Product details

Number of channels 1 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 2.5 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 5.5 BW at Acl (MHz) 36 Acl, min spec gain (V/V) 1 Slew rate (typ) (V/µs) 220 Architecture Bipolar, Fully Differential ADC Driver Vn at flatband (typ) (nV√Hz) 10 Iq per channel (typ) (mA) 0.25 Rail-to-rail In to V-, Out Vos (offset voltage at 25°C) (max) (mV) 0.4 Operating temperature range (°C) -40 to 125 Iout (typ) (mA) 26 2nd harmonic (dBc) 129 3rd harmonic (dBc) 138 Frequency of harmonic distortion measurement (MHz) 0.001 GBW (typ) (MHz) 27 Input bias current (max) (pA) 250000 Features Shutdown CMRR (typ) (dB) 116 Rating Catalog
Number of channels 1 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 2.5 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 5.5 BW at Acl (MHz) 36 Acl, min spec gain (V/V) 1 Slew rate (typ) (V/µs) 220 Architecture Bipolar, Fully Differential ADC Driver Vn at flatband (typ) (nV√Hz) 10 Iq per channel (typ) (mA) 0.25 Rail-to-rail In to V-, Out Vos (offset voltage at 25°C) (max) (mV) 0.4 Operating temperature range (°C) -40 to 125 Iout (typ) (mA) 26 2nd harmonic (dBc) 129 3rd harmonic (dBc) 138 Frequency of harmonic distortion measurement (MHz) 0.001 GBW (typ) (MHz) 27 Input bias current (max) (pA) 250000 Features Shutdown CMRR (typ) (dB) 116 Rating Catalog
VSSOP (DGK) 8 14.7 mm² (3 mm × 4.9 mm) SOIC (D) 8 29.4 mm² (4.9 mm × 6 mm) WQFN (RUN) 10 4 mm² (2 mm × 2 mm)
  • Ultra Low-Power:
    • Voltage: 2.5 V to 5.5 V
    • Current: 250 µA
    • Power-Down Mode: 0.5 µA (Typical)
  • Fully Differential Architecture
  • Bandwidth: 36 MHz (Av = 1 V/V)
  • Slew Rate: 200 V/µs
  • THD: –120 dBc at 1 kHz (1 VRMS, RL= 2 kΩ)
  • Input Voltage Noise: 10 nV/√Hz (f = 1 kHz)
  • High DC Accuracy:
    • VOS: ±100 µV
    • VOS Drift: ±3 µV/˚C (–40°C to +125°C)
    • AOL: 114 dB
  • Rail-to-Rail Output (RRO)
  • Negative Rail Input (NRI)
  • Output Common-Mode Control
  • 8-Pin SOIC (D) and VSSOP (DGK)
  • 10-Pin WQFN (RUN)
  • Ultra Low-Power:
    • Voltage: 2.5 V to 5.5 V
    • Current: 250 µA
    • Power-Down Mode: 0.5 µA (Typical)
  • Fully Differential Architecture
  • Bandwidth: 36 MHz (Av = 1 V/V)
  • Slew Rate: 200 V/µs
  • THD: –120 dBc at 1 kHz (1 VRMS, RL= 2 kΩ)
  • Input Voltage Noise: 10 nV/√Hz (f = 1 kHz)
  • High DC Accuracy:
    • VOS: ±100 µV
    • VOS Drift: ±3 µV/˚C (–40°C to +125°C)
    • AOL: 114 dB
  • Rail-to-Rail Output (RRO)
  • Negative Rail Input (NRI)
  • Output Common-Mode Control
  • 8-Pin SOIC (D) and VSSOP (DGK)
  • 10-Pin WQFN (RUN)

The THS4531A device is a low-power, fully differential amplifier with input common-mode range below the negative rail and rail-to-rail output. The device is designed for low-power data acquisition systems and high-density applications where power consumption and dissipation is critical.

The device features accurate output common-mode control that allows for DC coupling when driving analog-to-digital converters (ADCs). This control, coupled with the input common-mode range below the negative rail and rail-to-rail output, allows for easy interface from single-ended ground-referenced signal sources to successive-approximation registers (SARs), and delta-sigma (ΔΣ) ADCs using only single-supply 2.5-V to 5-V power. The THS4531A is also a valuable tool for general-purpose, low-power differential signal conditioning applications.

The THS4531A device is a low-power, fully differential amplifier with input common-mode range below the negative rail and rail-to-rail output. The device is designed for low-power data acquisition systems and high-density applications where power consumption and dissipation is critical.

The device features accurate output common-mode control that allows for DC coupling when driving analog-to-digital converters (ADCs). This control, coupled with the input common-mode range below the negative rail and rail-to-rail output, allows for easy interface from single-ended ground-referenced signal sources to successive-approximation registers (SARs), and delta-sigma (ΔΣ) ADCs using only single-supply 2.5-V to 5-V power. The THS4531A is also a valuable tool for general-purpose, low-power differential signal conditioning applications.

