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參數(shù)資料
| 型號(hào)： | LMX2355TM |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | XO, clock |
| 英文描述： | PLLatinum Fractional N RF/ Integer N IF Dual Low Power Frequency Synthesizer |
| 中文描述： | PLL FREQUENCY SYNTHESIZER, 2500 MHz, PDSO24 |
| 封裝： | TSSOP-24 |
| 文件頁數(shù)： | 1/23頁 |
| 文件大?。?/td> | 403K |
| 代理商： | LMX2355TM |
LMX2354
PLLatinum Fractional N RF/ Integer N IF Dual Low Power
Frequency Synthesizer
LMX2354 2.5 GHz/550 MHz
General Description
The LMX2354 is part of a family of monolithic integrated
fractional N/Integer N frequency synthesizers designed to be
used in a local oscillator subsystem for a radio transceiver. It
is fabricated using National’s 0.5 μ ABiC V silicon BiCMOS
process. The LMX2354 contains quadruple modulus pres-
calers along with modulo 15 or 16 fractional compensation
circuitry in the RF divider. The LMX2354 provides a continu-
ous
divide
ratio
of
80
to
32767
in
16/17/20/21
(1.2 GHz–2.5 GHz) fractional mode and 40 to 16383 in
8/9/12/13 (550 MHz–1.2 GHz) fractional mode. The IF cir-
cuitry for the LMX2354 contains an 8/9 prescaler, and is fully
programmable. Using a fractional N phase locked loop tech-
nique, the LMX2354 can generate very stable low noise
control signals for UHF and VHF voltage controlled oscilla-
tors (VCOs).
For the RF PLL, a highly flexible 16 level programmable
charge pump supplies output current magnitudes from 100
μA to 1.6 mA. Two uncommitted CMOS outputs can be used
to provide external control signals, or configured to FastLock
mode. Serial data is transferred into the LMX2354 via a three
wire interface (Data, LE, Clock). Supply voltage can range
from 2.7V to 5.5V. The LMX2354 family features very low
current consumption; typically LMX2354 (2.5 GHz) — 7.0
mA. The LMX2354 are available in a 24-pin TSSOP surface
mount plastic package and 24-pin CSP.
Features
n
Pin compatible/functional equivalent to the LMX2350
n
Enhanced Low Noise Fractional Engine
n
2.7V to 5.5V operation
n
Low current consumption
LMX2354: I
CC
= 7 mA typical at 3V
n
Programmable or logical power down mode:
I
CC
= 5 μA typical 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 100 μA to 1.6 mA in 100 μA steps
IF 100 μA or 800 μA
n
Digital filtered lock detect
n
Available in 24-pin TSSOP and 24-pin CSP
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)
Functional Block Diagram
20004801
August 2001
L
2001 National Semiconductor Corporation
DS200048
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMX2360 WAF | 制造商:Texas Instruments 功能描述: |
| LMX2360TMX | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述: |
| LMX2364 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:2.6 GHz PLLatinum Fractional RF Frequency Synthesizer with 850 MHz Integer IF Frequency Synthesizer |
| LMX2364EVAL | 功能描述:BOARD EVALUATION LMX2364 RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 過時(shí)/停產(chǎn)零件編號(hào) 系列:PLLatinum™ 標(biāo)準(zhǔn)包裝:1 系列:- 傳感器類型:CMOS 成像，彩色（RGB） 傳感范圍:WVGA 接口:I²C 靈敏度:60 fps 電源電壓:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相關(guān)產(chǎn)品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
| LMX2364SLEX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:2.6 GHz PLLatinum Fractional RF Frequency Synthesizer with 850 MHz Integer IF Frequency Synthesizer |
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