**AD7628KN: A Comprehensive Technical Overview of the 18-Bit, 8-Channel SAR ADC**
In the realm of high-precision data acquisition, the **AD7628KN from Analog Devices** stands as a prominent solution, engineered to deliver exceptional performance in demanding applications. This 18-bit, 8-channel successive approximation register (SAR) analog-to-digital converter (ADC) combines high resolution with high channel density, making it a cornerstone for complex measurement systems.
At the core of the AD7628KN is a **high-speed, 18-bit SAR architecture** capable of achieving a throughput of up to 800 kSPS. This speed is remarkable for an ADC of its resolution, enabling the precise digitization of fast-changing signals. The device incorporates eight analog input channels, which are multiplexed into a single, high-performance ADC core. A flexible sequencer allows users to program the conversion order of these channels, providing significant system design flexibility for scanning multiple sensors.
A defining feature of the AD7628KN is its **outstanding ac and dc performance**. It boasts excellent linearity, with a typical integral nonlinearity (INL) of ±2.5 LSB and no missing codes at 18 bits, ensuring accurate representation of the input signal. For dynamic applications, it offers a wide bandwidth and a superb signal-to-noise ratio (SNR), typically 96 dB, making it suitable for precision instrumentation, spectrum analysis, and medical imaging.
The interface is designed for ease of use and system integration. It features both a high-speed parallel interface and a serial interface (SPI), allowing for seamless connection to a wide range of microprocessors, microcontrollers, and digital signal processors (DSPs). An internal reference voltage of 2.5 V is provided, which is **trimmed for high accuracy and low drift**, though the design also supports an external reference for applications requiring even higher precision or a different voltage range.
Housed in a 48-lead LQFP package, the AD7628KN is specified to operate over the industrial temperature range (-40°C to +85°C), ensuring reliability in harsh environments. Its combination of high channel count, resolution, and speed makes it an ideal choice for a vast array of applications, including **industrial automation, defense systems, scientific research, and medical instrumentation**.
**ICGOODFIND:** The AD7628KN is a high-performance, highly integrated ADC that masterfully balances resolution, channel count, and conversion speed, serving as a robust and versatile foundation for sophisticated data acquisition systems.
**Keywords:** 18-Bit Resolution, 8-Channel Multiplexer, SAR ADC, High-Speed Data Acquisition, Low Noise Performance
