MH88614 Datasheet, PDF (1/10 Pages) Mitel Networks Corporation – Programmable CODEC SLIC Advance Information

MH88614
®
Programmable CODEC SLIC
Advance Information
Features
• Transformerless 2-wire to 4-wire conversion
• Battery Feed
• Ringing & Messaging Facility
• Power Down with Wake Up output
• Automatic Ring Trip
• Programmable Constant Current
• Earth Ground Button detection
• Switch Hook detection
• Interface for a programmable CODEC
• Ring ground over-current protection
• Impedance reflection
• Loop Length Indication
Applications
Line Interface for
• PABX
• Intercoms
• Key Telephone Systems
• Control Systems
ISSUE 2
Ordering Information
MH88614 30 Pin SIL Package
April 1995
0°C to 70°C
Description
The SLIC provides a complete interface between an
industry standard programmable CODEC or DSP
and a subscriber loop.
Functions provided include battery feed, zero
crossing ring control, programmable current feed,
power down with wake up signal, cadenced
messaging facility, switch hook & dial pulse
detection, loop length indication and the capability of
reflecting a programmable CODEC’s impedance or
supplying a standard 600 ohm impedance to the line.
The device is fabricated as a thick film hybrid using
various technologies for optimum circuit design high
reliability.
VX
VR
Loop
SHK
EGB
LA
WU
LCA
RE
MSE
PD
2W-4W
Converter
Loop
Supervision
Switch
Circuits
Line Drivers
&
Battery Feed
Constant
Current
Control
V_MSG V_RNG V_EE V_DD ^VBAT ^AGND ^BGND
Figure 1 - Functional Block Diagram
TIP
RING
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