MT91600
Programmable SLIC
Preliminary Information
Features
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Transformerless 2W to 4W conversion
Controls battery feed to line
Programmable line impedance
Programmable network balance impedance
Off-hook and dial pulse detection
Ring ground over-current protection
Programmable gain
Programmable constant current feed
-22V to -72V battery operation
DS5057
ISSUE 7
August 1999
Package Information
MT91600
28 Pin SSOP Package
-40°C to +85°C
Description
The Mitel MT91600 provides an interface between a
switching system and a subscriber loop, mainly for
short loop SLIC applications. The functions provided
by the MT91600 include battery feed, programmable
constant current, 2W to 4W conversion, off-hook and
dial pulse detection, user definable line and network
balance impedance’s and the capability of
programming the audio gain externally. The device is
fabricated as a CMOS circuit in a 28 pin SSOP
package.
Applications
Line interface for:
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PABX/ONS
Intercoms
Key Telephone Systems
Control Systems
X3
X2
X1
TD
Tip Drive
Controller
Audio Gain & Network
Balance Circuit
VX
VR
TF
TIP
RING
RF
C3A
C3B
RV
RD
Over-Current
Protection Circuit
Relay
Driver
Ring Drive
Controller
Loop Supervision
Line Sense
2 W to 4 W
Conversion & Line
Impedance
Z3
Z2
Z1
RLYC
RLYD
IC
VREF
SHK
C1
C2A
C2B
VDD GND VEE
Figure 1 - Functional Block Diagram
1
MITEL [ MITEL NETWORKS CORPORATION ]
