AD8628 Zero-Drift, Single-Supply, RRIO Op Amp

This amplifier has ultralow offset, drift, and bias current. The AD8628/AD8629/AD8630 are wide bandwidth auto-zero amplifiers featuring rail-to-rail input and output swing and low noise. Operation is fully specified from 2.7 V to 5 V single supply (±1.35 V to ±2.5 V dual supply).

The AD8628/AD8629/AD8630 provide benefits previously found only in expensive auto-zeroing or chopper-stabilized amplifiers. Using Analog Devices, Inc., topology, these zero-drift amplifiers combine low cost with high accuracy and low noise. No external capacitor is required. In addition, the AD8628/ AD8629/AD8630 greatly reduce the digital switching noise found in most chopper-stabilized amplifiers.

With an offset voltage of only 1 μV, drift of less than 0.005 μV/°C, and noise of only 0.5 μV p-p (0 Hz to 10 Hz), the AD8628/ AD8629/AD8630 are suited for applications where error sources cannot be tolerated. Position and pressure sensors, medical equipment, and strain gage amplifiers benefit greatly from nearly zero drift over their operating temperature range. Many systems can take advantage of the rail-to-rail input and output swings provided by the AD8628/AD8629/AD8630 to reduce input biasing complexity and maximize SNR.

The AD8628/AD8629/AD8630 are specified for the extended industrial temperature range (−40°C to +125°C). The AD8628 is available in tiny 5-lead TSOT, 5-lead SOT-23, and 8-lead narrow SOIC plastic packages. The AD8629 is available in the standard 8-lead narrow SOIC and MSOP plastic packages. The AD8630 quad amplifier is available in 14-lead narrow SOIC and 14-lead TSSOP plastic packages. See the Ordering Guide for automotive grades.

