PDF datasheet for the CA3140, a BiMOS operational amplifier with MOSFET inputs and bipolar output stage, originally from RCA and later Intersil. The 1.23 MB document includes pinout, absolute maximum ratings, input bias current figures, slew rate and many application circuits. It helps when diagnosing analog stages in test equipment, sensors and audio gear: verify supply pins, compare node voltages with typical values, and confirm whether a generic op-amp can replace it, keeping in mind its very high input impedance.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @datasheet. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.