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LT5503EFE-PBF

更新时间： 2024-09-30 05:43:35

品牌	Logo	应用领域
凌特 - Linear		/
页数	文件大小	规格书
20页	216K
描述
1.2GHz to 2.7GHz Direct IQ Modulator and Mixer

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中文翻译

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数据手册

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LT5503EFE-PBF 数据手册

LT5503

1.2GHz to 2.7GHz Direct

IQ Modulator and Mixer

DESCRIPTIO

FEATURES

TheLT^®5503isafront-endtransmitterICdesignedforlow

voltageoperation.TheICcontainsahighfrequencyquadra-

ture modulator with a variable gain amplifier (VGA) and a

balanced mixer. The modulator includes a precision 90°

phase shifter which allows direct modulation of an RF

signal by the baseband I and Q signals.

■

Single 1.8V to 5.25V Supply

■

Direct IQ Modulator with Integrated 90° Phase

Shifter*

■

Four Step RF Power Control

■

120MHz Modulation Bandwidth

■

Independent Double-Balanced Mixer

■

Modulation Accuracy Insensitive to Carrier Input

In a superheterodyne system, the mixer can be used to

generatethehigh-frequencyRFinputforthemodulatorby

mixing the system’s 1st and 2nd local oscillators.

Power

■

Modulator I/Q Inputs Internally Biased

■

Available in 20-Lead FE Package

The LT5503 modulator output P 1dB is –3dBm at 2.5GHz.

The VGA allows output power reduction in three steps up

to 13dB with digital control. The baseband inputs are

internally biased for maximum input voltage swing at low

supply voltage. If needed, they can be driven with external

bias voltages.

APPLICATIO S

■

IEEE 802.11 DSSS and FHSS

■

High Speed Wireless LAN (WLAN)

■

Wireless Local Loop (WLL)

■

PCS Wireless Data

■

MMDS

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners. *Patent Pending

TYPICAL APPLICATIO

2.45GHz Transmitter Application, Carrier for Modulator Generated by Upmixer

2.45GHz

BPF

SSB Output Power vs

I, Q Amplitude

CC1

CC2

–5

3 VDC

1.8 VDC

5.25 VDC

–10

–15

–20

–25

–30

–35

–40

–45

–

BQ BQ

–

LO2 V LO1

MODIN

V MOD

VGA

MIXER

MIXEN

ENABLE

MODULATOR

ENABLE

LO2IN

(750MHz)

MODEN

LO2

MODOUT

VGA

0°

÷2

90°

÷1

CONTROL

LOGIC

0.01

0.1

LT5503

I, Q DIFFERENTIAL INPUT VOLTAGE (V

)

P-P

GC1

GND

GC2

DMODE

LO1

5503 G04

2.45GHz

MODULATED

RFOUT

5503 TA01

–

LO1IN (2075MHz)

BI BI

5503f

12 3 4 5 6 7...20

中文翻译

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