SBOS632 September 2015 INA188

UNLESS OTHERWISE NOTED, this document contains PRODUCTION DATA. 

  1. Features
  2. Applications
  3. Description
  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: VS = ±4 V to ±18 V (VS = 8 V to 36 V)
    6. 6.6Electrical Characteristics: VS = ±2 V to < ±4 V (VS = 4 V to < 8 V)
    7. 6.7Typical Characteristics
  7. Detailed Description
    1. 7.1Overview
    2. 7.2Functional Block Diagram
    3. 7.3Feature Description
      1. 7.3.1Inside the INA188
      2. 7.3.2Setting the Gain
        1. 7.3.2.1Gain Drift
      3. 7.3.3Zero Drift Topology
        1. 7.3.3.1Internal Offset Correction
        2. 7.3.3.2Noise Performance
        3. 7.3.3.3Input Bias Current Clock Feedthrough
      4. 7.3.4 EMI Rejection
      5. 7.3.5Input Protection and Electrical Overstress
      6. 7.3.6Input Common-Mode Range
    4. 7.4Device Functional Modes
      1. 7.4.1Single-Supply Operation
      2. 7.4.2Offset Trimming
      3. 7.4.3Input Bias Current Return Path
      4. 7.4.4Driving the Reference Pin
      5. 7.4.5Error Sources Example
  8. Application and Implementation
    1. 8.1Application Information
    2. 8.2Typical Application
      1. 8.2.1Design Requirements
      2. 8.2.2Detailed Design Procedure
      3. 8.2.3Application Curve
  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. 11.3Community Resources
    4. 11.4Trademarks
    5. 11.5Electrostatic Discharge Caution
    6. 11.6Glossary
  12. 12Mechanical, Packaging, and Orderable Information

1 Features

  • Excellent DC Performance:
    • Low Input Offset Voltage: 55 μV (max)
    • Low Input Offset Drift: 0.2 μV/°C (max)
    • High CMRR: 104 dB, G ≥ 10 (min)
  • Low Input Noise:
    • 12 nV/√Hz at 1 kHz
    • 0.25 μVPP (0.1 Hz to 10 Hz)
  • Wide Supply Range:
    • Single Supply: 4 V to 36 V
    • Dual Supply: ±2 V to ±18 V
  • Gain Set with a Single External Resistor:
    • Gain Equation: G = 1 + (50 kΩ / RG)
    • Gain Error: 0.007%, G = 1
    • Gain Drift: 5 ppm/°C (max) G = 1
  • Input Voltage: (V–) + 0.1 V to (V+) – 1.5 V
  • RFI-Filtered Inputs
  • Rail-to-Rail Output
  • Low Quiescent Current: 1.4 mA
  • Operating Temperature: –55°C to +150°C
  • SOIC-8 and DFN-8 Packages

2 Applications

  • Bridge Amplifiers
  • ECG Amplifiers
  • Pressure Sensors
  • Medical Instrumentation
  • Portable Instrumentation
  • Weigh Scales
  • Thermocouple Amplifiers
  • RTD Sensor Amplifiers
  • Data Acquisition

3 Description

The INA188 is a precision instrumentation amplifier that uses TI proprietary auto-zeroing techniques to achieve low offset voltage, near-zero offset and gain drift, excellent linearity, and exceptionally low-noise density (12 nV/√Hz) that extends down to dc.

The INA188 is optimized to provide excellent common-mode rejection of greater than 104 dB (G ≥ 10). Superior common-mode and supply rejection supports high-resolution, precise measurement applications. The versatile three op-amp design offers a rail-to-rail output, low-voltage operation from a 4-V single supply as well as dual supplies up to ±18 V, and a wide, high-impedance input range. These specifications make this device ideal for universal signal measurement and sensor conditioning (such as temperature or bridge applications).

A single external resistor sets any gain from 1 to 1000. The INA188 is designed to use an industry-standard gain equation: G = 1 + (50 kΩ / RG). The reference pin can be used for level-shifting in single-supply operation or for an offset calibration.

The INA188 is specified over the temperature range of –40°C to +125°C .

Device Information

ORDER NUMBERPACKAGEBODY SIZE
INA188SOIC (8)4.90 mm × 3.91 mm
INA188WSON (8)(2)4.00 mm × 4.00 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.
  2. The DRJ package (WSON-8) is a preview device.

Simplified Schematic

INA188 block_diagram_simplified_sbos632.gif