®
MH88625
DID/OPS SLIC
Preliminary Information
Features
•
•
•
•
•
•
•
•
•
•
•
Programmable gain, network balance and
impedance
Transformerless 2-4 wire conversion
Constant current with constant voltage fallback
for long loop capability
Pin compatible with MH88632 and MH88628
Unbalance detection (Tip, Ring ground sensing)
Auto ring trip
On-Hook transmission (ANI) capability
Compatible with requirements of CCITT,
DOC/FCC and CSA/UL
Excellent power dissipation (SIL vertical
mounting)
12/16kHz meter pulse injection control
Solid State TIP/RING reversals
MH88625
ISSUE 6
April 1995
Ordering Information
40 Pin SIL Package
0°C to 70°C
Description
The Mitel MH88625 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 MH88625 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.
Applications
•
•
•
On/Off Premise PBX Line Cards
DID (Direct Inward Dial) Line Cards
Central Office Line Cards
VBat
LGND
LCA
VDD
VEE
AGND
RING
RF1
RF2
TIP
TF1
TF2
Matched
Feed
Resistors
Driver
Circuitry
And
Speech
Circuit
Loop
Current
Set
Switch-hook
Threshold Set
Ring
Filter
Switch-hook
Detect
SHK
NS
N1
N2
NATT
UD
Unbalance
Detection
Impedance
Network
2-4 Wire
Conversion
RNGC
RGND
VRLY
Ring
Relay
Driver
Tip/Ring
Reversal
External
Signal
Input
Gain Adjust
RRD
REVC
ESI
ESE
Z900 Z600 Z1
Z2
GRX1 GRX0 RX GTX1 GTX0 TX
FIgure 1 - Functional Block Diagram
2-183
MITEL [ MITEL NETWORKS CORPORATION ]
