SBOS946 September   2020 INA848

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Topology
      2. 8.3.2 Input Common-Mode Range
      3. 8.3.3 Input Protection
    4. 8.4 Device Functional Modes
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Filter Pin
        1. 9.1.1.1 RC Filter Network
        2. 9.1.1.2 RLC Filter Network
      2. 9.1.2 Input Bias Current Return Path
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Reference Pin
        2. 9.2.2.2 Noise Analysis
          1. 9.2.2.2.1 Reference Voltage Noise Contribution
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Support Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

3 Description

The INA848 is a fixed-gain instrumentation amplifier optimized for high-precision measurements, such as very-small, fast, differential input signals. TI's super-beta topology provides a very low input bias current and current noise. The well-matched transistors help achieve a very low offset and offset drift. Matching of the internal resistors yields a high common-mode rejection ratio of 132 dB across the full input-voltage range, and a very low gain drift error of 5 ppm/⁰C (max).

The current-feedback topology of the INA848 produces a wide bandwidth of 2.8 MHz at a fixed gain of 2000, thereby eliminating the need for subsequent gain stages. The very-low noise floor of 1.3 nV/√Hz minimizes the impact on the equivalent number of bits (ENOB) when interfacing with high-resolution analog-to-digital converters (ADCs). The INA848 provides the flexibility of adding filters between the gain stages (pins 2 and 3) to maintain an adequate signal integrity.

These unique features of the INA848 make this device an excellent choice for applications requiring high-precision measurements, such as high-end medical instrumentation, electroencephalography, vibration sensing, and displacement measurements.

This device is designed for 8-V to 36-V single supplies, or ±4-V to ±18-V on dual supplies.

Device Information
PART NUMBER(1)PACKAGEBODY SIZE (NOM)
INA848SOIC (8)4.90 mm × 3.91 mm
(1) For all available packages, see the package option addendum at the end of the data sheet.
GUID-6C77C25A-5A79-4DC2-ADA0-C00F0DBDE1F9-low.gifINA848 Simplified Internal Schematic
GUID-20200922-CA0I-3GKR-BTS2-HHVCQVQMTHNC-low.svgTypical Distribution of Input Offset Voltage