3GHz I2C Bus Synthesiser

The SP5769 is a single chip frequency synthesiser designed for tuning systems up to 3GHz. The RF preamplifier interfaces direct with the RF programmable divider, which is of MN1A construction so giving a step size equal to the loop comparison frequency and no prescaler phase noise degradation over the full RF operating range. The comparison frequency is obtained either from an on-chip crystal controlled oscillator, or from an external source.

Features
● Complete 3·0 GHz Single Chip System
● Optimised for Low Phase Noise, with Comparison Frequencies up to 4 MHz
● No RF Prescaler
● Selectable Reference Division Ratio
● Selectable Reference/Comparison Frequency Output
● Selectable Charge Pump Current with 10:1 Ratio
● Four Selectable I2C Addresses
● I2C Fast Mode Compliant with 3·3V and 5V Logic Levels
● Four Switching Ports
● Functional Replacement for SP5659 (except ADC)
● Pin Compatible with SP5655
● Power Consumption 110mW with VCC = 5·5V, all Ports off
● ESD Protection 2kV min., MIL-STD-883B Method 3015 Cat.1 (Normal ESD handling procedures should be observed)

Applications
● Digital Satellite and Cable Tuning Systems
● Communications Systems