Design Support

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In this application note we will do a system noise analysis of the PGA900 connected to a resistive bridge pressure sensor. First, we will measure the noise referred to the output for the PGA900. Then, using these measurement results we will calculate the noise-free resolution and effective resolution of the PGA900 for its analog-to-digital converter operating at 64- and 128-µs output data rates and different gain setups. Next, we will summarize the trend between the output resolution and the signal bandwidth when an additional moving average filter is applied. Finally, we will prove that an increase in resolution is minimal for gains set up greater than 80 V/V.