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參數資料
| 型號： | LMX2352TM/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 1200 MHz, PDSO24 |
| 封裝： | PLASTIC, TSSOP-24 |
| 文件頁數： | 1/21頁 |
| 文件大小： | 405K |
| 代理商： | LMX2352TM/NOPB |
LMX2350/LMX2352
PLLatinum Fractional N RF / Integer N IF
Dual Low Power Frequency Synthesizer
LMX2350 2.5 GHz/550 MHz
LMX2352 1.2 GHz/550 MHz
General Description
The LMX2350/2352 is part of a family of monolithic inte-
grated fractional N/ Integer N frequency synthesizers de-
signed to be used in a local oscillator subsystem for a radio
transceiver. It is fabricated using National’s 0.5 ABiC V
silicon BiCMOS process. The LMX2350/2352 contains dual
modulus prescalers along with modulo 15 or 16 fractional
compensation circuitry in the RF divider. A 16/17 or 32/33
prescale ratio can be selected for the LMX2350, and the
LMX2352 provides 8/9 or 16/17 prescale ratios. The IF
circuitry for both the LMX2350 and LMX2352 contains an 8/9
prescaler, and is fully programmable. Using a fractional N
phase locked loop technique, the LMX2350 /52 can gener-
ate very stable low noise control signals for UHF and VHF
voltage controlled oscillators (VCOs).
For the RF PLL, a highly flexible 16 level programmable
charge pump supplies output current magnitudes from
100A to 1.6mA. Two uncommitted CMOS outputs can be
used to provide external control signals, or configured to
FastLock mode. Serial data is transferred into the
LMX2350/2352 via a three wire interface (Data, LE, Clock).
Supply voltage can range from 2.7 V to 5.5 V. The LMX2350/
LMX2352 family features very low current consumption; typi-
cally LMX2350 (2.5 GHz) 6.5 mA, LMX2352 (1.2 GHz) 4.75
mA at 3.0V. The LMX2350/2352 are available in a 24-pin
TSSOP and 24-pin CSP surface mount plastic package.
Features
n
2.7 V to 5.5 V operation
n
Low current consumption
LMX2350: Icc = 6.75mA typ at 3v
LMX2352: Icc = 5.00mA typ at 3v
n
Programmable or logical power down mode
Icc=5A typ at 3v
n
Modulo 15 or 16 fractional RF N divider supports ratios
of 1, 2, 3, 4, 5, 8, 15, or 16
n
Programmable charge pump current levels
RF 100A to 1.6mA in 100A steps
IF 100A or 800 A
n
Digital filtered lock detect
Applications
n
Portable wireless communications (PCS/PCN, cordless)
n
Dual mode cellular telephone systems
n
Zero blind slot TDMA systems
n
Spread spectrum communication systems (CDMA)
n
Cable TV Tuners (CATV)
Block Diagram
DS100831-1
March 2001
LMX2350/LMX2352
PLLatinum
Fractional
N
R
F
/
Integer
N
IF
Dual
Low
Power
Frequency
Synthesizer
2001 National Semiconductor Corporation
DS100831
www.national.com
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LMX2352TMX | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Serial-Input Frequency Synthesizer |
| LMX2352TMX/NOPB | 功能描述:IC FREQUENCY SYNTHESIZER 24TSSOP RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發生器，PLL，頻率合成器 系列:PLLatinum™ 標準包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時鐘 輸出:時鐘 電路數: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:* 供應商設備封裝:* 包裝:* |
| LMX2353 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum⑩ Fractional N Single 2.5 GHz Frequency Synthesizer |
| LMX2353SLBX | 功能描述:IC FREQ SYNTH 2.5GHZ 16LAMCSP RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發生器，PLL，頻率合成器 系列:PLLatinum™ 標準包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時鐘 輸出:時鐘 電路數: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:* 供應商設備封裝:* 包裝:* |
| LMX2353TM | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum⑩ Fractional N Single 2.5 GHz Frequency Synthesizer |
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