TIDA-01057

Reference Design Maximizing Signal Dynamic Range for True 10 Vpp Differential Input to 20 bit ADC

TIDA-01057

Design files

Overview

This reference design is designed for high performance data acquisition(DAQ) systems to improve the dynamic range of 20 bit differential input ADCs. Many DAQ systems require the measurement capability at a wide FSR (Full Scale Range) in order to obtain sufficient signal dynamic range. Many earlier reference designs for SAR ADCs have used the THS4551 FDA (fully differential amplifier). However, the THS4551 is limited to a 5.4V maximum supply which is not sufficient for realizing the true 10Vpp differential output (10V FSR) required to maximize the dynamic range of SAR ADCs with a 5V reference. This reference design explores the benefits of a true 10Vpp differential output by implementing TI's new THS4561 FDA which has a maximum supply of 12.6V. You will see that this design was able to achieve superior performance to the previous design (TIDA-01054) while also lowering overall power consumption.

Features
  • True 10VPP differential analog front end to 20-Bit ADC
  • Modular front-end reference design for high channel count systems that can be repeated

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.

TIDUDX5.PDF (949 K)

Reference design overview and verified performance test data

TIDRVO8.PDF (844 K)

Detailed schematic diagram for design layout and components

TIDRVO9.PDF (123 K)

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

TIDRVP0.PDF (983 K)

Detailed overview of design layout for component placement

TIDRVP2.ZIP (30897 K)

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

TIDCEI7.ZIP (2100 K)

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

TIDRVP1.PDF (4279 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Buck converters (integrated switch)

LM460013.5 to 60V, 1A Synchronous Step-Down Voltage Converter

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

LM557475V, 0.5A Step-Down Switching Regulator

Data sheet document-pdfAcrobat PDF
Buck converters (integrated switch)

LMS3635-Q13.5A /5.5A, 36V Synchronous, 400kHz, Step-Down Converter

Data sheet document-pdfAcrobat PDF open-in-new HTML
Buck modules (integrated inductor)

LMZ14201SIMPLE SWITCHER® 6V to 42V, 1A Power Module in Leaded Surface Mount TO Package

Data sheet document-pdfAcrobat PDF open-in-new HTML
Buck modules (integrated inductor)

LMZ14202SIMPLE SWITCHER® 6V to 42V, 2A Power Module in Leaded SMT-TO Package

Data sheet document-pdfAcrobat PDF open-in-new HTML
Buck modules (integrated inductor)

LMZ14203SIMPLE SWITCHER® 6V to 42V, 3A Power Module in Leaded Surface Mount TO Package

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

LM7705Low Noise Negative Bias Generator

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

LMK00804BLow skew, 1-to-4 multiplexed differential/LVCMOS-to-LVCMOS/TTL fanout buffer

Data sheet document-pdfAcrobat PDF open-in-new HTML
D-type flip-flops

SN74AUP1G80Low-Power Single Postitive-Edge-Triggered D-Type Flip-Flop

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

THS4561Low-power, 60-MHz, wide-supply-range fully differential amplifier

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

OPA625High Bandwidth, High Precision, Low Noise & Distortion Amplifier SAR ADC Driver with Power Scaling

Data sheet document-pdfAcrobat PDF open-in-new HTML
Inverting buffers & drivers

SN74AHC1G04Single 2-V to 5.5-V inverter

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

TPS7A3001-EPEnhanced Product Negative Vin, -200mA, Ultra-Low-Noise, High-PSRR, Low-Dropout Linear Regulator

Data sheet document-pdfAcrobat PDF
Linear & low-dropout (LDO) regulators

TPS7A471-A, 36-V, low-noise, high-PSRR, low-dropout voltage regulator with enable

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

LMK61E2156.250-MHz, ±50 ppm, ultra-low jitter, integrated EEPROM, fully programmable oscillator

Data sheet document-pdfAcrobat PDF open-in-new HTML
Precision ADCs (<=10MSPS)

ADS8900B20-Bit, 1-MSPS, 1-Ch SAR ADC with Internal VREF Buffer, Internal LDO and Enhanced SPI Interface

Data sheet document-pdfAcrobat PDF open-in-new HTML
Precision op amps (Vos<1mV)

OPA376Precision (0.025mV), low noise (7.5nV/rtHz), low quiescent current (760uA) op amp

Data sheet document-pdfAcrobat PDF open-in-new HTML
Precision op amps (Vos<1mV)

OPA378Low-noise, 900-kHz, RRIO, precision operational amplifier, zero-drift series

Data sheet document-pdfAcrobat PDF
Precision op amps (Vos<1mV)

OPA827Low-Noise, High-Precision, JFET-Input Operational Amplifier ;

Data sheet document-pdfAcrobat PDF open-in-new HTML
Series voltage references

REF50404.096-V, 3-µVpp/V noise, 3-ppm/°C drift precision series voltage reference

Data sheet document-pdfAcrobat PDF open-in-new HTML
Series voltage references

REF60505-V, 5-ppm/°C high-precision voltage reference with integrated buffer & enable pin

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

Technical documentation

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Type Title Date
* Design guide Ref Design for Maximizing Signal Dynamic Range for True 10Vpp Differential Input Feb. 23, 2018

Related design resources

Reference designs

REFERENCE DESIGN
TIDA-00732 18-bit, 2-Msps Isolated Data Acquisition Reference Design to Achieve Maximum SNR and Sampling Rate TIDA-01035 20-bit Isolated Data Acquisition Reference Design Optimizing Jitter for Max SNR and Sample Rate TIDA-01037 20-bit, 1-MSPS Isolator Optimized Data Acquisition Reference Design Maximizing SNR and Sample Rate TIDA-01050 Optimized Analog Front End DAQ System Reference Design for 18 bit SAR Data Converters TIDA-01051 Reference Design Optimizing FPGA Utilization and Data Throughput for Automatic Test Equipment TIDA-01052 ADC Driver Reference Design Improving Full Scale THD Using Negative Supply TIDA-01053 ADC Driver Reference Design Optimizing THD, Noise, and SNR for High Dynamic Range Instrumentation TIDA-01054 Multi-Rail Power Reference Design for Eliminating EMI Effects in High Performance DAQ Systems TIDA-01055 ADC Voltage Reference Buffer Optimization Reference Design for High Performance DAQ Systems TIDA-01056 20-bit 1MSPS DAQ Reference Design Optimizing Power Supply Efficiency While Minimizing EMI

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