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ADAU1361, ADAU1761 - Common-Mode Rejection Ratio for differential inputs and additional input’s differential buffer

Question asked by Sasa on Jun 27, 2012
Latest reply on Jun 27, 2012 by Sasa


In datasheet parameter “Common-Mode Rejection Ratio” for differential inputs is 65dB. The same parameter for fully-differential op-amplifier (OPA1632, for example) is 90 (>74)dB. Really, this parameter for fully-differential op-amplifier will worse because of using 1% resistors in feedback dividers. How much – I don’t know… What is better – is use or no use additional input’s differential buffer?

I will use ADAU1361/ADAU1761 for receive balanced audio (XLR) 600 Ohm on differential inputs LINP/LINN and RINP/RINN.