ADA4897-2ARMZ

Overview

The ADA4897-2 is a dual-channel, unity-gain stable, low noise, rail-to-rail output, high speed voltage feedback amplifier manufactured by Analog Devices. It features a quiescent current of 3 mA per amplifier and operates within a wide supply voltage range of 3 V to 10 V. The device utilizes a proprietary SiGe bipolar process to achieve a -3 dB bandwidth of 230 MHz at G = +1 and a slew rate of 120 V/μs. It settles to 0.1% in 45 ns with an input offset voltage maximum of 500 μV. The component includes dedicated disable pins for each channel and is housed in a 10-lead MSOP package.

Feature Summary

• Features a low noise floor with 1 nV/√Hz broadband noise and 2.4 nV/√Hz at 10 Hz.
• Includes independent disable functionality for both amplifier channels.
• Provides rail-to-rail output swing compatible with single or dual supplies.
• Delivers high-speed performance with 230 MHz bandwidth and 120 V/μs slew rate.

Applications

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

Procurement Notes

Verify the specific package configuration and pinout compatibility before integration. Confirm that the disable logic levels align with the system control voltages. Ensure thermal management meets the junction temperature limits specified in the datasheet. Check for any recent revision updates that may affect parameter tolerances or ordering suffixes.

Selection Notes

Select this component when dual-channel operation is required alongside low noise and high speed characteristics. The integrated disable feature offers power management benefits over non-disable variants. Consider the 10-lead MSOP package constraints regarding PCB layout and thermal dissipation compared to other package options in the series.

Part Context

This part belongs to the ADA4896-2/ADA4897-1/ADA4897-2 family of low noise, rail-to-rail output amplifiers. It shares core electrical specifications with the ADA4896-2 and ADA4897-1 but differs in channel count and packaging. The ADA4897-2 specifically provides two channels in a 10-lead MSOP format, distinguishing it from the single-channel ADA4897-1.

Replacement Considerations

The ADA4896-2 serves as a dual-channel alternative in different packages. The ADA4897-1 is a single-channel equivalent with identical electrical performance but requires separate components for dual-channel designs. Verify pinout differences when substituting between these family members.

FAQ

How does the disable feature function on the ADA4897-2?

The ADA4897-2 includes two separate disable pins, one for each channel. Driving the pin below the threshold voltage disables the respective amplifier, reducing quiescent current significantly.

What is the maximum input offset voltage for this device?

The maximum input offset voltage is specified as 500 μV across the operating temperature range.