LMX2336L

LMX2335L/LMX2336L PLLatinum Low Power Dual Frequency Synthesizer for RF Personal Communications PRELIMINARY June 1999 LMX2335L/LMX2336L PLLatinum™ Low Power Dual Frequency Synthesizer for RF Personal Communications LMX2335L LMX2336L 1.1 GHz/1.1 GHz 2.0 GHz/1.1 GHz Features n Ultra low current consumption n 2.7V to 5.5V operation n Selectable synchronous and asynchronous 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 Fastlock™ mode n Upgrade and compatible to LMX2335/36 n Small-outline, plastic, surface mount TSSOP package n LMX2336 available in CSP package General Description The LMX2335L and LMX2336L 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 0.5µ ABiC V silicon BiCMOS process. The LMX2335L/36L 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. The LMX2335L/36L combined with a high quality reference oscillator, two loop filters, and two external voltage controlled oscillators generates very stable low noise RF local oscillator signals. Serial data is transferred into the LMX2335L/36L via a three wire interface (Data, Enable, Clock). Supply voltage can ra...