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LMP7721

ACTIVE

3 Femtoampere Input Bias Current Precision Amplifier

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Data sheet

LMP7721

ACTIVE
Data sheet Order now

Product details

Number of channels (#) 1 Total supply voltage (Max) (+5V=5, +/-5V=10) 5.5 Total supply voltage (Min) (+5V=5, +/-5V=10) 1.8 Vos (offset voltage @ 25 C) (Max) (mV) 0.15 GBW (Typ) (MHz) 17 Slew rate (Typ) (V/us) 10.43 Rail-to-rail In to V-, Out Offset drift (Typ) (uV/C) 1.5 Iq per channel (Typ) (mA) 1.3 Vn at 1 kHz (Typ) (nV/rtHz) 6.5 CMRR (Typ) (dB) 100 Rating Catalog Operating temperature range (C) -40 to 125 Input bias current (Max) (pA) 0.02 Output current (Typ) (mA) 22 Architecture CMOS THD + N @ 1 kHz (Typ) (%) 0.0007
Number of channels (#) 1 Total supply voltage (Max) (+5V=5, +/-5V=10) 5.5 Total supply voltage (Min) (+5V=5, +/-5V=10) 1.8 Vos (offset voltage @ 25 C) (Max) (mV) 0.15 GBW (Typ) (MHz) 17 Slew rate (Typ) (V/us) 10.43 Rail-to-rail In to V-, Out Offset drift (Typ) (uV/C) 1.5 Iq per channel (Typ) (mA) 1.3 Vn at 1 kHz (Typ) (nV/rtHz) 6.5 CMRR (Typ) (dB) 100 Rating Catalog Operating temperature range (C) -40 to 125 Input bias current (Max) (pA) 0.02 Output current (Typ) (mA) 22 Architecture CMOS THD + N @ 1 kHz (Typ) (%) 0.0007
SOIC (D) 8 19 mm² 4.9 x 3.9
  • Unless Otherwise Noted, Typical Values at TA =
    25°C, VS = 5 V.
  • Input Bias Current (VCM = 1 V)
    • Maximum at 25°C ±20 fA
    • Maximum at 85°C ±900 fA
  • Offset Voltage ±26 µV
  • Offset Voltage Drift – 1.5 µV/°C
  • DC Open-Loop Gain 120 dB
  • DC CMRR 100 dB
  • Input Voltage Noise (at f = 1 kHz) 6.5 nV/√Hz
  • THD 0.0007%
  • Supply Current 1.3 mA
  • GBW 17 MHz
  • Slew Rate (Falling Edge) 12.76 V/µs
  • Supply Voltage 1.8 V to 5.5 V
  • Operating Temperature Range –40°C to 125°C
  • 8-Pin SOIC
  • Unless Otherwise Noted, Typical Values at TA =
    25°C, VS = 5 V.
  • Input Bias Current (VCM = 1 V)
    • Maximum at 25°C ±20 fA
    • Maximum at 85°C ±900 fA
  • Offset Voltage ±26 µV
  • Offset Voltage Drift – 1.5 µV/°C
  • DC Open-Loop Gain 120 dB
  • DC CMRR 100 dB
  • Input Voltage Noise (at f = 1 kHz) 6.5 nV/√Hz
  • THD 0.0007%
  • Supply Current 1.3 mA
  • GBW 17 MHz
  • Slew Rate (Falling Edge) 12.76 V/µs
  • Supply Voltage 1.8 V to 5.5 V
  • Operating Temperature Range –40°C to 125°C
  • 8-Pin SOIC

The LMP7721 is the industry’s lowest specified input bias current precision amplifier. The ultra-low input bias current is 3 fA, with a specified limit of ±20 fA at 25°C and ±900 fA at 85°C. This is achieved with the latest patent-pending technology of input bias current cancellation amplifier circuitry. This technology also maintains the ultra-low input bias current over the entire input common-mode voltage range of the amplifier.

Other outstanding features, such as low voltage noise (6.5 nV/√Hz), low DC-offset voltage (±150 µV maximum at 25°C) and low-offset voltage temperature coefficient (–1.5 µV/°C), improve system sensitivity and accuracy in high-precision applications. With a supply voltage range of 1.8 V to 5.5 V, the LMP7721 is the ideal choice for battery-operated, portable applications. The LMP7721 is part of the LMP precision amplifier family.

As part of Texas Instruments’ PowerWise™ products, the LMP7721 provides the remarkably wide-gain bandwidth product (GBW) of 17 MHz while consuming only 1.3 mA of current. This wide GBW along with the high open-loop gain of 120 dB enables accurate signal conditioning. With these specifications, the LMP7721 has the performance to excel in a wide variety of applications such as electrochemical cell amplifiers and sensor interface circuits.

The LMP7721 is offered in an 8-pin SOIC package with a special pinout that isolates the amplifier’s input from the power supply and output pins. With proper board layout techniques, the unique pinout of the LMP7721 will prevent PCB leakage current from reaching the input pins. Thus system error will be further reduced.

The LMP7721 is the industry’s lowest specified input bias current precision amplifier. The ultra-low input bias current is 3 fA, with a specified limit of ±20 fA at 25°C and ±900 fA at 85°C. This is achieved with the latest patent-pending technology of input bias current cancellation amplifier circuitry. This technology also maintains the ultra-low input bias current over the entire input common-mode voltage range of the amplifier.

Other outstanding features, such as low voltage noise (6.5 nV/√Hz), low DC-offset voltage (±150 µV maximum at 25°C) and low-offset voltage temperature coefficient (–1.5 µV/°C), improve system sensitivity and accuracy in high-precision applications. With a supply voltage range of 1.8 V to 5.5 V, the LMP7721 is the ideal choice for battery-operated, portable applications. The LMP7721 is part of the LMP precision amplifier family.

As part of Texas Instruments’ PowerWise™ products, the LMP7721 provides the remarkably wide-gain bandwidth product (GBW) of 17 MHz while consuming only 1.3 mA of current. This wide GBW along with the high open-loop gain of 120 dB enables accurate signal conditioning. With these specifications, the LMP7721 has the performance to excel in a wide variety of applications such as electrochemical cell amplifiers and sensor interface circuits.

The LMP7721 is offered in an 8-pin SOIC package with a special pinout that isolates the amplifier’s input from the power supply and output pins. With proper board layout techniques, the unique pinout of the LMP7721 will prevent PCB leakage current from reaching the input pins. Thus system error will be further reduced.
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Technical documentation

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Type Title Date
* Data sheet LMP7721 3-Femtoampere Input Bias Current Precision Amplifier datasheet (Rev. E) PDF | HTML 15 Dec 2014
Circuit design Low-input bias-current front end SAR ADC circuit (Rev. A) 11 Mar 2019
Circuit design Photodiode amplifier circuit (Rev. A) 04 Feb 2019
E-book The Signal e-book: A compendium of blog posts on op amp design topics 28 Mar 2017
Technical article Minimize your current, pick a sweet spot! 03 Sep 2014
EVM User's guide AN-1796 LMP7721 Evaluation Board (Rev. C) 01 May 2013
Application note AN-1798 Designing with Electro-Chemical Sensors (Rev. C) 01 May 2013
Application note AN-1852 Designing With pH Electrodes (Rev. A) 01 May 2013
More literature Die D/S LMP7721-MDC Femtoampere Input Bias Currect Precision Amplifier 08 Jan 2013
EVM User's guide LMP7721 Multi-Function Evaluation Board 26 Jan 2012

Design & development

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Evaluation board

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SOIC (D) 8 View options

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