Dual Channel Data Acquisition System for Optical Encoders, 12 Bit, 1MSPS

TI Precision Verified Design provides theory, component selection, simulation, PCB design, and measurement details for a 12-bit 1-MSPS single supply dual channel simultaneous data acquisition system. This circuit achieves 73 dB SINAD for a 4.5 V differential signal at 2 KHz input frequency. Differential input may have a wide range of common mode voltage. Circuit includes a low impedance buffer, low pass RC filter and 12 bit, Dual, Simultaneous Sampling SAR ADC with internal reference voltage source