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THS4521

ACTIVE

Very low power rail-to-rail output fully differential amplifier

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Data sheet

THS4521

ACTIVE
Data sheet Order now

Product details

Number of channels (#) 1 Total supply voltage (Min) (+5V=5, +/-5V=10) 2.5 Total supply voltage (Max) (+5V=5, +/-5V=10) 5.5 BW @ Acl (MHz) 145 Acl, min spec gain (V/V) 1 Slew rate (Typ) (V/us) 490 Architecture Fully Differential ADC Driver, Bipolar Vn at flatband (Typ) (nV/rtHz) 4.6 Iq per channel (Typ) (mA) 1.14 Rail-to-rail In to V-, Out Vos (offset voltage @ 25 C) (Max) (mV) 2 Operating temperature range (C) -40 to 85 Output current (Typ) (mA) 55 2nd harmonic (dBc) 133 3rd harmonic (dBc) 141 Frequency of harmonic distortion measurement (MHz) 0.001 GBW (Typ) (MHz) 95 Input bias current (Max) (pA) 900000 Features Shutdown CMRR (Typ) (dB) 102 Rating Catalog
Number of channels (#) 1 Total supply voltage (Min) (+5V=5, +/-5V=10) 2.5 Total supply voltage (Max) (+5V=5, +/-5V=10) 5.5 BW @ Acl (MHz) 145 Acl, min spec gain (V/V) 1 Slew rate (Typ) (V/us) 490 Architecture Fully Differential ADC Driver, Bipolar Vn at flatband (Typ) (nV/rtHz) 4.6 Iq per channel (Typ) (mA) 1.14 Rail-to-rail In to V-, Out Vos (offset voltage @ 25 C) (Max) (mV) 2 Operating temperature range (C) -40 to 85 Output current (Typ) (mA) 55 2nd harmonic (dBc) 133 3rd harmonic (dBc) 141 Frequency of harmonic distortion measurement (MHz) 0.001 GBW (Typ) (MHz) 95 Input bias current (Max) (pA) 900000 Features Shutdown CMRR (Typ) (dB) 102 Rating Catalog
SOIC (D) 8 19 mm² 3.91 x 4.9 VSSOP (DGK) 8 15 mm² 3 x 4.9
  • Fully Differential Architecture
  • Bandwidth: 145 MHz (AV = 1 V/V)
  • Slew Rate: 490 V/µs
  • HD2: –133 dBc at 10 kHz (1 VRMS,
    RL = 1 kΩ)
  • HD3: –141 dBc at 10 kHz (1 VRMS,
    RL = 1 kΩ)
  • Input Voltage Noise: 4.6 nV/√Hz
    (f = 100 kHz)
  • THD+N: –112dBc (0.00025%) at
    1 kHz (22-kHz BW, G = 1, 5 VPP)
  • Open-Loop Gain: 119 dB (DC)
  • NRI–Negative Rail Input
  • RRO–Rail-to-Rail Output
  • Output Common-Mode Control
    (with Low Offset)
  • Power Supply:
    • Voltage: +2.5 V (±1.25 V) to
      +5.5 V (±2.75 V)
    • Current: 1.14 mA/ch
  • Power-Down Capability: 20 µA (typical)
  • Fully Differential Architecture
  • Bandwidth: 145 MHz (AV = 1 V/V)
  • Slew Rate: 490 V/µs
  • HD2: –133 dBc at 10 kHz (1 VRMS,
    RL = 1 kΩ)
  • HD3: –141 dBc at 10 kHz (1 VRMS,
    RL = 1 kΩ)
  • Input Voltage Noise: 4.6 nV/√Hz
    (f = 100 kHz)
  • THD+N: –112dBc (0.00025%) at
    1 kHz (22-kHz BW, G = 1, 5 VPP)
  • Open-Loop Gain: 119 dB (DC)
  • NRI–Negative Rail Input
  • RRO–Rail-to-Rail Output
  • Output Common-Mode Control
    (with Low Offset)
  • Power Supply:
    • Voltage: +2.5 V (±1.25 V) to
      +5.5 V (±2.75 V)
    • Current: 1.14 mA/ch
  • Power-Down Capability: 20 µA (typical)

The THS4521, THS4522, and THS4524 family of devices are very low-power, fully differential amplifiers with rail-to-rail output and an input common-mode range that includes the negative rail. These amplifiers are designed for low-power data acquisition systems and high-density applications where power dissipation is a critical parameter, and provide exceptional performance in audio applications.

