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LT5517EUF#TR

Description
IC demod quad 40-900mhz 16-qfn
CategoryTopical application    Wireless rf/communication   
File Size207KB,12 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LT5517EUF#TR Overview

IC demod quad 40-900mhz 16-qfn

LT5517
40MHz to 900MHz
Quadrature Demodulator
FEATURES
s
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
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
16-Lead QFN (4mm
×
4mm) Package
with Exposed Pad
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-
anced I and Q mixers, LO buffer amplifiers and a precision,
broadband quadrature generator derived from an on-chip
divide-by-two circuit.
The superior linearity and low noise performance of the
LT5517 is achieved across its full frequency range. A well-
balanced divide-by-two circuit generates precision quadra-
ture LO carriers to drive the I mixer and the Q mixer.
Consequently, the outputs of the I-channel and the
Q-channel are well matched in amplitude, and their phases
are 90° apart. The LT5517 also provides excellent 50Ω
impedance matching at the 2XLO port across its entire
frequency range.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
Wireless Infrastructure
High Linearity Direct Conversion I/Q Receiver
High Linearity I/Q Demodulator
TYPICAL APPLICATIO
BPF
LNA
BPF
5V
RF
+
V
CC
LT5517
I
OUT+
I
OUT–
LPF
VGA
RF
20
0
P
OUT
, IM3, IM2 (dBm/TONE)
DSP
Q
OUT+
÷2
90°
ENABLE
EN
Q
OUT–
5517 F01
LPF
VGA
2xLO
INPUT
2xLO
Figure 1. High Signal-Level I/Q Demodulator for 450MHz Infrastructure Receiver
U
I/Q Output Power, IM3, IM2
vs RF Input Power
P
OUT
–20
T
A
= 25°C
P
2XLO
= –10dBm
–40 f
2XLO
= 1602MHz
f
RF1
= 799.9MHz
f
RF2
= 800.1MHz
–60
–80
–100
–18
IM3
IM2
–14
–10
–6
–2
RF INPUT POWER (dBm)
2
5517 F01b
U
U
5517f
1

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