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1 / 16 page LMX2370/LMX2371/LMX2372 PLLatinum™ Dual Frequency Synthesizer for RF Personal Communications LMX2370 2.5 GHz/1.2 GHz LMX2371 2.0 GHz/1.2 GHz LMX2372 1.2 GHz/1.2 GHz General Description The LMX237X family of monolithic, integrated dual fre- quency synthesizers, including prescalers, is designed to be used as a first and second local oscillator for dual mode or dual conversion transceivers. It is fabricated using National’s 0.5u ABiCV silicon BiCMOS process. The LMX237X con- tains two dual modulus prescalers. A 32/33 or a 16/17 prescaler can be selected for the 2.5 GHz and 2.0 GHz RF synthesizers with the 16/17 prescaler rated for input frequen- cies below 1.2 GHz. A 16/17 or an 8/9 prescaler can be se- lected for the 1.2 GHz RF synthesizers with the 8/9 prescaler rated for input frequencies below 550 MHz. Using a digital phase locked loop technique, the LMX237X can generate very stable, low noise control signals for UHF and VHF volt- age controlled oscillators (VCO’s). Serial data is transferred into the LMX237X via a 1.8V three wire interface (Data, En- able, Clock) compatible with low voltage baseband proces- sors. Supply voltage can range from 2.7V to 5.5V. The LMX237X family features very low current consumption typi- cally: LMX2370 - 6.0 mA @ 3V, LMX2371 - 5.0 mA @ 3V, LMX2372 - 4.0 mA @ 3V. The LMX237X are available in a 24-pad chip scale (CSP) or a 20-pin TSSOP surface mount plastic package. Features n 2.7V–5.5V operation n Ultra low current consumption n Low phase detector noise floor n Low voltage MICROWIRE™ interface (1.8V up to VCC) n Low prescaler values 32/33 @ f IN ≤ 2.5 GHz 16/17 @ f IN ≤ 1.2 GHz 8/9 @ f IN ≤ 550 MHz n Selectable charge pump current levels n Selectable FastLock™ mode n Enhanced ESD protection n Small 24 pad chip scale package (3.5 x 4.5 x 1.0 mm) Applications n Portable wireless communications (PCS/PCN, cordless) n Dual mode cellular telephone systems n Spread spectrum communication systems (CDMA) n Cable TV tuners (CATV) Functional Block Diagram FastLock™, PLLatinum™ and MICROWIRE™ are trademarks of National Semiconductor Corporation. TRI-STATE® is a registered trademark of National Semiconductor Corporation. DS101026-1 PRELIMINARY March 1999 © 1999 National Semiconductor Corporation DS101026 www.national.com |
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