MT3171B Datasheet, PDF (1/15 Pages) Zarlink Semiconductor Inc – Wide Dynamic Range DTMF Receiver

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
➀
PWDN
VDD
VSS
INPUT
Voltage
Bias Circuit
AGC
Anti-
alias
Filter
Dial
Tone
Filter
➁
OSC2
OSC1
(CLK)
Oscillator
and
Clock
Circuit
To All Chip Clocks
➀ MT3170B/71B and MT337xB only.
➁ MT3270B/71B and MT337xB only.
➂ MT3x71B only.
High
Group
Filter
Low
Group
Filter
Steering
Circuit
Digital
Detector
Algorithm
Code
Converter
and
Latch
Energy
Detection
Figure 1 - Functional Block Diagram
Digital
Guard
Time^➂
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.
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