STLC1512

 Low power architecture -- Class AB, current drive, output stage through a centre tapped transformer to facilitate power supply switching between 5.0V and a lower voltage. (3.3V in the reference design) This gives a reduction in power consumption.
480mW power consumption with a typical G.lite signal.
600mA current driving capability
Positive +5.0V and one lower supply. (3.3V in the reference design)
Switching power supplies to save power
Thermal overload shutdown
Four programmable receive gains
Opamp for a low pass filter in the receive path
Undedicated opamp with separate power down control (used as a transmit path filter in the reference design)
Separate power down control for Tx and Rx path
48-pin TQFP (7x7x1.4mm) package

The STLC1512 G.lite line driver chip contains the line driver as well as part of the receive path required in a central office G.lite modem. It provides an interface between the AFE chip (STLC1512) and the telephone line. The line driver chip has been designed with low power consumption, high signal to noise plus distortion ratio and high current driving capability.

The line driver transmit path contains a preamplifier followed by a power output stage. The power stage has current outputs that directly drive the primary side of a center tapped transformer.

The receive path contains a programmable gain amplifier followed by an opamp which is used with off STLC1512 passive components in an active low pass filter.The Programmable Grain Amplifier (PGA) has four steps optimized for the recommended G.lite CO line interface.

There is also an undedicated opamp which can be used for active filtering in either the transmit or receive paths