AD795 Low Power, Low Noise Precision FET Op Amp

The AD795 is a low noise, precision, FET input operational amplifier. It offers both the low voltage noise and low offset drift of a bipolar input op amp and the very low bias current of a FET- input device. The 1014 Ω common-mode impedance insures that input bias current is essentially independent of common- mode voltage and supply voltage variations. APPLICATIONS

The AD795 has both excellent dc performance and a guaranteed and tested maximum input voltage noise. It features 2 pA maximum input bias current and 500 μV maximum offset voltage, along with low supply current of 1.5 mA maximum.

Furthermore, the AD795 features a guaranteed low input noise of 3.3 μV p-p (0.1 Hz to 10 Hz) and a 11 nV/√Hz maximum noise level at 10 kHz. The AD795 has a fully specified and tested input offset voltage drift of only 10 μV/°C maximum.

The AD795 is useful for many high input impedance, low noise applications. The AD795 is rated over the commercial tempera- ture range of 0°C to +70°C. The AD795 is available in an 8-lead SOIC package.

Features and Benefits
  • Low power replacement for Burr-Brown
     OPA111, OPA121 op amps
  • Low noise
     3.3 µV p-p maximum, 0.1 Hz to 10 Hz
     11 nV/√Hz maximum at 10 kHz
     0.6 fA/√Hz at 1 kHz
  • High dc accuracy
     500 µV maximum offset voltage
     10 µV/°C maximum drift
     2 pA maximum input bias current
     Low power: 1.5 mA maximum supply current
    • Amplifiers
    AD795 SPICE Macro-Model
    Data Sheets
    Documentnote
    AD795: Low Power, Low Noise Precision FET Op Amp Data Sheet (Rev. C)PDF 815 kB
    Application Notes
    Documentnote
    AN-253: Find Op Amp Noise with SpreadsheetPDF 77 kB
    AN-356: User's Guide to Applying and Measuring Operational Amplifier SpecificationsPDF 538 kB
    AN-202: An IC Amplifier User’s Guide to Decoupling, Grounding, and Making Things Go Right for a Change (Rev. B)PDF 76.97 K
    AN-256: Accurately Testing Op Amp Settling TimesPDF 106 kB
    AN-358: Noise and Operational Amplifier CircuitsPDF 593 kB
    AN-649: Using the Analog Devices Active Filter Design Tool (Rev. 0)PDF 5.3 M
    Order Information
    Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
    AD795JRZ Production8 ld SOICOTH 980 to 70C4.043.65Y
    AD795JRZ-REEL Production8 ld SOICREEL 25000 to 70C03.65Y
    AD795JRZ-REEL7 Production8 ld SOICREEL 10000 to 70C03.65Y
    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
    AD795: Low Power, Low Noise Precision FET Op Amp Data Sheet (Rev. C) ad795
    AD795 SPICE Macro-Model Rev. A, 11/94 ad795
    AD795J SPICE Macro-Model Rev. A, 11/94 ad795
    AD795K SPICE Macro-Model Rev. A, 11/94 ad795
    AN-253: Find Op Amp Noise with Spreadsheet ad8074
    AN-356: User's Guide to Applying and Measuring Operational Amplifier Specifications ad8350
    AN-202: An IC Amplifier User’s Guide to Decoupling, Grounding, and Making Things Go Right for a Change (Rev. B) ad7715
    AN-256: Accurately Testing Op Amp Settling Times ad8531
    AN-358: Noise and Operational Amplifier Circuits ad8072
    AN-358: 噪声与运算放大器电路 (Rev. 0) ad8072
    AN-356: 用户指南：运算放大器规格参数的应用和测量 (Rev. 0) ad8350
    AN-202: IC放大器用户指南：去耦、接地及其他一些要点 (Rev. 0) ad8021
    AN-649: Using the Analog Devices Active Filter Design Tool (Rev. 0) ad8350
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