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High-speed op amps (GBW ≥ 50 MHz)

THS4281

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

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Data sheet

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NEW OPA863A PREVIEW Single-channel, high-precision, low-power, 105-MHz, 12-V RRIO voltage-feedback amplifier Lower Iq (0.75 mA), lower noise (5.9 nV/√Hz) and higher precision (95 uV/C)

THS4281

ACTIVE
Data sheet Order now

Product details

Architecture Voltage FB Number of channels 1 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 2.7 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 16.5 GBW (typ) (MHz) 50 BW at Acl (MHz) 95 Acl, min spec gain (V/V) 1 Slew rate (typ) (V/µs) 35 Vn at flatband (typ) (nV√Hz) 12.5 Vn at 1 kHz (typ) (nV√Hz) 12.5 Iq per channel (typ) (mA) 0.8 Vos (offset voltage at 25°C) (max) (mV) 2.5 Rail-to-rail In, Out Rating Catalog Operating temperature range (°C) -40 to 85 CMRR (typ) (dB) 107 Input bias current (max) (pA) 800000 Offset drift (typ) (µV/°C) 7 Iout (typ) (mA) 30 2nd harmonic (dBc) 69 3rd harmonic (dBc) 76 Frequency of harmonic distortion measurement (MHz) 1
Architecture Voltage FB Number of channels 1 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 2.7 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 16.5 GBW (typ) (MHz) 50 BW at Acl (MHz) 95 Acl, min spec gain (V/V) 1 Slew rate (typ) (V/µs) 35 Vn at flatband (typ) (nV√Hz) 12.5 Vn at 1 kHz (typ) (nV√Hz) 12.5 Iq per channel (typ) (mA) 0.8 Vos (offset voltage at 25°C) (max) (mV) 2.5 Rail-to-rail In, Out Rating Catalog Operating temperature range (°C) -40 to 85 CMRR (typ) (dB) 107 Input bias current (max) (pA) 800000 Offset drift (typ) (µV/°C) 7 Iout (typ) (mA) 30 2nd harmonic (dBc) 69 3rd harmonic (dBc) 76 Frequency of harmonic distortion measurement (MHz) 1
SOIC (D) 8 29.4 mm² 4.9 x 6 SOT-23 (DBV) 5 8.12 mm² 2.9 x 2.8 VSSOP (DGK) 8 14.7 mm² 3 x 4.9
  • Very Low Quiescent Current: 750 µA (at 5 V)
  • Rail-to-Rail Input and Output:
    • Common-Mode Input Voltage Extends
      400 mV Beyond the Rails
    • Output Swings Within 150 mV From the Rails
  • Wide –3-dB Bandwidth at 5 V:
    • 90 MHz at Gain = +1, 40 MHz at Gain = +2
  • High Slew Rate: 35 V/µs
  • Fast Settling Time (2-V Step):
    • 78 ns to 0.1%
    • 150 ns to 0.01%
  • Low Distortion at Gain = +2, VO = 2-VPP, 5 V:
    • –91 dBc at 100 kHz, –67 dBc at 1 MHz
  • Input Offset Voltage: 2.5 mV (Max at +25°C)
  • Output Current > 30 mA (10-Ω Load, 5 V)
  • Low Voltage Noise of 12.5 nV/√Hz
  • Supply Voltages: +2.7 V, 3 V, +5 V, ±5 V, +15 V
  • Packages: SOT23, MSOP, and SOIC
  • APPLICATIONS
    • Portable/Battery-Powered Applications
    • High Channel Count Systems
    • ADC Buffer
    • Active Filters
    • Current Sensing

All other trademarks are the property of their respective owners.

