PCM1754-Q1: How to simulate its SNR by TINA

Hi Zirui,

The actual delta-sigma operation is not easily simulated by TINA, but really the SNR will be dictated by noise.  This device is noise limited, and by that, I mean that the ideal dynamic range is greater than SNR.  The output 4Vpp, or ~1.4VRMS.  Assuming the desired SNR is 105dB, then we can say that our in-band noise must be low enough that the signal/noise is 105dB.  That means Vnoise ≤ 1.4V×10^(-105/20) = 7.9µV.  So the only thing to simulate in TINA would be the noise contribution of the output filters or amplifiers.  In addition, the DAC has limited PSRR capability, so it is worth simulating the power supply noise from your power circuit.  The device's PSRR is basically limited to the filter on the VCOM pin.  The VCOM voltage is created with a resistor divider created by two 42kΩ resistors.  The capacitor on the VCOM pin will create an RC filter where R=21kΩ and C = Cvcom.  

Thanks,
Paul