The LMX2305 is a high performance frequency synthesizer designed for RF operation up to 550 MHz. It uses digital phase lock loop technique, combined with a high quality reference oscillator and a loop filter, to provide the tuning voltage for the voltage controlled oscillator and generate a very stable, low noise local oscillator signal.
The LMX2305 is a high performance frequency synthesizer with an integrated prescaler designed for RF operation up to 550 MHz. It is fabricated using National's ABIC IV BiCMOS process and features a dual modulus prescaler which can select either a 64/65 or a 128/129 divide ratio at input frequencies of up to 550 MHz.
The device employs the digital phase lock loop technique combined with a high quality reference oscillator and a loop filter to provide tuning voltage for a voltage controlled oscillator. Serial data is transferred via a three line MICROWIRE interface, and supply voltage can range from 2.65V to 5.5V. The LMX2305 features very low current consumption, typically 4.0 mA at 2.75V, and is available in a TSSOP 20-pin surface mount plastic package.
| RF Input Operating Frequency | 45 to 550 MHz |
|---|---|
| Oscillator Input Operating Frequency | 5 to 22 MHz |
| Phase Detector Frequency | 10 MHz |
| Power Supply Current | 4 to 6 mA |
| Power Down Current | 30 to 180 pA |
| Supply Voltage Range | 2.65V to 5.5V |
| Operating Temperature | -40°C to +85°C |
| Package Type | TSSOP 20-pin |
The maximum RF input operating frequency is 550 MHz.
The typical current consumption is 4.0 mA at 2.75V.
The device can select either a 64/65 or a 128/129 divide ratio.