IC CA3140 DATASHEET PDF

Supply voltage 36 volt maximum Input terminal current 1mA CA 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. A current regulator based upon the PMOS threshold voltage maintains reasonable constant operating current and hence consistent performance down to these lower voltages. Bandwidth and Slew Rate For those cases where bandwidth reduction is desired, for example, broadband noise reduction, an external capacitor connected between Terminals 1 and 8 can reduce the open loop -3dB bandwidth.

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Supply voltage 36 volt maximum Input terminal current 1mA CA 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. A current regulator based upon the PMOS threshold voltage maintains reasonable constant operating current and hence consistent performance down to these lower voltages.

Bandwidth and Slew Rate For those cases where bandwidth reduction is desired, for example, broadband noise reduction, an external capacitor connected between Terminals 1 and 8 can reduce the open loop -3dB bandwidth.

The slew rate will, however, also be proportionally reduced by using this additional capacitor. Input Circuit Considerations The amplifier inputs can be driven below the terminal 4 potential, but a series current limiting resistor is recommended to limit the maximum input terminal current to less than 1mA to prevent damage to the input protection circuitry. Moreover, some current limiting resistance should be provided between the inverting input and the output when the CA is used as a unity gain voltage follower.

This resistance prevents the possibility of extremely large input signal transients from forcing a signal through the input protection network and directly driving the internal constant current source which could result in positive feedback via the output terminal. The typical input current is on the order of 10pA when the inputs are centered at nominal device dissipation. As the output supplies load current, device dissipation will increase, raising the chip temperature and resulting in increased input Current.

It is well known that MOSFET devices can exhibit slight changes in characteristics due to the application of large differential input voltages that are sustained over long periods at elevated temperatures. Both applied voltage and temperature accelerate these changes. The process is reversible and offset voltage shifts of the opposite polarity reverse the offset.

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