TIADS131E08 24-bit low-power analog front end (AFE) solution

Amplifier (PGA), reference power supply and oscillator, with industrial power supply monitoring, control and protection functions. ADS131E0x has eight differential current and voltage inputs , The dynamic range at 1 kSPS is 118dB, the crosstalk is -110dB, the THD of 50Hz and 60Hz is -90dB, mainly used in energy metering, power monitoring, control and protection, etc. This article introduces the main characteristics of ADS131E0x, block diagram, typical application Circuit diagram, and Power monitoring system frame diagram, main features of ADS131E08EVM-PDK evaluation board, circuit diagram, bill of materials and PCB component layout diagram.

The ADS131E0x are a family of multichannel, simultaneous sampling, 24- and 16-bit, delta-sigma (ΔΣ), analog-to-digital converters (ADCs) with a built-in programmable gain amplifier (PGA), internal reference, and an onboard oscillator.

The ADS131E0x incorporate features commonly required in industrial power monitoring, control, and protection applications. The ADS131E0x inputs can be independently and directly interfaced with a resistor-divider network or a transformer to measure voltage. The inputs can also be interfaced to a current transformer or Rogowski coil to measure current. With high integration levels and exceptional performance, the ADS131E0x family enables the creation of scalable industrial power systems at significantly reduced size, power, and low overall cost.

The ADS131E0x have a flexible input multiplexer per channel that can be independently connected to the internally-generated signals for test, temperature, and fault detection. Fault detection can be implemented internal to the device, using the integrated comparators with digital-to-analog converter (DAC)-controlled trigger levels. The ADS131E0x can operate at data rates as high as 64 kSPS.

These complete analog front-end (AFE) solutions are packaged in a TQFP-64 package and are specified over the industrial temperature range of –40℃ to +105℃

Main features of ADS131E0x:

Eight Differential Current and Voltage Inputs

Outstanding Performance:

Exceeds Class 0.1 Performance

Dynamic Range at 1 kSPS: 118 dB

Crosstalk: –110 dB

THD: –90 dB at 50 Hz and 60 Hz

Supply Range:

Analog: +3 V to +5 V (Unipolar)±2.5 V (Bipolar, allows dc coupling)

Digital: +1.8 V to +3.6 V

Low Power: 2 mW per Channel

Data Rates: 1, 2, 4, 8, 16, 32, and 64 kSPS

Programmable Gains (1, 2, 4, 8, and 12)

Fault Detection and Device Testing Capability

SPI™ Data Interface and Four GPIOs

Package: TQFP-64 (PAG)

Operating Temperature Range:

–40℃ to +105℃

ADS131E0x application:

Industrial Power Applications:

Energy Metering

Monitoring, Control, and Protection

ADS131E08EVM-PDK evaluation board

This user’s guide describes the characteristics, operation, and use of the ADS131E08EVM-PDK. This performance demonstration kit is an evaluation module for the ADS131E08, an eight-channel, 24-bit, lowpower, integrated analog front-end (AFE) designed for power protection Circuits. The ADS131E08EVMPDK is intended for prototyping and evaluation. This user’s guide includes a complete circuit description, schematic diagram, and bill of materials.
The ADS131E08EVM-PDK is a demonstration kit for the ADS131E08, a simultaneous sampling, 24-bit, delta-sigma (Δ Σ) analog-to-digital converter (ADC) with a built-in programmable gain amplifier (PGA), internal reference , and an onboard oscillator. The ADS131E08 contains the features commonly required for industrial power monitoring and control but has the flexibility to fit a variety of applications which require an eight channel, 24-bit ADC. The ADS131E08EVM-PDK demonstration kit is designed to expedite evaluation and system development.

Main features of ADS131E08EVM-PDK evaluation board:

Easy-to-use evaluation software for Microsoft™ Windows XP or Windows 7

Built-in analysis tools including oscilloscope, FFT, and histogram Displays

Flexible input configurations

Optional external reference circuits

Ability to export data in simple test files for post processing.