參數(shù)資料
型號(hào)： LMX2355SLBX
廠(chǎng)商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： PLL合成/DDS/VCOs
英文描述： PLL FREQUENCY SYNTHESIZER, 2500 MHz, QCC24
封裝： PLASTIC, CSP-24
文件頁(yè)數(shù)： 1/23頁(yè)
文件大?。?/td> 403K
代理商： LMX2355SLBX
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 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
A 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 A 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 A to 1.6 mA in 100 A steps
IF 100 A or 800 A
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
LMX2354
PLLatinum
Fractional
N
RF/
Integer
N
IF
Dual
Low
Power
Frequency
Synthesizer
2001 National Semiconductor Corporation
DS200048
www.national.com
相關(guān)PDF資料
PDF描述
LMX2370SLDX PLL FREQUENCY SYNTHESIZER, 2500 MHz, QCC24
LMX2370TMX/NOPB PLL FREQUENCY SYNTHESIZER, 2500 MHz, PDSO20
LMX2370TM/NOPB PLL FREQUENCY SYNTHESIZER, 2500 MHz, PDSO20
LMX2512LQX0967/NOPB PLL FREQUENCY SYNTHESIZER, 19.68 MHz, QCC28
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LMX2355TM 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:PLLatinum Fractional N RF/ Integer N IF Dual Low Power Frequency Synthesizer
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(chēng):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(lèi)別:編程器，開(kāi)發(fā)系統(tǒng) >> 過(guò)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(lèi)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
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