OP297 Low Bias Current Precision (Dual) Operational Amplifier

The OP297 is the first dual op amp to pack precision performance into the space-saving, industry standard 8-pin SO package. Its combination of precision with low power and extremely low input bias current makes the dual OP297 useful in a wide variety of applications.

Precision performance of the OP297 includes very low offset, under 50µV, and low drift, below 0.6µV/°C. Open-loop gain exceeds 2000V/mV insuring high linearity in every application. Errors due to common-mode signals are eliminated by the OP297's common-mode rejection of over 120 dB. The OP297's power supply rejection of over 120dB minimizes offset voltage changes experienced in battery powered systems. Supply current of the OP297 is under 625µA per amplifier and it can operate with supply voltages as low a ±2V.

The OP297 utilizes a super-beta input stage with bias current cancellation to maintain picoamp bias currents at all temperatures. This is in contrast to FET input op amps whose bias currents start in the picoamp range of 25°C, but double for every 10°C rise in temperature, to reach the nanoamp range above 85°C. Input bias current of the OP297 is under 100pA at 25°C and is under 450pA over the military temperature range.

Combining precision, low power and low bias current, the OP297 is ideal for a number of applications including instrumentation amplifiers, log amplifiers, phot-diode preamplifiers and long-term integrators. For a single device, see the OP97; for a quad, see the OP497.

Features and Benefits
  • Low Offset Voltage: 50 µV Max
  • Low Offset Voltage Drift: 0.6 µV/°C Max
  • Very Low Bias Current: 100 pA Max
  • Very High Open-Loop Gain: 2000 V/mV Min
  • Low Supply Current (Per Amplifier):
    625 µA Max
  • Operates From ±2 V to ±20 V Supplies
  • High Common-Mode Rejection:
    120 dB Min
  • Pin Compatible to LT1013, AD706,
    AD708, OP221, LM158, and
    MC1458/ 1558 with Improved
    Performance
  • Amplifiers
    OP297 SPICE Macro-Model
    Data Sheets
    Documentnote
    OP297: Dual Low Bias Current Precision Operational Amplifier Data Sheet (Rev. G)PDF 317 kB
    Application Notes
    Documentnote
    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
    OP297EZ Production8 ld CerDIPOTH 48-40 to 85C9.69.12N
    OP297FPZ Production8 ld PDIPOTH 50-40 to 85C4.194Y
    OP297FS Production8 ld SOICOTH 98-40 to 85C4.183.98N
    OP297FS-REEL7 Production8 ld SOICREEL 1000-40 to 85C03.98N
    OP297FSZ Production8 ld SOICOTH 98-40 to 85C3.693.5Y
    OP297FSZ-REEL Production8 ld SOICREEL 2500-40 to 85C03.5Y
    OP297FSZ-REEL7 Production8 ld SOICREEL 1000-40 to 85C03.5Y
    OP297GPZ Production8 ld PDIPOTH 50-40 to 85C3.143.03Y
    OP297GS Production8 ld SOICOTH 98-40 to 85C3.22.96N
    OP297GS-REEL Production8 ld SOICREEL 2500-40 to 85C02.96N
    OP297GS-REEL7 Production8 ld SOICREEL 1000-40 to 85C02.96N
    OP297GSZ Production8 ld SOICOTH 98-40 to 85C2.822.61Y
    OP297GSZ-REEL Production8 ld SOICREEL 2500-40 to 85C02.61Y
    OP297GSZ-REEL7 Production8 ld SOICREEL 1000-40 to 85C02.61Y
    Evaluation Boards
    Part NumberDescriptionPriceRoHS
    EVAL-PRAOPAMP-2CPZDual CP-8 lead LFCSP Evaluation Board20.19Y
    EVAL-PRAOPAMP-2RMZDual RM-8 lead MSOP Evaluation Board20.19Y
    EVAL-PRAOPAMP-2RZDual R-8 lead SOIC Evaluation Board20.19Y
    OP297: Dual Low Bias Current Precision Operational Amplifier Data Sheet (Rev. G) op297
    OP297 SPICE Macro-Model Rev. C, 10/91 op297
    OP297A SPICE Macro-Model Rev. C, 10/91 op297
    OP297E SPICE Macro-Model Rev. C, 10/91 op297
    OP297F SPICE Macro-Model Rev. C, 10/91 op297
    OP297G SPICE Macro-Model Rev. C, 10/91 op297
    AN-649: Using the Analog Devices Active Filter Design Tool (Rev. 0) ad8350