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

(ACTIVE) TIDA-01057

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Key Document

Description

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

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TI Devices (21)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS8900B  20-Bit, 1-MSPS, SAR ADC with Internal Reference Buffer, LDO & multiSPI™ Digital Interface  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
LM46001  3.5 to 60V, 1A Synchronous Step-Down Voltage Converter  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
LM5574  75V, 0.5A Step-Down Switching Regulator  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
LM7705  Low Noise Negative Bias Generator  DC/DC switching regulators  Sample & Buy View Design Kits & Evaluation Modules
LMK00804B  Low Skew, 1-to-4 Multiplexed Differential/LVCMOS-to-LVCMOS/TTL Fanout Buffer  Clock buffers  Sample & Buy View Design Kits & Evaluation Modules
LMK61E2  Ultra-Low Jitter Fully Programmable Oscillator, Integrated EEPROM, +/-50ppm  Clock & timing  Sample & Buy View Design Kits & Evaluation Modules
LMS3635-Q1  3.5A /5.5A, 36V Synchronous, 400kHz, Step-Down Converter  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
LMZ14201  SIMPLE SWITCHER® 6V to 42V, 1A Power Module in Leaded Surface Mount TO Package  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
LMZ14202  SIMPLE SWITCHER® 6V to 42V, 2A Power Module in Leaded SMT-TO Package  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
LMZ14203  SIMPLE SWITCHER® 6V to 42V, 3A Power Module in Leaded Surface Mount TO Package  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
OPA376  Precision, Low Noise, Low Iq Operational Amplifier  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
OPA378  Low-Noise, 900kHz, RRIO, Precision Operational Amplifier, Zerø-Drift Series  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
OPA625  High Bandwidth, High Precision, Low Noise & Distortion Amplifier SAR ADC Driver with Power Scaling  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
OPA827  Low-Noise, High-Precision, JFET-Input Operational Amplifier  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
REF5040  Low Noise, Very Low Drift, Precision Series Voltage Reference  Voltage references  Sample & Buy Not Available
REF6050  5ppm/C High-Precision Voltage Reference with Integrated High-Bandwidth Buffer  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
SN74AHC1G04  Single Inverter Gate  Buffer/driver  Sample & Buy View Design Kits & Evaluation Modules
SN74AUP1G80  Low-Power Single Postitive-Edge-Triggered D-Type Flip-Flop  Flip-flop/latch/register  Sample & Buy View Design Kits & Evaluation Modules
THS4561  Low Power, 70MHz, High Supply Range, Fully Differential Amplifier  Operational amplifiers (op amps)  Not Available View Design Kits & Evaluation Modules
TPS7A3001-EP  Enhanced Product Negative Vin, -200mA, Ultra-Low-Noise, High-PSRR, Low-Dropout Linear Regulator  Power management  Sample & Buy Not Available
TPS7A47  36-V, 1-A, 4.17-μVRMS, RF low-dropout (LDO) voltage regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ADS8900B Download
LM46001 Download Download
LM5574 Download Download
LM7705 Download Download
LMK00804B Download
LMK61E2 Download Download
LMS3635-Q1 Download Download
LMZ14201 Download Download
LMZ14202 Download Download
LMZ14203 Download Download
OPA376 Download Download
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OPA378 Download Download
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OPA625 Download Download
OPA827 Download Download
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REF5040 Download Download
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REF6050 Download Download
SN74AHC1G04 Download Download
Download Download
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SN74AUP1G80 Download Download
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THS4561 Download -
TPS7A3001-EP Download Download
TPS7A47 Download Download

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Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 949 23 Feb 2018 0
Design files (6)
Title Abstract Type Size (KB) Date Views TI Recommends
ZIP 2100 24 Feb 2018 0
ZIP 30897 24 Feb 2018 0
PDF 4279 24 Feb 2018 0
PDF 983 24 Feb 2018 0
PDF 123 24 Feb 2018 0
PDF 844 24 Feb 2018 0
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