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TIPD114

Data acquisition at 1-KHz AC, 1-mW 18-bit 1-MSPS reference design

Design files

TIPD114

Design files

Overview

This verified design provides results of a low power, low throughput use case of ADS8881. One of the ways to reduce power for a low throughput application is to select a high throughput (1 MSPS) part and run it at low speed. The power consumed by ADS8881 is 55uW for 10kSPS. The reference drive and the input drive needs to be optimized for low power too. This design covers the various tradeoff's that need to be made and the choices to pick from, in order to bring the overall system power down to 1 mW.

Features
  • 18 Bit, 10ksps Sampling Rate
  • 1kHz AC
  • Optimization: Ultra Low Power
  • Power: 1mW @ AVDD =3.3V
  • Utilizes ADS8881 (18bit, 1Msps SAR ADC), OPA2333 (Input), OPA313 + REF3325 (Reference)
This verified design includes:
  • Theory
  • Component Selection
  • TINA-TI Simulation
  • Schematics and PCB Layout
  • Verification and Measured Performance
  • Modification Options
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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 — TIPD114
TIDR209.PDF (109 K)

Detailed schematic diagram for design layout and components

download Schematic — TIPD114
SLAC584.ZIP (2181 K)

Detailed schematic diagram for design layout and components

download Bill of materials (BOM) — TIPD114
TIDR210.PDF (59 K)

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

download Gerber file — TIPD114
TIDC157.ZIP (1962 K)

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

Products

Includes TI products in the design and potential alternatives.

Precision ADCs

ADS8881 — 18-Bit, 1-MSPS, 1-Ch SAR ADC with True-Differential Input, SPI Interface and Daisy-Chain

Data sheet: PDF | HTML
General-purpose op amps

OPA313 — Single, 5.5-V, 1-MHz, low quiescent current (50-μA), RRIO operational amplifier

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

OPA2333 — 1.8-V, 17-µA, two-channel, micropower zero-drift CMOS operational amplifier

Data sheet: PDF | HTML
Series voltage references

REF3325 — 2.5-V, 30-ppm/°C drift, 3.9-µA, 3-pin SOT-23, 3-pin SC70, 8-pin UQFN voltage reference

Data sheet: PDF | HTML

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Software

Technical documentation

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Type Title Date
* User guide TIPD114 Verified Design Reference Guide Jun. 18, 2013
Technical article Accurate data acquisition? It’s all relative. Aug. 02, 2013

Related design resources

Design tools & simulation

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

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