ADA4940-2ACPZ-R7

Overview

The ADA4940-2ACPZ-R7 is a dual-channel fully differential amplifier from Analog Devices, designed as an ultralow power ADC driver. It features a small signal bandwidth of 260 MHz and a slew rate of 95 V/µs. The device operates on flexible power supplies ranging from 3 V to 7 V with a quiescent current of 1.25 mA per channel. Key electrical parameters include an input voltage noise of 3.9 nV/√Hz, a maximum offset voltage of 0.35 mV, and a settling time to 0.1% of 34 ns. It utilizes a 24-lead LFCSP package.

Feature Summary

• Provides balanced differential outputs with internal common-mode feedback for exceptional output balance and suppression of even-order harmonic distortion products.
• Features adjustable output common-mode voltage to match the input requirements of various SAR and Sigma-Delta ADCs.
• Includes a disable pin that significantly reduces power consumption when the amplifier is not in use.

Applications

• Low power PulSAR/SAR ADC drivers
• Single-ended-to-differential conversion
• Differential buffers
• Line drivers

Procurement Notes

Verify the specific ordering suffix R7 corresponds to the reel packaging configuration required for your assembly process. Confirm the component matches the 24-lead LFCSP package outline dimensions and pin assignments detailed in the official datasheet before finalizing procurement specifications.

Selection Notes

Select this component for applications requiring low noise and high linearity in data acquisition systems. Ensure the supply voltage remains within the 3 V to 7 V range for optimal performance. Consider the thermal resistance characteristics of the LFCSP package when designing the PCB layout for adequate heat dissipation.

Part Context

This part belongs to the ADA4940 family of fully differential amplifiers manufactured using a SiGe complementary bipolar process. The dual-channel variant (ADA4940-2) offers two independent amplifiers in a single package, facilitating compact designs for multi-channel signal processing applications compared to single-channel alternatives.

Replacement Considerations

The ADA4940-1 serves as the single-channel counterpart within the same family. For higher speed requirements, the ADA4932-1 or AD8137 may be considered, though they differ significantly in power consumption and bandwidth specifications.