The OP285 is a precision high-speed amplifier featuring theButler Amplifier front-end. This new front-end design combinesthe accuracy and low noise performance of bipolartransistors with the speed of JFETs. This yields an amplifierwith high slew rates, low offset and good noise performanceat low supply currents. Bias currents are also low comparedto bipolar designs.The OP285 offers the slew rate and low power of a JFETamplifier combined with the precision, low noise and lowdrift of a bipolar amplifier. Input offset voltage is laser-trimmedand guaranteed less than 250 μV. This makes the OP285 usefulin dc-coupled or summing applications without the need forspecial selections or the added noise of additional offsetadjustment circuitry. Slew rates of 22 V/μs and a bandwidthof 9 MHz make the OP285 one of the most accurate mediumspeed amplifiers available.
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