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IC CA3140 datasheet

2016-10-12 17:56  
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CA3140 is the 4.5MHz BiMOS Operational Amplifier with MOSFET inputs and Bipolar output. This Op Amp combines the advantage of PMOS transistors and high voltage bipolar transistors. CA3140 has gate protected MOSFETs (PMOS) transistors in the input circuit to provide very high input impedance typically around 1.5T Ohms.The IC requires very low input current as low as 10pA to change the output status, high or low. The IC has very fast response and high speed of performance. The output stage of the IC uses bipolar transistors and includes built in protection against damage from load terminal short circuiting to either supply rails or to ground. The use of PMOS FET in the input stage results in common mode input voltage capabilities down to 0.5 volts below the negative supply terminals. These operational amplifiers are internally phase compensated to achieve stable operation in unity gain follower operation, and additionally, have access terminal for a supplementary external capacitor if additional frequency roll-off is desired. Terminals are also provided for use in applications requiring input offset voltage Nulling. Pin connectionsThe CA3140 Series has the same 8-lead pin out Pin1Offset NullPin2 Inverting input INVPin3 Non inverting input Non-INVPin4 Ground- Negative supplyPin5 Offset NullPin6 OutputPin7 Positive supplyPin8 Strobe Operating conditions Supply voltage 36 volt maximumInput terminal current 1mA CA3140 Block Diagram Nulling of Offset Voltage The input offset voltage can be nulled by connecting a 10K pot between the terminals 1 and 5 and returning its wiper to the ground. This technique, however, gives more adjustment range than required and therefore, a considerable portion of the potentiometer rotation is not fully utilized.