Product details

Architecture Current FB Number of channels (#) 1 Total supply voltage (Min) (+5V=5, +/-5V=10) 14 Total supply voltage (Max) (+5V=5, +/-5V=10) 32 GBW (Typ) (MHz) 900 BW @ Acl (MHz) 900 Acl, min spec gain (V/V) 1 Slew rate (Typ) (V/us) 8000 Vn at flatband (Typ) (nV/rtHz) 1.85 Vn at 1 kHz (Typ) (nV/rtHz) 3 Iq per channel (Typ) (mA) 17.1 Vos (offset voltage @ 25 C) (Max) (mV) 2 Rail-to-rail No Features Shutdown Rating Catalog Operating temperature range (C) -40 to 85 CMRR (Typ) (dB) 75 Input bias current (Max) (pA) 5000000 Offset drift (Typ) (uV/C) 3 Output current (Typ) (mA) 420 2nd harmonic (dBc) 76 3rd harmonic (dBc) 69 @ MHz 50
Architecture Current FB Number of channels (#) 1 Total supply voltage (Min) (+5V=5, +/-5V=10) 14 Total supply voltage (Max) (+5V=5, +/-5V=10) 32 GBW (Typ) (MHz) 900 BW @ Acl (MHz) 900 Acl, min spec gain (V/V) 1 Slew rate (Typ) (V/us) 8000 Vn at flatband (Typ) (nV/rtHz) 1.85 Vn at 1 kHz (Typ) (nV/rtHz) 3 Iq per channel (Typ) (mA) 17.1 Vos (offset voltage @ 25 C) (Max) (mV) 2 Rail-to-rail No Features Shutdown Rating Catalog Operating temperature range (C) -40 to 85 CMRR (Typ) (dB) 75 Input bias current (Max) (pA) 5000000 Offset drift (Typ) (uV/C) 3 Output current (Typ) (mA) 420 2nd harmonic (dBc) 76 3rd harmonic (dBc) 69 @ MHz 50
HSOIC (DDA) 8 19 mm² 4.9 x 3.9 VQFN (RGT) 16 9 mm² 3 x 3
  • Bandwidth:
    • 900 MHz (VO = 2 VPP, AV = 5 V/V)
    • 320 MHz (VO = 10 VPP, AV = 5 V/V)
  • Slew Rate: 8000 V/µs (VO = 20 VPP)
  • Input Voltage Noise: 1.7 nV/√Hz
  • Bipolar Supply Range: ±7 V to ±16 V
  • Single-Supply Range: 14 V to 32 V
  • Output Swing: 28 VPP (±16-V Supplies, 100-Ω Load)
  • Linear Output Current: ±420 mA (Typical)
  • 16.8-mA Trimmed Supply Current (Low Temperature Coefficient)
  • HD2 and HD3: Less Than –75 dBc (50 MHz, VO = 10 VPP, 100-Ω Load)
  • Rise and Fall Time: 1.3 ns (10-V Step)
  • Overshoot: 1.5% (10-V Step, AV = 5 V/V)
  • Current Limit and Thermal Shutdown Protection
  • Power Down Feature
  • Bandwidth:
    • 900 MHz (VO = 2 VPP, AV = 5 V/V)
    • 320 MHz (VO = 10 VPP, AV = 5 V/V)
  • Slew Rate: 8000 V/µs (VO = 20 VPP)
  • Input Voltage Noise: 1.7 nV/√Hz
  • Bipolar Supply Range: ±7 V to ±16 V
  • Single-Supply Range: 14 V to 32 V
  • Output Swing: 28 VPP (±16-V Supplies, 100-Ω Load)
  • Linear Output Current: ±420 mA (Typical)
  • 16.8-mA Trimmed Supply Current (Low Temperature Coefficient)
  • HD2 and HD3: Less Than –75 dBc (50 MHz, VO = 10 VPP, 100-Ω Load)
  • Rise and Fall Time: 1.3 ns (10-V Step)
  • Overshoot: 1.5% (10-V Step, AV = 5 V/V)
  • Current Limit and Thermal Shutdown Protection
  • Power Down Feature

The THS3491 current feedback amplifier (CFA) provides a new level of performance for applications requiring the lowest distortion at high output power levels from DC through values greater than 100 MHz at 100-Ω loads. Although specified at a gain of 5 V/V, this current feedback design holds near constant bandwidth and distortion over a wide range of gains.

The 8000 V/µs of slew rate delivers an output of 10 VPP into demanding loads with low distortion through 100 MHz. The 900-MHz, small-signal bandwidth delivers a low overshoot of less than 1.5% for a 10-V step, and rise and fall times of less than 1.3 ns. Peak output current drive values greater than 500 mA enable driving heavy capacitive loads with fast signals.

