SBOS632 September   2015 INA188

UNLESS OTHERWISE NOTED, this document contains PRODUCTION DATA.  

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

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
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 NUMBER PACKAGE BODY SIZE
INA188 SOIC (8) 4.90 mm × 3.91 mm
INA188 WSON (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