LMX2310U Datasheet | National Semiconductor

Description The LMX2310/1/2/3U are high performance frequency synthesizers. The LMX2310/1/2U use a selectable, dual modulus 32/33 and 16/17 prescaler. The LMX2313U uses a selectable, dual modulus 16/17 and 8/9 prescaler. The device, when bined with a high quality reference oscillator and a voltage controlled oscillator, generates very stable, low noise local oscillator signals for up and down conversion in wireless munication devices. Serial data is transferred into LMX2310/1/2/3U via a threewire interface (Data, Enable, Clock) that can be directly interfaced with low voltage baseband processors. Supply voltage can range from 2.7V to 5.5V. LMX2310U features very low current consumption, typically 2.3 m A at 3.0V. The LMX2310/1/2/3U are manufactured using National’s 0.5µ ABi C V silicon Bi CMOS process and is available in 20-pin CSP packages. Features n n n n RF operation up to 2.5 GHz 2.7V to 5.5V operation Ultra Low Current Consumption Low prescaler values LMX2310/1/2U 32/33 or 16/17 LMX2313U 16/17 or 8/9 Excellent Phase Noise Internal balanced, low leakage charge pump Selectable Charge Pump Current Levels Selectable Fastlock mode with Time-Out Counter Low Voltage MICROWIRE interface (1.72V to VCC) Digital and Analog Lock Detect Small 20-pad Thin Chip Scale Package n n n n n n n Applications n n n n Cellular DCS, PCS, WCDMA telephone systems Wireless Local Area Networks (WLAN) Global Positioning Systems (GPS) Other wireless munications systems Functional Block Diagram PLLatinum™ is a trademark of National Semiconductor Corporation. © 2003 National Semiconductor Corporation DS200438 .national. LMX2310U/LMX2311U/LMX2312U/LMX2313U Connection Diagram 20-Pin Thin Chip Scale Package NS Package Number SLD20A .national. LMX2310U/LMX2311U/LMX2312U/LMX2313U Pin Descriptions Pin Number 1 2 Pin Name NC CPo I/O - No Connect. O Charge Pump output. For connection to a loop filter for driving the voltage control input of an external VCO....