STLC1511

 Wide transmit (~80dB) and receive (~69dB) dynamic range to limit the external filtering requirements for extended loop reach operation
Programmable tx gain: 0 ÷ -32dB in 2dB steps
14-bit D/A converter in transmit path
Programmable rx gain: 0 ÷40dB in 0.5dB steps
12-bit A/D converter in receive path
Integrated phase-locked loop with an externall LC or crystal oscillator
Low power: 300mW @ 5.0V
64-pin TQFP package

The STLC1511 G.lite Analog Front End (AFE) chip implements the analog transceiver functions required in both a central office modem and a customer premise modem. It connects the digital modem chip with the loop driver and hybrid balance circuits. The STLC1511 has been designed with excellent dynamic range in order to greatly reduce the external filtering requirements at the front end. The AFE chip and its companion digital chip along with a loop driver, implement the complete G.992.2 DMT modem solution.
 
The STLC1511 transmit path consists of a 14-bit Nyquist rate D/A converter, followed by a programmable gain amplifier (TxPGA). The transmit gain is programmable from 0 to -32dB in 2dB steps.

The STLC1511 receive path contains a buffer amplifier followed by a programmable gain amplifier (RxPGA),a low pass anti-aliasing filter, and a 12-bit Nyquist rate A/D converter. The RxPGA is digitally programmable from 0 to 40dB in 0.5dB steps.