Datasheet > LTC1340

LTC1340

更新时间： 2024-01-02 08:18:13

品牌	Logo	应用领域
凌特 - Linear		驱动器二极管变容二极管
页数	文件大小	规格书
8页	243K
描述
Low Noise, Voltage-Boosted Varactor Driver

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中文翻译

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数据手册

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LTC1340 数据手册

LTC1340

Low Noise, Voltage-Boosted

Varactor Driver

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: 15µV_RMS

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 15µV_RMS

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.

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.

TYPICAL APPLICATION

Spectral Plot of VCO Output Driven by LTC1340

Resolution Bandwidth = 300Hz

Low Voltage Frequency Synthesizer

0dB

= 3V

OUT

= 270pF

0.1µF

LTC1340

VCO

0V TO 5V

OUT

PHASE

DETECTOR

= 2.3

270pF

LOOP

FILTER

SHDN PGND AGND

1340 TA01

SHUTDOWN

900MHz

FREQUENCY (120kHz/DIV)

1340 TA02

12 3 4 5 6 7 8

中文翻译

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与LTC1340相关器件

型号	品牌	获取价格	描述	数据表
LTC1340CMS8	Linear	获取价格	Low Noise, Voltage-Boosted Varactor Driver
LTC1340CS8	Linear	获取价格	Low Noise, Voltage-Boosted Varactor Driver
LTC1340CS8#TR	Linear	获取价格	IC SPECIALTY TELECOM CIRCUIT, PDSO8, 0.150 INCH, PLASTIC, SOP-8, Telecom IC:Other
LTC1343	Linear	获取价格	Software-Selectable Multiprotocol Transceiver
LTC1343	ADI	获取价格	软件可选的多协议收发器
LTC1343C	Linear	获取价格	Software-Selectable Multiprotocol Transceiver
LTC1343CGW	Linear	获取价格	Software-Selectable Multiprotocol Transceiver
LTC1343CGW#PBF	Linear	获取价格	LTC1343 - Software-Selectable Multiprotocol Transceiver; Package: SSOP; Pins: 44; Temperat
LTC1343CGW#TR	Linear	获取价格	LTC1343 - Software-Selectable Multiprotocol Transceiver; Package: SSOP; Pins: 44; Temperat
LTC1343CGW#TRPBF	Linear	获取价格	LTC1343 - Software-Selectable Multiprotocol Transceiver; Package: SSOP; Pins: 44; Temperat

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