SBOSAA6 May   2024 INA790B

ADVANCE INFORMATION  

  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
  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 Stability
      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
    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. 7.2.2 Speaker Enhancements and Diagnostics Using Current Sense Amplifier
        1. 7.2.2.1 Design Requirements
    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

7.1.1.4 Total Error Example 1

Table 7-1 Total Error Calculation: Example 1(1)
TERMSYMBOLEQUATIONTYPICAL VALUE
Initial input offset with Temp driftIOS_T I O S +   d I o s d T × ∆   T 30mA
Added input offset because of common-mode voltageIOS_CM C M R R × | ( V C M – 48   V   ) | 0µA
Added input offset because of reference voltageIOS_REF R V R R × | ( V S 2 – V R E F   ) | 0µA
Total input offset CurrentIOS_Total ( I O S _ T ) 2 + ( I O S _ C M ) 2 + ( I O S _ R E F ) 2 30mA
Error from input offsetErrorIOS I O S _ T o t a l I S e n s e × 100 0.12%
Gain error with Gain driftErrorG G E r r o r + G E r r o r _ d r i f t × ∆   T 0.35%
Nonlinearity errorErrorLin—0.01%
Total error— ( E r r o r I O S ) 2 + ( E r r o r G ) 2 + ( E r r o r L i n ) 2 0.38%
(1) The data for Total Error Example 1 was taken with the INA790x, VS = 5V, VCM = 48V, VREF = VS / 2, T = 25°C, External Unity Gain ( G = 20mV/A) and ISENSE = 25A.