**AD7490BCP: A Comprehensive Technical Overview of the 16-Channel, 1 MSPS, 12-Bit SAR ADC**

The AD7490BCP from Analog Devices represents a highly integrated solution for precision data acquisition systems requiring multiple analog input channels. As a **16-channel, 12-bit successive approximation register (SAR) analog-to-digital converter (ADC)**, it delivers a **maximum throughput rate of 1 MSPS (Million Samples Per Second)**, making it suitable for a wide array of industrial, medical, and communication applications.

This ADC is built on a robust SAR architecture, renowned for its deterministic operation and low latency. Unlike delta-sigma (ΔΣ) ADCs that require filter settling time, the SAR core provides a single conversion result upon completion of a conversion cycle, which is critical for control loops and multiplexed systems where speed is essential. The device features a **fully integrated 16-channel multiplexer** with an address sequencer, allowing both sequential and random channel selection through its serial interface. This simplifies the design process by reducing the need for external components and complex control logic.

A key advantage of the AD7490BCP is its **low power consumption**, typically drawing 13.5 mW at 1 MSPS with a 5 V supply. Its power dissipation scales linearly with throughput, an important feature for power-sensitive portable or battery-operated equipment. The ADC operates from a single 2.7 V to 5.25 V supply, providing flexibility in interfacing with both 3 V and 5 V microcontroller and DSP-based systems.

The analog input range is 0 V to VREF, with the reference voltage typically set at 2.5 V, though it can operate up to the supply voltage. The device incorporates a **high-speed serial interface (SPI/QSPI/MICROWIRE/DSP compatible)** for communication with a host processor. For system-level synchronization, it offers a **hardware conversion start pin (`CONVST`)**. A single conversion can be initiated by pulsing this pin, giving the designer precise control over the sampling instant, which is vital for synchronizing acquisitions with external events.

The AD7490BCP is offered in a compact 32-lead LFCSP (Lead Frame Chip Scale Package), which provides an excellent balance of small size and thermal performance. Its combination of high channel count, high speed, and integrated features makes it an ideal choice for complex multi-channel systems such as optical network control, instrumentation, and automated test equipment (ATE).

**ICGOODFIND:** The AD7490BCP integrates a complete 16-channel data acquisition system into a single chip, offering an exceptional blend of **high speed (1 MSPS), precision (12-bit), low power, and channel density**, making it a premier choice for demanding multi-sensor applications.

**Keywords:** 16-Channel Multiplexer, 1 MSPS, 12-Bit Resolution, SAR ADC, Low Power Consumption.