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TIDA-010945

Integrated, low-drift precision digital multimeters & data acquisition signal chain reference design

Design files

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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Design files & products

Design files

Download ready-to-use system files to speed your design process.

download Design guide — TIDA-010945
PDF | HTML
TIDUF45A.PDF (1976 KB)

Reference design overview and verified performance test data

download Assembly drawing — TIDA-010945
TIDMCZ8.PDF (446 KB)

Detailed overview of design layout for component placement

download Bill of materials (BOM) — TIDA-010945
TIDMCZ7.PDF (149 KB)

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

download CAD/CAE symbol — TIDA-010945
TIDMD00.ZIP (2195 KB)

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

download Gerber file — TIDA-010945
TIDCGP5.ZIP (163 KB)

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

download PCB layout — TIDA-010945
TIDMCZ9.PDF (2109 KB)

PCB layer plot file used for generating PCB design layout

download Schematic — TIDA-010945
TIDMCZ6.PDF (655 KB)

Detailed schematic diagram for design layout and components

Products

Includes TI products in the design and potential alternatives.

Programmable & variable gain amplifiers (PGAs & VGAs)

PGA855 — Low-noise, wide-bandwidth, fully-differential-output programmable-gain instrumentation amplifier

Data sheet: PDF | HTML
Precision ADCs

ADS127L21 — 24-bit, 512-kSPS wide-bandwidth delta-sigma ADC with programmable IIR and FIR filters

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

PGA849 — Low-noise wide-bandwidth precision programmable-gain amplifier

Data sheet: PDF | HTML
Series voltage references

REF70 — Ultra-high-precision voltage reference with low noise and low drift

Data sheet: PDF | HTML

Start development

Hardware development

Evaluation board

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

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. (...)

EVM user’s guide: PDF | HTML
Supported products & hardware

Supported products & hardware

Hardware development
Reference design
TIDA-010945 — Integrated, low-drift precision digital multimeters & data acquisition signal chain reference design TIDA-010970 — Low-noise, highly linear digital multimeter and data acquisition signal chain reference design
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ADS127L21EVM-PDK — ADS127L21 evaluation module for ADC with easy-to-drive inputs and wideband or low-latency filters

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Hardware development
Reference design
TIDA-010945 — Integrated, low-drift precision digital multimeters & data acquisition signal chain reference design TIDA-010970 — Low-noise, highly linear digital multimeter and data acquisition signal chain reference design
TI’s Standard Terms and Conditions for Evaluation Items apply.

Software development

GUI for evaluation module (EVM)

ADS127L21EVM-PDK-GUI — ADS127L21EVM-PDK GUI installer

Supported products & hardware

Supported products & hardware

Hardware development
Reference design
TIDA-010945 — Integrated, low-drift precision digital multimeters & data acquisition signal chain reference design
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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Version: 1.3.3
Release date: Jun 7, 2024
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Setup_ADS127L21EVM-PDK-GUI.exe  — 330090 K

EVM GUI Installer

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Hardware development
Reference design
TIDA-010945 — Integrated, low-drift precision digital multimeters & data acquisition signal chain reference design
Evaluation board
ADS127L21EVM-PDK — ADS127L21 evaluation module for ADC with easy-to-drive inputs and wideband or low-latency filters

Documentation

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Manifest

Manifest

Release Information

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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* Design guide Integrated, Low-Drift Digital Multimeter and Data Acquisition Signal Chain Reference Design (Rev. A) PDF | HTML Feb 12, 2026

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