
Q3
Q4
4-11

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MT8870DC Summary of contents

Page 1

... Dial Tone Filter OSC1 2 ISO -CMOS MT8870DE/DE-1 MT8870DC/DC-1 MT8870DS/DS-1 MT8870DN/DN-1 MT8870DT/DT-1 Description The MT8870D/MT8870D 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; ...

Page 2

MT8870D/MT8870D IN IN VRef 5 14 INH 13 PWDN 6 12 OSC1 7 11 OSC2 8 10 VSS 9 18 PIN CERDIP/PLASTIC DIP/SOIC Pin Description Pin # Name ...

Page 3

Functional Description The MT8870D/MT8870D-1 monolithic receiver offers small size, low power consumption and high performance. Its architecture consists of a bandsplit filter section, which separates the high and low group tones, followed by a digital counting section which verifies the ...

Page 4

MT8870D/MT8870D-1 condition is maintained (ESt remains high) for the validation period ( reaches the threshold GTP the steering logic to register the tone pair, TSt latching its corresponding 4-bit code (see Table 1) into ...

Page 5

Power-down and Inhibit Mode A logic high applied to pin 6 (PWDN) will power down the device to minimize the power consumption in a standby mode. It stops the oscillator and the functions of the filters. Inhibit mode is enabled ...

Page 6

MT8870D/MT8870D-1 Applications RECEIVER SYSTEM FOR BRITISH TELECOM SPEC POR 1151 The circuit shown in Fig. 9 illustrates the use of MT8870D-1 device in a typical receiver system. BT Spec defines the input signals less than -34 dBm as the non-operate ...

Page 7

Absolute Maximum Ratings Parameter 1 DC Power Supply Voltage 2 Voltage on any pin 3 Current at any pin (other than supply) 4 Storage temperature 5 Package power dissipation † Exceeding these values may cause permanent damage. Functional operation under ...

Page 8

MT8870D/MT8870D-1 Operating Characteristics - V Gain Setting Amplifier Characteristics 1 Input leakage current 2 Input resistance 3 Input offset voltage 4 Power supply rejection 5 Common mode rejection 6 DC open loop voltage gain 7 Unity gain bandwidth 8 Output ...

Page 9

MT8870D-1 AC Electrical Characteristics Characteristics Valid input signal levels (each 1 tone of composite signal) 2 Input Signal Level Reject 3 Negative twist accept 4 Positive twist accept 5 Frequency deviation accept 6 Frequency deviation reject 7 Third zone tolerance ...

Page 10

MT8870D/MT8870D-1 AC Electrical Characteristics Characteristics 1 Tone present detect time 2 Tone absent detect time Tone duration accept Tone duration reject Interdigit pause accept 6 Interdigit pause reject 7 Propagation delay ...

Page 11

A EVENTS t REC V in ESt St/ DECODED TONE # (n- StD TOE EXPLANATION OF EVENTS A) TONE BURSTS DETECTED, TONE DURATION INVALID, OUTPUTS NOT UPDATED. B) TONE #n DETECTED, TONE DURATION VALID, TONE DECODED ...

Page 12

MT8870D/MT8870D-1 NOTES: 4-22 2 ISO -CMOS ...

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