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TIDA-010970

Low-noise, highly linear digital multimeter and data acquisition signal chain reference design

Design files

TIDA-010970

Design files

Overview

The target application for this design includes digital multimeters (DMMs) that require ultra-high precision to measure dc signals. This design achieves effective dc accuracy using the ADS127L21B, a high-performance, 24-bit analog-to-digital converter (ADC) with effective linearity. An ultra-low drift buried Zener reference, REF81, calibrates the signal chain to eliminate gain and offset errors.

Features
  • Ultra-low drift, low-noise reference for calibrating the entire signal chain, enabling high dc accuracy post-calibration
  • Three input ranges: ±100mV, ±1V, ±10V
  • Linearity: 1.1ppm maximum (±10V range)
  • Noise: 335nVRMS at 60SPS (±10V range)
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Design files & products

Design files

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

download Design guide — TIDA-010970
PDF | HTML
TIDUFC1A.PDF (1995 KB)

Reference design overview and verified performance test data

download Assembly drawing — TIDA-010970
SLURB69.PDF (446 KB)

Detailed overview of design layout for component placement

download Bill of materials (BOM) — TIDA-010970
SLURB70.PDF (137 KB)

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

download CAD/CAE symbol — TIDA-010970
SLURB72.ZIP (3144 KB)

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

download Gerber file — TIDA-010970
SLVC906.ZIP (2238 KB)

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

download PCB layout — TIDA-010970
SLURB71.PDF (3567 KB)

PCB layer plot file used for generating PCB design layout

download Schematic — TIDA-010970
SLVRBX1.PDF (678 KB)

Detailed schematic diagram for design layout and components

Products

Includes TI products in the design and potential alternatives.

Matched thin-film resistors

RES11A — Low-noise matched thin-film resistor divider network with 1kΩ fixed input

Data sheet: PDF | HTML
Series voltage references

REF54 — 0.8ppm/°C drift (max), 0.11ppmp-p 1/f noise, 380μA current precision voltage reference

Data sheet: PDF | HTML
Matched thin-film resistors

RES21A — All-purpose matched thin-film resistor divider network with 10kΩ fixed input

Data sheet: PDF | HTML
Analog & precision switches & muxes

TMUX6104 — 5-pA on-state leakage current, ±16.5-V, 4:1, 1-channel precision analog multiplexer

Data sheet: PDF | HTML
Analog & precision switches & muxes

MUX36S08 — 1-pA on-state leakage current, 36-V, 8:1, 1-channel precision analog multiplexer

Data sheet: PDF | HTML
Precision op amps (Vos<1mV)

THP210 — High precision (40-μV, 0.1μV/C), high-voltage (36-V), low-noise (3.7-nV/√Hz), fully-differential amp

Data sheet: PDF | HTML
Precision op amps (Vos<1mV)

OPA828 — High-speed (45 MHz and 150 V/μs), 36-V, low-noise (4 nV/√Hz) RRO JFET operational amplifier

Data sheet: PDF | HTML
Precision ADCs

ADS127L21B — 24bit, 512kSPS wide-bandwidth delta-sigma ADC with high-linearity of 0.8 ppm max INL

Data sheet: PDF | HTML
Series voltage references

REF81 — Temperature-controlled buried-Zener reference with 0.05ppm/°C drift and <1ppm stability

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

The target application for this design includes digital multimeters (DMMs) that require ultra-high precision to measure dc signals. This design achieves effective dc accuracy using the ADS127L21B, a high-performance, 24-bit analog-to-digital converter (ADC) with effective linearity. An ultra-low (...)

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.

Technical documentation

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* Design guide Low-Noise, Highly Linear Digital Multimeter and Data Acquisition Signal Chain Reference Design (Rev. A) PDF | HTML Feb 18, 2026

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