SBOSAA6B May   2024  – July 2025 INA790A , INA790B

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Integrated Shunt Resistor
      2. 6.3.2 Safe Operating Area
      3. 6.3.3 Short-Circuit Duration
      4. 6.3.4 Temperature Drift Correction
      5. 6.3.5 Enhanced PWM Rejection Operation
    4. 6.4 Device Functional Modes
      1. 6.4.1 Adjusting the Output With the Reference Pin
        1. 6.4.1.1 Reference Pin Connections for Unidirectional Current Measurements
        2. 6.4.1.2 Ground Referenced Output
        3. 6.4.1.3 Reference Pin Connections for Bidirectional Current Measurements
        4. 6.4.1.4 Output Set to Mid-Supply Voltage
      2. 6.4.2 Adjustable Gain Set Using External Resistors
        1. 6.4.2.1 Adjustable Unity Gain
      3. 6.4.3 Thermal Alert Function
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Calculating Total Error
        1. 7.1.1.1 Error Sources
        2. 7.1.1.2 Reference Voltage Rejection Ratio Error
        3. 7.1.1.3 External Adjustable Gain Error
        4. 7.1.1.4 Total Error Example 1
        5. 7.1.1.5 Total Error Example 2
        6. 7.1.1.6 Total Error Example 3
        7. 7.1.1.7 Total Error Curves
      2. 7.1.2 Signal Filtering
    2. 7.2 Typical Applications
      1. 7.2.1 High-Side, High-Drive, Solenoid Current-Sense Application
        1. 7.2.1.1 Design Requirements
        2. 7.2.1.2 Detailed Design Procedure
        3. 7.2.1.3 Application Curve
      2. 7.2.2 Speaker Enhancements and Diagnostics Using Current Sense Amplifier
        1. 7.2.2.1 Design Requirements
        2. 7.2.2.2 Detailed Design Procedure
        3. 7.2.2.3 Application Curve
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Documentation Support
      1. 8.1.1 Related Documentation
    2. 8.2 Receiving Notification of Documentation Updates
    3. 8.3 Support Resources
    4. 8.4 Trademarks
    5. 8.5 Electrostatic Discharge Caution
    6. 8.6 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

7.1.1.5 Total Error Example 2

Table 7-2 Total Error Calculation: Example 2(1)
TERMSYMBOLEQUATIONMAX VALUE
Input offset over Temp IOS_T I O S 70mA
Added input offset because of common-mode voltage IOS_CM C M R R × | ( V C M – 48 V   ) | 2.8mA
Added input offset because of reference voltage IOS_REF R V R R × | ( V S 2 – V R E F   ) | 31.25mA
Total input offset Current IOS_Total ( I O S _ T ) 2 + ( I O S _ C M ) 2 + ( I O S _ R E F ) 2 76.7mA
Error from input offset ErrorIOS I O S _ T o t a l I S e n s e × 100 0.306%
Gain error with Gain drift ErrorG G E r r o r + G E r r o r _ d r i f t × ∆   T 0.7%
Error due to Gain Nonlinearity ErrorLin G L i n _ E r r o r × I 2 × 100 % 0.0937%
Total error — ( E r r o r I O S ) 2 + E r r o r G + E r r o r L i n 2 0.85%
(1) The data for Total Error Example 2 is taken with the INA790x, VS = 5V, VCM = 12V, VREF = 0V, T = 125°C, External Unity Gain ( G = 20mV/A) and ISENSE = 25A.