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LTC1340CS8 PDF预览

LTC1340CS8

更新时间: 2024-02-26 01:16:48
品牌 Logo 应用领域
凌特 - Linear 驱动器二极管变容二极管电信集成电路电信电路光电二极管
页数 文件大小 规格书
8页 243K
描述
Low Noise, Voltage-Boosted Varactor Driver

LTC1340CS8 技术参数

是否Rohs认证: 不符合生命周期:Obsolete
零件包装代码:SOIC包装说明:0.150 INCH, PLASTIC, SOP-8
针数:8Reach Compliance Code:compliant
ECCN代码:EAR99HTS代码:8542.39.00.01
风险等级:5.92JESD-30 代码:R-PDSO-G8
JESD-609代码:e0长度:4.9 mm
功能数量:1端子数量:8
最高工作温度:70 °C最低工作温度:
封装主体材料:PLASTIC/EPOXY封装代码:SOP
封装形状:RECTANGULAR封装形式:SMALL OUTLINE
认证状态:Not Qualified座面最大高度:1.75 mm
最大压摆率:0.9 mA标称供电电压:3 V
表面贴装:YES电信集成电路类型:TELECOM CIRCUIT
温度等级:COMMERCIAL端子面层:Tin/Lead (Sn/Pb)
端子形式:GULL WING端子节距:1.27 mm
端子位置:DUAL宽度:3.9 mm
Base Number Matches:1

LTC1340CS8 数据手册

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LTC1340  
Low Noise, Voltage-Boosted  
Varactor Driver  
U
FEATURES  
DESCRIPTION  
TheLTC®1340isavaractordiodedriverdesignedtogenerate  
5V varactor drive from a single 3V or higher voltage supply.  
It includes a low noise amplifier with an internal gain of 2.3  
and a self-contained charge pump to generate output volt-  
ages above the input supply. The amplifier input stage  
includesabuilt-inoffsetvoltagethatallowstheoutputvoltage  
to swing to ground without requiring OV on the input. This  
featuremaintains thephasedetectorwithinits linearrangeof  
operation. The LTC1340 requires only three external surface  
mount capacitors to implement a complete varactor driver  
module.  
Generates 5V Varactor Drive from a 3V Supply  
Wide Supply Voltage Range: 2.7V to 6V  
Requires Only Three External Components  
Micropower Operation: 400µA at 3V Supply  
Shutdown Mode Drops Supply Current Below 1µA  
Low Output Noise: 15µVRMS  
Amplifier Gain: 2.3  
Up to 500kHz Signal Bandwidth  
MS8 and SO-8 Packages  
Very Low Input Bias Current: 10nA Max  
Amplifier Offset Maintains Phase Detector  
in Linear Region  
The LTC1340 features output referred noise of 15µVRMS  
,
minimizing frequency deviation in PLL frequency synthe-  
sizer systems. Supply current is 400µA typically with a 3V  
supply,anddropsto1µAinshutdown,maximizingoperating  
lifeinbattery-poweredsystems.Amplifierbandwidthisuser-  
adjustable from 10kHz up to 500kHz and the output typically  
sinks or sources 20µA, allowing fast output signal changes  
with a typical varactor load. The amplifier input features rail-  
to-rail input common mode range, allowing it  
to interface with the output of virtually any phase detector  
circuit.  
U
APPLICATIONS  
5V Varactor Drive from a Single Li-Ion Cell  
5V Varactor Drive from Three NiCd/NiMH Cells  
Cellular Telephones  
Portable RF Equipment  
Radio Modems  
Wireless Data Transmission  
The LTC1340 is available in MS8 and SO-8 packages.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATION  
Spectral Plot of VCO Output Driven by LTC1340  
Resolution Bandwidth = 300Hz  
Low Voltage Frequency Synthesizer  
3V  
0dB  
1
8
2
0.1µF  
0.1µF  
V
CC  
CP  
LTC1340  
AV  
CC  
VCO  
0V TO 5V  
OUT  
7
5
IN  
PHASE  
DETECTOR  
A
V
= 2.3  
270pF  
LOOP  
FILTER  
SHDN PGND AGND  
4
3
6
1340 TA01  
SHUTDOWN  
900MHz  
FREQUENCY (120kHz/DIV)  
1340 TA02  
1

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