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TIDA-010945

Precision signal chain for digital multimeters reference design

TIDA-010945

Design files

Overview

This reference design explains the theory, design and testing of a high-performance signal chain for DC measurements. The main target application is digital multimeters (DMMs), however the design can also be applicable to other applications, such as data acquisition (DAQ) and condition monitoring. This design achieves high-DC accuracy using a high-performance 24-bit analog-to-digital converter, ADS127L21 and a low-noise programmable gain amplifier, PGA855, with a typical nonlinearity of ±2.4ppm and low drift over temperature. These devices are highly integrated, simplifying the overall signal chain design.

Features
  • Excellent DC performance, enabling high accuracy
  • Highly-integrated components, simplifying signal chain design
  • Wide input range due to the input programmable gain filter
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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.

PDF | HTML
TIDUF45.PDF (1957 K)

Reference design overview and verified performance test data

TIDMCZ6.PDF (654 K)

Detailed schematic diagram for design layout and components

TIDMCZ7.PDF (149 K)

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

TIDMCZ8.PDF (446 K)

Detailed overview of design layout for component placement

TIDMD00.ZIP (2195 K)

Files used for 3D models or 2D drawings of IC components

TIDCGP5.ZIP (162 K)

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

TIDMCZ9.PDF (2108 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Precision ADCs

ADS127L2124-bit, 512-kSPS wide-bandwidth delta-sigma ADC with programmable IIR and FIR filters

Data sheet: PDF | HTML
Programmable & variable gain amplifiers (PGAs & VGAs)

PGA855Low-noise, wide-bandwidth, fully-differential-output programmable-gain instrumentation amplifier

Data sheet: PDF | HTML
Series voltage references

REF70Ultra-high-precision voltage reference with low noise and low drift

Data sheet: PDF | HTML

Start development

Software

GUI for evaluation module (EVM)

ADS127L21EVM-PDK-GUI ADS127L21EVM-PDK GUI installer

Evaluate the ADS127L21 using the evaluation module (EVM) product development kit (PDK)
Supported products & hardware

Supported products & hardware

Hardware development
Evaluation board
ADS127L21EVM-PDK ADS127L21 evaluation module for ADC with easy-to-drive inputs and wideband or low-latency filters
Download options

ADS127L21EVM-PDK-GUI ADS127L21EVM-PDK GUI installer

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Latest version
Version: 1.3.3
Release date: 07 Jun 2024
lock = Requires export approval (1 minute)
Hardware development
Evaluation board
ADS127L21EVM-PDK ADS127L21 evaluation module for ADC with easy-to-drive inputs and wideband or low-latency filters

Documentation

Release Infomation

Evaluation GUI for the ADS127L21EVM-PDK

What's new

  • V1.3.3 - Added support for importing MATLAB filter coefficient files (FCF) with floating-point values.
  • V1.3.2 - Updated register map to match latest datasheet revision (SBASAK4A).
  • V1.3.1 - Fixed a bug in the filter response computation that often producted the incorrect results when the IIR stage was enabled.

Technical documentation

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Type Title Date
Design guide Precision signal chain for digital multimeters reference design PDF | HTML May 31, 2024

Related design resources

Hardware development

EVALUATION BOARD
ADS127L21EVM-PDK ADS127L21 evaluation module for ADC with easy-to-drive inputs and wideband or low-latency filters

Support & training

TI E2E™ forums with technical support from TI engineers

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