MT3271BE Mitel, MT3271BE Datasheet
![no-image](/images/manufacturer_photos/0/4/450/mitel_sml.jpg)
MT3271BE
Manufacturer Part Number
MT3271BE
Description
Manufacturer
Mitel
Specifications of MT3271BE
Package
DIP8
Date_code
0448+
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MT3271BE
Manufacturer:
HITACHI
Quantity:
5 510
Part Number:
MT3271BE
Manufacturer:
BB
Quantity:
20 000
Company:
Part Number:
MT3271BE1
Manufacturer:
Zarlink
Quantity:
20
Company:
Part Number:
MT3271BE1
Manufacturer:
MAXIM
Quantity:
82
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