Part # LMX2525 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LMX2525 PLLatinum™ Dual Frequency Synthesizer System with Integrated VCOs


Part Details:

LMX2525 April 2004 LMX2525 PLLatinum PLLatinumTM Dual Frequency Synthesizer Systemwith Integrated VCOsGeneral Description Features LMX2525 is a highly integrated, high performance, low n Small Size Dual power frequency synthesizer system optimized for dual- 5.0 mm X 4.0 mm X 0.75 mm 24-Pin LLP Package band Japan PDC mobile handsets. Using a proprietary digi- n RF Synthesizer System tal phase locked loop technique, LMX2525 generates very Two Integrated VCOs stable, low noise local oscillator signals for up and down Integrated Loop Filter Frequency conversion in wireless communications devices. Low Spurious, Low Phase Noise Fractional-N RF PLL LMX2525 includes dual voltage controlled oscillators (VCOs) Based on 10-Bit Delta Sigma Modulator for the upper and lower Japan PDC frequency bands, a loop Frequency Resolution Down to 20 kHz filter, and a fractional-N RF PLL based on a delta sigma n Supports Various Reference Frequencies modulator. In concert, these blocks form a closed loop RF 12.6 MHz, 14.4 MHz, 25.2MHz, and 26.0 MHz synthesizer system. The RF synthesizer system supports n Fast Lock Time: 300 µs two frequency bands: PDC1500 and PDC800. n Low Current Consumption Synthesizer Serial data is transferred to the device via a three-wire 10 mA at 2.8 V in PDC800 Mode MICROWIRE interface (DATA, LE, CLK). n 2.5 V to 3.3 V Operation Operating supply voltage ranges from 2.5 V to 3.3 V. n Digital Filtered Lock Detect Output LMX2525 features low current consumption: 10 mA at 2.8 V n Hardware and Software Power Down Control when operating in the PDC800 mode. LMX2525 is available in a 24-pin leadless leadframe pack- Applications age (LLP). n Japan PDC Systems at 800 MHz and 1500 MHz Frequency Bands. System Functional Block Diagram with Integrated VCOs 20068907 FastLockTM is a trademark of National Semiconductor Corporation.TRI-STATE® is a registered trademark of National Semiconductor Corporation.PLLatinumTM is a trademark of National Semiconductor Corporation. © 2004 National Semiconductor Corporation


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LMX2525.pdf Datasheet