MH89626C Datasheet, PDF (1/12 Pages) Mitel Networks Corporation – OPS/DID SLIC Preliminary Information

MH89626C
®
OPS/DID SLIC
Preliminary Information
Features
• Transformerless 2-4 wire conversion
• Constant current with constant voltage fallback
for long loops
• Long length capability (R_Loop > 1850Ω)
• Input impedance
• 200Ω + 560Ω // 0.1µF (MH89626C-02)
• 200Ω + 680Ω // 0.1µF (MH89626C-04)
• Ring trip filter with auto ring trip
• Three relay drivers
• Built-in Tip/Ring reversal capability on the
hybrid
• Serial control interface
• External or software programmable receive
gain, -3.5 or -7.0dB
Applications
• Off-Premise PBX Line Cards
• DID (Direct Inward Dial) Line Cards
• Central Office Line Cards
ISSUE 3
May 1995
Ordering Information
MH89626C-02
MH89626C-04
38 Pin SIL Package
38 Pin SIL Package
0°C to 70°C
Description
The MH89626C 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 MH89626C is manufactured
using thick film hybrid technology which offers high
voltage capability, reliability and high density
resulting in significant printed circuit board area
saving of the line cards. A complete line card can
be implemented with very few external
components.
The SLIC has a simple serial control interface to
control the receive gain setting, relay drivers for
ringing, and Tip/Ring reversal for DID operation.
TF
TIP
RING
RF2
RF
VBat
LGND VDD VEE
LCA
AGND RGND
VREF F1i C2i
Tip
Drive
Current
& Voltage
Sensing
Ring
Drive
Constant
Current &
Voltage
Control
2W/4W
Conversion
Gain
Adjust
Tip/Ring
Reversed
MT8967
Do
A-Law
Filter/Codec
Di
GS
SD2
8-Bit
Shift
CS
SD3
Register
SDi
SD0
SD1
SD4
Line
Supervision
Auto Ring
Trip Filter
Relay
Drive 1
Relay
Driver 2
Relay
Driver 3
LED SHK
VAC VRLY
RD1
RD2
RD3 SD5 SD6 SD7
Figure 1 - Functional Block Diagram
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