JAJSOF5 May   2024 INA4235

PRODUCTION DATA  

  1.   1
  2. 1 特長
  3. 2 アプリケーション
  4. 3 概要
  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 Timing Requirements (I2C)
    7. 5.7 Timing Diagram
    8. 5.8 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 Analog-to-Digital Converter (ADC)
      2. 6.3.2 Internal Measurement and Calculation Engine
      3. 6.3.3 Low Bias Current
      4. 6.3.4 Low Voltage Supply and Wide Common-Mode Voltage Range
      5. 6.3.5 ALERT Pin
    4. 6.4 Device Functional Modes
      1. 6.4.1 Continuous Versus Triggered Operation
      2. 6.4.2 Device Low Power Modes
      3. 6.4.3 Power-On Reset
      4. 6.4.4 Averaging and Conversion Time Considerations
    5. 6.5 Programming
      1. 6.5.1 I2C Serial Interface
      2. 6.5.2 Writing to and Reading Through the I2C Serial Interface
      3. 6.5.3 High-Speed I2C Mode
      4. 6.5.4 General Call Reset
      5. 6.5.5 SMBus Alert Response
  8. 7 Register Maps
    1. 7.1 Device Registers
  9. 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 Registers
        4. 8.2.2.4 Set Desired Fault Thresholds
        5. 8.2.2.5 Calculate Returned Values
      3. 8.2.3 Application Curves
  10. 9 Power Supply Recommendations
  11. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  12. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Development Support
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 ドキュメントの更新通知を受け取る方法
    4. 11.4 サポート・リソース
    5. 11.5 Trademarks
    6. 11.6 静電気放電に関する注意事項
    7. 11.7 用語集
  13. 12Revision History
  14. 13Mechanical, Packaging, and Orderable Information

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

8.1.3 ADC Output Data Rate and Noise Performance

The INA4235 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 140µs. 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 verifies that full noise distribution is taken into consideration.

Table 8-2 INA4235 Noise performance, current measurement, single channel enabled
ADC CONVERSION TIME PERIOD [µs] OUTPUT SAMPLE AVERAGING [SAMPLES] OUTPUT SAMPLE PERIOD [ms] NOISE-FREE ENOB (±81.92mV) (ADCRANGE = 0) NOISE-FREE ENOB (±20.48mV) (ADCRANGE = 1)
140 1 0.14 13.1 11.1
204 1 0.204 13.4 11.1
332 1 0.332 14.1 11.7
588 1 0.588 14.7 12.2
1100 1 1.1 14.7 12.5
2116 1 2.116 15.1 13.4
4156 1 4.156 15.7 14.1
8244 1 8.244 16.0 14.7
140 4 0.56 14.1 12.1
204 4 0.816 14.4 12.4
332 4 1.328 15.1 12.9
588 4 2.352 15.7 13.4
1100 4 4.4 15.7 13.7
2116 4 8.464 16.0 14.7
4156 4 16.624 16.0 14.7
8244 4 32.976 16.0 15.7
140 16 2.24 15.1 13.1
204 16 3.264 15.7 13.4
332 16 5.312 15.7 14.1
588 16 9.408 16.0 14.4
1100 16 17.6 16.0 15.1
2116 16 33.856 16.0 15.7
4156 16 66.496 16.0 15.7
8244 16 131.904 16.0 16.0
140 64 8.96 15.7 13.7
204 64 13.056 16.0 14.4
332 64 21.248 16.0 15.1
588 64 37.632 16.0 15.7
1100 64 70.4 16.0 15.7
2116 64 135.424 16.0 16.0
4156 64 265.984 16.0 16.0
8244 64 527.616 16.0 16.0
140 128 17.92 16.0 14.1
204 128 26.112 16.0 15.1
332 128 42.496 16.0 15.7
588 128 75.264 16.0 15.7
1100 128 140.8 16.0 16.0
2116 128 270.848 16.0 16.0
4156 128 531.968 16.0 16.0
8244 128 1055.232 16.0 16.0
140 256 35.84 16.0 14.7
204 256 52.224 16.0 15.7
332 256 84.992 16.0 15.7
588 256 150.528 16.0 16.0
1100 256 281.6 16.0 16.0
2116 256 541.696 16.0 16.0
4156 256 1063.936 16.0 16.0
8244 256 2110.464 16.0 16.0
140 512 71.68 16.0 15.1
204 512 104.448 16.0 15.7
332 512 169.984 16.0 16.0
588 512 301.056 16.0 16.0
1100 512 563.2 16.0 16.0
2116 512 1083.392 16.0 16.0
4156 512 2127.872 16.0 16.0
8244 512 4220.928 16.0 16.0
140 1024 143.36 16.0 15.7
204 1024 208.896 16.0 16.0
332 1024 339.968 16.0 16.0
588 1024 602.112 16.0 16.0
1100 1024 1126.4 16.0 16.0
2116 1024 2166.784 16.0 16.0
4156 1024 4255.744 16.0 16.0
8244 1024 8441.856 16.0 16.0