**AD7656ABSTZ: A 16-Bit, 1 MSPS, Simultaneous Sampling SAR ADC for Precision Measurement Systems**

In the realm of high-performance data acquisition, the ability to accurately capture multiple analog signals at the same instant is paramount. The **AD7656ABSTZ from Analog Devices** stands as a pinnacle component designed to meet this critical demand in precision measurement systems. This integrated circuit is a **16-bit, 1 MSPS (Mega Sample Per Second), simultaneous sampling SAR ADC** that combines high speed, exceptional accuracy, and integrated functionality to simplify complex system design.

The core of the AD7656ABSTZ's value proposition is its **simultaneous sampling capability**. It incorporates six independent ADC channels, each with its own sample-and-hold amplifier. This architecture ensures that the voltage on all six input channels is captured at precisely the same moment, eliminating timing skew and phase errors between channels. This feature is indispensable in applications like polyphase power metering, condition monitoring, and three-phase motor control, where the relationship between multiple AC signals is critical for accurate analysis and control.

Leveraging the **Successive Approximation Register (SAR)** architecture, the ADC delivers excellent performance with **16-bit resolution and no latency**. This means every conversion result is available immediately after the conversion cycle, making it ideal for tight control loops and real-time processing systems. The specified 1 MSPS throughput rate applies when all six channels are converted sequentially, providing a high aggregate data rate for multi-channel systems.

Beyond its sampling prowess, the AD7656ABSTZ is engineered for precision. It achieves outstanding **dynamic performance and high SNR (Signal-to-Noise Ratio)**, ensuring that even small analog signals are digitized with clarity and minimal distortion. The device operates over a wide supply range and features flexible power management modes, including a fast wake-up time from standby, which is crucial for power-sensitive portable instruments.

Integration is another key strength. The component includes essential system functions on-chip, such as a **2.5 V internal reference and reference buffers**, which enhance overall system accuracy while reducing the bill of materials and board space. Its serial interface simplifies isolation and connection to modern processors, FPGAs, or DSPs.

**ICGOOFind Summary:** The AD7656ABSTZ is a highly integrated, high-performance solution that sets the benchmark for multi-channel precision data acquisition. Its unique combination of simultaneous sampling, true 16-bit accuracy, and 1 MSPS speed makes it an indispensable component for designers tackling the most challenging measurement problems in industrial, medical, and test equipment.

**Keywords:** Simultaneous Sampling, 16-Bit Resolution, 1 MSPS, SAR ADC, Precision Measurement.