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LPV821

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650nA, Precision Zero-Drift Nanopower Amplifier

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Data sheet

LPV821

ACTIVE
Data sheet Order now

Product details

Number of channels 1 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 3.6 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 1.7 Vos (offset voltage at 25°C) (max) (mV) 0.01 Offset drift (typ) (µV/°C) 0.02 GBW (typ) (MHz) 0.008 Features EMI Hardened, Zero Drift Slew rate (typ) (V/µs) 0.0033 Rail-to-rail In, Out Iq per channel (typ) (mA) 0.00065 Vn at 1 kHz (typ) (nV√Hz) 215 CMRR (typ) (dB) 125 Rating Catalog Operating temperature range (°C) -40 to 125 Iout (typ) (A) 0.021 Architecture CMOS Input common mode headroom (to negative supply) (typ) (V) 0 Input common mode headroom (to positive supply) (typ) (V) 0 Output swing headroom (to negative supply) (typ) (V) 0.012 Output swing headroom (to positive supply) (typ) (V) -0.012
Number of channels 1 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 3.6 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 1.7 Vos (offset voltage at 25°C) (max) (mV) 0.01 Offset drift (typ) (µV/°C) 0.02 GBW (typ) (MHz) 0.008 Features EMI Hardened, Zero Drift Slew rate (typ) (V/µs) 0.0033 Rail-to-rail In, Out Iq per channel (typ) (mA) 0.00065 Vn at 1 kHz (typ) (nV√Hz) 215 CMRR (typ) (dB) 125 Rating Catalog Operating temperature range (°C) -40 to 125 Iout (typ) (A) 0.021 Architecture CMOS Input common mode headroom (to negative supply) (typ) (V) 0 Input common mode headroom (to positive supply) (typ) (V) 0 Output swing headroom (to negative supply) (typ) (V) 0.012 Output swing headroom (to positive supply) (typ) (V) -0.012
SOT-23 (DBV) 5 8.12 mm² (2.9 mm × 2.8 mm)
  • Quiescent Current: 650 nA
  • Low Offset Voltage: ±10 µV (Maximum)
  • Offset Voltage Drift: ±0.096 µV/°C (Maximum)
  • 0.1-Hz to 10-Hz Noise: 3.9 µVPP
  • Input Bias Current: ±7 pA
  • Gain Bandwidth: 8 kHz
  • Supply Voltage: 1.7 V to 3.6 V
  • Rail-to-Rail Input/Output
  • Industry Standard Package
    • Single in 5-pin SOT-23
  • EMI Hardened
  • Quiescent Current: 650 nA
  • Low Offset Voltage: ±10 µV (Maximum)
  • Offset Voltage Drift: ±0.096 µV/°C (Maximum)
  • 0.1-Hz to 10-Hz Noise: 3.9 µVPP
  • Input Bias Current: ±7 pA
  • Gain Bandwidth: 8 kHz
  • Supply Voltage: 1.7 V to 3.6 V
  • Rail-to-Rail Input/Output
  • Industry Standard Package
    • Single in 5-pin SOT-23
  • EMI Hardened

The LPV821 is a single-channel, nanopower, zero-drift operational amplifier for “Always ON” sensing applications in wireless and wired equipment where low input offset is required. With the combination of low initial offset, low offset drift, and 8 kHz of bandwidth from 650 nA of quiescent current, the LPV821 is the industry’s lowest power zero-drift amplifier that can be used for end equipment that monitor current consumption, temperature, gas, or strain gauges.

The LPV821 zero-drift operational amplifier uses a proprietary auto-calibration technique to simultaneously provide low offset voltage (10 µV, maximum) and minimal drift over time and temperature. In addition to having low offset and ultra-low quiescent current, the LPV821 amplifier has pico-amp bias currents which reduce errors commonly introduced in applications monitoring sensors with high output impedance and amplifier configurations with megaohm feedback resistors.

The LPV821 amplifier also features an input stage with rail-to-rail input common mode range and an output stage that swings within 12 mV of the rails, maintaining the widest dynamic range possible. The device is EMI hardened to reduce system sensitivity to unwanted RF signals from mobile phones, WiFi, radio transmitters, and tag readers.

The LPV821 zero-drift amplifier operates with a single supply voltage as low as 1.7V, ensuring continuous performance in low battery situations over the extended temperature range of -40ºC to 125ºC. The LPV821 (single) is available in industry standard 5-pin SOT-23.

 

The LPV821 is a single-channel, nanopower, zero-drift operational amplifier for “Always ON” sensing applications in wireless and wired equipment where low input offset is required. With the combination of low initial offset, low offset drift, and 8 kHz of bandwidth from 650 nA of quiescent current, the LPV821 is the industry’s lowest power zero-drift amplifier that can be used for end equipment that monitor current consumption, temperature, gas, or strain gauges.

The LPV821 zero-drift operational amplifier uses a proprietary auto-calibration technique to simultaneously provide low offset voltage (10 µV, maximum) and minimal drift over time and temperature. In addition to having low offset and ultra-low quiescent current, the LPV821 amplifier has pico-amp bias currents which reduce errors commonly introduced in applications monitoring sensors with high output impedance and amplifier configurations with megaohm feedback resistors.

