LT5515

更新时间： 2024-01-21 08:02:46

品牌	Logo	应用领域
凌特 - Linear		/
页数	文件大小	规格书
12页	210K
描述
40MHz to 900MHz Quadrature Demodulator

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中文翻译

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数据手册

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LT5515 数据手册

LT5517

40MHz to 900MHz

Quadrature Demodulator

FEATURES

DESCRIPTIO

The LT^®5517 is a 40MHz to 900MHz quadrature demodu-

lator optimized for high linearity receiver applications

where high dynamic range is important. It is suitable for

communications receivers where an RF or IF signal is

directly converted into I and Q baseband signals with a

bandwidth up to 130MHz. The LT5517 incorporates bal-

ancedIandQmixers, LObufferamplifiersandaprecision,

broadband quadrature generator derived from an on-chip

divide-by-two circuit.

■

RF Input Frequency Range: 40MHz to 900MHz

■

High IIP3: 21dBm at 800MHz

■

High IIP2: 58dBm at 800MHz

■

I/Q Gain Mismatch: 0.3dB Max

■

I/Q Phase Mismatch: 0.7°

■

Noise Figure: 12.4dB at 800MHz

■

Conversion Gain: 3.3dB at 800MHz

■

Baseband Bandwidth: 130MHz

■

Single Ended, 50Ω Matched 2XLO Input

■

Shutdown Mode

The superior linearity and low noise performance of the

LT5517 is achieved across its full frequency range. A well-

balanceddivide-by-twocircuitgeneratesprecisionquadra-

ture LO carriers to drive the I mixer and the Q mixer.

Consequently, the outputs of the I-channel and the

Q-channelarewellmatchedinamplitude,andtheirphases

are 90° apart. The LT5517 also provides excellent 50Ω

impedance matching at the 2XLO port across its entire

frequency range.

■

16-Lead QFN (4mm × 4mm) Package

with Exposed Pad

APPLICATIO S

■

Wireless Infrastructure

■

High Linearity Direct Conversion I/Q Receiver

■

High Linearity I/Q Demodulator

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

TYPICAL APPLICATIO

I/Q Output Power, IM3, IM2

vs RF Input Power

BPF

LT5517

LNA

LPF

OUT

VGA

OUT

–

–20

–40

0°

= 25°C

2XLO

= 1602MHz

= 799.9MHz

= 800.1MHz

–

= –10dBm

2XLO

RF1

RF2

DSP

IM3

–60

–80

–

LPF

OUT

IM2

2xLO

INPUT

÷2

OUT

90°

ENABLE

5517 F01

–100

–18

–14

–10

–6

–2

RF INPUT POWER (dBm)

Figure 1. High Signal-Level I/Q Demodulator for 450MHz Infrastructure Receiver

5517 F01b

5517f

12 3 4 5 6 7...12

中文翻译

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