ADA4940-1ARZ

Overview

The ADA4940-1ARZ is a fully differential amplifier designed as an ultralow power, low distortion 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 amplifier. It provides balanced outputs with adjustable common-mode voltage and includes a disable pin for power reduction. The input offset voltage is typically 0.06 mV, and the input voltage noise is 3.9 nV/√Hz. It is available in an 8-lead SOIC package.

Feature Summary

• Ultralow power consumption with 1.25 mA quiescent current per amplifier
• Extremely low harmonic distortion performance across wide frequency ranges
• Adjustable output common-mode voltage matching multiple ADC inputs
• Internal common-mode feedback loop ensures exceptional output balance

Applications

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

Procurement Notes

Verify the specific ordering suffix ARZ corresponds to the 8-lead SOIC package variant when sourcing. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure supply chain availability aligns with project timelines as distribution channels may vary. Cross-reference the datasheet revision E specifications against the received component lot to guarantee parameter consistency.

Selection Notes

Select this component for applications requiring high-speed signal conditioning with minimal power draw. The 260 MHz bandwidth supports high-frequency data acquisition tasks. The adjustable VOCM feature simplifies interface design with various analog-to-digital converters. Consider the 8-lead SOIC package for standard PCB layouts where thermal dissipation requirements are moderate compared to LFCSP options.

Part Context

The ADA4940-1 is part of the ADA4940 family of fully differential amplifiers manufactured by Analog Devices. This series utilizes a SiGe complementary bipolar process to achieve low distortion and noise characteristics. The ADA4940-1 specifically offers a single-channel configuration, contrasting with the dual-channel ADA4940-2. It is optimized for driving high-resolution SAR and Sigma-Delta ADCs in portable and industrial electronics.

Replacement Considerations

The AD8137 serves as a complementary product offering higher bandwidth but increased power consumption. Designers should evaluate the trade-off between the ADA4940-1's ultralow power profile and the alternative's speed capabilities. Verify pin compatibility and thermal requirements when transitioning between these distinct amplifier families.