The SSM2141SZ is an integrated Differential Amplifier intended to receive balanced line inputs in audio applications requiring a high level of noise immunity and optimum common-mode rejection. The differential line receiver typically achieves 100dB of common-mode rejection (CMR), whereas implementing an op amp with four off-the-shelf precision resistors will typically achieve only 40dB of CMR-inadequate for high-performance audio. The SSM2141SZ achieves low distortion performance by maintaining a large slew rate of 9.5V/µs and high open-loop gain. Distortion is less than 0.002% over the full audio bandwidth. The SSM2141SZ complements the SSM2142 balanced line driver. Together, this device comprises a fully integrated solution for equivalent transformer balancing of audio signals without the problems of distortion and EMI fields. Additional applications for the SSM2141SZ include summing signals, differential preamplifiers and 600R low distortion buffer amplifiers.

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