  • Very Low Quiescent Current: 750 µA (at 5 V)
  • Rail-to-Rail Input and Output:
    • Common-Mode Input Voltage Extends
      400 mV Beyond the Rails
    • Output Swings Within 150 mV From the Rails
  • Wide –3-dB Bandwidth at 5 V:
    • 90 MHz at Gain = +1, 40 MHz at Gain = +2
  • High Slew Rate: 35 V/µs
  • Fast Settling Time (2-V Step):
    • 78 ns to 0.1%
    • 150 ns to 0.01%
  • Low Distortion at Gain = +2, VO = 2-VPP, 5 V:
    • –91 dBc at 100 kHz, –67 dBc at 1 MHz
  • Input Offset Voltage: 2.5 mV (Max at +25°C)
  • Output Current > 30 mA (10-Ω Load, 5 V)
  • Low Voltage Noise of 12.5 nV/√Hz
  • Supply Voltages: +2.7 V, 3 V, +5 V, ±5 V, +15 V
  • Packages: SOT23, MSOP, and SOIC
  • APPLICATIONS
    • Portable/Battery-Powered Applications
    • High Channel Count Systems
    • ADC Buffer
    • Active Filters
    • Current Sensing

All other trademarks are the property of their respective owners.

Fabricated using the BiCom-II process, the THS4281 is a low-power, rail-to-rail input and output, voltage-feedback operational amplifier designed to operate over a wide power-supply range of 2.7-V to 15-V single supply, and ±1.35-V to ±7.5-V dual supply. Consuming only 750 µA with a unity gain bandwidth of 90 MHz and a high 35-V/µs slew rate, the THS4281 allows portable or other power-sensitive applications to realize high performance with minimal power. To ensure long battery life in portable applications, the quiescent current is trimmed to be less than 900 µA at +25°C, and 1 mA from –40°C to +85°C.

The THS4281 is a true single-supply amplifier with a specified common-mode input range of 400 mV beyond the rails. This allows for high-side current sensing applications without phase reversal concerns. Its output swings to within 40 mV from the rails with 10-kΩ loads, and 150 mV from the rails with 1-kΩ loads.

The THS4281 has a good 0.1% settling time of 78 ns, and 0.01% settling time of 150 ns. The low THD of –87 dBc at 100 kHz, coupled with a maximum offset voltage of less than 2.5 mV, makes the THS4281 a good match for high-resolution ADCs sampling less than 2 MSPS.

The THS4281 is offered in a space-saving SOT23-5 package, a small MSOP-8 package, and the industry standard SOIC-8 package.

Fabricated using the BiCom-II process, the THS4281 is a low-power, rail-to-rail input and output, voltage-feedback operational amplifier designed to operate over a wide power-supply range of 2.7-V to 15-V single supply, and ±1.35-V to ±7.5-V dual supply. Consuming only 750 µA with a unity gain bandwidth of 90 MHz and a high 35-V/µs slew rate, the THS4281 allows portable or other power-sensitive applications to realize high performance with minimal power. To ensure long battery life in portable applications, the quiescent current is trimmed to be less than 900 µA at +25°C, and 1 mA from –40°C to +85°C.

The THS4281 is a true single-supply amplifier with a specified common-mode input range of 400 mV beyond the rails. This allows for high-side current sensing applications without phase reversal concerns. Its output swings to within 40 mV from the rails with 10-kΩ loads, and 150 mV from the rails with 1-kΩ loads.

The THS4281 has a good 0.1% settling time of 78 ns, and 0.01% settling time of 150 ns. The low THD of –87 dBc at 100 kHz, coupled with a maximum offset voltage of less than 2.5 mV, makes the THS4281 a good match for high-resolution ADCs sampling less than 2 MSPS.

