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精密度運算放大器 (Vos<1mV)

LMP7721

現行

3 飛安培輸入偏壓電流精密放大器

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產品規格表

LMP7721

現行
產品規格表 立即訂購

產品詳細資料

Number of channels 1 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 5.5 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 1.8 Vos (offset voltage at 25°C) (max) (mV) 0.15 GBW (typ) (MHz) 17 Slew rate (typ) (V/µs) 10.43 Rail-to-rail In to V-, Out Offset drift (typ) (µV/°C) 1.5 Iq per channel (typ) (mA) 1.3 Vn at 1 kHz (typ) (nV√Hz) 6.5 CMRR (typ) (dB) 100 Rating Catalog Operating temperature range (°C) -40 to 125 Input bias current (max) (pA) 0.02 Iout (typ) (A) 0.022 Architecture CMOS Input common mode headroom (to negative supply) (typ) (V) -0.3 Input common mode headroom (to positive supply) (typ) (V) -1 Output swing headroom (to negative supply) (typ) (V) 0.02 Output swing headroom (to positive supply) (typ) (V) -0.02 THD + N at 1 kHz (typ) (%) 0.0007
Number of channels 1 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 5.5 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 1.8 Vos (offset voltage at 25°C) (max) (mV) 0.15 GBW (typ) (MHz) 17 Slew rate (typ) (V/µs) 10.43 Rail-to-rail In to V-, Out Offset drift (typ) (µV/°C) 1.5 Iq per channel (typ) (mA) 1.3 Vn at 1 kHz (typ) (nV√Hz) 6.5 CMRR (typ) (dB) 100 Rating Catalog Operating temperature range (°C) -40 to 125 Input bias current (max) (pA) 0.02 Iout (typ) (A) 0.022 Architecture CMOS Input common mode headroom (to negative supply) (typ) (V) -0.3 Input common mode headroom (to positive supply) (typ) (V) -1 Output swing headroom (to negative supply) (typ) (V) 0.02 Output swing headroom (to positive supply) (typ) (V) -0.02 THD + N at 1 kHz (typ) (%) 0.0007
SOIC (D) 8 29.4 mm² 4.9 x 6
  • 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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類型 標題 日期
* Data sheet LMP7721 3-Femtoampere Input Bias Current Precision Amplifier datasheet (Rev. E) PDF | HTML 2014年 12月 15日
Circuit design Photodiode Amplifier Circuit (Rev. B) PDF | HTML 2024年 5月 2日
Circuit design Low-input bias-current front end SAR ADC circuit (Rev. A) 2019年 3月 11日
E-book The Signal e-book: A compendium of blog posts on op amp design topics 2017年 3月 28日
EVM User's guide AN-1796 LMP7721 Evaluation Board (Rev. C) 2013年 5月 1日
Application note AN-1798 Designing with Electro-Chemical Sensors (Rev. C) 2013年 5月 1日
Application note AN-1852 Designing With pH Electrodes (Rev. A) 2013年 5月 1日
More literature Die D/S LMP7721-MDC Femtoampere Input Bias Currect Precision Amplifier 2013年 1月 8日
EVM User's guide LMP7721 Multi-Function Evaluation Board 2012年 1月 26日

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