MT91610
Programmable Ringing SLIC
Preliminary Information
DS5181
ISSUE 6
July 2001
Features
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Transformerless 2W to 4W conversion
Controls battery feed to line
Package Information
Programmable line impedance
Programmable network balance impedance
Off-hook and dial pulse detection
Protects against GND short circuit
Programmable gain
MT91610AQ
36 Pin QSOP Package
-40°C to +85°C
Programmable constant current mode with
constant voltage fold over
Description
The Zarlink MT91610, with an external bipolar driver
(Figure 4), provides an interface between a switching
system and a subscriber loop. The functions
provided by the MT91610 include battery feed,
programmable constant current with constant
voltage fold over for long loops, 2W to 4W
conversion, off-hook and dial pulse detection, direct
balance ringing with built in ring tripping, unbalance
detection, user definable line and network balance
impedance’s and gain, and power down and wake
up. The device is fabricated as a CMOS circuit in a
36 pin QSOP package.
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Transformerless balanced ringing with
automatic ring trip circuit. No mechanical relay
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Supports low voltage ringing
Line polarity reversal
On-hook transmission
Power down and wake up capability
Meter pulse injection
Ground Key detection
Applications
Line interface for:
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PABX
Intercoms
Key Telephone Systems
Control Systems
PD
RV RC
GTX1 ESE
ESI GTX0
Ringing
Controller
Audio Gain & Network
Balance Circuit
Tip Drive
TD
VX
VR
Controller
TF
TIP
RING
RF
Z3
Z2
Line Sense
2 W to 4 W
Conversion & Line
Impedance
Z1
CP5
Over-Current
Protection Circuit
LR
Line
Reverse
Driver
Ring Drive
Controller
Loop Supervision
RD
CP7
CP4 CP6
Figure 1 - Functional Block Diagram