SNOSD33B November   2016  – November 2016 LPV811 , LPV812

PRODUCTION DATA.  

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

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

1 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

2 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

3 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 NUMBER PACKAGE BODY SIZE
LPV811 SOT-23 (5) 2.90 mm x 1.60 mm
LPV812 VSSOP (8) 3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at the end of the data sheet.

LPV8xx Family of Nanopower Amplifiers

PART NUMBER CHANNELS SUPPLY
CURRENT
(Typ/Ch)		 OFFSET
VOLTAGE
(Max)
LPV801 1 500 nA 3.5 mV
LPV802 2 320 nA 3.5 mV
LPV811 1 450 nA 370 µV
LPV812 2 425 nA 300 µV

3.1 Nanopower CO Sensor

LPV811 LPV812 O2_Sens_Ckt.gif

3.2 LPV812 Offset Voltage Distribution

LPV811 LPV812 812B_Dist_3p3.png