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參數資料
| 型號： | LMX2354TM/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 2500 MHz, PDSO24 |
| 封裝： | TSSOP-24 |
| 文件頁數： | 18/26頁 |
| 文件大小： | 453K |
| 代理商： | LMX2354TM/NOPB |
National P/N LMX2354 - 2.5 GHz/550 MHz PLLatinum Fractional N RF / Integer N IF Dual Low Power Frequency Synthesizer
LMX2354TMX
24 MSL
Full
production
N/A
1K+
$2.8000
reel
of
2500
[logo]UZ2TP
LMX2354
TMD
LMX2354SLBX
24 MSL
Full
production
N/A
N/A Samples
1K+
$2.8500
reel
of
2500
[logo]UZ2T
LMX2354
SLBD
LMX2354SLDX
24 MSL Preliminary
N/A
N/A Samples
reel
of
N/A
[logo]2T
X2354
SLDD
LMX2354SLEX
24 MSL Preliminary
N/A
N/A Samples
reel
of
N/A
[logo]2T
X2354
SLED
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 prescalers along with
modulo 15 or 16 fractional compensation circuitry in the RF divider. The LMX2354 provides a continuous
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 circuitry for the LMX2354 contains an 8/9 prescaler, and is fully
programmable. Using a fractional N phase locked loop technique, the LMX2354 can generate 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 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
q
Pin compatible/functional equivalent to the LMX2350
q
Enhanced Low Noise Fractional Engine
q
2.7V to 5.5V operation
q
Low current consumption LMX2354: ICC = 7 mA typical at 3V
q
Programmable or logical power down mode: ICC = 5 A typical at 3V
q
Modulo 15 or 16 fractional RF N divider supports ratios of 1, 2, 3, 4, 5, 8, 15, or 16
q
Programmable charge pump current levels RF 100 A to 1.6 mA in 100 A steps IF 100 A or 800 A
q
Digital filtered lock detect
q
Available in 24-pin TSSOP and 24-pin CSP
Applications
q
Portable wireless communications (PCS/PCN, cordless)
q
Dual mode cellular telephone systems
q
Zero blind slot TDMA systems
q
Spread spectrum communication systems (CDMA)
q
Cable TV Tuners (CATV)
Design Tools
file:///H|/imaging/BITTING/cpl/20020808_1/08062002_10/NATL/08062002_HTML/LMX2354.html (2 of 3) [09-Aug-2002 12:09:56 PM]
相關PDF資料 |
PDF描述 |
|---|---|
| LMX2354SLDX | PLL FREQUENCY SYNTHESIZER, 2500 MHz, CQCC24 |
| LMX2355SLBX | PLL FREQUENCY SYNTHESIZER, 2500 MHz, QCC24 |
| LMX2370SLDX | PLL FREQUENCY SYNTHESIZER, 2500 MHz, QCC24 |
| LMX2370TMX/NOPB | PLL FREQUENCY SYNTHESIZER, 2500 MHz, PDSO20 |
| LMX2370TM/NOPB | PLL FREQUENCY SYNTHESIZER, 2500 MHz, PDSO20 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LMX2354TMX/NOPB | 功能描述:IC FREQ SYNTH 2.5GHZ 24-TSSOP 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:* |
| LMX2355SLB | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum Fractional N RF/ Integer N IF Dual Low Power Frequency Synthesizer |
| LMX2355TM | 制造商:NSC 制造商全稱: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: |
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