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Linear Technology Electronic Components Datasheet

LT5575 Datasheet

800MHz to 2.7GHz High Linearity Direct Conversion Quadrature Demodulator

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LT5575
FEATURES
800MHz to 2.7GHz
High Linearity Direct Conversion
Quadrature Demodulator
DESCRIPTION
Input Frequency Range: 0.8GHz to 2.7GHz*
50Ω Single-Ended RF and LO Ports
High IIP3: 28dBm at 900MHz, 22.6dBm at 1.9GHz
High IIP2: 54.1dBm at 900MHz, 60dBm at 1.9GHz
Input P1dB: 13.2dBm at 900MHz
I/Q Gain Mismatch: 0.04dB Typical
I/Q Phase Mismatch: 0.4° Typical
Low Output DC Offsets
Noise Figure: 12.8dB at 900MHz, 12.7dB at 1.9GHz
Conversion Gain: 3dB at 900MHz, 4.2dB at 1.9GHz
Very Few External Components
Shutdown Mode
16-Lead QFN 4mm × 4mm Package with
Exposed Pad
APPLICATIONS
Cellular/PCS/UMTS Infrastructure
RFID Reader
High Linearity Direct Conversion I/Q Receiver
The LT®5575 is an 800MHz to 2.7GHz direct conversion
quadrature demodulator optimized for high linearity
receiver applications. It is suitable for communications
receivers where an RF signal is directly converted into I
and Q baseband signals with bandwidth up to 490MHz.
The LT5575 incorporates balanced I and Q mixers, LO
buffer amplifiers and a precision, high frequency quadrature
phase shifter. The integrated on-chip broadband transform-
ers provide 50Ω single-ended interfaces at the RF and LO
inputs. Only a few external capacitors are needed for its
application in an RF receiver system.
The high linearity of the LT5575 provides excellent spur-
free dynamic range for the receiver. This direct conversion
demodulator can eliminate the need for intermediate fre-
quency (IF) signal processing, as well as the corresponding
requirements for image filtering and IF filtering. Channel
filtering can be performed directly at the outputs of the I
and Q channels. These outputs can interface directly to
channel-select filters (LPFs) or to baseband amplifiers.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
*Operation over a wider frequency range is possible with reduced performance. Consult
the factory.
TYPICAL APPLICATION
High Signal-Level I/Q Demodulator for Wireless Infrastructure
+5V
BPF
LNA
BPF RF
INPUT
RF
VCC
0°
LT5575
IOUT+
LPF
IOUT–
VGA
A/D
LO INPUT
LO
0°/90°
ENABLE EN
90° QOUT+ LPF
VGA
QOUT–
5575 TA01
A/D
Conversion Gain, NF, IIP3 and IIP2
vs LO Input Power at 1900MHz
35 70
IIP2
30 60
25 IIP3 50
20
15
10
–40°C
25°C
85°C
5
DSB NF
CONV
GAIN
40
30
20
10
0
–15
–10 –5
0
LO INPUT POWER (dBm)
0
5
5575 TA01b
5575f
1


Linear Technology Electronic Components Datasheet

LT5575 Datasheet

800MHz to 2.7GHz High Linearity Direct Conversion Quadrature Demodulator

No Preview Available !

LT5575 pdf
LT5575www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Power Supply Voltage..............................................5.5V
Enable Voltage ................................ –0.3V to VCC + 0.3V
LO Input Power....................................................10dBm
RF Input Power ....................................................20dBm
RF Input DC Voltage...............................................±0.1V
LO Input DC Voltage ..............................................±0.1V
Operating Ambient Temperature ..............–40°C to 85°C
Storage Temperature Range...................–65°C to 125°C
Maximum Junction Temperature .......................... 125°C
CAUTION: This part is sensitive to electrostatic discharge
(ESD). It is very important that proper ESD precautions
be observed when handling the LT5575.
PIN CONFIGURATION
TOP VIEW
16 15 14 13
GND 1
RF 2
GND 3
12 VCC
11 GND
17
10 LO
GND 4
9 GND
5678
UF PACKAGE
16-LEAD (4mm × 4mm) PLASTIC QFN
TJMAX = 125°C, θJA = 37°C/W
EXPOSED PAD (PIN #17) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LT5575EUF#PBF
LT5575EUF#TRPBF
5575
16-Lead (4mm × 4mm) QFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
–40°C to 85°C
DC ELECTRICAL CHARACTERISTICS VCC = +5V, TA = 25°C, unless otherwise noted. (Note 3)
PARAMETER
CONDITIONS
MIN TYP MAX
Supply Voltage
4.5 5.25
Supply Current
132 155
Shutdown Current
EN = Low
< 1 100
Turn On Time
120
Turn Off Time
750
EN = High (On)
2
EN = Low (Off)
1
EN Input Current
Output DC Offset Voltage
( | IOUT+ – IOUT– |, | QOUT+ – QOUT– | )
Output DC Offset Variation
vs Temperature
VENABLE = 5V
fLO = 1900MHz, PLO = 0dBm
–40°C to 85°C
120
<9
38
UNITS
V
mA
µA
ns
ns
V
V
µA
mV
µV/°C
5575f
2


Part Number LT5575
Description 800MHz to 2.7GHz High Linearity Direct Conversion Quadrature Demodulator
Maker Linear Technology
Total Page 16 Pages
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