Introduces how to design the driving circuit of low noise, low distortion, 16-bit, 1Msps SAR ADC.
The article discusses designing a driving topology for the LTC2393-16 SAR ADC to deliver uncompromising performance in data acquisition systems. It presents two specific circuit solutions: one converting single-ended signals to differential, and another providing AC-coupled fully differential drive for low impedance sensors.
The circuit converts a single-ended signal ranging from 0V to 4.096V into a differential ±4.096V signal.
Resistors and a capacitor in the circuit limit the input bandwidth to approximately 100kHz.
The lower frequency limit of this AC-coupled circuit is about 10kHz.