MH88437-P
Data Access Arrangement
Advance Information
Features
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FAX and Modem interface (V.34/V.34+)
Designed to work at data rates up to 56kbits
External 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
+5V operation, low on-hook power (25mW)
Full duplex voice and data transmission
On-Hook reception from the line
Meets French current limit requirements
Conforms to German dial pulse standards
Approvable to UL 1950
Industrial Temperature Range Available
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DS5060
ISSUE 4
October 1998
Package Information
MH88437AD-P 28 Pin DIL Package
MH88437AS-P 28 Pin SM Package
0˚C to 70˚C
MH88437AD-PI Ind. Temp. DIL Variant
-40˚C to +80˚C
MH88437AS-PI Ind. Temp. SM Variant
-40˚C to + 80˚C
Telemetry
Set Top Boxes
Description
The Mitel MH88437 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
• Electronic Point of Sale
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Security System
Isolation Barrier
VCC
VBIAS
AGND
CL
LC
VR+
VR-
NB1
NB2
THL cancellation
and line
impedance
matching circuit
VX
ZA
RV
LCD
LOOP
RS
Opto-
Isolation
TIP
RING
Input Buffer
&
Line Termination
Logic Input
Buffer
Isolation
Analog
Buffer
VLOOP1
VLOOP2
Isolation
Analog
Buffer
Ring & Loop
Buffer
Isolation
Network Connections
User Connections
Figure 1 - Functional Block Diagram
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MITEL [ MITEL NETWORKS CORPORATION ]
