Phase Compensated 8-Ch Multiplexed Data Acquisition System for Power Automation Reference Design


Design files


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.

  • 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
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDC524A.ZIP (59715 K)

Detailed schematic diagram for design layout and components

TIDR921A.PDF (720 K)

Detailed schematic diagram for design layout and components

TIDR922A.PDF (144 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDC525.ZIP (4433 K)

Design file that contains information on physical board layer of design PCB


Includes TI products in the design and potential alternatives.

Precision ADCs

ADS868416-Bit, 500-kSPS, 4-Ch SAR ADC w/ programmable (±10/±5/±2.5V) input ranges on +5V supply

Data sheet: PDF | HTML
Precision ADCs

ADS868816-bit, 500-kSPS, 8-channel, single-supply SAR ADC with bipolar input ranges

Data sheet: PDF | HTML

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Technical documentation

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* User guide Phase-Compensated 8-Ch Multiplexed Data Acquisition System for Power Automation (Rev. B) Mar. 12, 2015

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