SBOS844C May   2021  – March 2023 INA234

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
    6. 6.6 Timing Requirements (I2C)
    7. 6.7 Timing Diagram
    8. 6.8 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Integrated Analog-to-Digital Convertor (ADC)
      2. 7.3.2 Power Calculation
      3. 7.3.3 Low Bias Current
      4. 7.3.4 Low Voltage Supply and Wide Common-Mode Voltage Range
      5. 7.3.5 ALERT Pin
    4. 7.4 Device Functional Modes
      1. 7.4.1 Continuous Verses Triggered Operation
      2. 7.4.2 Device Shutdown
      3. 7.4.3 Power-On Reset
      4. 7.4.4 Averaging and Conversion Time Considerations
    5. 7.5 Programming
      1. 7.5.1 I2C Serial Interface
      2. 7.5.2 Writing to and Reading Through the I2C Serial Interface
      3. 7.5.3 High-Speed I2C Mode
      4. 7.5.4 General Call Reset
      5. 7.5.5 General Call Start Byte
      6. 7.5.6 SMBus Alert Response
    6. 7.6 Register Maps
      1. 7.6.1 Device Registers
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Device Measurement Range and Resolution
      2. 8.1.2 Current and Power Calculations
      3. 8.1.3 ADC Output Data Rate and Noise Performance
      4. 8.1.4 Filtering and Input Considerations
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Select the Shunt Resistor
        2. 8.2.2.2 Configure the Device
        3. 8.2.2.3 Program the Shunt Calibration Register
        4. 8.2.2.4 Set Desired Fault Thresholds
        5. 8.2.2.5 Calculate Returned Values
      3. 8.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  9. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Development Support
    2. 9.2 Documentation Support
      1. 9.2.1 Related Documentation
    3. 9.3 Receiving Notification of Documentation Updates
    4. 9.4 Support Resources
    5. 9.5 Trademarks
    6. 9.6 Electrostatic Discharge Caution
    7. 9.7 Glossary
  10. 10Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • YBJ|8
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.1.3 ADC Output Data Rate and Noise Performance

The INA234 noise performance and effective resolution depend on the ADC conversion time. The device also supports digital averaging which can further help decrease digital noise. The flexibility of the device to select ADC conversion time and data averaging offers increased signal-to-noise ratio and achieves the highest dynamic range with lowest offset. The profile of the noise at lower signals levels is dominated by the system noise that is comprised mainly of 1/f noise or white noise. The effective resolution of the ADC can be increased by increasing the conversion time and increasing the number of averages.

Table 8-2 summarizes the output data rate conversion settings supported by the device. The fastest conversion setting is 140 µs. Typical noise-free resolution is represented as Effective Number of Bits (ENOB) based on device measured data. The ENOB is calculated based on noise peak-to-peak values, which assures that full noise distribution is taken into consideration.

Table 8-2 INA234 Noise Performance
ADC CONVERSION TIME PERIOD [µs] OUTPUT SAMPLE AVERAGING [SAMPLES] OUTPUT SAMPLE PERIOD [ms] NOISE-FREE ENOB (±81.92-mV) (ADCRANGE = 0) NOISE-FREE ENOB (±20.48-mV) (ADCRANGE = 1)
140 1 0.14 12.0 10.7
204 1 0.204 12.0 11.1
332 1 0.332 12.0 11.1
588 1 0.588 12.0 11.7
1100 1 1.1 12.0 12.0
2116 1 2.116 12.0 12.0
4156 1 4.156 12.0 12.0
8244 1 8.244 12.0 12.0
140 4 0.56 12.0 12.0
204 4 0.816 12.0 12.0
332 4 1.328 12.0 12.0
588 4 2.352 12.0 12.0
1100 4 4.4 12.0 12.0
2116 4 8.464 12.0 12.0
4156 4 16.624 12.0 12.0
8244 4 32.976 12.0 12.0
140 16 2.24 12.0 12.0
204 16 3.264 12.0 12.0
332 16 5.312 12.0 12.0
588 16 9.408 12.0 12.0
1100 16 17.6 12.0 12.0
2116 16 33.856 12.0 12.0
4156 16 66.496 12.0 12.0
8244 16 131.904 12.0 12.0
140 64 8.96 12.0 12.0
204 64 13.056 12.0 12.0
332 64 21.248 12.0 12.0
588 64 37.632 12.0 12.0
1100 64 70.4 12.0 12.0
2116 64 135.424 12.0 12.0
4156 64 265.984 12.0 12.0
8244 64 527.616 12.0 12.0
140 128 17.92 12.0 12.0
204 128 26.112 12.0 12.0
332 128 42.496 12.0 12.0
588 128 75.264 12.0 12.0
1100 128 140.8 12.0 12.0
2116 128 270.848 12.0 12.0
4156 128 531.968 12.0 12.0
8244 128 1055.232 12.0 12.0
140 256 35.84 12.0 12.0
204 256 52.224 12.0 12.0
332 256 84.992 12.0 12.0
588 256 150.528 12.0 12.0
1100 256 281.6 12.0 12.0
2116 256 541.696 12.0 12.0
4156 256 1063.936 12.0 12.0
8244 256 2110.464 12.0 12.0
140 512 71.68 12.0 12.0
204 512 104.448 12.0 12.0
332 512 169.984 12.0 12.0
588 512 301.056 12.0 12.0
1100 512 563.2 12.0 12.0
2116 512 1083.392 12.0 12.0
4156 512 2127.872 12.0 12.0
8244 512 4220.928 12.0 12.0
140 1024 143.36 12.0 12.0
204 1024 208.896 12.0 12.0
332 1024 339.968 12.0 12.0
588 1024 602.112 12.0 12.0
1100 1024 1126.4 12.0 12.0
2116 1024 2166.784 12.0 12.0
4156 1024 4255.744 12.0 12.0
8244 1024 8441.856 12.0 12.0