High Accuracy ±0.5% Current and Isolated Voltage Measurement Ref Design Using 24-Bit Delta-Sigma ADC

(ACTIVE) TIDA-00835

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Key Document

Description

The TIDA-00835 reference design allows for accurate voltage and current measurement using a bipolar input configuration by incorporating a four- channel, 24-bit simultaneously-sampling differential input Delta-Sigma ADC over wide dynamic range. The ADC is configured to measure ±2.5 V bipolar input.  The inputs are scaled to ADC measurement range of ±2.5V using a fixed gain amplifier. This AFE chains two ADCs together using a common external clock to expand the number of input channels to eight while simultaneously sampling all of the input channels. By having more measurement channels per module, overall system cost is reduced.

Features
  • Precision data acquisition over wide input range using 4-channel, simultaneous sampling, 24-Bit ∑-∆ ADCs
  • Channel expansion by chaining multiple devices and simultaneous sampling by synchronizing with a buffered common clock
  • Current measurement – performance verified using current transformer or Rogowski coil with hardware integrator
  • Voltage measurement – performance verified using potential divider (PD) without and with an isolation amplifier (basic or reinforced isolation)

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.


  




TI Devices (14)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS131A02  24-Bit, 128kSPS, 2-Ch, Simultaneous Sampling, Delta-Sigma ADC  Analog-to-Digital Converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
ADS131A04  24-Bit, 128kSPS, 4-Ch, Simultaneous-Sampling Delta-Sigma ADC  Analog-to-Digital Converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
ADS131E08  24-Bit, 64kSPS, 8-Ch (Simultaneous) Delta-Sigma ADC for Power Monitoring, Control and Protection  Analog-to-Digital Converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
ADS131E08S  8-24-Bit, 64kSPS, 8-Ch (Simultaneous) Delta-Sigma ADC w/ Fast Start-Up for Monitoring and Protection  Analog-to-Digital Converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
AMC1200  Precision, ±250mV Input, Basic Isolated Amplifier  Special Function Amplifiers  Sample & Buy View Design Kits & Evaluation Modules
AMC1301  Precision, ±250mV Input, 3µs Delay, Reinforced Isolated Amplifier  Special Function Amplifiers  Sample & Buy View Design Kits & Evaluation Modules
CDCLVC1102  Low Jitter, 1:2 LVCMOS Fan-out Clock Buffer  Clock Buffers  Sample & Buy View Design Kits & Evaluation Modules
LM4040-N  Precision Micropower Shunt Voltage Reference  Voltage Reference  Sample & Buy View Design Kits & Evaluation Modules
OPA4180  0.1 uV/C Drift, Quad, Low Noise, Rail-to-Rail, 36V Zero Drift Op Amp  Operational Amplifiers (Op Amps)  Sample & Buy View Design Kits & Evaluation Modules
SN6501  Low-Noise 350 mA, 410 kHz Transformer Driver for Isolated Power Supplies  Isolation  Sample & Buy View Design Kits & Evaluation Modules
TLV704  24-V Input Voltage, 150-mA, Ultralow IQ Low-Dropout Regulators  Linear Regulator (LDO)  Sample & Buy View Design Kits & Evaluation Modules
TPS60403  60mA Charge Pump Voltage Inverter with Fixed 250kHz Operation  Buck/Boost, Inverting or Split-Rail  Sample & Buy View Design Kits & Evaluation Modules
TPS717  150mA, High PSRR, Low Quiescent Current, Low Noise LDO  Linear Regulator (LDO)  Sample & Buy View Design Kits & Evaluation Modules
TPS723  200mA, Negative Output Low-Dropout Linear Regulator  Linear Regulator (LDO)  Sample & Buy Not Available

Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 2825 15 Nov 2016 1,077
Design files (6)
Title Abstract Type Size (KB) Date Views
ZIP 1192 07 Jul 2016 101
ZIP 2327 07 Jul 2016 75
PDF 6776 07 Jul 2016 58
ZIP 1299 07 Jul 2016 53
PDF 168 07 Jul 2016 80
PDF 2316 07 Jul 2016 462


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