TIDA-00942

12-bit, 20-MSPS Data Acquisition Reference Design for Digitizer

TIDA-00942

Design files

Overview

This reference design enables a cost-effective and low-power data acquisition system that provides an alternative to FPGA-based systems. It features a single-ended, high-impedance input that can be used in a wide number of applications, including portable instrumentation and digitizers.

The reference design utilizes the ADS4122 analog-to-digital converter (ADC), along the with the OPA656 and THS4541 operational amplifiers (op amps) to develop a 12-bit, 20-MSPS digitizer for the BeagleBone Cape form factor. The expansion board devleoped in this reference design interfaces with the BeagleBone Black development platform, which is a low-cost, open-source, community-supported environment based on the ARM Cortex-A8 processor.

Features
  • Single-ended-to-differential data acquisition reference design using the OPA656 and THS4541 op amps
  • Low-power (330/channel) operation suitable for handheld devices
  • Option to choose between 50 ohm / 1 Mohm input impedance
  • Low system cost; replaces FPGA for data capture with Sitara™ processor (BeagleBone Black)
  • 2V peak-to-peak input voltage range

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.

TIDUC79.PDF (1443 K)

Reference design overview and verified performance test data

TIDROF3.PDF (90 K)

Detailed schematic diagram for design layout and components

TIDROF4.PDF (253 K)

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

TIDROF5.PDF (52 K)

Detailed overview of design layout for component placement

TIDROF7.ZIP (1511 K)

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

TIDCCU4.ZIP (175 K)

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

TIDROF6.PDF (722 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Arm-based processors

AM3358Sitara processor: Arm Cortex-A8, 3D graphics, PRU-ICSS, CAN

Data sheet document-pdfAcrobat PDF open-in-new HTML
Buck converters (integrated switch)

TPS625902.25MHz, 1A Step-Down Converter in 2 x 2 SON Package

Data sheet document-pdfAcrobat PDF open-in-new HTML
Charge pumps (inductorless)

TPS6040360mA Charge Pump Voltage Inverter with Fixed 250kHz Operation

Data sheet document-pdfAcrobat PDF open-in-new HTML
Fully differential amplifiers

THS4541High-Speed Differential I/O Amplifier

Data sheet document-pdfAcrobat PDF open-in-new HTML
High-speed ADCs (>10MSPS)

ADS412212-Bit, 65-MSPS Analog-to-Digital Converter (ADC)

Data sheet document-pdfAcrobat PDF open-in-new HTML
High-speed op amps (GBW ≥ 50 MHz)

OPA656Wideband, Unity Gain Stable FET-Input Operational Amplifier

Data sheet document-pdfAcrobat PDF open-in-new HTML
Linear & low-dropout (LDO) regulators

TPS7A30200-mA, low-noise, high-PSRR, negative, adjustable low-dropout voltage regulator with enable

Data sheet document-pdfAcrobat PDF open-in-new HTML
Linear & low-dropout (LDO) regulators

TPS7A49150-mA, 36-V, low-noise, high-PSRR, adjustable low-dropout voltage regulator with enable

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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* Design guide 12-Bit, 20-MSPS Data Acquisition Reference Design for Digitizers Oct. 02, 2016

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