MH88422
Data Access Arrangement
Preliminary Information
Features
•
•
•
•
•
•
•
•
•
•
FAX and Modem interface (V29)
Variants available with different line
impedances
Provides reinforced barrier to international PTT
requirements
Transformerless 2-4 Wire conversion.
Integral Loop Switch
Dial Pulse and DTMF operation
Line state detection outputs
Loop current/ringing outputs
Single +5V operation, low on-hook power
(5mW)
Full duplex data transmission
The Mitel MH88422 Data Access Arrangement
(D.A.A.) provides a complete interface between data
transmission equipment and a telephone line. All
functions are integrated into a single thick film hybrid
module which provides high voltage isolation, very
high reliability and optimum circuit design needing a
minimum of external components.
A number of variants are available to meet particular
country impedance requirements. The D.A.A. has
been designed to meet regulatory approvals
requirements in these countries.
MH88422-1/2/3
MH88422BD-1
26 Pin DIL Package
26 Pin DIL Package
DS5067
ISSUE 10
November 1998
Ordering Informations
0°C to 70°C
Description
Applications
Interface to Central Office or PABX line for:
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•
•
Modem
FAX
Telemetry
Isolation Barrier
VDD
AGND
Opto-
Isolation
Opto-
Isolation
TXIN
TF
RLS
Opto-
Isolation
Opto-
Isolation
Logic Input
Buffer
Audio
Buffer
Audio
Buffer
Ring & Loop
Buffer
Transhybrid
loss
cancellation
circuit
TIP
RING
Input Buffer
&
Line Termination
LC
VR
VX
RVLC
Network Connections
User Connections
Figure 1 - Functional Block Diagram
2-13
MITEL [ MITEL NETWORKS CORPORATION ]
