Dual 1.1 GHz PLL Frequency Synthsizer BiCMOS

The MC145220 is a low–voltage, single–chip frequency synthesizer with serial interface capable of direct usage up to 1.1 GHz. The device simultaneously supports two loops. The two on–chip dual–modulus prescalers may be independently programmed to divide by either 32/33 or 64/65.
The device consists of two dual–modulus prescalers, two 6–stage A counters, two 12–stage N counters, two fully programmable 13–stage R (reference) counters, and two lock detectors. Four phase/frequency detectors are included: two with current source/sink outputs and two with double–ended outputs.

• Operating Frequency: 40 to 1100 MHz
• Operating Supply Voltage Range: 2.7 to 5.5 V
• Supply Current: Both PLLs Operating — 12 mA Nominal
                            One PLL Operating, One on Standby — 6.5 mA Nominal
                            Both PLLs on Standby — 30 µA Maximum
• Phase Detector Output Current: Up to 2 mA @ 5 V
                                                      Up to 1 mA @ 3 V
• Operating Temperature Range: – 40 to 85°C
• Independent R Counters Allow Use of Different Step Sizes for Each Loop
• Double–Buffered R Register — Reference and Loop Divide Ratios Updated Simultaneously
• R Counter Division Range: 1 and 10 to 8,191
• Dual–Modulus Capability Provides Total Division of the VCO Frequency up to 262,143
• Direct Interface to Motorola SPI Data Port
• Evaluation Kit Available (Part Number MC145220EVK)
• See Application Note AN1253/D for Low–Pass Filter Design, and AN1277/D for Offset Reference PLLs for Fine Resolution or Fast Hopping