ADEL2020AR-20

Overview

The ADEL2020AR-20 is a high-speed current feedback operational amplifier designed as an improved second source to the EL2020. It operates within a supply voltage range of ±3.0 V to ±18 V and supports an industrial temperature range of –40 °C to +85 °C. The device features a quiescent supply current of 6.8 mA, reducing to 2.1 mA in power-down mode. Key dynamic specifications include a 90 MHz bandwidth at unity gain, a 500 V/μs slew rate, and a 60 ns settling time to 0.1%. It offers low input voltage noise of 2.9 nV/√Hz and excellent video performance with differential gain of 0.02% and differential phase of 0.04°.

Feature Summary

• Optimized for high-performance video applications with minimal differential gain and phase errors when driving back-terminated cables.
• Features a high-performance disable function that provides break-before-make operation and significant input-to-output isolation in the off state.
• Delivers high output drive capability with short-circuit protection and the ability to drive capacitive loads directly without oscillation.
• Provides lower power consumption compared to previous generation devices while maintaining superior dynamic specifications.

Applications

• Video line drivers
• Data acquisition systems
• High-speed signal conditioning

Procurement Notes

Verify the specific package variant, as the ADEL2020AR-20 denotes the 20-lead SOIC configuration. Confirm the operating temperature range requirements match the industrial specification of –40 °C to +85 °C. Ensure circuit designs account for the current feedback architecture, which requires specific feedback resistor values to maintain stability and desired bandwidth. Check absolute maximum ratings for supply voltage limits to prevent permanent damage.

Selection Notes

Select this component for applications requiring wide bandwidth and fast settling times with low distortion. The current feedback topology makes it suitable for fixed-gain applications where bandwidth independence from gain is less critical than speed. Consider the disable pin functionality if system-level switching or multiplexing is required. Evaluate power supply bypassing needs carefully, as adequate decoupling is essential for optimizing high-frequency performance and minimizing peaking.

Part Context

The ADEL2020 series serves as an enhanced alternative to legacy video amplifiers, offering improvements in power efficiency and dynamic performance. It is part of Analog Devices' portfolio of high-speed analog components designed for demanding signal processing tasks. The AR-20 suffix specifically identifies the 20-lead small outline integrated circuit package version of this amplifier.

Replacement Considerations

The ADEL2020 is explicitly documented as an improved second source to the EL2020. Designers replacing the EL2020 should verify that the updated dynamic specifications and pinout compatibility meet their existing circuit requirements.

FAQ

How does the ADEL2020 achieve disable functionality?

Pulling the Pin 8 voltage to common (0 V) disables the amplifier, dropping supply current and presenting a high-impedance output. Break-before-make operation is guaranteed, with a turn-off time of approximately 100 ns.

What is the recommended approach for handling capacitive loads?

The ADEL2020 can drive capacitive loads exceeding 1000 pF directly. For larger capacitances, inserting a small resistor (typically less than 50 Ω) in series with the output helps maintain stability and flat gain response.