LMX2306 – 550 MHz PLLatinum Low Power Frequency Synthesizer for RF Personal Communications
LMX2306/LMX2316/LMX2326
PLLatinum Low Power Frequency Synthesizer for RF
Personal Communications
LMX2306 550 MHz
LMX2316 1.2 GHz
LMX2326 2.8 GHz
General Description
The LMX2306/16/26 are monolithic, integrated frequency synthesizers with prescalers that are designed to be used to generate a very stable low noise signal for controlling the local oscillator of an RF transceiver. They are fabricated using National’s ABiC V silicon BiCMOS 0.5μ process. The LMX2306 contains a 8/9 dual modulus prescaler while the LMX2316 and the LMX2326 have a 32/33 dual modulus prescaler. The LMX2306/16/26 employ a digital phase locked loop technique. When combined with a high quality reference oscillator and loop filter, the LMX2306/16/26 provide the feedback tuning voltage for a voltage controlled oscillator to generate a low phase noise local oscillator signal. Serial data is transferred into the LMX2306/16/26 via a three wire interface (Data, Enable, Clock). Supply voltage can range from 2.3V to 5.5V. The LMX2306/16/26 feature ultra low current consumption; LMX2306 – 1.7 mA at 3V, LMX2316 – 2.5 mA at 3V, and LMX2326 – 4.0 mA at 3V. The LMX2306/16/26 synthesizers are available in a 16-pin TSSOP surface mount plastic package.
Features
* 2.3V to 5.5V operation
* Ultra low current consumption
* 2.5V VCC JEDEC standard compatible
* Programmable or logical power down mode:
— ICC = 1 μA typical at 3V
* Dual modulus prescaler:
— LMX2306 8/9
— LMX2316/26 32/33
* Selectable charge pump TRI-STATE® mode
* Selectable FastLock™ mode with timeout counter
* MICROWIRE™ Interface
* Digital Lock Detect
Applications
* Portable wireless communications (PCS/PCN, cordless)
* Wireless Local Area Networks (WLANs)
* Cable TV tuners (CATV)
* Pagers
* Other wireless communication systems
