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參數(shù)資料
| 型號： | LMX2542 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | PLLatinum Cellular and GPS Frequency Synthesizer System with Integrated VCO |
| 中文描述： | PLLatinum蜂窩頻率合成器和GPS系統(tǒng)的集成VCO |
| 文件頁數(shù)： | 1/22頁 |
| 文件大小： | 253K |
| 代理商： | LMX2542 |
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
L
2004 National Semiconductor Corporation
DS200824
www.national.com
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| LMX2542LQ2121 | 制造商:Texas Instruments 功能描述:IC PLL + VCO SMD 2542 LLP-28 |
| LMX2542LQ2121/NOPB | 功能描述:IC FREQ SYNTH CELL/GPS 28-LLP RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:PLLatinum™ 標(biāo)準(zhǔn)包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時鐘 輸出:時鐘 電路數(shù):1 比率 - 輸入:輸出:1:10 差分 - 輸入:輸出:是/是 頻率 - 最大:170MHz 除法器/乘法器:無/無 電源電壓:2.375 V ~ 3.465 V 工作溫度:0°C ~ 70°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* |
| LMX2542LQX2121 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum Cellular and GPS Frequency Synthesizer System with Integrated VCO |
| LMX2571EVM | 功能描述:LMX2571 PLLatinum? Series Timing, Frequency Synthesizer Evaluation Board 制造商:texas instruments 系列:PLLatinum?? 零件狀態(tài):有效 主要用途:計時，頻率合成器 嵌入式:- 使用的 IC/零件:LMX2571 主要屬性:帶 VCO 的單路分?jǐn)?shù)-N PLL 輔助屬性:SMA 連接器 所含物品:板 標(biāo)準(zhǔn)包裝:1 |
| LMX2571NJKT | 功能描述:IC FREQ SYNTHESIZER VCO 制造商:texas instruments 系列:PLLatinum?? 包裝:剪切帶（CT） 零件狀態(tài):有效 類型:頻率合成器（RF） PLL:帶旁路 輸入:時鐘，晶體 輸出:時鐘 電路數(shù):1 比率 - 輸入:輸出:2:2 差分 - 輸入:輸出:是/無 頻率 - 最大值:1.4GHz 分頻器/倍頻器:是/是 電壓 - 電源:3.15 V ~ 3.45 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:36-WFQFN 裸露焊盤 供應(yīng)商器件封裝:36-WQFN（6x6） 標(biāo)準(zhǔn)包裝:1 |
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