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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet THS4531A Ultra Low-Power, Rail-to-Rail Output, Fully Differential Amplifier datasheet (Rev. D) PDF | HTML Mar 4, 2020
Application brief Why Use an FDA to Drive an ADC? PDF | HTML Jan 8, 2026
Application brief Active Filter Design for Differential ADCs (Rev. A) PDF | HTML Oct 8, 2025
Product overview High Speed Amplifiers for Motor Encoders and Position Sensing PDF | HTML Apr 11, 2025
Product overview Pairing ADC Drivers With Fully-Differential Input ADCs for Wide Bandwidth Data Acquisition Apr 1, 2024
Application brief Maximizing System Total Harmonic Distortion Using High Speed Amplifiers Jun 20, 2018
E-book The Signal e-book: A compendium of blog posts on op amp design topics PDF | HTML Mar 28, 2017
Application note Fully-Differential Amplifiers (Rev. E) Sep 19, 2016
Analog design Journal Using fully differential op amps as attenuators, Part 3 Oct 4, 2009
Analog design Journal Using fully differential op amps as attenuators, Part 2 Jul 14, 2009
Analog design Journal Using fully differential op amps as attenuators, Part 1 May 1, 2009
Analog design Journal Analysis of fully differential amplifiers Mar 11, 2005
Analog design Journal Designing for low distortion with high-speed op amps Mar 2, 2005
Application note Noise Analysis for High Speed Op Amps (Rev. A) Jan 17, 2005

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

THS4531ADGKEVM — THS4531ADGKEVM Evaluation Module

The THS4531ADGKEVM is designed to quickly and easily demonstrate the functionality and versatility of the amplifier. The EVM is ready to connect to power, signal source, and test instruments through the use of on-board connectors. The default amplifier configuration is single-ended input, (...)

User guide: PDF
Supported products & hardware
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Simulation model

THS4531 TINA-TI Reference Design

SLOM262.TSC (3751 KB) - TINA-TI reference design
Supported products & hardware
Simulation model

THS4531A PSpice Model (Rev. A)

SLOM350A.ZIP (276 KB) - PSpice model
Supported products & hardware
Simulation model

THS4531A TINA-TI Reference Design (Rev. A)

SLOM352A.TSC (68 KB) - TINA-TI reference design
Supported products & hardware
Simulation model

THS4531A TINA-TI Spice Model (Rev. A)

SLOM351A.ZIP (15 KB) - TINA-TI Spice model
Supported products & hardware
Calculation tool

SBOR022 — TI FDA Calculator

Supported products & hardware
Reference design

TIDA-00176 — Interface to Sin/Cos Encoders with High-Resolution Position Interpolation Reference Design

The TIDA-00176 reference design is an EMC compliant industrial interface to Sin/Cos position encoders. Applications include industrial drives, which require accurate speed and position control.
The design utilizes a 16-bit dual sample ADC with drop-in compatible 14- or 12-bit versions available, (...)

Supported products & hardware
Reference design

TIDA-00178 — Interface to a Sin/Cos Encoder with Sitara AM437x Reference Design

The TIDA-00178 reference design is an EMC compliant industrial interface to Sin/Cos position encoders. Applications include industrial drives, which require accurate speed and position control.

The design utilizes a 16-bit dual sample ADC with drop-in compatible 14- or 12-bit versions available, (...)

Supported products & hardware
Reference design

TIDA-00187 — Extending Rail-to-Rail Output Range for Fully Differential Amplifiers to Include True Zero Volts

Operational amplifiers (op amps) have been used for decades in signal conditioning circuits and measurement systems. An op amp that has an output spanning from negative to positive supply rail are generally referred to as rail-to-rail output (RRO) op amps. These devices have been used increasingly (...)

Supported products & hardware
Reference design

TIDA-00202 — Interface to a HIPERFACE Position Encoder Reference Design

The TIDA-00202 reference design implements an EMC compliant industrial hybrid analog and digital interface to a HIPERFACE position encoder. A 3.3V supply RS485 transceiver with IEC-ESD and IEC-EFT protection is used for the bidirectional parameter channel. For the analog sin/cos signal (...)

Supported products & hardware
Reference design

TIDA-00368 — Reference Design for Interfacing Current Output Hall Sensors and CTs with Differential ADC/MCU

This reference design provides interfacing current output Hall sensors and current transformers to differential ADC (standalone and integrated into MCU). The differential signal conditioning circuit is designed to measure motor current with an accuracy of ±0.5% across operating (...)

Supported products & hardware
Package Pins CAD symbols, footprints & 3D models
VSSOP (DGK) 8 Ultra Librarian
SOIC (D) 8 Ultra Librarian
WQFN (RUN) 10 Ultra Librarian

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