AD8021AR-REEL7

Instrumentation, Op Amps, Buffer Amps Overview

The AD8021AR-REEL7 is a single-channel voltage feedback operational amplifier manufactured by Analog Devices Inc. in an SOIC-8 package. It operates within a supply range of ±2.25 V to ±12 V (single 5 V) and draws 7 mA typical quiescent current. Key electrical parameters include a 490 MHz small-signal bandwidth at G=+1, a 120 V/μs slew rate, and 2.1 nV/√Hz input voltage noise. The device features a dedicated disable pin that reduces current consumption to 1.3 mA.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Custom compensation architecture allows users to select gain bandwidth product via an external capacitor, maintaining constant bandwidth across gains from -1 to -10.
• Integrated output disable feature significantly reduces quiescent supply current when the amplifier is not in use.
• Low noise performance with minimal trade-off between speed and power consumption for high-speed instrumentation applications.

Instrumentation, Op Amps, Buffer Amps Applications

• ADC preamplifiers and drivers
• Instrumentation preamplifiers
• Active filters
• Ultrasound signal processing

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the specific REEL7 suffix indicates tape-and-reel packaging compatible with automated surface-mount assembly processes. Confirm the AR designation corresponds to the industrial temperature range of −40°C to +85°C. Ensure logic reference connections align with system voltage levels for proper enable/disable functionality.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this component when designing circuits requiring adjustable bandwidth through external compensation rather than fixed internal poles. Consider the disable pin utility for battery-powered portable systems where standby current reduction is critical. Evaluate the low noise density against source impedance requirements for precision signal conditioning tasks.

Instrumentation, Op Amps, Buffer Amps Part Context

This part belongs to the AD8021 series of high-speed, low-noise amplifiers designed for 16-bit resolution systems. It is functionally identical to the AD8021ARM variant but utilizes an 8-lead SOIC package instead of MSOP. The series emphasizes customizable frequency response characteristics compared to standard voltage feedback amplifiers.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

The AD8021ARMZ serves as a direct lead-free alternative within the same package family. Verify pinout compatibility and thermal dissipation limits when substituting packages. Cross-reference compensation capacitor values if replacing with non-custom compensated amplifiers.

Instrumentation, Op Amps, Buffer Amps FAQ

How does the external compensation capacitor affect the amplifier's bandwidth?

Adding an external capacitor to the CCOMP pin allows the user to customize the gain-bandwidth product, enabling constant bandwidth performance across closed-loop gains ranging from -1 to -10.

What is the function of the DISABLE pin?

The DISABLE pin controls the operational state of the amplifier. Activating this pin reduces the quiescent supply current from approximately 7 mA to 1.3 mA, facilitating power management in portable applications.