AD9874ABST

The AD9874ABST from Analog Devices is a versatile IF Digitizing Subsystem engineered for a broad spectrum of RF applications. It supports input frequencies from 10 MHz to 300 MHz, with an output signal bandwidth ranging from 7.2 kHz to 270 kHz. This device boasts a 12 dB continuous AGC range and a 16 dB front-end attenuator, providing significant dynamic range.

The subsystem includes LO and Sampling Clock Synthesizers, along with a programmable decimation factor and output format. Its architecture is based on a band-pass sigma-delta analog-to-digital converter, offering inherent antialiasing capabilities. The AD9874ABST is suitable for applications requiring high dynamic range and the ability to handle strong blocking signals, potentially reducing IF filtering requirements.

Packaged in a 48-lead LQFP with dimensions of 7x7 mm and a height of 1.4 mm, the AD9874ABST is designed for surface mount applications. It operates from a 2.7 V to 3.6 V supply voltage and consumes low current, making it suitable for portable and mobile radio products, base station applications, and SATCOM terminals.

Key features include a 0 dBm IIP3, an 8.1 dB SSB NF, and an AGC-free range up to –34 dBm. The device offers a 16-bit (or 24-bit) serial digital output and utilizes an internal reference. Its SPI interface allows for programming of various parameters, including synthesizer settings, AGC attenuation, decimation factor, and output data format.