New designs benefit from the lowest distortion using the VQFN-16 (RGT) package, whereas the 8-pin HSOIC (DDA) package (with PowerPAD™) upgrades existing THS3091 or THS3095 designs. Lower output headroom for the THS3491 provides more output swing on the same ±15-V supplies versus legacy THS3091 or THS3095 options.

The THS3491 current feedback amplifier (CFA) provides a new level of performance for applications requiring the lowest distortion at high output power levels from DC through values greater than 100 MHz at 100-Ω loads. Although specified at a gain of 5 V/V, this current feedback design holds near constant bandwidth and distortion over a wide range of gains.

The 8000 V/µs of slew rate delivers an output of 10 VPP into demanding loads with low distortion through 100 MHz. The 900-MHz, small-signal bandwidth delivers a low overshoot of less than 1.5% for a 10-V step, and rise and fall times of less than 1.3 ns. Peak output current drive values greater than 500 mA enable driving heavy capacitive loads with fast signals.

New designs benefit from the lowest distortion using the VQFN-16 (RGT) package, whereas the 8-pin HSOIC (DDA) package (with PowerPAD™) upgrades existing THS3091 or THS3095 designs. Lower output headroom for the THS3491 provides more output swing on the same ±15-V supplies versus legacy THS3091 or THS3095 options.

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Technical documentation

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Type Title Date
* Data sheet THS3491 900-MHz, 500-mA High-Power Output Current Feedback Amplifier datasheet (Rev. B) 03 Jul 2018
Technical article 3 common questions when designing with high-speed amplifiers 17 Jul 2020
Technical article How to reduce distortion in high-voltage, high-frequency signal generation for AWGs 30 Oct 2018
Technical article What are the advantages of using JFET-input amplifiers in high-speed applications? 19 Jun 2018
Technical article Unique active mux capability combines buffer and switch into one solution 10 Oct 2017
User guide THS3491RGT EVM User's Guide 09 Aug 2017
User guide THS3491DDA EVM User's Guide 08 Aug 2017
Application note Load Sharing Concepts: Implementation for Large-Signal Applications 05 Oct 2011
Application note Noise Analysis for High Speed Op Amps (Rev. A) 17 Jan 2005

Design & development

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

Evaluation board

THS3491DDAEVM — THS3491DDA evaluation module

The THS3491DDA evaluation module (EVM) is used to evaluate the THS3491 device, which is a highspeed, high-voltage and low-distortion current-feedback amplifier in an 8-pin DDA package. The EVM is designed to quickly and easily demonstrate the functionality and performance of THS3491 in a gain of 5 (...)
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Evaluation board

THS3491RGTEVM — THS3491RGT Evaluation Module

The THS3491RGT evaluation module (EVM) is used to evaluate the THS3491 device, which is a high speed, high-voltage and low-distortion current-feedback amplifier in an 16-pin RGT package. The EVM is designed to quickly and easily demonstrate the functionality and performance of THS3491 in a gain of (...)
In stock
Limit: 1
Simulation model

THS3491DDA TINA-TI Reference Design (Rev. A)

SBOMAI4A.TSC (1189 KB) - TINA-TI Reference Design
Simulation model

THS3491DDA TINA-TI Spice Model (Rev. A)

SBOMAI5A.ZIP (11 KB) - TINA-TI Spice Model
Simulation model

THS3491RGT TINA-TI Reference Design

SBOMAN3.TSC (344 KB) - TINA-TI Reference Design
Simulation model

THS3491RGT TINA-TI Spice Model

SBOMAN4.ZIP (11 KB) - TINA-TI Spice Model
Simulation model

THS3491 PSpice Model

SBOMBP9.ZIP (150 KB) - PSpice Model
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 (...)
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 (...)
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 op-amp gain with feedback (...)
Calculation tool

VOLT-DIVIDER-CALC — Voltage Divider Determines A Set of Resistors for a Voltage Divider

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. This calculator can also be used to design non-inverting attentuation circuits.

(...)

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Reference designs

TIDA-060002 — 100-MHz, 1 A Output current driver reference design for high capacitive load applications

This reference design uses the THS3491 high-speed, high-voltage current feedback amplifier to demonstrate an output current drive capability of greater than 1 A into a low-resistive or high-capacitive load while maintaining a large signal bandwidth of 100 MHz at 20 VPP. The high output (...)
Package Pins Download
SO PowerPAD (DDA) 8 View options
VQFN (RGT) 16 View options

Ordering & quality

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