LMX2335 Datasheet | National Semiconductor

Features n 2.7V to 5.5V operation n Low current consumption n Selectable powerdown mode: ICC = 1 µA (typ) n Dual modulus prescaler: 64/65 or 128/129 n Selectable charge pump TRI-STATE ® mode n Selectable charge pump current levels n Selectable Fast Lock™ mode General Description The LMX2335, LMX2336 and LMX2337 are monolithic, integrated dual frequency synthesizers, including two high frequency prescalers, and are designed for applications requiring two RF phase-lock loops. They are fabricated using National’s ABi C IV silicon Bi CMOS process. The LMX2335/36/37 contains two dual modulus prescalers. A 64/65 or a 128/129 prescaler can be selected for each RF synthesizer. A second reference divider chain is included in the IC for improved system noise. LMX2335/36/37, which employ a digital phase locked loop technique, bined with a high quality reference oscillator and loop filters, provide the tuning voltages for voltage controlled oscillators to generate very stable low noise RF local oscillator signals. Serial data is transferred into the LMX2335/36/37 via a three wire interface (Data, Enable, Clock). Supply voltage can range from 2.7V to 5.5V. The LMX2335/36/37 feature very low current consumption; LMX2335/37 - 10 m A at 3V, LMX2336 - 13 m A at 3V. The LMX2335/37 are available in Applications n Cellular telephone systems (AMPS, ETACS, RCR-27) n Cordless telephone systems (DECT, ISM, PHS, CT-1+) n Personal munication Systems (DCS-1800, PCN-1900) n Dual Mode PCS phones n CATV n Other wireless munication systems Functional Block Diagram DS012332-1 TRI-STATE ® is a registered trademark of National Semiconductor Corporation. Fastlock™, MICROWIRE™ and PLLatinum™ are trademarks of National Semiconductor Corporation. © 1999 National Semiconductor Corporation DS012332 .national. Connection Diagrams LMX2335/LMX2337 LMX2336 DS012332-2 Order Number LMX2335M/LMX2335TM or LMX2337M/LMX2337TM NS Package Number M16A and MTC16 DS012332-16 Order Number LMX2336TM NS Package...