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LMX2525LQ1321 PDF预览

LMX2525LQ1321

更新时间： 2024-09-22 22:18:27
品牌 Logo 应用领域
美国国家半导体 - NSC 半导体
页数 文件大小 规格书
17页 235K
描述
PLLatinum Dual Frequency Synthesizer System with Integrated VCOs

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LMX2525LQ1321 数据手册

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April 2004  
LMX2525  
™
PLLatinum Dual Frequency Synthesizer System  
with Integrated VCOs  
General Description  
Features  
n Small Size  
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.  
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  
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.  
n Low Current Consumption  
10 mA at 2.8 V in PDC800 Mode  
n 2.5 V to 3.3 V Operation  
Serial data is transferred to the device via a three-wire  
MICROWIRE interface (DATA, LE, CLK).  
n Digital Filtered Lock Detect Output  
n Hardware and Software Power Down Control  
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).  
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.  
© 2004 National Semiconductor Corporation  
DS200689  
www.national.com  
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