MH88620IN Datasheet, PDF (1/14 Pages) Mitel Networks Corporation – C.O. SLIC Preliminary Information

MH88620IN
®
C.O. SLIC
Preliminary Information
Features
• 600 ohm input impedance
• Externally selectable network balances
• Transformerless 2-4 wire conversion
• Programmable constant resistance feed
• Off-hook and dial pulse detection
• High immunity to externally induced longitudinal
currents
• Auto ring trip
• On-hook transmission (ANI) capability
• Minimum protection circuitry required
• Compatible with requirements of CDOT DOC/
FCC, CSA/UL,CCITT
• Excellent power dissipation (SIL vertical
mounting)
Applications
• On/Off-Premise PBX Line Cards
• Central Office Line Cards
ISSUE 3
April 1995
Ordering Information
MH88620IN 40 Pin SIL Package
0°C to 70°C
Description
The Mitel MH88620IN SLIC provides all of the
functions required to interface 2-wire off premise
subscriber loops to a serial TDM, PCM, switching
network of a modern PBX. The MH88620IN is
manufactured using thick film hybrid technology
which offers high voltage capability, reliability and
high density resulting in significant printed circuit
board area savings. A complete line card can be
implemented with very few external components.
RING
RF1
RF2
TIP
TF1
TF2
VBat LGND
Matched
Feed
Resistors
Driver
Circuitry
and
Speech
Circuit
Auto Ring
Trip
LCA
VDD VEE AGND
Loop
Current
Set
Switch-Hook
Threshold Set
Switch-Hook
Detect
Ring
Filter
Impedance
Network
2W/4W
conversion
SHK
N1
N2
TRD
Test Relay
Driver
Ring Relay
Driver
Gain Adjust
TRC RGND VRLY RNGC RRD
Z1 Z2 GRX1 GRX0 ^RX GTX1 ^GTX0 TX
Figure 3 - Functional Block Diagram
2-159