SBOS894A April   2019  – June 2019 INA818

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      INA818 Simplified Internal Schematic
      2.      Typical Distribution of Input Stage Offset Voltage Drift
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
    1.     Pin 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: Table of Graphs
    7. 7.7 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 Setting the Gain
        1. 8.3.1.1 Gain Drift
      2. 8.3.2 EMI Rejection
      3. 8.3.3 Input Common-Mode Range
      4. 8.3.4 Input Protection
      5. 8.3.5 Operating Voltage
      6. 8.3.6 Error Sources
    4. 8.4 Device Functional Modes
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Reference Pin
      2. 9.1.2 Input Bias Current Return Path
    2. 9.2 Typical Applications
      1. 9.2.1 Three-Pin Programmable Logic Controller (PLC)
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
        3. 9.2.1.3 Application Curves
      2. 9.2.2 Resistance Temperature Detector Interface
  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 Community 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

8.3.2 EMI Rejection

Texas Instruments developed a method to accurately measure the immunity of an amplifier over a broad frequency spectrum extending from 10 MHz to 6 GHz. This method uses an EMI rejection ratio (EMIRR) to quantify the ability of the INA818 to reject EMI. The offset resulting from an input EMI signal is calculated using Equation 2:

Equation 2. INA818 ai_eq003_SBOS792.gif

where

  • VRF_PEAK is the peak amplitude of the input EMI signal.

Figure 56 and Figure 57 show the INA818 EMIRR graphs for differential and common-mode EMI rejection across this frequency range. Table 3 lists the EMIRR values for the INA818 at frequencies commonly encountered in real-world applications. Applications listed in Table 3 are centered on or operated near the frequency shown. Depending on the end-system requirements, additional EMI filters may be required near the signal inputs of the system. Incorporating known good practices, such as using short traces, low-pass filters, and damping resistors combined with parallel and shielded signal routing may also be required.

INA818 D048_SBOS959.gif
Figure 56. Common-Mode EMIRR Testing
INA818 D047_SBOS959.gif
Figure 57. Differential Mode EMIRR Testing

Table 3. INA818 EMIRR for Frequencies of Interest

FREQUENCY APPLICATION OR ALLOCATION DIFFERENTIAL EMIRR COMMON-MODE EMIRR
400 MHz Mobile radio, mobile satellite, space operation, weather, radar, ultrahigh-frequency (UHF) applications 52 dB 80 dB
900 MHz Global system for mobile communications (GSM) applications, radio communication, navigation, GPS (up to 1.6 GHz), GSM, aeronautical mobile, UHF applications 55 dB 71 dB
1.8 GHz GSM applications, mobile personal communications, broadband, satellite,
L-band (1 GHz to 2 GHz)		 58 dB 73 dB
2.4 GHz 802.11b, 802.11g, 802.11n, Bluetooth®, mobile personal communications, industrial, scientific and medical (ISM) radio band, amateur radio and satellite, S-band (2 GHz to 4 GHz) 59 dB 95 dB
3.6 GHz Radiolocation, aero communication and navigation, satellite, mobile, S-band 78 dB 96 dB
5 GHz 802.11a, 802.11n, aero communication and navigation, mobile communication, space and satellite operation, C-band (4 GHz to 8 GHz) 70 dB 100 dB