MT91600 Datasheet, PDF (1/16 Pages) Mitel Networks Corporation – Programmable SLIC

Features
• 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
Applications
Line interface for:
• PABX/ONS
• Intercoms
• Key Telephone Systems
• Control Systems
MT91600
Programmable SLIC
Preliminary Information
DS5057
ISSUE 7
Package Information
August 1999
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.
X3 X2
X1
TD
TF
TIP
RING
RF
C3A
C3B
RV
RD
Tip Drive
Controller
Line Sense
Over-Current
Protection Circuit
Ring Drive
Controller
Audio Gain & Network
Balance Circuit
2 W to 4 W
Conversion & Line
Impedance
Loop Supervision
Relay
Driver
IC
VREF SHK C1 C2A C2B
VDD GND VEE
Figure 1 - Functional Block Diagram
VX
VR
Z3
Z2
Z1
RLYC
RLYD
1