The family includes single FDA (THS4521), dual FDA (THS4522), and quad FDA (THS4524) versions.

These fully differential amplifiers feature accurate output common-mode control that allows for dc-coupling when driving analog-to-digital converters (ADCs). This control, coupled with an input common-mode range below the negative rail as well as rail-to-rail output, allows for easy interfacing between single-ended, ground-referenced signal sources. Additionally, these devices are ideally suited for driving both successive-approximation register (SAR) and delta-sigma (ΔΣ) ADCs using only a single +2.5V to +5V and ground power supply.

The THS4521, THS4522, and THS4524 family of fully differential amplifiers is characterized for operation over the full industrial temperature range from –40°C to +85°C.

The THS4521, THS4522, and THS4524 family of devices are very low-power, fully differential amplifiers with rail-to-rail output and an input common-mode range that includes the negative rail. These amplifiers are designed for low-power data acquisition systems and high-density applications where power dissipation is a critical parameter, and provide exceptional performance in audio applications.

The family includes single FDA (THS4521), dual FDA (THS4522), and quad FDA (THS4524) versions.

These fully differential amplifiers feature accurate output common-mode control that allows for dc-coupling when driving analog-to-digital converters (ADCs). This control, coupled with an input common-mode range below the negative rail as well as rail-to-rail output, allows for easy interfacing between single-ended, ground-referenced signal sources. Additionally, these devices are ideally suited for driving both successive-approximation register (SAR) and delta-sigma (ΔΣ) ADCs using only a single +2.5V to +5V and ground power supply.

The THS4521, THS4522, and THS4524 family of fully differential amplifiers is characterized for operation over the full industrial temperature range from –40°C to +85°C.
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Technical documentation

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Type Title Date
* Data sheet THS452x Very Low Power, Negative Rail Input, Rail-To-Rail Output, Fully Differential Amplifier datasheet (Rev. H) PDF | HTML 18 Jun 2015
Circuit design High-speed overcurrent detection circuit (Rev. A) 17 Jan 2019
E-book The Signal e-book: A compendium of blog posts on op amp design topics 28 Mar 2017
Technical article How to minimize filter loss when you drive an ADC 20 Oct 2016
Application note Fully-Differential Amplifiers (Rev. E) 19 Sep 2016
Technical article Go differential to differentiate your precision design 11 Aug 2016
Technical article How to use a fully differential amplifier as a level shifter 13 Jul 2016
Technical article What you need to know about internal ESD protection on integrated circuits 02 Dec 2015
More literature Featured High Speed Differential Amplifiers 23 Oct 2012
Analog Design Journal Converting single-ended video to differential video in single-supply systems 16 Sep 2011
Analog Design Journal Using single-supply fully diff. amps with neg. input voltages to drive ADCs 15 Nov 2010
Application note DC Output Errors in a Fully-Differential Amplifier 25 May 2010
Analog Design Journal Using fully differential op amps as attenuators, Part 3 04 Oct 2009
EVM User's guide THS4521/45222/4524EVM User's Guide 16 Jul 2009
Analog Design Journal Using fully differential op amps as attenuators, Part 2 14 Jul 2009
Analog Design Journal Using fully differential op amps as attenuators, Part 1 01 May 2009
Analog Design Journal Analysis of fully differential amplifiers 11 Mar 2005
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

Design & development

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Evaluation board

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User guide: PDF
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THS4521 TINA-TI Spice Model (Rev. D)

SBOM342D.ZIP (16 KB) - TINA-TI Spice Model
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SBOR022.ZIP (1639 KB)
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SOIC (D) 8 View options
VSSOP (DGK) 8 View options

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