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TIDA-010945

Precision signal chain for digital multimeters reference design

TIDA-010945

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

Industrial

Digital multimeter (DMM) - benchtop

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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.

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Design guide — TIDA-010945

PDF | HTML

TIDUF45.PDF (1957 K)

Reference design overview and verified performance test data

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Schematic — TIDA-010945

TIDMCZ6.PDF (654 K)

Detailed schematic diagram for design layout and components

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Bill of materials (BOM) — TIDA-010945

TIDMCZ7.PDF (149 K)

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

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Assembly drawing — TIDA-010945

TIDMCZ8.PDF (446 K)

Detailed overview of design layout for component placement

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CAD/CAE symbol — TIDA-010945

TIDMD00.ZIP (2195 K)

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

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Gerber file — TIDA-010945

TIDCGP5.ZIP (162 K)

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

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PCB layout — TIDA-010945

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

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

Programmable & variable gain amplifiers (PGAs & VGAs)

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

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

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

Latest version

Version: 1.3.3

Release date: 07 Jun 2024

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Setup_ADS127L21EVM-PDK-GUI.exe — 330090 K

EVM GUI Installer

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Hardware development

Evaluation board

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

Documentation

open-in-new

Manifest

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

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