SBOS393F March   2007  – June 2021 INA203 , INA204 , INA205

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: Current-Shunt Monitor
    6. 6.6 Electrical Characteristics: Comparator
    7. 6.7 Electrical Characteristics: Reference
    8. 6.8 Electrical Characteristics: General
    9. 6.9 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagrams
    3. 7.3 Feature Description
      1. 7.3.1 Basic Connections
      2. 7.3.2 Selecting RSHUNT
      3. 7.3.3 Comparator
      4. 7.3.4 Comparator Delay (14-Pin Version Only)
      5. 7.3.5 Comparator Maximum Input Voltage Range
    4. 7.4 Device Functional Modes
      1. 7.4.1 Input Filtering
      2. 7.4.2 Accuracy Variations as a Result Of VSENSE and Common-Mode Voltage
        1. 7.4.2.1 Normal Case 1: VSENSE ≥ 20 mV, VCM ≥ VS
        2. 7.4.2.2 Normal Case 2: VSENSE ≥ 20 mV, VCM < VS
        3. 7.4.2.3 Low VSENSE Case 1
        4. 7.4.2.4 Low VSENSE Case 2: VSENSE < 20 mV, 0 V ≤ VCM ≤ VS
      3. 7.4.3 Transient Protection
      4. 7.4.4 Output Voltage Range
      5. 7.4.5 Reference
  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 Curves
  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 Related Links
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Support Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • D|14
  • DGS|10
  • PW|14
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.4.1 Input Filtering

An obvious and straightforward location for filtering is at the output of the INA203, INA204, and INA205 series; however, this location negates the advantage of the low output impedance of the internal buffer. The only other option for filtering is at the input pins of the INA203, INA204, and INA205, which is complicated by the internal 5 kΩ + 30% input impedance; this configuration is illustrated in Figure 7-10. Using the lowest possible resistor values minimizes both the initial shift in gain and effects of tolerance. Use Equation 2 to calculate the effect on initial gain.

Equation 2. GUID-6ED880EF-0FBA-4989-9C17-D0262B72F1BA-low.gif

Total effect on gain error can be calculated by replacing the 5-kΩ term with 5 kΩ – 30%, (or 3.5 kΩ) or 5 kΩ + 30% (or 6.5 kΩ). The tolerance extremes of RFILT can also be inserted into the equation. If a pair of 100 Ω 1% resistors are used on the inputs, the initial gain error will be 1.96%. Worst-case tolerance conditions will always occur at the lower excursion of the internal 5-kΩ resistor (3.5 kΩ), and the higher excursion of RFILT – 3% in this case.

GUID-2AC569F5-3994-4F93-BBC9-0CC180A1C591-low.gifFigure 7-10 Input Filter (Gain Error: 1.5% to –2.2%)

The specified accuracy of the INA203, INA204, and INA205 must then be combined in addition to these tolerances. While this discussion treated accuracy worst-case conditions by combining the extremes of the resistor values, it is appropriate to use geometric mean or root sum square calculations to total the effects of accuracy variations.