MH88422-1 Datasheet, PDF (1/14 Pages) Mitel Networks Corporation – 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
Applications
Interface to Central Office or PABX line for:
• Modem
• FAX
• Telemetry
DS5067
MH88422
Data Access Arrangement
Preliminary Information
ISSUE 10
November 1998
Ordering Informations
MH88422-1/2/3 26 Pin DIL Package
MH88422BD-1 26 Pin DIL Package
0°C to 70°C
Description
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.
TIP
RING
TXIN
TF
RLS
Isolation Barrier
Input Buffer
&
Line Termination
Opto-
Isolation
Logic Input
Buffer
Opto-
Isolation
Audio
Buffer
Opto-
Isolation
Audio
Buffer
Opto-
Isolation
Ring & Loop
Buffer
Transhybrid
loss
cancellation
circuit
Network Connections
User Connections
Figure 1 - Functional Block Diagram
VDD
AGND
LC
VR
VX
RVLC
2-13