Microsemi Corp. Integrated Circuits (ICs) - Clock-Timing - Clock Generators, PLLs, Frequency Synthesizers SP8853/A/HC

The SP8853/A/HC is a low power single-chip synthesizer designed for professional radio applications, integrating all necessary components for a PLL frequency synthesis loop, excluding the loop amplifier. It features a three-wire serial programming interface and includes three independent buffers for storing one reference divider word and two local oscillator divider words. The device incorporates a digital phase detector with two programmable charge pumps to enhance lock-up performance, allowing for adjustable phase and gain settings. Operating at a frequency of 1.3 GHz, the SP8853/A/HC is specified for a wide temperature range, from -55¬8C to +125¬8C for military applications and -40¬8C to +85¬8C for industrial use. It offers a power-down mode for battery conservation and supports a variety of reference division ratios, enabling rapid frequency toggling through local storage of two frequency words. The device is characterized by low operating power consumption, typically around 175 mW, and high input sensitivity, making it suitable for demanding applications in radio frequency synthesis.