The LPV821 amplifier also features an input stage with rail-to-rail input common mode range and an output stage that swings within 12 mV of the rails, maintaining the widest dynamic range possible. The device is EMI hardened to reduce system sensitivity to unwanted RF signals from mobile phones, WiFi, radio transmitters, and tag readers.

The LPV821 zero-drift amplifier operates with a single supply voltage as low as 1.7V, ensuring continuous performance in low battery situations over the extended temperature range of -40ºC to 125ºC. The LPV821 (single) is available in industry standard 5-pin SOT-23.

 
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Technical documentation

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* Data sheet LPV821, 650nA, Precision, Nanopower, Zero-Drift Amplifier datasheet (Rev. A) PDF | HTML Dec 15, 2017
Circuit design Low-power, bidirectional current-sensing circuit (Rev. B) PDF | HTML Oct 2, 2024
Circuit design Single-supply, low-side, unidirectional current-sensing circuit (Rev. A) PDF | HTML Sep 26, 2024
Application brief Zero-Drift Amplifiers: Features and Benefits (Rev. C) Jan 28, 2021
Application note Nano-Power Transimpedance Amplifier for Current Output Sensors Mar 7, 2018
Application brief GPIO Pins Power Signal Chain in Personal Electronics Running on Li-Ion Batteries Feb 12, 2018
Technical article How to make precision measurements on a nanopower budget, part 2: current sensing PDF | HTML Feb 8, 2018
Application brief Simplifying Environmental Measurements in Power Conscious Factory and Building A (Rev. A) Jan 9, 2018
Application note Advantages of using Nanopower Zero Drift Amp for Mobile Phone Battery Voltage Mo (Rev. A) Dec 21, 2017
Technical article How to make precision measurements on a nanopower budget, part 1: DC gain in nanop PDF | HTML Dec 6, 2017
Application note Current Sensing in No-Neutral Light Switches (Rev. A) Oct 16, 2017

Design & development

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

Evaluation board

AMP-PDK-EVM — Amplifier performance development kit evaluation module

The amplifier performance development kit (PDK) is an evaluation module (EVM) kit to test common operational amplifier (op amp) parameters and is compatible with most op amps and comparators. The EVM kit offers a main board with several socketed daughtercard options to fit package needs, allowing (...)

User guide: PDF | HTML
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Simulation model

Comparator Over Current Detection TINA-TI Reference Design (Rev. A)

SBOMAH9A.TSC (44 KB) - TINA-TI reference design
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Simulation model

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SNOM630B.ZIP (31 KB) - PSpice model
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Simulation model

LPV821 TINA-TI Reference Design (Rev. B)

SNOM629B (315 KB) - TINA-TI reference design
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Simulation model

LPV821 TINA-TI Spice Model (Rev. B)

SNOM631B.ZIP (10 KB) - TINA-TI Spice model
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Calculation tool

OPAMP-NOISECALC — Noise Calculator

This folder contains three tools to help in understandning and managing noise in cicuits. The included tools are:

  • A noise generator tool - This is a Lab View 4-Run Time executable that generates Gaussian white noise, uniform white noise, 1/f noise, short noise, and 60Hz line noise. Temporal data, (...)
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Design tool

CIRCUIT060001 — Single-supply, low-side, unidirectional current-sensing circuit

This single–supply, low–side, current sensing solution accurately detects load current up to 1A and converts it to a voltage between 50mV and 4.9V. The input current range and output voltage range can be scaled as necessary and larger supplies can be used to accommodate larger swings.
Supported products & hardware
Design tool

CIRCUIT060003 — Temperature sensing with PTC thermistor circuit

This temperature sensing circuit uses a resistor in series with a positive–temperature–coefficient (PTC) thermistor to form a voltage–divider, which has the effect of producing an output voltage that is linear over temperature. The circuit uses an op amp in a non–inverting (...)
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Design tool

CIRCUIT060007 — Low-side bidirectional current-sensing circuit

This single-supply, low-side, bidirectional, current-sensing solution can accurately detect load currents from –1 A to 1 A. The linear range of the output is from 110 mV to 3.19 V. Low-side current sensing keeps the common-mode voltage near ground, and is thus most useful in applications with (...)

Supported products & hardware
Design tool

CIRCUIT060077 — Low-power, bidirectional current sensing circuit

This low-power, low-side, bidirectional current sensing solution uses two nano-power, zero-drift amplifiers (LPV821) and one micro-power comparator with an integrated, precision reference (TLV3012). This circuit is well-suited for battery powered devices where charging current and system current (...)
Supported products & hardware
Reference design

TIDA-010019 — RTD replacement for cold junction compensation reference design in a temperature sensor

Temperature-sensing applications that use a thermocouple (TC) require an accurate local temperature sensor to achieve high accuracy. Solutions for design challenges such as cold-junction compensation (CJC) or including an ultra-low power TC analog front-end are highlighted and addressed in this (...)
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Package Pins CAD symbols, footprints & 3D models
SOT-23 (DBV) 5 Ultra Librarian
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