Isolated, Transformerless, Bipolar Supply for 24-Bit ADCs Reference Design


Design files


This isolated, 3.65-mm thin reference design enables highly-integrated, bipolar input and high-performance solutions with a 24-bit delta-sigma analog-to-digital converter (ADC). Modern analog input modules need high performance in different aspects such as higher channel density at the same room size, which requires lower power consumption, and a wider operating temperature range at the same time.

  • Performance evaluation of integrated isolated power supply, technology and inverting charge pump in conjunction with high precision delta-sigma ADC ADS124S08
  • Isolated power design with a 3.3-V backplane power supply source
  • Transformerless, 3.65-mm total height, highly integrated design
  • Comparison of effective resolution of ADS124S08 data sheet values, reference setup and design under test
Output voltage options TIDA-01434.1 TIDA-01434.2 TIDA-01434.3
Vin (Min) (V) 3 3 3
Vin (Max) (V) 3.6 3.6 3.6
Vout (Nom) (V) 3.3 -2.5 2.5
Iout (Max) (A) .05 .01 .01
Output Power (W) .165 .025 .025
Isolated/Non-Isolated Isolated Isolated Isolated
Input Type DC DC DC
Topology Other Linear Regulator^Other Linear Regulator
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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.


Reference design overview and verified performance test data

TIDRV05A.PDF (731 K)

Detailed schematic diagram for design layout and components

TIDRV06.PDF (58 K)

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

TIDRV07.PDF (1466 K)

Detailed overview of design layout for component placement

TIDRV09A.ZIP (2178 K)

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


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

TIDRV08.PDF (4186 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

AC/DC & DC/DC converters (integrated FET)

LM27762Low-Noise Positive- and Negative-Output Charge Pump With Integrated LDO

Data sheet: PDF | HTML
Digital isolators

ISO7741Robust EMC, quad-channel, 3/1, reinforced digital isolator

Data sheet: PDF | HTML
Inverting buffers & drivers

SN74AHC1G04Single 2-V to 5.5-V inverter

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS7A87500-mA, low-noise, high-PSRR, dual-channel adjustable ultra-low-dropout voltage regulator

Data sheet: PDF | HTML
Noninverting buffers & drivers

SN74AHC1G125Single 2-V to 5.5-V buffer with 3-state outputs

Data sheet: PDF | HTML
Precision ADCs

ADS124S0824-bit, 4-kSPS, 12-ch delta-sigma ADC with PGA and voltage reference for sensor measurement

Data sheet: PDF | HTML
Series voltage references

REF62252.5-V, 3-ppm/°C high-precision voltage reference with integrated buffer & enable pin

Data sheet: PDF | HTML
Signal isolators with integrated power

ISOW7841Quad-channel, 3/1, reinforced digital isolator with integrated power

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide Isolated, Transformerless, Bipolar Supply for 24-Bit ADCs Reference Design (Rev. A) Aug. 23, 2018
Product overview Isolated Power Topologies for PLC I/O Modules and Other Low-Power Applications PDF | HTML Nov. 09, 2022

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