Applications
  • Automotive sensors
  • Pressure and position sensors
  • Strain gage amplifiers
  • Medical instrumentation
  • Thermocouple amplifiers
  • Precision current sensing
  • Photodiode amplifiers
Features and Benefits
  • Lowest auto-zero amplifier noise
  • Low offset voltage: 1 μV
  • Input offset drift: 0.002 μV/°C
  • Rail-to-rail input and output swing
  • 5 V single-supply operation
  • High gain, CMRR, and PSRR: 130 dB
  • Very low input bias current: 100 pA maximum
  • Low supply current: 1.0 mA
  • Overload recovery time: 50 μs
  • No external components required
  • Qualified for automotive applications
    • Amplifiers
    SPICE Models
    Reference Designs
    Data Sheets
    Documentnote
    AD8628/AD8629/AD8630: Zero-Drift, Single-Supply, Rail-to-Rail Input/Output Operational Amplifier Data Sheet (Rev. K)PDF 414 kB
    Application Notes
    Documentnote
    AN-106: A Collection of Amp ApplicationsPDF 1094 kB
    AN-940: Low Noise Amplifier Selection Guide for Optimal Noise Performance (Rev. D)PDF 199 kB
    AN-1114: Lowest Noise Zero-Drift Amplifier Has 5.6 nV/√Hz Voltage Noise Density (Rev. B)PDF 182 kB
    AN-649: Using the Analog Devices Active Filter Design Tool (Rev. 0)PDF 5.3 M
    Technical Books
    Documentnote
    Order Information
    Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
    AD8628ARTZ-R2 Production5 ld SOT-23REEL 250-40 to 125C1.541.54Y
    AD8628ARTZ-REEL7 Production5 ld SOT-23REEL 3000-40 to 125C00.96Y
    AD8628ARZ Production8 ld SOICOTH 98-40 to 125C1.110.96Y
    AD8628ARZ-REEL Production8 ld SOICREEL 2500-40 to 125C00.96Y
    AD8628ARZ-REEL7 Production8 ld SOICREEL 1000-40 to 125C00.96Y
    AD8628AUJZ-R2 Production5 ld TSOTREEL 250-40 to 125C1.691.69Y
    AD8628AUJZ-REEL Production5 ld TSOTREEL 10000-40 to 125C00.96Y
    AD8628AUJZ-REEL7 Production5 ld TSOTREEL 3000-40 to 125C00.96Y
    AD8628WARTZ-R7 Production5 ld SOT-23REEL 3000-40 to 125C01.2Y
    AD8628WARTZ-RL Production5 ld SOT-23REEL 10000-40 to 125C01.2Y
    AD8628WARZ-R7 Production8 ld SOICREEL 1000-40 to 125C01.2Y
    AD8628WARZ-RL Last Time Buy8 ld SOICREEL 2500-40 to 125C01.2Y
    AD8628WAUJZ-R7 Production5 ld TSOTREEL 3000-40 to 125C01.2Y
    AD8628WAUJZ-RL Production5 ld TSOTREEL 10000-40 to 125C01.2Y
    Evaluation Boards
    Part NumberDescriptionPriceRoHS
    EVAL-PRAOPAMP-1KSZSingle KS-5 lead SC70 Evaluation Board20.19Y
    EVAL-PRAOPAMP-1RJZSingle RJ-5 lead SOT23 Evaluation Board20.19Y
    EVAL-PRAOPAMP-1RMZSingle RM-8 lead MSOP Evaluation Board20.19Y
    EVAL-PRAOPAMP-1RZSingle R-8 lead SOIC Evaluation Board20.19Y
    Reference Materials
    AD8628/AD8629/AD8630: Zero-Drift, Single-Supply, Rail-to-Rail Input/Output Operational Amplifier Data Sheet (Rev. K) ad8628
    AD8628/AD8629/AD8630：零漂移、单电源、轨到轨输入/输出运算放大器数据手册 (Rev. H) ad8628
    AD8628 SPICE Macro-Model ad8628
    CN0281 设计和集成文件 adt7311
    AN-106: A Collection of Amp Applications ad8532
    AN-940: Low Noise Amplifier Selection Guide for Optimal Noise Performance (Rev. D) ad8628
    AN-940: 低噪声放大器选择指南 (Rev. A) ad8628
    AN-1114: 最低噪声的零漂移放大器提供5.6 nV/√Hz电压噪声密度 (Rev. B) ad8628
    AN-1114: Lowest Noise Zero-Drift Amplifier Has 5.6 nV/√Hz Voltage Noise Density (Rev. B) ad8628
    AN-649: Using the Analog Devices Active Filter Design Tool (Rev. 0) ad8350
    MT-055: 斩波稳定(自稳零)精密运算放大器 ad8628
    MT-052：运算放大器噪声指数：不要被误导 ad829
    MT-050: 二阶系统的运算放大器总输出噪声计算 ad9631
    MT-049：单极点系统的运算放大器总输出噪声计算 ad829
    MT-048：运算放大器噪声关系：1/f噪声、均方根(RMS)噪声与等效噪声带宽 ad829
    MT-047：运算放大器噪声 ad829
    Demystifying Auto-Zero Amplifiers Part 1 ad8551
    CN-0023: Precision, Unipolar, Noninverting Configuration for the... adr03
    CN0281：利用ADuC7060/ADuC7061精密模拟微控制器构建基于汽车SENT接口且带冷结补偿的热电偶温度传感器 adt7311
    CN-0079: High Precision Digital-to-Analog Conversion Using the 16-Bit... adr421
    CN-0061: DC-Coupled, Single-Ended-to-Differential Conversion Using the... ad7357
    CN-0027: Precision, Unipolar, Noninverting Configuration for the... adr03
    CN-0026: Precision, Unipolar, Inverting Conversion Using the AD5547/AD5557 DAC adr03
    CN-0022: Precision, Unipolar, Inverting Conversion Using the AD5546/AD5556 DAC adr03
    MS-2062：斩波还是自稳零：是个问题 ad8551
    MS-2066：传感器电路的低噪声信号调理 ad8628
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