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The SSM2143 is an integrated differenTIal amplifier intended toreceive balanced line inputs in audio applicaTIons requiring ahigh level of immunity from common-mode noise. The deviceprovides a typical 90 dB of common-mode rejecTIon (CMR),which is achieved by laser trimming of resistances to better than0.005%.AddiTIonal features of the device include a slew rate of 10 V/msand wide bandwidth. Total harmonic distortion (THD) is lessthan 0.004% over the full audio band, even while driving lowimpedance loads. The SSM2143 input stage is designed tohandle input signals as large as +28 dBu at G = 1/2. Althoughprimarily intended for G = 1/2 applications, a gain of 2 can berealized by reversing the +IN/–IN and SENSE/REFERENCEconnections.When configured for a gain of 1/2, the SSM2143 and SSM2142Balanced Line Driver provide a fully integrated, unity gainsolution to driving audio signals over long cable runs. Forsimilar performance with G = 1, see SSM2141.
