LMX2306 Datasheet | National Semiconductor

LMX2306/LMX2316/LMX2326 PLLatinum Low Power Frequency Synthesizer for RF Personal munications April 2000 LMX2306/LMX2316/LMX2326 PLLatinum™ Low Power Frequency Synthesizer for RF Personal munications 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 ABi C V silicon Bi CMOS 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 bined 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 m A at 3V, LMX2316 - 2.5 m A at 3V, and LMX2326 - 4.0 m A at 3V. The LMX2306/16/26 synthesizers are available in a 16-pin TSSOP surface mount plastic package. Features n n n n n 2.3V to 5.5V operation Ultra low current consumption 2.5V VCC JEDEC standard patible 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 Fast Lock™ mode with timeout counter MICROWIRE™ Interface Digital Lock Detect n n n n Applications n n n n n Portable wireless munications (PCS/PCN, cordless) Wireless Local Area Networks (WLANs) Cable TV tuners (CATV) Pagers Other wireless munication systems Functional Block Diagram DS100127-1 TRI-STATE ® is a registered trademark of National Semiconductor...