OP491 Micropower Single-Supply RRIO Quad Op Amp

The OP191, OP291 and OP491 are single, dual and quad micropower, single-supply, 3 MHz bandwidth amplifiers featuring rail-to-rail inputs and outputs. All are guaranteed to operate from a 3 volt single supply as well as ±5 volt dual supplies.

Fabricated on Analog Devices' CBCMOS process, the OP191 family has a unique input stage that allows the input voltage to safely extend 10 volts beyond either supply without any phase inversion or latch-up. The output voltage swings to within millivolts of the supplies and continues to sink or source current all the way to the supplies.

Applications for these amplifiers include portable telecom equipment, power supply control and protection, and interface for transducers with wide output ranges. Sensors requiring a rail-to-rail input amplifier include Hall effect, piezo electric, and resistive transducers.

The ability to swing rail-to-rail at both the input and output enables designers to build multistage filters in single-supply systems and maintain high signal-to-noise ratios.

The OP191/OP291/OP491 are specified over the extended industrial (-40°C to +125°C) temperature range. The OP191 single and OP291 dual amplifiers are available in 8-pin plastic DIPs and SO surface mount packages. The OP491 quad is available in 14-pin DIPs and narrow 14-pin SO packages. Consult factory for OP491 TSSOP availability.

Features and Benefits
  • Single Supply Operation: 2.7 V to 12 V
  • Wide Input Voltage Range
  • Rail-to-Rail Output Swing
  • Low Supply Current: 300 µA/Amp
  • Wide Bandwidth: 3 MHz
  • Slew Rate: 0.5 Vµs
  • Low Offset Voltage: 700 µ V
  • No Phase Reversal
    • Amplifiers
    OP491 SPICE Macro-Model
    Data Sheets
    Documentnote
    OP191/OP291/OP491: Micropower Single-Supply Rail-to-Rail Input/Output Op Amps Data Sheet (Rev. E)PDF 599 kB
    Application Notes
    Documentnote
    AN-357: Operational IntegratorsPDF 272 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
    OP491GPZ Production14 ld PDIPOTH 25-40 to 125C4.694.2Y
    OP491GRUZ-REEL Production14 ld TSSOPREEL 2500-40 to 125C04.2Y
    OP491GS-REEL7 Production14 ld SOICREEL 1000-40 to 125C04.85N
    OP491GSZ Production14 ld SOICOTH 56-40 to 125C4.694.2Y
    OP491GSZ-REEL Production14 ld SOICREEL 2500-40 to 125C04.2Y
    OP491GSZ-REEL7 Production14 ld SOICREEL 1000-40 to 125C04.2Y
    Evaluation Boards
    Part NumberDescriptionPriceRoHS
    EVAL-PRAOPAMP-4RUZQUAD 14-Lead TSSOP Evaluation Board20.19Y
    EVAL-PRAOPAMP-4RZQUAD R-14 lead SOIC Evaluation Board20.19Y
    OP191/OP291/OP491: Micropower Single-Supply Rail-to-Rail Input/Output Op Amps Data Sheet (Rev. E) op291
    OP491 SPICE Macro-Model Rev. A, 5/94 op491
    OP491G SPICE Macro-Model Rev. A, 5/94 op491
    AN-357: Operational Integrators ad8350
    AN-649: Using the Analog Devices Active Filter Design Tool (Rev. 0) ad8350
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