AD8418 Bidirectional, Zero-Drift, Current Sense Amplifier

Applications High-side current sensing in Motor controls Solenoid controls Power management Low-side current sensing Diagnostic protection

The AD8418 is a high voltage, high resolution current shunt amplifier. It features an initial gain of 20 V/V, with a maximum ±0.15% gain error over the entire temperature range. The buffered output voltage directly interfaces with any typical converter. The AD8418 offers excellent input common-mode rejection from −2 V to +70 V. The AD8418 performs bidirectional current measurements across a shunt resistor in a variety of automotive and industrial applications, including motor control, battery management, and solenoid control.

The AD8418 offers breakthrough performance throughout the −40°C to +125°C temperature range. It features a zero drift core, which leads to a typical offset drift of 0.1 μV/°C throughout the operating temperature range and the common-mode voltage range. The AD8418 is fully qualified for automotive applications and includes EMI filters and patented circuitry to enable output accuracy with pulse-width modulation (PWM) type input common-mode voltages. The typical input offset voltage is ±200 μV. The AD8418 is offered in 8-lead MSOP and SOIC packages.

Applications
  • High-side current sensing in Motor controls Solenoid controls Power management
  • Low-side current sensing
  • Diagnostic protection
Features and Benefits
  • Typical 0.1 μV/°C offset drift
  • Maximum ±400 μV voltage offset over full temperature range
  • 2.7 V to 5.5 V power supply operating range
  • Electromagnetic interference (EMI) filters Included
  • High common-mode input voltage range
    −2 V to +70 V operating
    −4 V to +85 V survival
  • Initial gain = 20 V/V
  • Wide operating temperature range:
    −40°C to +125°C
  • Bidirectional operation
  • Available in 8-lead SOIC and 8-lead MSOP
  • Common-mode rejection ratio (CMRR): 86 dB, dc to 10 kHz
  • Qualified for automotive applications
    • Amplifiers
    SPICE Models
    Data Sheets
    Documentnote
    AD8418: Bidirectional, Zero Drift, Current Sense Amplifier Data Sheet (Rev. 0)PDF 293 kB
    Application Notes
    Documentnote
    AN-1321: Common-Mode Transients in Current Sense Applications (Rev. 0)PDF 119.03 K
    AN-1318: Differential Overvoltage Protection Circuits for Current Sense Amplifiers (Rev. 0)PDF 171.45 K
    AN-1308: Common-Mode Step Response of Current Sense Amplifiers (Rev. A)PDF 176 kB
    User Guides
    Documentnote
    AD8418: Evaluation Board for the Current Sense AmplifierWIKI
    Order Information
    Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
    AD8418BRMZ Production8 ld MSOPOTH 50-40 to 125C0.920.89Y
    AD8418BRMZ-RL Production8 ld MSOPREEL 3000-40 to 125C00.89Y
    AD8418WBRMZ Production8 ld MSOPOTH 50-40 to 125C1.071.03Y
    AD8418WBRMZ-RL Production8 ld MSOPREEL 3000-40 to 125C01.03Y
    AD8418WBRZ Production8 ld SOICOTH 98-40 to 125C1.071.03Y
    AD8418WBRZ-RL Production8 ld SOICREEL 2500-40 to 125C01.03Y
    Evaluation Boards
    Part NumberDescriptionPriceRoHS
    AD8418-EVALZEval Board for 8 Lead MSOP83.4Y
    AD8418R-EVALZEval Board for 8-LEAD MSOP83.4Y
    Reference Materials
    AD8418：双向、零漂移、电流检测放大器 (Rev. 0) ad8418
    AD8418: Bidirectional, Zero Drift, Current Sense Amplifier Data Sheet (Rev. 0) ad8418
    AD8418 SPICE Macro Model ad8418
    AN-1321：电流检测应用中的共模瞬态 (Rev. 0) adum3223
    AN-1321: Common-Mode Transients in Current Sense Applications (Rev. 0) adum3223
    AN-1318: Differential Overvoltage Protection Circuits for Current Sense Amplifiers (Rev. 0) ad8210
    AN-1318：用于电流检测放大器的差分电压保护电路 (Rev. 0) ad8210
    AN-1308: Common-Mode Step Response of Current Sense Amplifiers (Rev. A) ad8479
    AN-1308: 电流检测放大器共模阶跃响应 (Rev. 0) ad8479
    电流检测放大器的差分过压保护电路 ad8210
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