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TIPD115

Data acquisition optimized for low distortion, low noise 18-bit 1-MSPS reference design

Design files

TIPD115

Design files

Overview

This verified design is a high performance data acquisition system (DAQ) using an 18-bit SAR ADC, ADS8881 at a throughput of 1MSPS. This design has been optimized to provide the lowest noise & distortion solution for a full scale input sinewave of 10 KHz. This leads to a maximum possible value for Effective Number of Bits (ENOB) at a total power consumption of less than 50mW. The input driver for the ADC uses the fully-differential THS4521 for extremely low distortion, noise and high small signal bandwidth. The reference buffer drive utilizes a composite buffer made out of THS4281 & OPA333 to get the desired performance at lowest power consumption.

Features
  • 18 Bit, 1Msps Sampling Rate
  • DC, 10kHz AC
  • Optimization: ENOB
  • Power: 50mW @ AVDD = 5V
  • Utilizes ADS8881 (18bit, 1Msps SAR ADC), THS4521 (Input), OPA333 + THS4281 + REF5045 (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 — TIPD115
TIDR211.PDF (31 K)

Detailed schematic diagram for design layout and components

download Schematic — TIPD115
SLAC585.ZIP (959 K)

Detailed schematic diagram for design layout and components

download Bill of materials (BOM) — TIPD115
TIDR212.PDF (71 K)

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

download Gerber file — TIPD115
TIDC159.ZIP (354 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
Precision ADCs

ADS9110 — 18-bit, 2-MSPS, one-channel SAR ADC with enhanced serial peripheral interface (SPI)

Data sheet: PDF | HTML
Fully differential amplifiers

THS4521 — Very low power rail-to-rail output fully differential amplifier

Data sheet: PDF | HTML
High-speed op amps (GBW ≥ 50 MHz)

THS4281 — Very Low-Power High Speed Rail-To-Rail Input/Output Voltage Feedback Operational Amplifier

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

OPA333 — Micropower, 1.8-V, 17-µA zero-drift CMOS precision operational amplifier

Data sheet: PDF | HTML
Series voltage references

REF5045 — 4.5-V, 3-µVpp/V noise, 3-ppm/°C drift precision series voltage reference

Data sheet: PDF | HTML

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Software

Technical documentation

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Type Title Date
* User guide 18-Bit 1-MSPS DAQ Optimized for Lowest Distortion and Noise Design Guide (Rev. A) Oct. 13, 2015
Technical article Go differential to differentiate your precision design Aug. 11, 2016
Technical article Leverage coherent sampling and FFT windows when evaluating SAR ADCs (Part 1) Mar. 13, 2015
Technical article Stress-induced outbursts: Microphonics in ceramic capacitors (Part 1) Dec. 19, 2014
Technical article First rule of thumb when driving ADC inputs Sep. 19, 2013

Related design resources

Design tools & simulation

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

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