ADA4940-2ACPZ-RL

Overview

The ADA4940-2ACPZ-RL 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 suffix ACPZ-RL against the manufacturer's ordering guide to confirm the package type (LFCSP) and reel packaging configuration. Ensure the component meets RoHS compliance standards required for your assembly process. Cross-reference the datasheet revision E specifications with your design requirements before finalizing procurement.

Selection Notes

Select this component for applications requiring high-speed signal conditioning with minimal power consumption. The dual-channel architecture allows for processing two independent signals within a single package. Consider the 24-lead LFCSP footprint for PCB layout constraints and verify thermal dissipation capabilities relative to your ambient operating conditions.

Part Context

This part belongs to the ADA4940 family of fully differential amplifiers manufactured using a SiGe complementary bipolar process. The ADA4940-2 variant specifically integrates two identical amplifier channels, offering a compact solution for multi-channel data acquisition systems compared to using discrete single-channel devices.

Replacement Considerations

The ADA4940-1 serves as the single-channel counterpart within the same family. For higher bandwidth requirements, the ADA4932-1 or AD8137 may be considered, though they exhibit different power and noise characteristics.