MH88520-1 Datasheet, PDF (1/10 Pages) Mitel Networks Corporation – German Subscriber Line Interface Circuit (SLIC) Preliminary Information

MH88520-1
®
German Subscriber Line Interface Circuit (SLIC)
Preliminary Information
Features
• Differential to single ended conversion
• Transformerless 2-2 wire conversion
• Minimum installation space
• Off-Hook detection and LED indicator drive
• Relay drive output
• Battery and ringing feed to line
• Logic interface: MUTE, SHK, RRC
• Mute of incoming audio
• Dial pulse detection
• Voltage surge protection
• German complex input impedance
Applications
Line Interface for:
• Intercoms
• Key Systems
• PABX
ISSUE 4
Ordering Information
April 1995
MH88520-1 20 Pin SIL Package
0°C to 70°C
Description
The Mitel MH88520-1 German Subscriber Line
Interface Circuit provides a complete interface
between the telephone line and a speech switch
requiring only single bidirectional switch per
crosspoint. The functions provided by the
MH88520-1 include bidirectional differential to single
ended conversion in the speech path, line battery
feed, ringing feed and loop and dial pulse detection.
The device is fabricated as a thick film hybrid in a
20-pin ‘single-in-line’ (SIL) package allowing
optimum circuit board packing density and very high
reliability.
TIP (A)
RING (B)
RING FEED 1
RING FEED 2
VRLY
RRD
RRC
RGND
Loop Feed/
Ring Feed
Speech Circuit
Relay Drive
Circuit
Loop Detection
VBAT AGND VDD VEE
Figure 1 - Functional Block Diagram
JUNC
MUTE
SHK
LED
THRESH ADJ
2-63