MH88622 Datasheet, PDF (1/10 Pages) Mitel Networks Corporation – DUAL OPS SLIC Preliminary Information

MH88622
®
DUAL OPS SLIC
Preliminary Information
Features
• 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
Applications
• Pair Gain
• CT2
• Cordless local loops
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
220Ω + (820Ω // 115nF)
-2
600Ω
-3
370Ω + (620Ω // 310nF)
-5
200Ω + (680Ω // 100nF)
SHK1
LCS1
LCS2
SHK2
LR1
TIP1
RING1
VX1
VR1
ESI1
ESE1
Loop
Supervision
Line Drivers/
Feed
2-4 Wire
Conversion
Over Current
Protection &
Constant
Current Feed
Over Current
Protection &
Constant
Current Feed
Ring Generator
Loop
Supervision
Line Drivers/
Feed
2-4 Wire
Conversion
VDD VEE AGND VBat DCRI RC1 RF1 RF2 RGV RG1 RC2
Figure 1 - Functional Block Diagram
LR2
TIP2
RING2
VX2
VR2
ESI2
ESE2
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