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AD820 as ADC driver

Question asked by ezmbi on Oct 5, 2015
Latest reply on Nov 5, 2015 by ezmbi


In a typical photodiode analog front-end application, a AD820 is used as a transimpedance amplifier and a second one as inverter and  ADC driver. The 3-dB bandwidth is about 7 kHz. The ADC used to have 12-bit resolution, but it is going to be replaced by a 16-bit SAR.

However, the applications part of the AD820 datasheet reads : "12-bit to 14-bit data acquisition systems". Does its THD of  -93 dB absolutely rule out a 16-bit ADC?

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