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参数资料
| 型号： | LMX2354TM/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 2500 MHz, PDSO24 |
| 封装： | TSSOP-24 |
| 文件页数： | 1/26页 |
| 文件大小： | 453K |
| 代理商： | LMX2354TM/NOPB |
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
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| 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 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LMX2354TMX/NOPB | 功能描述:IC FREQ SYNTH 2.5GHZ 24-TSSOP RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 时钟发生器，PLL，频率合成器 系列:PLLatinum™ 标准包装:39 系列:- 类型:* PLL:带旁路 输入:时钟 输出:时钟 电路数:1 比率 - 输入:输出:1:10 差分 - 输入:输出:是/是 频率 - 最大:170MHz 除法器/乘法器:无/无 电源电压:2.375 V ~ 3.465 V 工作温度:0°C ~ 70°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| LMX2355SLB | 制造商:NSC 制造商全称:National Semiconductor 功能描述:PLLatinum Fractional N RF/ Integer N IF Dual Low Power Frequency Synthesizer |
| LMX2355TM | 制造商:NSC 制造商全称: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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