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The LMX2306/16/26 are monolithic, integrated frequencysynthesizers with prescalers that are designed to be used togenerate a very stable low noise signal for controlling the lo-cal oscillator of an RF transceiver. They are fabricated usingNational's ABiC V silicon BiCMOS 0.5µ process.
The LMX2306 contains a 8/9 dual modulus prescaler whilethe LMX2316 and the LMX2326 have a 32/33 dual modulusprescaler. The LMX2306/16/26 employ a digital phaselocked loop technique. When combined with a high qualityreference oscillator and loop filter, the LMX2306/16/26 pro-vide the feedback tuning voltage for a voltage controlled os-cillator to generate a low phase noise local oscillator signal.
Serial data is transferred into the LMX2306/16/26 via a threewire interface (Data, Enable, Clock). Supply voltage canrange from 2.3V to 5.5V. The LMX2306/16/26 feature ultralow 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.
LMX2316 Maximum Ratings
Power Supply Voltage VCC1 −0.3V to +6.5V VCC2 -0.3V to +6.5V Vp −0.3V to +6.5V Voltage on Any Pin with GND = 0V (VI) −0.3V to VCC + 0.3V Storage Temperature Range (TS) -65˚C to +150˚C Lead Temperature (TL) (solder, 4 sec.) +260˚C
LMX2316 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
LMX2316 Typical Application
Portable wireless communications (PCS/PCN, cordless Wireless Local Area Networks (WLANs) Cable TV tuners (CATV) Pagers Other wireless communication systems