The VSC7960 is a single 3.3V supply combination limiting amplifier and laser diode driver for SONET/SDH applications up to 3.125Gb/s. The limiting amplifier features Loss of Signal (LOS) detect, output offset correction, and optional output squelch. Laser driver data inputs accept differential PECL signals and the output modulation and bias currents are easily controlled via external components. The laser diode driver Automatic Power Control (APC) loop maintains a constant average optical power over temperature and lifetime. The dominant pole of the APC loop can be controlled with an external capacitor. Other features include enable control, short-circuit protection for the modulation and bias inputs, short rise and fall times, and failure-monitor output to indicate when the APC loop is unable to maintain the average optical power. The VSC7960 is available in die form or in a 48-pin TQFP package. The VSC7962 provides similar features to the VSC7960 but the limiting amplifier has PECL outputs.