125 – 1000 MHz Frequency Synthesizer

The MC12181 is a monolithic bipolar synthesizer integrating a high performance prescaler, programmable divider, phase/frequency detector, charge pump, and reference oscillator/buffer functions. The device is capable of synthesizing a signal which is 25 to 40 times the input reference signal. The device has a 4–bit parallel interface to set the proper total multiplication which can range from 25 to 40. When combined with an external passive loop filter and VCO, the MC12181 serves as a complete PLL subsystem.

• 2.7 to 5.5 V Operation

• Low power supply current of 4.25 mA typical

• On chip reference oscillator/buffer supporting wide frequency operating range from 5 to 25 MHz

• 4–bit parallel interface for programming divider (N = 25 .... 40)

• Wide 125 – 1000 MHz frequency of operation

• Digital phase/frequency detector with linear transfer function

• Balanced Charge Pump Output

• Space efficient 16 lead SOIC package

• Operating Temperature Range of –40 to 85°C

• > 1000 V ESD Protection (I/O to Ground, I/O to VCC)