®
MH88622
DUAL OPS SLIC
Preliminary Information
Features
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•
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•
•
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•
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•
•
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Dual SLIC
Ringing generation
On-hook transmission
Transformerless 2-4 wire conversion
Constant current feed
Battery Feed to the line
Tip Ring reversal capability
Over current protection
Off-Hook detection
Logic interface for SHK, RC, LR, ESE, LCS
Metering injection
Wide V
Bat
operating range
Minimum installation space
ESE ramped output
ISSUE 3
April 1995
Ordering Information
MH88622 -1, -2, -3,-5
40 Pin SIL Package
0°C to 70°C
Description
The Mitel MH88622 is a Dual Subscriber Interface
Circuit which provides a complete interface between
the telephone lines a dual codec, requiring a dual rail
supply, battery and dc supply for ringing generation.
The functions provided by the MH88622 includes 2-4
Wire conversion, constant current line feed,
signalling and control. The SLIC manufactured using
thick film hybrid technology which offers high voltage
capability, reliability and high density resulting in a
significant area saving on the printed circuit board. A
complete C.O. type solution can be implemented
with minimal external components. Different variants
are provided to meet different country line
impedance, they are:
-1
-2
-3
-5
220Ω + (820Ω // 115nF)
600Ω
370Ω + (620Ω // 310nF)
200Ω + (680Ω // 100nF)
Applications
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•
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Pair Gain
CT2
Cordless local loops
SHK1
LCS1
LCS2
SHK2
Loop
Supervision
Over Current
Protection &
Constant
Current Feed
Over Current
Protection &
Constant
Current Feed
Loop
Supervision
LR1
TIP1
RING1
VX1
VR1
ESI1
ESE1
Line Drivers/
Feed
Line Drivers/
Feed
LR2
TIP2
RING2
2-4 Wire
Conversion
Ring Generator
2-4 Wire
Conversion
VX2
VR2
ESI2
ESE2
VDD VEE AGND
VBat DCRI RC1 RF1 RF2 RGV RG1 RC2
Figure 1 - Functional Block Diagram
2-173
MITEL [ MITEL NETWORKS CORPORATION ]
