**AD7869JRZ: A 14-Bit, 4-Channel Simultaneous Sampling SAR ADC for Precision Data Acquisition Systems**

In the realm of precision data acquisition, the ability to accurately capture multiple analog signals at the same instant is paramount. This is especially critical in applications such as polyphase motor control, power quality monitoring, and advanced instrumentation, where the phase relationship between channels must be preserved. The **AD7869JRZ** from Analog Devices stands out as a premier solution, engineered to meet these demanding requirements with its high performance and integrated functionality.

At its core, the AD7869JRZ is a **14-bit, 4-channel simultaneous sampling SAR ADC**. The successive approximation register (SAR) architecture is chosen for its excellent trade-off between speed, accuracy, and power consumption, making it ideal for precision applications. The device's defining feature is its four complete analog-to-digital conversion channels, each comprising a sample-and-hold amplifier. This unique design ensures that all four input channels are sampled at precisely the same moment, eliminating skew and preserving the critical phase information between inputs—a significant advantage over multiplexed single-ADC alternatives.

The converter boasts a fast throughput rate of up to **250 kSPS** for each channel. This speed, combined with its **true simultaneous sampling capability**, makes it perfectly suited for capturing transient events and rapidly changing waveforms across all inputs. The AD7869JRZ offers exceptional DC accuracy with **low integral and differential non-linearity (INL/DNL)**, ensuring that each of the 16,384 possible codes is accurately represented. Furthermore, it provides outstanding signal-to-noise ratio (SNR) and spurious-free dynamic range (SFDR), which are crucial for resolving small signals in the presence of noise and harmonics.

Ease of integration is a key benefit of this ADC. It operates from a single +5 V supply and features a flexible, high-speed parallel interface for seamless connection to modern microcontrollers, DSPs, and FPGAs. The device also includes a versatile 2.5 V internal reference, which can be overdriven by an external reference for applications requiring enhanced accuracy or a different voltage range.

Typical applications that leverage the strengths of the AD7869JRZ include:

* **Three-Phase Power Control and Analysis:** Simultaneously measuring phase currents and voltages in industrial motor drives and power inverters.

* **Multi-Axis Vibration and Condition Monitoring:** Capturing synchronized data from multiple sensors in mechanical systems.

* **Advanced Medical Imaging and Diagnostic Equipment:** Where multiple precise measurements must be taken concurrently.

* **Automotive Test and Measurement:** For analyzing complex, multi-sensor systems.

**ICGOOODFIND:** The AD7869JRZ is a high-performance, highly integrated ADC that solves the critical challenge of **phase-accurate, multi-channel data acquisition**. Its combination of **14-bit resolution, true simultaneous sampling, and robust parallel interface** makes it an indispensable component for designers building sophisticated systems in industrial, automotive, and scientific fields.

**Keywords:** Simultaneous Sampling SAR ADC, 14-Bit Resolution, Precision Data Acquisition, Multi-Channel ADC, Phase-Coherent Measurement.