ADA4897-1ARZ

Overview

The ADA4897-1ARZ is a single-channel, unity-gain stable, low noise, rail-to-rail output, high-speed voltage feedback operational amplifier manufactured by Analog Devices Inc. It features a wide supply range of 3 V to 10 V and operates over an extended industrial temperature range from -40°C to +125°C. The device incorporates a proprietary SiGe bipolar process to achieve a quiescent current of 3 mA per amplifier while maintaining exceptional dynamic performance. Key electrical specifications include a -3 dB bandwidth of 230 MHz at G = +1, a slew rate of 120 V/µs, and a settling time to 0.1% of 45 ns. Input offset voltage is specified with a maximum of ±500 µV and a drift of 0.2 µV/°C. The amplifier provides a spurious-free dynamic range of -80 dBc at 2 MHz and includes a dedicated disable pin for power management.

Feature Summary

• Features a rail-to-rail output stage designed to maximize dynamic range in low-voltage single-supply applications.
• Incorporates a dedicated disable pin that allows the amplifier to be powered down to minimize system energy consumption.
• Utilizes a proprietary SiGe bipolar process architecture to deliver high speed and low noise simultaneously.
• Provides unity-gain stability without requiring external compensation components.

Applications

• Low noise preamplifiers
• Ultrasound amplifiers
• PLL loop filters
• High performance ADC drivers
• DAC buffers

Procurement Notes

Verify the specific package configuration when ordering, as the ADA4897-1 series is available in both 8-lead SOIC and 6-lead SOT-23 formats. Confirm that the ARZ suffix corresponds to the standard lead-free RoHS-compliant tube packaging rather than tape-and-reel variants. Ensure the selected part number matches the required thermal resistance characteristics for your specific PCB layout and ambient operating conditions.

Selection Notes

Select this component when designing circuits that require high bandwidth combined with ultra-low input voltage noise density. The inclusion of a disable pin makes it suitable for battery-powered systems where power conservation during idle states is critical. Consider the 8-lead SOIC package for easier prototyping and manual assembly, while evaluating the thermal dissipation capabilities relative to the expected load drive requirements.

Part Context

This device belongs to the ADA4896-2/ADA4897-1/ADA4897-2 family of high-speed amplifiers. While the ADA4896-2 offers dual channels and the ADA4897-2 provides dual channels with two disable pins, the ADA4897-1ARZ specifically provides a single channel solution. All members of this family share the same underlying SiGe bipolar technology and core electrical performance metrics regarding noise and speed.

Replacement Considerations

Direct functional replacements within the same product family include the ADA4897-1ARJZ (SOT-23-6 package) or the ADA4897-1ARZ-R7 (SOIC-8 tape and reel). Verify pin compatibility and package dimensions before substituting, as physical footprint differences exist between the SOIC and SOT-23 versions.