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參數資料
| 型號： | LMX2502LQX1635/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 19.68 MHz, QCC28 |
| 封裝： | 5 X 5 MM, 0.75 MM HEIGHT, LLP-28 |
| 文件頁數： | 1/18頁 |
| 文件大小： | 184K |
| 代理商： | LMX2502LQX1635/NOPB |
LMX2502/LMX2512
PLLatinum Frequency Synthesizer System with
Integrated VCO
General Description
LMX2502 and LMX2512 are highly integrated, high perfor-
mance, low power frequency synthesizer systems optimized
for Korean PCS and Korean Cellular CDMA (1xRTT, IS-95)
mobile handsets. Using a proprietary digital phase locked
loop technique, LMX2502 and LMX2512 generate very
stable, low noise local oscillator signals for up and down
conversion in wireless communications devices.
LMX2502 and LMX2512 include a voltage controlled oscil-
lator (VCO), 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. LMX2502 supports the
Korean PCS band and LMX2512 supports the Korean Cel-
lular band.
LMX2502 and LMX2512 include an Integer-N IF PLL also.
For more flexible loop filter designs, the IF PLL includes a
4-level programmable charge pump. Together with an exter-
nal VCO and loop filter, LMX2502 and LMX2512 make a
complete closed loop IF synthesizer system.
Serial data is transferred to the device via a three-wire
MICROWIRE interface (DATA, LE, CLK).
Operating supply voltage ranges from 2.7 V to 3.3 V.
LMX2502 and LMX2512 feature low current consumption:
17 mA at 2.8 V.
LMX2502 and LMX2512 are available in a 28-pin leadless
leadframe package (LLP).
Features
n
Small Size
5.0 mm X 5.0 mm X 0.75 mm 28-Pin LLP Package
n
RF Synthesizer System
Integrated RF VCO
Integrated Loop Filter
Low Spurious, Low Phase Noise Fractional-N RF PLL
Based on 11-Bit Delta Sigma Modulator
10 kHz Frequency Resolution
n
IF Synthesizer System
Integer-N IF PLL
Programmable Charge Pump Current Levels
Programmable Frequency
n
Supports Various Reference Frequencies
19.20/19.68 MHz
n
Fast Lock Time: 500 s
n
Low Current Consumption
17 mA at 2.8 V
n
2.7 V to 3.3 V Operation
n
Digital Filtered Lock Detect Output
n
Hardware and Software Power Down Control
Applications
n
Korean PCS CDMA Systems
n
Korean Cellular CDMA Systems
Functional Block Diagram
20068001
PLLatinum is a trademark of National Semiconductor Corporation.
June 2003
LMX2502/LMX2512
Frequency
Synthesizer
System
with
Integrated
VCO
2003 National Semiconductor Corporation
DS200680
www.national.com
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LMX2505 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinu Dual Frequency Synthesizer System with Integrated VCOs |
| LMX25051321EVAL/NOPB | 功能描述:EVALUATION BOARD FOR LMX25051321 RoHS:是 類別:編程器，開發系統 >> 評估演示板和套件 系列:PLLatinum™ 標準包裝:1 系列:PCI Express® (PCIe) 主要目的:接口，收發器，PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要屬性:- 次要屬性:- 已供物品:板 |
| LMX2505LQ1321 | 制造商:Texas Instruments 功能描述:PLL VCO CDMA SMD 2505 LLP-28 |
| LMX2505LQ1321/NOPB | 功能描述:IC FREQ SYNTH DUAL W/VCO 28LLP RoHS:是 類別:RF/IF 和 RFID >> RF 其它 IC 和模塊 系列:PLLatinum™ 標準包裝:100 系列:* |
| LMX2505LQX1321 | 功能描述:IC SYNTHESIZER PLL VCO 28-LLP RoHS:是 類別:RF/IF 和 RFID >> RF 其它 IC 和模塊 系列:PLLatinum™ 標準包裝:100 系列:* |
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