®
CA3280, CA3280A
Data Sheet May 2002 FN1174.6
Dual, 9MHz, Operational Transconductance Amplifier (OTA)
The CA3280 and...
®
CA3280, CA3280A
Data Sheet May 2002 FN1174.6
Dual, 9MHz, Operational Transconductance Amplifier (OTA)
The CA3280 and CA3280A types consist of two variable operational
amplifiers that are designed to substantially reduce the initial input offset
voltage and the offset
voltage variation with respect to changes in programming current. This design results in reduced “AGC thump,” an objectionable characteristic of many AGC systems. Interdigitation, or crosscoupling, of critical portions of the circuit reduces the amplifier dependence upon thermal and processing variables. The CA3280 has all the generic characteristics of an operational
voltage amplifier except that the forward transfer characteristics is best described by transconductance rather than
voltage gain, and the output is current, not
voltage. The magnitude of the output current is equal to the product of transconductance and the input
voltage. This type of operational transconductance amplifier was first introduced in 1969, and it has since gained wide acceptance as a gateable, gain controlled building block for instrumentation and audio applications, such as linearization of transducer outputs, standardization of widely changing signals for data processing, multiplexing, instrumentation
amplifiers operating from the nanopower range to high current and high speed comparators. For additional application information on this device and on OTAs in general, please refer to Application Notes: AN6818, AN6668, and AN6077.
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