Description

The Zarlink 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, 2 W to 4 W 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.

Features

• Transformerless 2 W to 4 W 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

• -22 V to -72 V battery operation

Applications

Line interface for:

• PABX/ONS

• Intercoms

• Key Telephone Systems

• Control Systems