The THS4281 is offered in a space-saving SOT23-5 package, a small MSOP-8 package, and the industry standard SOIC-8 package.
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Technical documentation

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Type Title Date
* Data sheet THS4281 Very Low-Power, High-Speed, Rail-to-Rail Input and Output Voltage-Feedback Operational Amplifier datasheet (Rev. B) PDF | HTML 30 Oct 2015
E-book The Signal e-book: A compendium of blog posts on op amp design topics 28 Mar 2017
White paper Voltage-reference impact on total harmonic distortion 01 Aug 2016
Technical article When to use an amplifier with rail-to-rail inputs – and what to watch out for 30 Jun 2016
Technical article Using SAR ADC TINA Models: Much ado about settling 12 Dec 2014
Application note Low Power Input and Reference Driver Circuit for ADS8318 and ADS8319 24 Jun 2009
Analog Design Journal Designing for low distortion with high-speed op amps 02 Mar 2005
Application note Noise Analysis for High Speed Op Amps (Rev. A) 17 Jan 2005
Application note Voltage Feedback vs. Current Feedback Op Amps 30 Nov 1998

Design & development

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

Evaluation board

THS4281EVM — THS4281 Evaluation Module

The THS4281 evaluation module (EVM) User's Guide is included within the Datasheet.

The THS4281EVM provides a platform for evaluating the THS4281 dual, very low-power, high-speed, rail-to-rail input and output, voltage-feedback amplifier. The user needs only power, input signal, and test instruments (...)

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Simulation model

THS4281 PSpice Model (Rev. B)

SLOC047B.ZIP (54 KB) - PSpice Model
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Simulation model

THS4281 TINA-TI Reference Design

SLOM442.TSC (67 KB) - TINA-TI Reference Design
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Simulation model

THS4281 TINA-TI Spice Model

SLOM443.ZIP (14 KB) - TINA-TI Spice Model
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Calculation tool

ANALOG-ENGINEER-CALC — Analog engineer's calculator

The analog engineer’s calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting operational-amplifier (...)
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Calculation tool

VOLT-DIVIDER-CALC — Voltage divider calculation tool

The voltage divider calculation tool (VOLT-DIVIDER-CALC) quickly determines a set of resistors for a voltage divider. This KnowledgeBase JavaScript utility can be used to find a set of resistors for a voltage divider to achieve the desired output voltage. VOLT-DIVIDER-CALC can also be used to (...)
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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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Simulation tool

TINA-TI — SPICE-based analog simulation program

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
User guide: PDF
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Reference designs

TIPD173 — 16 bit 1MSPS Data Acquisition Reference Design for Single-Ended Multiplexed Applications

This TI Precision Verified Design details a systematic design methodology for a 16 bit, 1MSPS, single-ended data acquisition (DAQ) block optimized to achieve excellent settling time, power consumption, static performance and dynamic performance for multiplexed applications.  The design (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIPD113 — Data acquisition, 10-kHz AC, 35-mW 18-bit 1-MSPS reference design

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 power solution for a full scale input sine wave of 10 KHz. At a total power consumption of less than 35mW, this (...)
User guide: PDF
Schematic: PDF
Reference designs

TIPD112 — Data Acquisition for MUX and Step Inputs, 18 bits, 1uS Full Scale Response Reference Design

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 18-bit settling performance for a Full Scale Step Input signal, thus leading to excellent system linearity. Such an input (...)
User guide: PDF
Schematic: PDF
Reference designs

TIPD115 — Data acquisition optimized for low distortion, low noise 18-bit 1-MSPS reference design

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 (...)
User guide: PDF
Schematic: PDF
Reference designs

TIPD169 — 16-Bit, 1MSPS Multiplexed Data Acquisition Reference Design

This design is for a 16-bit 1MSPS single-ended, multiplexed data acquisition system (DAQ) for dc inputs. The system is composed of a 16-bit successive-approximation-register (SAR) analog-to-digital converter (ADC), SAR ADC driver, reference driver, and multiplexer. The design shows the process to (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIPD149 — Power-optimized 16-bit 1MSPS Data Acquisition Block for Lowest Distortion and Noise Reference Design

This TI Verified Design is the realization of a high precision, 16-bit 1MSPS data acquisition system suitable for applications such as digital audio that require front-ends with very low distortion and noise. The circuit uses a high performance Successive Approximation Register Analog to Digital (...)
User guide: PDF
Schematic: PDF
Package Pins Download
SOIC (D) 8 View options
SOT-23 (DBV) 5 View options
VSSOP (DGK) 8 View options
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