CA3280E

Overview

The CA3280E is a dual operational transconductance amplifier (OTA) manufactured by Renesas Electronics Corporation, formerly Intersil. It operates within a temperature range of 0°C to 70°C and utilizes a 16-lead PDIP package. The device features a flexible supply voltage range from ±2V to ±15V. Key electrical specifications include a maximum input offset voltage of 3mV at IABC = 1mA, an open-loop bandwidth of 9MHz at IABC = 1mA, and a typical slew rate of 125V/µs. Common mode rejection ratio is typically 100dB.

Feature Summary

• Dual variable operational amplifiers designed to reduce initial input offset voltage and variation with programming current changes.
• Internal current-driven linearizing diodes that reduce external input current to an offset component.
• Interdigitation of critical circuit portions reduces dependence on thermal and processing variables.
• Excellent matching characteristics between the two amplifiers.

Applications

• Voltage Controlled Amplifiers
• Instrumentation Amplifiers
• Function Generators
• Comparators

Procurement Notes

Verify the manufacturer origin as the CA3280 was originally produced by Intersil Corporation before its acquisition by Renesas Electronics. Confirm the specific suffix 'E' corresponds to the commercial temperature range (0°C to 70°C) and the 16-lead PDIP package type E16.3. Ensure compatibility with legacy design requirements referencing Intersil documentation.

Selection Notes

Select this component for applications requiring precise gain control via bias current rather than voltage gain. Consider the internal linearization diodes for reducing AGC thump in audio or instrumentation systems. Evaluate the need for dual matched channels versus single-channel alternatives like the CA3280A if extended temperature ranges are required.

Part Context

The CA3280 belongs to the family of Operational Transconductance Amplifiers (OTAs), which differ from standard op-amps by providing a current output proportional to input voltage. This architecture makes it suitable for building voltage-controlled filters, multipliers, and analog multipliers where high linearity and wide dynamic range are essential.

Replacement Considerations

CA3280AE

FAQ

How does the CA3280 differ from a standard operational amplifier?

Unlike standard op-amps that provide a voltage output, the CA3280 provides a current output determined by its forward transconductance. Its gain is controlled by the amplifier bias current (IABC).

What is the function of the internal linearizing diodes?

The internal linearizing diodes reduce the external input current to an offset component, helping to minimize 'AGC thump' and improve linearity in automatic gain control applications.