MT3171BE Mitel, MT3171BE Datasheet

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MT3171BE

Manufacturer Part Number
MT3171BE
Description
Wide dinamic range DTMF receiver (for integrated telephone answering machines, end-to-end signalling and fax machines)
Manufacturer
Mitel
Datasheet

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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
Group
High
Filter
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
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
SD
or
4-3

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MT3171BE Summary of contents

Page 1

Features • 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 ...

Page 2

MT3170B/71B, MT3270B/71B, MT3370B/71B MT3170B/71B MT3270B/71B INPUT VDD INPUT ESt/ PWDN OSC2 DStD CLK ACK OSC1 VSS VSS PIN PLASTIC DIP Pin Description Pin # 337xB 327xB ...

Page 3

Device 8 Pin Type MT3170B MT3171B MT3270B MT3271B MT3370B MT3371B Functional Description The MT3x7xBs are high performance and low power consumption DTMF receivers. provide wide dynamic range DTMF detection and a serial decoded data output. These devices also incorporate an ...

Page 4

MT3170B/71B, MT3270B/71B, MT3370B/71B Serial Data (SD) Output When a valid DTMF signal burst is present, ESt or DStD will go high. The application of four clock pulses on the ACK pin will provide a 4-bit serial binary code representing the ...

Page 5

Parameter Unit Resonator R1 Ohms 6.580 L1 mH 0.359 C1 pF 4.441 C0 pF 34.890 Qm - 1.299E+ ±0.2% Table 4. Recommended Resonator and Crystal Specifications Note: Qm=quality factor of RLC model, i.e., 1 ...

Page 6

MT3170B/71B, MT3270B/71B, MT3370B/71B Absolute Maximum Ratings Parameter 1 DC Power Supply Voltage 2 Voltage on any pin (other than supply) 3 Current at any pin (other than supply) 4 Storage temperature 5 Package power dissipation † Exceeding these values may ...

Page 7

AC Electrical Characteristics otherwise stated. Characteristics 1 Valid input signal level (each tone of composite signal) 2 Positive twist accept 3 Negative twist accept 4 Frequency deviation accept 5 Frequency deviation reject 6 Third tone tolerance 7 Noise tolerance 8 ...

Page 8

MT3170B/71B, MT3270B/71B, MT3370B/71B DTMF INPUT Tone # ESt (MT3x70B REC DStD (MT3x71B) ACK LSB MSB maximum allowable dropout during valid DTMF signals. ...

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