High Accuracy ±0.5% Current and Isolated Voltage Measurement Ref Design Using 24-Bit Delta-Sigma ADC TIDA-00835 (ACTIVE)

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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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TI Devices (23)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS131A02  24-bit 128-kSPS 2-channel simultaneous-sampling delta-sigma ADC  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
ADS131A04  24-bit 128-kSPS 4-channel simultaneous-sampling delta-sigma ADC  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
ADS131E08  24-bit 64-kSPS 8-channel simultaneous-sampling delta-sigma ADC for power monitoring and protection  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
ADS131E08S  24-bit 64-kSPS 8-ch simultaneous delta-sigma ADC with fast start-up for monitoring and protection  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
AMC1200  ±250 mV-Input Basic Isolated Amplifier for Current Sensing  Isolation  Sample & Buy View Design Kits & Evaluation Modules
AMC1300  ±250 mV-Input Reinforced Isolated Amplifier with High CMTI for Current Sensing  Isolation  Sample & Buy View Design Kits & Evaluation Modules
AMC1301  ±250 mV-Input Precision Reinforced Isolated Amplifier for Current Sensing  Isolation  Sample & Buy View Design Kits & Evaluation Modules
AMC1311  2V-Input, Reinforced Isolated Amplifier With High CMTI for Voltage Sensing  Isolation  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  Reinforced isolated amplifier for voltage sensing with ±12-V input  Isolation  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  100-ppm/°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  2.5-V low-drift low-power small-footprint series voltage reference  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
REF3440  4.1-V 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
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AMC1300 Download
AMC1301 Download -
AMC1311 Download Download
CDCLVC1102 Download Download
ISO224 Download
LM27762 Download Download
LM4040-N Download Download
Download Download
Download Download
OPA4171 Download Download
Download Download
OPA4180 Download
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REF3425 Download Download
REF3440 Download Download
SN6501 Download Download
TLV704 Download Download
TLV9061 Download
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TPS60403 Download Download
TPS717 Download Download
Download Download
Download Download
TPS723 Download Download
TVS0500 Download Download

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Technical Documents

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

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