MH88435-P
Data Access Arrangement
Preliminary Information
Features
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FAX and Modem interface V.34(33k6)
Externally programmable line and network
balance impedances
Programmable DC termination characteristics
IEC950 recognised component
Transformerless 2-4 Wire conversion
Integral Loop Switch
Dial Pulse and DTMF operation
Accommodates parallel phone detection
Line state detection outputs:-
loop current/ringing voltage/line voltage
Single +5V operation, low on-hook power
(35mW)
Full duplex voice and data transmission
On-Hook reception from the line
Approvable to UL1950
Industrial temperature range available
DS5132
ISSUE 8
July 1999
Package Information
MH88435AD-P
28 Pin DIL Package
MH88435AS-P
28 Pin SM Package
0°C to +70°C
MH88435AS-PI
28 Pin SM Package
MH88435AD-PI
28 Pin DIL Package
-40°C to +85°C
Description
The Mitel MH88435 Data Access Arrangement
(D.A.A.) provides a complete interface between
audio or 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.
The impedance and network balance are externally
programmable, as are the DC termination
characteristics, making the device suitable for most
countries worldwide.
Applications
Interface to Central Office or PABX line for:
• FAX/Modem (including software modems)
• Electronic Point of Sale
• Security System
• Telemetry
• Set Top Boxes
Isolation Barrier
VCC
VBIAS
AGND
LC
TIP
RING
Input Buffer
&
Line Termination
Isolation
Analog
Buffer
VR+
VR-
NB1
NB2
THL cancellation
and line
impedance
matching circuit
VX
ZA
RV
LCD
LOOP
RS
Network Connections
User Connections
Opto-
Isolation
Logic Input
Buffer
Isolation
VLOOP1
VLOOP2
Isolation
Analog
Buffer
Ring & Loop
Buffer
Figure 1 - Functional Block Diagram
2-39
MITEL [ MITEL NETWORKS CORPORATION ]
