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Zarlink Semiconductor
Zarlink Semiconductor

MT3271B Datasheet Preview

MT3271B Datasheet

Wide Dynamic Range DTMF Receiver

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MT3271B pdf
www.DataSheet.co.kr
MT3170B/71B, MT3270B/71B, MT3370B/71B
Wide Dynamic Range DTMF Receiver
Data Sheet
Features
• Wide dynamic range (50 dB) 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)
• 4.194304 MHz crystal or ceramic resonator
(MT337xB and MT327xB)
• External clock input (MT317xB)
• Guarantees non-detection of spurious tones
Applications
• Integrated telephone answering machine
• End-to-end signalling
• Fax Machines
August 2005
Ordering Information
MT3170/71BE
8 Pin PDIP
MT3270/71BE
8 Pin PDIP
MT3370/71BS
18 Pin SOIC
MT3370/71BN
20 Pin SSOP
MT3370/71BSR
18 Pin SOIC
MT3371BNR
20 Pin SSOP
MT3270/71BE1
8 Pin PDIP*
MT3171BE1
8 Pin PDIP*
MT3170BE1
8 Pin PDIP**
MT3370/BN1
20 Pin SSOP*
MT3370/71BS1
18 Pin SOIC*
MT3370/71BSR1
18 Pin SOIC*
*Pb Free Matte Tin
**Pb Free Tin/Silver/Copper
Tubes
Tubes
Tubes
Tubes
Tape & Reel
Tape & Reel
Tubes
Tubes
Tubes
Tubes
Tubes
Tape & Reel
-40°C to 85°C
PWDN
VDD
VSS
INPUT
OSC2
OSC1
(CLK)
Voltage
Bias Circuit
AGC
Anti-
alias
Filter
Dial
Tone
Filter
Oscillator
and
Clock
Circuit
To All Chip Clocks
High
Group
Filter
Low
Group
Filter
Steering
Circuit
Digital
Detector
Algorithm
Code
Converter
and
Latch
Energy
Detection
MT3170B/71B and MT337xB only.
MT3270B/71B and MT337xB only.
MT3x71B only.
Figure 1 - Functional Block Diagram
Digital
Guard
Time
Parallel to
Serial
Converter
& Latch
Mux
1
Zarlink Semiconductor Inc.
Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc.
Copyright 1995-2005, Zarlink Semiconductor Inc. All Rights Reserved.
ESt
or
DStD
ACK
SD
Datasheet pdf - http://www.DataSheet4U.net/



Zarlink Semiconductor
Zarlink Semiconductor

MT3271B Datasheet Preview

MT3271B Datasheet

Wide Dynamic Range DTMF Receiver

No Preview Available !

MT3271B pdf
www.DataSheet.co.kr
MT3170B/71B, MT3270B/71B, MT3370B/71B
Data Sheet
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 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. The cadence 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.
MT3170B/71B
MT3270B/71B
INPUT
PWDN
CLK
VSS
1
2
3
4
8 VDD INPUT 1
7
ESt/
DStD
OSC2
2
6 ACK OSC1 3
5 SD
VSS 4
8 VDD
7
ESt/
DStD
6 ACK
5 SD
8 PIN PLASTIC DIP
MT3370B/71B
NC
INPUT
PWDN
OSC2
NC
OSC1
NC
NC
VSS
1
2
3
4
5
6
7
8
9
18 VDD
17 NC
16 NC
15 ESt/DStD
14 NC
13 ACK
12 NC
11 SD
10 NC
18 PIN PLASTIC SOIC
NC
NC
INPUT
PWDN
NC
OSC2
OSC1
VSS
NC
NC
MT3370B/71B
1 20
2 19
3 18
4 17
5 16
6 15
7 14
8 13
9 12
10 11
20 PIN SSOP
NC
NC
VDD
NC
ESt/DStD
NC
ACK
SD
NC
NC
Pin Description
337xB
2
4
6
Pin #
327xB
1
2
3
94
11 5
13 6
317xB
1
-
3
4
5
6
Figure 2 - Pin Connections
Name
Description
INPUT
OSC2
OSC1
(CLK)
VSS
SD
ACK
DTMF/CP Input. Input signal must be AC coupled via capacitor.
Oscillator Output.
Oscillator/Clock Input. This pin can either be driven by:
1) an external digital clock with defined input logic levels. OSC2
should be left open.
2) connecting a crystal or ceramic resonator between OSC1 and
OSC2 pins.
Ground. (0V)
Serial Data/Call Progress Output. This pin serves the dual function
of being the serial data output when clock pulses are applied after
validation of DTMF signal, and also indicates the cadence of call
progress input. As DTMF signal lies in the same frequency band as
call progress signal, this pin may toggle for DTMF input. The SD pin
is at logic low in powerdown state.
Acknowledge Pulse Input. After ESt or DStD is high, applying a
sequence of four pulses on this pin will then shift out four bits on the
SD pin, representing the decoded DTMF digit. The rising edge of the
first clock is used to latch the 4-bit data prior to shifting. This pin is
pulled down internally. The idle state of the ACK signal should be
low.
2
Zarlink Semiconductor Inc.
Datasheet pdf - http://www.DataSheet4U.net/


Part Number MT3271B
Description Wide Dynamic Range DTMF Receiver
Maker Zarlink Semiconductor
Total Page 15 Pages
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