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LMX2525 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LMX2525 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 17 page  LMX2525 PLLatinum™ Dual Frequency Synthesizer System with Integrated VCOs General Description LMX2525 is a highly integrated, high performance, low power frequency synthesizer system optimized for dual- band Japan PDC mobile handsets. Using a proprietary digi- tal phase locked loop technique, LMX2525 generates very stable, low noise local oscillator signals for up and down conversion in wireless communications devices. LMX2525 includes dual voltage controlled oscillators (VCOs) for the upper and lower Japan PDC frequency bands, a loop filter, and a fractional-N RF PLL based on a delta sigma modulator. In concert, these blocks form a closed loop RF synthesizer system. The RF synthesizer system supports two frequency bands: PDC1500 and PDC800. Serial data is transferred to the device via a three-wire MICROWIRE interface (DATA, LE, CLK). Operating supply voltage ranges from 2.5 V to 3.3 V. LMX2525 features low current consumption: 10 mA at 2.8 V when operating in the PDC800 mode. LMX2525 is available in a 24-pin leadless leadframe pack- age (LLP). Features n Small Size 5.0 mm X 4.0 mm X 0.75 mm 24-Pin LLP Package n RF Synthesizer System Two Integrated VCOs Integrated Loop Filter Low Spurious, Low Phase Noise Fractional-N RF PLL Based on 10-Bit Delta Sigma Modulator Frequency Resolution Down to 20 kHz n Supports Various Reference Frequencies 12.6 MHz, 14.4 MHz, 25.2MHz, and 26.0 MHz n Fast Lock Time: 300 µs n Low Current Consumption 10 mA at 2.8 V in PDC800 Mode n 2.5 V to 3.3 V Operation n Digital Filtered Lock Detect Output n Hardware and Software Power Down Control Applications n Japan PDC Systems at 800 MHz and 1500 MHz Frequency Bands. Functional Block Diagram 20068907 FastLock™ is a trademark of National Semiconductor Corporation. TRI-STATE® is a registered trademark of National Semiconductor Corporation. PLLatinum™ is a trademark of National Semiconductor Corporation. April 2004 © 2004 National Semiconductor Corporation DS200689 www.national.com |
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