The THAT 1606 and 1646 are a new generation of monolithic differential line drivers offering improved performance over conventional cross-coupled designs. Based on a high-performance, fully differential op amp and laser-trimmed thin-film resistors, both families exhibit low noise and distortion, high slew rate, and wide output swing. The parts are stable when driving difficult loads, and have short-circuit protected outputs. Both models incorporate THAT's patented OutSmarts technology. Outsmarts is a dual feedback-loop design that prevents the excessive ground currents typical of cross-coupled output stages (CCOS) when clipping into single-ended loads. The 1646 is pin-compatible with the TI DRV134 and DRV135, as well as the Analog Devices SSM2142. The unique 1606 offers differential inputs, a space-saving connection to minimize output dc offset, and comes in a special 16-pin QSOP which improves power dissipation without sacrificing footprint.