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參數資料
| 型號： | MT3371B |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | Wide Dynamic Range DTMF Receiver(50dB的寬動態范圍雙音多頻信號（DTMF）接收器) |
| 中文描述： | 寬動態范圍的DTMF接收器（50分貝的寬動態范圍雙音多頻信號（DTMF）的接收器） |
| 文件頁數： | 1/11頁 |
| 文件大小： | 70K |
| 代理商： | MT3371B |
4-3
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 & MT337xB)
4.194304MHz 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
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.
Ordering Information
MT3170/71BE
MT3270/71BE
MT3370/71BS
MT3370/71BN
-40
°
C to +85
°
C
8 Pin Plastic DIP
8 Pin Plastic DIP
18 Pin SOIC
20 Pin SSOP
Figure 1 - Functional Block Diagram
PWDN
VDD
VSS
INPUT
OSC2
OSC1
(CLK)
MT3170B/71B and MT337xB only.
MT3270B/71B and MT337xB only.
MT3x71B only.
Voltage
Bias Circuit
AGC
Anti-
alias
Filter
High
Group
Filter
Low
Group
Filter
Steering
Circuit
Digital
Detector
Algorithm
Code
Converter
and
Latch
Digital
Guard
Time
Parallel to
Serial
Converter
& Latch
Mux
Energy
Detection
Oscillator
and
Clock
Circuit
To All Chip Clocks
Dial
Tone
Filter
ESt
or
DStD
ACK
SD
ISSUE 2
May 1995
MT3170B/71B, MT3270B/71B, MT3370B/71B
Wide Dynamic Range DTMF Receiver
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MT3371BN | 制造商:Microsemi Corporation 功能描述: |
| MT3371BN1 | 制造商:Microsemi Corporation 功能描述:DTMF RX 4.19MHZ 5V 20SSOP - Rail/Tube |
| MT3371BNR | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Wide Dynamic Range DTMF Receiver |
| MT3371BNR1 | 制造商:Microsemi Corporation 功能描述:DTMF RX 4.19MHZ 5V 20SSOP - Tape and Reel 制造商:Zarlink Semiconductor Inc 功能描述:DTMF RX 4.19MHZ 5V 20SSOP - Tape and Reel |
| MT3371BS | 制造商:Microsemi Corporation 功能描述:DTMF RX 4.19MHZ 5V 18SOIC - Bulk |
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