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LMX2335L Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LMX2335L Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 22 page LMX2335L/LMX2336L PLLatinum™ Low Power Dual Frequency Synthesizer for RF Personal Communications LMX2335L 1.1 GHz/1.1 GHz LMX2336L 2.0 GHz/1.1 GHz 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 com- bined 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 range from 2.7V to 5.5V. The LMX2335L/36L feature very low current consumption; LMX2335L 4.0 mA at 5V, LMX2336L 5.5 mA at 5V. The LMX2335L is available in SO, TSSOP and CSP 16-pin surface mount plastic packages. The LMX2336L is available in a TSSOP 20-pin and CSP 24-pin surface mount plastic package. Features n Ultra low current consumption n 2.7V to 5.5V operation n Selectable synchronous and asynchronous powerdown mode: I CC = 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 Applications n Cellular telephone systems (AMPS, ETACS, RCR-27) n Cordless telephone systems (DECT, ISM , PHS, CT-1+) n Personal Communication Systems (DCS-1800, PCN-1900) n Dual Mode PCS phones n Cable TV Tuners (CATV) n Other wireless communication systems Functional Block Diagram TRI-STATE® is a registered trademark of National Semiconductor Corporation. Fastlock™, MICROWIRE™ and PLLatinum™ are trademarks of National Semiconductor Corporation. DS012807-1 PRELIMINARY June 1999 © 1999 National Semiconductor Corporation DS012807 www.national.com |
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