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.
| 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 |
For additional terms or required resources, click any title below to view the detail page where available.
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| Package | Pins | Download |
|---|---|---|
| SOIC (D) | 8 | View options |
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