Phase compensated 8-Ch multiplexed data acquisition system for power automation

This TI Verified Design provides the theory, component selection, TINA-TI simulations, Verification & Measurement Performance, Altium Schematics, PCB Layout for a Phase Compensated 8-Ch Multiplexed Data Acquisition System for Power Automation.  The design uses a 16-bit, 8-Channel, 500ksps SAR ADC, ADS8688 with integrated analog front-end circuit for ease of system hardware design.

The design introduces the concept of phase and phase Compensation, compares the additional phase delay introduced between the input channels of a non-simultaneous sampling ADC with a simultaneous sampling ADC, and provides a optimal algorithm to compensate for the phase delay introduced in a non-simultaneous implementation.
Measured results demonstrate how the phase compensation algorithm used in this design compensates for the additional phase delay introduced by a multiplexed ADC, resulting in an equivalent performing solution as compared to a simultaneous sampling ADC solution.

Features
• Verified Design Contains Theory, Component Selection, TINA-TI Simulation, Verification & Measured Performance, Altium Schematics and PCB Layout
• ADS8688: 16-Bit, 500-kSPS,  8-Channel, Single-Supply, SAR ADC with Multiplexed and Bipolar Input
• Single-ended sinusoidal input with amplitude of = ±10V and typical = 50 Hz
• 0.002036 degree compensated phase difference

Parts Include:
ADS8684 SAR ADC with 16 bits, 4 channels, 500 kSPS, and bipolar inputs off +5V supply
ADS8688 SAR ADC with 16 bits, 8 channels, 500 kSPS, and bipolar inputs off +5V supply 

Learn more by downloading the reference design below