MT3170 MITEL [Mitel Networks Corporation], MT3170 Datasheet

MT3170

Manufacturer Part Number

MT3170

Description

Wide Dynamic Range DTMF Receiver

Manufacturer

MITEL [Mitel Networks Corporation]

Datasheet

1.MT3170.pdf (8 pages)

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Features

•

Applications

•

Description

The MT3x7xB is a family of high performance DTMF

receivers which decode all 16 tone pairs into a 4-bit

binary code. These devices incorporate an AGC for

wide dynamic range and are suitable for end-to-end

PWDN

INPUT

OSC1

(CLK)

OSC2

VDD

VSS

Wide dynamic range (50dB) DTMF Receiver

Call progress (CP) detection via cadence

indication

4-bit synchronous serial data output

Software controlled guard time for MT3x70B

Internal guard time circuitry for MT3x71B

Powerdown option (MT317xB & MT337xB)

4.194304MHz crystal or ceramic resonator

(MT337xB and MT327xB)

External clock input (MT317xB)

Guarantees non-detection of spurious tones

Integrated telephone answering machine

End-to-end signalling

Fax Machines

MT3170B/71B and MT337xB only.

MT3270B/71B and MT337xB only.

MT3x71B only.

Oscillator

Circuit

Clock

Bias Circuit

and

Voltage

AGC

Filter

Anti-

alias

To All Chip Clocks

Tone

Filter

Dial

Figure 1 - Functional Block Diagram

Group

High

Filter

Low

MT3170B/71B, MT3270B/71B, MT3370B/71B

Wide Dynamic Range DTMF Receiver

signalling. The MT3x70B provides an early steering

(ESt) logic output to indicate the detection of a DTMF

signal and requires external software guard time to

validate the DTMF digit. The MT3x71B, with preset

internal guard times, uses a delay steering (DStD)

logic output to indicate the detection of a valid DTMF

digit. The 4-bit DTMF binary digit can be clocked out

synchronously at the serial data (SD) output. The

SD pin is multiplexed with call progress detector

output. In the presence of supervisory tones, the

call progress detector circuit indicates the cadence

(i.e., envelope) of the tone burst.

information can then be processed by an external

microcontroller to identify specific call progress

signals. The MT327xB and MT337xB can be used

with a crystal or a ceramic resonator without

additional components. A power-down option is

provided for the MT317xB and MT337xB.

Algorithm

Detector

Digital

MT3170/71BE

MT3270/71BE

MT3370/71BS

MT3370/71BN

Detection

Energy

Steering

Circuit

Ordering Information

-40 °C to +85 °C

Converter

Code

Latch

and

ISSUE 2

8 Pin Plastic DIP

18 Pin SOIC

20 Pin SSOP

Parallel to

Converter

Digital

Guard

Time

& Latch

Serial

Mux

The cadence

May 1995

ACK

DStD

ESt

4-3

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