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TIPD154

Low-Power Reference and Bipolar Voltage Conditioning Circuit Reference Design for Low-Power ADCs

Design files

TIPD154

Design files

Overview

This TI Precision Verified Design provides the theory, component selection, and simulation for a single-supply, low-power signal conditioning circuit designed to translate a +/-5 V input signal to the proper input range of a single-supply low-power 16-Bit ΔΣ ADC such as the one inside the MSP430 or other similar single-supply ADCs.  A zero-drift op amp was selected to provide excellent dc performance in the attenuation and level-shifting circuit.  Two low-power reference circuits are used to provide power, the ADC reference voltage, and biasing to the input conditioning circuit.

Features

• TI Precision Designs: Verified Design Contains Theory, Component Selection, TINA-TI Simulation
• Conditions a +/-5V signal input signal for a 1.25V ADC
• Total operational current < 100 μA
• Single-Supply Solution
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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.

download Schematic — TIPD154
TIDR877.PDF (86 K)

Detailed schematic diagram for design layout and components

download Schematic — TIPD154
TIDC309.ZIP (467 K)

Detailed schematic diagram for design layout and components

download Bill of materials (BOM) — TIPD154
TIDR878.PDF (90 K)

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

download Gerber file — TIPD154
TIDC509.ZIP (322 K)

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

Products

Includes TI products in the design and potential alternatives.

Precision op amps (Vos<1mV)

OPA317 — Low Offset, Rail-to-Rail I/O Operational Amplifier

Data sheet: PDF | HTML
Series voltage references

REF3312 — 1.25-V, 30-ppm/°C drift, 3.9-µA, 3-pin SOT-23, 3-pin SC70, 8-pin UQFN voltage reference

Data sheet: PDF | HTML
Series voltage references

REF3330 — 30-ppm/°C drift, 3.9µA, 3-pin SOT-23, 3-pin SC70, 8-pin UQFN series voltage reference

Data sheet: PDF | HTML

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Software

Technical documentation

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Type Title Date
* User guide Low-Power Reference and Bipolar Voltage Conditioning Circuit for Low-Power ADCs Mar. 06, 2014

Related design resources

Design tools & simulation

SIMULATION TOOL
TINA-TI — SPICE-based analog simulation program

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