**AD7943BRZ: A 14-Bit, 250 kSPS Pseudo Differential SAR ADC for Precision Data Acquisition Systems**

In the realm of precision data acquisition, the choice of an analog-to-digital converter (ADC) is paramount, dictating the system's overall accuracy, speed, and power efficiency. The **AD7943BRZ from Analog Devices** stands out as a compelling solution, engineered to deliver high performance in a compact package. This 14-bit, 250 kSPS successive approximation register (SAR) ADC is specifically designed for applications demanding **exceptional precision and robust performance** in challenging environments.

At the core of the AD7943BRZ is a highly stable SAR architecture, renowned for its **deterministic operation and low latency**. Unlike delta-sigma (ΔΣ) ADCs that require filter settling time, a SAR ADC provides an instantaneous conversion result, making it ideal for multiplexed applications and control systems where a rapid response to changing analog signals is critical. The device's **pseudo differential input** structure offers a superior alternative to single-ended inputs by providing a means to reject common-mode noise. This is particularly valuable in industrial settings where ground loops and electromagnetic interference (EMI) can severely degrade measurement accuracy. The pseudo differential input allows the negative input (IN–) to be driven by a signal, typically a reference ground or a common-mode voltage, which helps cancel out noise present on both input lines.

The **AD7943BRZ operates from a single 2.5 V to 5.5 V supply**, making it versatile for both portable, battery-powered equipment and larger-scale industrial systems. Its power consumption is a mere 8 mW at 5 V when operating at the full 250 kSPS rate, and it features a flexible power-down mode that reduces consumption to just 1 µW, enabling significant energy savings in power-sensitive applications. This combination of speed and low power is a key advantage.

Furthermore, the ADC integrates a robust **internal reference voltage of 2.5 V**, which is a significant benefit for simplifying system design and reducing the bill of materials (BOM). For applications requiring higher accuracy over temperature, designers can optionally bypass this internal reference and utilize an external, more precise reference source. The serial interface is SPI/QSPI™/MICROWIRE™/DSP compatible, ensuring easy connection to a wide array of modern microcontrollers and digital processors.

Typical applications that benefit from the AD7943BRZ's feature set include:

* **Industrial Instrumentation and Process Control:** For precise sensor measurement (e.g., pressure, temperature, flow).

* **Battery-Powered Equipment:** Portable medical devices and handheld test instruments where power efficiency is crucial.

* **Data Acquisition Systems (DAQs):** Especially those with multiple input channels requiring high throughput per channel.

* **Motor Control and Power Monitoring:** Where fast feedback loops and noise immunity are essential.

**ICGOO**DFIND: The AD7943BRZ is a high-performance, versatile SAR ADC that successfully balances speed, accuracy, and power consumption. Its **pseudo differential input provides essential noise rejection**, its **low-power features enhance portability**, and its **integrated reference simplifies design**, making it an excellent choice for engineers developing advanced precision data acquisition systems.

**Keywords:**

1. **Pseudo Differential ADC**

2. **14-Bit Resolution**

3. **250 kSPS**

4. **SAR Architecture**

5. **Low Power Consumption**