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LMX2542 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LMX2542 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 22 page  LMX2542 PLLatinum TM Cellular and GPS Frequency Synthesizer System with Integrated VCO General Description LMX2542 is a highly integrated, high performance, low power frequency synthesizer system optimized for Cellular- CDMA 1xRTT and IS-95 mobile handsets and data systems with GPS capabilities. Using a proprietary digital phase locked loop technique, LMX2542 provides very stable, low noise local oscillator (LO) signals for up and down conver- sion in wireless communications devices. LMX2542 includes a Voltage Controlled Oscillator (VCO) for both the Cellular-CDMA and GPS frequency bands, a loop filter, and a Fractional-N RF PLL based on a Delta Sigma ( ∆Σ) modulator. In concert, these blocks form a closed loop RF synthesizer system. The RF synthesizer system oper- ates from 2087.73 MHz to 2155.14 MHz. LMX2542 includes an Integer-N IF PLL also. For more flex- ible loop filter designs, the IF PLL includes a 4-level pro- grammable charge pump. Together with an external VCO and loop filter, LMX2542 makes a complete closed loop IF synthesizer system. The default IF frequency is 367.20 MHz. Serial data is transferred to the device via a three-wire MICROWIRE TM interface (DATA, LE, CLK). Operating supply voltage ranges from 2.7V to 3.3V. LMX2542 features low current consumption: 22 mA at 2.8V. LMX2542 is available in a 28-Pin Leadless Leadframe Pack- age (LLP). Features n Small Size 5.0 mm x 5.0 mm x 0.75 mm 28-Pin LLP n RF Synthesizer System Integrated RF VCO Integrated Loop Filter Low Spurious, Low Phase Noise Fractional-N RF PLL Based on 11-Bit ∆Σ modulator 5 kHz Frequency Resolution Cellular-CDMA LO: 2105.28 MHz to 2155.14 MHz (Requires an External LO /2 Circuit) GPS LO: 2087.73 MHz (Requires an External LO /1.5 Circuit) n IF Synthesizer System Integer-N IF PLL Programmable Charge Pump Current Levels IF LO: 367.20 MHz n Supports Various Reference Oscillator Frequencies: 19.20 MHz/ 19.68 MHz n Low Current Consumption: 22 mA typical at 2.8V n 2.7V to 3.3V Operation n RF Digital Filtered Lock Detect Output n Hardware and Software Powerdown Control Applications n Cellular-CDMA 1xRTT and IS-95 Mobile Handsets with GPS n Cellular-CDMA 1xRTT and IS-95 Mobile Data Systems with GPS Leadless Leadframe Package (LQA28A) 20082411 PLLatinum™, MICROWIRE™ are trademarks of National Semiconductor Corporation. TRI-STATE® is a registered trademark of National Semiconductor Corporation. May 2004 © 2004 National Semiconductor Corporation DS200824 www.national.com |
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