SNOSD33B November 2016  – November 2016 LPV811 , LPV812

PRODUCTION DATA. 

  1. Features
  2. Applications
  3. Description
    1. 3.1Nanopower CO Sensor
    2. 3.2LPV812 Offset Voltage Distribution Front page O2 Sens circuit to Vos Disty Graph
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1Absolute Maximum Ratings
    2. 6.2ESD Ratings
    3. 6.3Recommended Operating Conditions
    4. 6.4Thermal Information
    5. 6.5Electrical Characteristics
    6. 6.6Typical Characteristics
  7. Detailed Description
    1. 7.1Overview
    2. 7.2Functional Block Diagram
    3. 7.3Feature Description
    4. 7.4Device Functional Modes
      1. 7.4.1Negative-Rail Sensing Input
      2. 7.4.2Rail to Rail Output Stage
      3. 7.4.3Design Optimization for Nanopower Operation
      4. 7.4.4Driving Capacitive Load
  8. Application and Implementation
    1. 8.1Application Information
    2. 8.2Typical Application: Three Terminal CO Gas Sensor Amplifier
      1. 8.2.1Design Requirements
      2. 8.2.2Detailed Design Procedure
      3. 8.2.3Application Curve
    3. 8.3Do's and Don'ts
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1Layout Guidelines
    2. 10.2Layout Example
  11. 11Device and Documentation Support
    1. 11.1Device Support
      1. 11.1.1Development Support
    2. 11.2Documentation Support
      1. 11.2.1Related Documentation
    3. 11.3Related Links
    4. 11.4Receiving Notification of Documentation Updates
    5. 11.5Community Resources
    6. 11.6Trademarks
    7. 11.7Electrostatic Discharge Caution
    8. 11.8Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Features

  • Nanopower Supply Current: 425 nA/channel
  • Offset Voltage: 300 µV (max)
  • TcVos: 1 µV/°C
  • Gain-Bandwidth: 8 kHz
  • Unity-Gain Stable
  • Low Input Bias Current : 100 fA
  • Wide Supply Range: 1.6 V to 5.5 V
  • Rail-to-Rail Output
  • No Output Reversals
  • EMI Protection
  • Temperature Range: –40°C to 125°C
  • Industry Standard Packages:
    • Single in 5-pin SOT-23
    • Dual in 8-pin VSSOP

Applications

  • CO and O2 Gas Detectors (TIDA-0756)
  • PIR Motion Detectors
  • Current Sensing
  • Thermostats
  • IoT Remote Sensors
  • Active RFID Readers and Tags
  • Portable Medical Equipment

Description

The LPV811 (single) and LPV812 (dual) are a ultra-low-power precision operational amplifier family for “Always ON” sensing applications in battery powered wireless and low power wired equipment. With 8 kHz of bandwidth from 425 nA of quiescent current and a trimmed offset voltage to under 300µV, the LPV81x amplifiers provide the required precision while minimizing power consumption in equipment such as gas detectors and portable electronic devices where operational battery-life is critical.

In addition to being ultra-low-power, the LPV81x amplifiers have CMOS input stages with fempto-amp bias currents for impedance source applications. The LPV81x amplifiers also feature a negative-rail sensing input stage and a rail-to-rail output stage that swings within millivolts of the rails, maintaining the widest dynamic range possible. EMI protection is designed into the LPV81x in order to reduce system sensitivity to unwanted RF signals from mobile phones, WiFi, radio transmitters, and tag readers.

Device Information(1)

PART NUMBERPACKAGEBODY SIZE
LPV811SOT-23 (5)2.90 mm x 1.60 mm
LPV812VSSOP (8)3.00 mm × 3.00 mm
For all available packages, see the orderable addendum at the end of the data sheet.

LPV8xx Family of Nanopower Amplifiers

PART NUMBER CHANNELSSUPPLY
CURRENT
(Typ/Ch)
OFFSET
VOLTAGE
(Max)
LPV801 1500 nA 3.5 mV
LPV8022320 nA3.5 mV
LPV8111450 nA370 µV
LPV812 2425 nA 300 µV

Nanopower CO Sensor

LPV811 LPV812 O2_Sens_Ckt.gif

LPV812 Offset Voltage Distribution

LPV811 LPV812 812B_Dist_3p3.png