MH88524
®
Dual 2-4 Wire Circuit
Preliminary Information
Features
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Full duplex operation
Two complete circuits per package
Transformerless 2-4 Wire (4-2 Wire) conversion
+ 5V operation
Wide bandwidth (50kHz)
Small Package Size
MH88524
ISSUE 4
April 1995
Ordering Information
10 Pin SIL Package
0°C to 70°C
Description
The Mitel MH88524 (Dual 2-4 wire Circuit) provides
two independent interfaces between4-Wire devices
such as the MH88631 COIC (Central Office Interface
CIrcuit) and a speech switch such as the MT8814
(Analog Switch Array), requiring only a single
bidirectional switch per crosspoint. The MH88524
can accommodate two full duplex audio links. The
device is fabricated as a thick film hybrid which
incorporates various technologies for optimum circuit
design and very high reliability.
Applications
4-2 Wire and 2-4 Wire conversion for:
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MH88630/631, MH88632, MH88500 & MT8840
PBX
Key Telephone System
Channel bank
Voice Mail
Terminal Equipment
Digital Loop Carrier
Modem
Intercom
RX1
Receive Gain
Circuit1
2-4 Wire
Circuit 1
JUN1
TX1
Transmit Gain
Circuit 1
RX2
Receive Gain
Circuit 2
2-4 Wire
Circuit 2
JUN2
TX2
Transmit Gain
Circuit 2
VDD
VEE
AGND
Figure 1 - Functional Block Diagram
2-73
MITEL [ MITEL NETWORKS CORPORATION ]
