**AD7940BRJZ-REEL7: A 14-Bit, 250 kSPS Pseudo Differential SAR ADC in a Compact SOT-23 Package**

In the world of data acquisition, achieving high precision in a minimal footprint is a persistent challenge. The **AD7940BRJZ-REEL7** from Analog Devices directly addresses this need, offering a compelling blend of **high resolution and compact form factor**. This 14-bit, 250 kSPS successive approximation register (SAR) analog-to-digital converter (ADC) is packaged in an 8-lead SOT-23, making it an ideal solution for space-constrained and portable applications.

The core of the AD7940's performance lies in its **pseudo differential input architecture**. This design offers a superior alternative to single-ended inputs by providing excellent common-mode noise rejection. It effectively cancels out noise that is common to both the positive and negative input lines, which is a critical advantage in electrically noisy environments typical of industrial control systems, medical instrumentation, and automotive subsystems. This capability ensures the integrity of the acquired signal, leading to more accurate and reliable data.

Despite its tiny package, the AD7940 delivers **impressive ac and dc performance**. With a throughput of 250 kSPS, it can accurately digitize dynamic signals. It features **very low power consumption**, drawing a mere 5 mW at 250 kSPS with a 5 V supply, and this power drops significantly at lower speeds. This makes it exceptionally suitable for battery-powered devices where every milliwatt counts. Furthermore, the ADC includes a versatile serial interface that is compatible with SPI, QSPI, MICROWIRE, and DSP protocols, ensuring easy integration into a wide array of digital systems.

A key benefit of the SAR architecture is its ability to **digitize signals without pipeline delays**. This provides an immediate response to input changes, which is essential for multiplexed applications and control loops where latency is unacceptable. The combination of this instantaneous conversion, high accuracy, and tiny physical size creates a unique value proposition.

**ICGOOFind Summary**: The AD7940BRJZ-REEL7 stands out as a **highly integrated and efficient solution** for designers who cannot compromise on precision or board space. Its robust pseudo differential input, low power operation, and miniature packaging make it a top-tier choice for modern, compact electronic designs across a multitude of industries.

**Keywords**: SAR ADC, Pseudo Differential, Low Power, SOT-23, 14-Bit Resolution.