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)

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Bill of Materials (BOM)

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TI Devices (23)

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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 Sampling Delta-Sigma ADC for Power Monitoring & 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  ±250mV-Input, Basic Isolated Amplifier for Current Sensing  Special function amplifiers  Sample & Buy View Design Kits & Evaluation Modules
AMC1300  Reinforced Isolated Amplifier for Current Sensing  Special function amplifiers  Sample & Buy View Design Kits & Evaluation Modules
AMC1301  Precision Reinforced Isolated Amplifier for Current Sensing  Special function amplifiers  Sample & Buy View Design Kits & Evaluation Modules
AMC1311  2V Input, Reinforced Isolated Amplifier With High CMTI for Voltage Sensing  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
ISO224  ±12V reinforced isolated amplifier for voltage sensing  Special function amplifiers  Sample & Buy View Design Kits & Evaluation Modules
LM27762  Low-Noise Positive- and Negative-Output Charge Pump With Integrated LDO  DC/DC switching regulators  Sample & Buy View Design Kits & Evaluation Modules
LM4040-N  100ppm/C Precision Micropower Shunt Voltage Reference  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
OPA4171  36V, Low Power, RRO, General Purpose Operational Amplifier  Operational amplifiers (op amps)  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
REF3425  2.5V Low-Drift Low-Power Small-Footprint Series Voltage Reference  Voltage references  Sample & Buy Not Available
REF3440  4.1V Low-Drift Low-Power Small-Footprint Series Voltage Reference  Voltage references  Sample & Buy Not Available
SN6501  Low-Noise 350 mA, 410 kHz Transformer Driver for Isolated Power Supplies  Isolation  Sample & Buy View Design Kits & Evaluation Modules
TLV704  24V Input Voltage, 150mA, Ultra-Low-Iq Low-Dropout (LDO) Regulators  Power management  Sample & Buy View Design Kits & Evaluation Modules
TLV9061  World's Smallest Amp 10MHz, RRIO, 1.8V-5.5V op-amp delivers high performance for challenging systems  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
TPS60403  60mA Charge Pump Voltage Inverter with Fixed 250kHz Operation  DC/DC switching regulators  Sample & Buy View Design Kits & Evaluation Modules
TPS717  150mA, High PSRR, Low Quiescent Current, Low Noise LDO  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS723  200mA Negative-Output Low-Dropout (LDO) Linear Regulator  Power management  Sample & Buy Not Available
TVS0500  5V Flat-Clamp Surge Protection Device  Circuit protection  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ADS131A02 Download
ADS131A04 Download Download
ADS131E08 Download Download
ADS131E08S Download
AMC1200 Download Download
Download
AMC1300 Download
AMC1301 Download -
AMC1311 Download Download
CDCLVC1102 Download Download
LM27762 Download
LM4040-N Download Download
Download Download
Download Download
OPA4171 Download Download
Download Download
OPA4180 Download
Download
REF3425 Download Download
REF3440 Download Download
SN6501 Download Download
TLV704 Download Download
TLV9061 Download
Download Download
TPS60403 Download Download
TPS717 Download Download
Download Download
Download Download
TPS723 Download Download
TVS0500 Download Download

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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 3164 26 Sep 2018 20
Design files (6)
Title Abstract Type Size (KB) Date Views
ZIP 3194 05 Sep 2018 1 1
PDF 3747 05 Sep 2018 1 1
ZIP 926 05 Sep 2018 1 1
PDF 112 05 Sep 2018 1 1
PDF 904 05 Sep 2018 13
ZIP 962 05 Sep 2018 1 1

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