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V S

Load

Current

+

VOUT

Vcc

Rshunt

R1

R3

+

Vshunt

R4

LPV821

Vbias

R2

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Design

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

LPV821

SNOSD36A – AUGUST 2017 – REVISED DECEMBER 2017

LPV821, 650nA, Precision, Nanopower, Zero-Drift Amplifier

1

1 Features

1

•

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

2 Applications

•

Battery-Powered Instruments

•

Gas Detection

•

Process Analytics

•

Fault Monitoring

•

Current Sensing

–

Shunt Resistor

–

Current Transformer

•

Temperature Measurements

–

High Impedance Thermistors

–

RTD's, Thermocouples

•

Strain Gauges

–

Electronic Scales

–

Pressure Sensors

3 Description

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.

Device Information(1)

PART

NUMBER

CHAN

COUNT

PACKAGE

BODY SIZE (NOM)

LPV821

1

SOT-23 (5)

2.90 mm × 1.60 mm

LPV822 (2)

2

WSON (8)

2.00 mm × 2.00 mm

Precision Nano-Power Amplifier Family

FAMILY

CHAN

COUNT

IQ PER

CHAN

VOS (MAX)

VSUPPLY

LPV821

1

650 nA

10 µV

1.7 to 3.6 V

LPV811

1

450 nA

370 µV

1.6 to 5.5 V

LPV812

2

425 nA

300 µV

1.6 to 5.5 V

OPA369

1,2

800 nA

750 µV

1.8 to 5.5 V

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

(2) Planned for near-future release

Low-Side, Always-On Current Sense