LTC5543 Datasheet, PDF (1/1 Pages) Linear Technology – 2.3GHz to 4GHz High Dynamic Range Downconverting Mixer

FEATURES
n _{Conversion Gain: 8.4dB at 2500MHz}
n _{IIP3: 24.5dBm at 2500MHz}
n _{Noise Figure: 10.2dB at 2500MHz}
n _{High Input P1dB}
n _{3.3V Supply, 660mW Power Consumption}
n _{Shutdown Pin}
n _{50Ω Single-Ended RF and LO Inputs}
n _{LO Inputs 50Ω Matched when Shutdown}
n _{High Isolation LO Switch}
n _{0dBm LO Drive Level}
n _{High LO-RF and LO-IF Isolation}
n _{Small Solution Size}
n _{20-Lead (5mm × 5mm) QFN package}
APPLICATIONS
n _{Wireless Infrastructure Receivers}
(LTE, WiMAX, WCS)
n _{High Dynamic Range Downmixer Applications}
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Electrical Specifications Subject to Change
LTC5543
2.3GHz to 4GHz
High Dynamic Range
Downconverting Mixer
DESCRIPTION
The LTC^®5543 is part of a family of high dynamic range
passive downconverting mixers covering the 700MHz to
4GHz frequency range. The LTC5543 is optimized for 2.3GHz
to 4GHz RF applications. The LO frequency must fall within
the 2.4GHz to 3.6GHz range for optimum performance. A
typical application is a LTE or WiMAX receiver with a 2.3GHz
to 2.7GHz RF input and high-side LO.
The LTC5543 is designed for 3.3V operation, however; the
IF amplifier can be powered by 5V for the highest P1dB.
An integrated SPDT LO switch with fast switching accepts
two active LO signals, while providing high isolation.
The LTC5543’s high conversion gain and high dynamic
range enable the use of lossy IF filters in high-selectivity
receiver designs, while minimizing the total solution cost,
board space and system-level variation.
High Dynamic Range Downconverting Mixer Family
PART#
RF RANGE
LO RANGE
LTC5540
600MHz –1.3GHz
700MHz – 1.2GHz
LTC5541
1.3GHz – 2.3GHz
1.4GHz – 2.0GHz
LTC5542
1.6GHz – 2.7GHz
1.7GHz – 2.5GHz
LTC5543
2.3GHz – 4GHz
2.4GHz – 3.6GHz
TYPICAL APPLICATION
Wideband Receiver
1nF
190MHz
SAW
190MHz
BPF
V_CCIF
1nF
IF
3.3V or 5V
1μF
22pF 150nH 150nH
AMP
ADC
RF
2500MHz
TO
2570MHz
IMAGE
BPF _1.2nH
LNA
0.8pF
IF⁺ IF^–
IF
RF
LTC5543
LO
2.7pF
LO2
SYNTH 2
ALTERNATE LO FOR
FREQUENCY-HOPPING
SHDN
(0V/3.3V)
BIAS
SHDN
V_CC2
V_CC1
V_CC 3.3V
1μF
22pF
2.7pF
V_CC3
LO1
LOSEL
LO SELECT
(0V/3.3V)
SYNTH 1
LO
2725MHz
5543 TA01
Wideband Conversion Gain, IIP3
and NF vs IF Output Frequency
9.0
26
8.9
f_LO = 2725MHz
8.8 _{PLO = 0dBm}
8.7
RF = 2535 ±35MHz
TEST CIRCUIT IN FIGURE 1
8.6
IIP3 ²⁴
22
20
18
8.5
16
8.4 ^GC
14
8.3
12
8.2
10
NF
8.1
8
8.0
155
6
165 175 185 195 205 215 225
IF OUTPUT FREQUENCY (MHz)
5543 TA02
5543p
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