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MT8889C 数据手册 - Mitel
制造商:
Mitel
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3D模型
符号图
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产品图
MT8889C数据手册
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4-107
Features
• Central office quality DTMF transmitter/
receiver
• Low power consumption
• High speed adaptive micro interface
• Adjustable guard time
• Automatic tone burst mode
• Call progress tone detection to -30dBm
Applications
• Credit card systems
• Paging systems
• Repeater systems/mobile radio
• Interconnect dialers
• Personal computers
Description
The MT8889C is a monolithic DTMF transceiver with
call progress filter. It is fabricated in CMOS
technology offering low power consumption and high
reliability.
The receiver section is based upon the industry
standard MT8870 DTMF receiver while the
transmitter utilizes a switched capacitor D/A
converter for low distortion, high accuracy DTMF
signalling. Internal counters provide a burst mode
such that tone bursts can be transmitted with precise
timing. A call progress filter can be selected allowing
a microprocessor to analyze call progress tones.
The MT8889C utilizes an adaptive micro interface,
which allows the device to be connected to a number
of popular microcontrollers with minimal external
logic. The MT8889C-1 is functionally identical to the
MT8889C except the receiver is enhanced to accept
lower level signals, and also has a specified low
signal rejection level.
Ordering Information
MT8889CE/CE-1 20 Pin Plastic DIP
MT8889CC/CC-1 20 Pin Ceramic DIP
MT8889CS/CS-1 20 Pin SOIC
MT8889CN/CN-1 24 Pin SSOP
-40°C to +85°C
Figure 1 - Functional Block Diagram
TONE
IN+
IN-
GS
OSC1
OSC2
V
DD
V
Ref
V
SS
ESt St/GT
D0
D1
D2
D3
IRQ
/CP
DS/RD
CS
R/W/WR
RS0
∑
D/A
Converters
Row and
Column
Counters
Transmit Data
Register
Data
Bus
Buffer
Tone Burst
Gating Cct.
+
-
Oscillator
Circuit
Bias
Circuit
Control
Logic
Digital
Algorithm
and Code
Converter
Control
Logic
Steering
Logic
Status
Register
Control
Register
A
Control
Register
B
Receive Data
Register
Interrupt
Logic
I/O
Control
Low Group
Filter
High Group
Filter
Dial
Tone
Filter
ISSUE 2 May 1995
MT8889C/MT8889C-1
Integrated DTMFTransceiver
with Adaptive Micro Interface
查询MT8889C供应商 捷多邦，专业PCB打样工厂，24小时加急出货
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