LMX2305 Datasheet | National Semiconductor

LMX2305 PLLatinum 550 MHz Frequency Synthesizer for RF Personal munications PRELIMINARY August 1996 LMX2305 PLLatinum TM 550 MHz Frequency Synthesizer for RF Personal munications General Description 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 ABi C IV Bi CMOS process The LMX2305 contains 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 LMX2305 which employs the digital phase lock loop technique bined with a high quality reference oscillator and a loop filter provides the tuning voltage for the voltage controlled oscillator to generate a very stable low noise local oscillator signal Serial data is transferred into the LMX2305 via a three line MICROWIRETM interface (Data Enable Clock) Supply voltage can range from 2 65V to 5 5V The LMX2305 Features very low current consumption typically 4 0 m A at 2 75V The LMX2305 is available in a TSSOP 20-pin surface mount plastic package Features RF operation up to 550 MHz 2 65V to 5 5V operation Low current consumption ICC e 4 0 m A (typ) at VCC e 2 75V Dual modulus prescaler 64 65 or 128 129 Internal balanced low leakage charge pump Small-outline plastic surface mount TSSOP 0 173 wide package Applications Analog Cellular telephone systems (AMPS ETACS NMT) Portable wireless munications (PCS PCN cordless) Wireless local area networks (WLANs) Other wireless munication systems Pagers Block Diagram TL W 12459 - 1 TRI-STATE is a registered trademark of National Semiconductor Corporation MICROWIRETM and PLLatinum TM are trademarks of National Semiconductor Corporation C1996 National Semiconductor Corporation TL W 12459 RRD-B30M126 Printed in U S A http national Connection Diagram TL W 12459 - 2 20-Lead (0 173 Wide) Thin Shrink Small Outline Package (TM) Order Number LMX2305TM or...