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MH88520-1

Part Number	MH88520-1
Manufacturer	Mitel Networks
Description	German Subscriber Line Interface Circuit (SLIC) Preliminary Information
Published	Apr 27, 2005
Detailed Description	® MH88520-1 German Subscriber Line Interface Circuit (SLIC) Preliminary Information Features • • • • • • • • • • • Dif...
Datasheet	MH88520-1 PDF File

Overview

® 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 MH88520-1 ISSUE 4 April 1995 Ordering Information 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.
Applications Line Interface for: • • • Intercoms Key Systems PABX TIP (A) RING (B) RING FEED 1 RING FEED 2 Loop Feed/ Ring Feed JUNC Speech Circuit MUTE VRLY SHK RRD RRC RGND Loop Detection Relay Drive Circuit LED THRESH ADJ VBAT AGND VDD VEE Figure 1 - Functional Block Diagram 2-63 MH88520-1 Preliminary Information TIP IC RING RF1 IC RF2 IC VEE LED SHK THRESH ADJ VDD AGND VBAT MUTE JUNC RRD RGND RRC VRLY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Figure 2 - Pin Connections Pin Description Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Name TIP IC RING RF1 IC RF2 IC VEE LED SHK THRESH ADJ VDD AGND VBAT MUTE JUNC RRD RGND RRC VRLY Description Tip Lead.
Connects to the “Tip” lead (A-wire) of the telephone line.
Internal Connection.
Leave open circuit.
Ring Lead.
Connects to the “Ring” lead (B-wire) of the telephone line.
Ring Feed 1.
Connect to the Ring Relay co...

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MH88520-1 German Subscriber Line Interface Circuit (SLIC) Preliminary Information - Mitel Networks

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