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MH88422 Datasheet(PDF) 1 Page - Mitel Networks Corporation

Part # MH88422
Description  Line Interface Circuit Preliminary Information
Download  12 Pages
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Manufacturer  MITEL [Mitel Networks Corporation]
Direct Link  http://www.mitel.com
Logo MITEL - Mitel Networks Corporation

MH88422 Datasheet(HTML) 1 Page - Mitel Networks Corporation

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2-21
®
Features
•
FAX and Modem interface (V29/V22 bis)
•
Variants match German, UK & 600
Ω network
impedances
•
Provides reinforced barrier to international PTT
requirements
•
Transformerless 2-4 Wire conversion
•
Loop start operation
•
Pulse and DTMF operation
•
Accommodates external monitor phone
•
Line state detection outputs:
•
-loop current/ringing outputs
•
Single +5V operation, low idle power (5mW)
•
Full Duplex
•
Suitable for power down applications
Applications
Interface to Central Office for:
•DAA
•
Modem
•FAX
•
Answering Machine
•
Terminal Equipment
Description
The Mitel MH88422 Line Interface Circuit provides a
complete audio and signalling link between audio
equipment and central office. The functions provided
by the MH88422 include 2-4 Wire conversion, loop
seizure, ring voltage and loop current detection. The
device is fabricated as thick film hybrid which
incorporates various technologies for optimum circuit
design,
high
voltage
isolation
and
very
high
reliability.
Variants are provided to meet German (-1) and UK
(-3)
line
impedance
(see
section
on
Line
Impedances), as well as a 600
Ω variants (-2).
ISSUE 5
April 1995
Ordering Information
MH88422-1
14 Pin DIL Package
MH88422-2
14 Pin DIL Package
MH88422-3
14 Pin DIL Package
Surface Mount Options are available by adding the
Suffix “S”
Power
Supply
Opto-
Isolation
Logic Input
Buffer
Opto-
Isolation
Opto-
Isolation
Opto-
Isolation
Audio
Buffer
Audio
Buffer
Ring & Loop
Buffer
Transhybrid
Loss
Cancellation
Circuit
Active
Termination
Audio Input
Buffer
Input
Buffer
Isolation Barrier
VDD
AGND
LC
VR
VX
RVLC
TIP
RING
TXIN
TF
RLS
USER CONNECTIONS
NETWORK CONNECTIONS
Figure 1 - Functional Block Diagram
MH88422
Line Interface Circuit
Preliminary Information


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