LTC5542_15 Datasheet, PDF (1/16 Pages) Linear Technology – 1.6GHz to 2.7GHz High Dynamic Range Downconverting Mixer

FEATURES
n _{Conversion Gain: 8dB at 2.4GHz}
n _{IIP3: 26.8dBm at 2.4GHz}
n _{Noise Figure: 9.9dB at 2.4GHz}
n _{17.3dB NF Under +5dBm Blocking}
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, W-CDMA. TD-SCDMA, WiMAX, GSM1800)
n _{Point-to-Point Microwave Links}
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.
LTC5542
1.6GHz to 2.7GHz
High Dynamic Range
Downconverting Mixer
DESCRIPTION
The LTC^®5542 is part of a family of high dynamic range, high
gain, passive downconverting mixers covering the 600MHz
to 4GHz frequency range. The LTC5542 is optimized for
1.6GHz to 2.7GHz RF applications. The LO frequency
must fall within the 1.7GHz to 2.5GHz range for optimum
performance. A typical application is a LTE or WiMAX receiver
with a 2.3GHz to 2.7GHz RF input and low-side LO.
The LTC5542 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 LTC5542’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
2300MHz
TO
2400MHz
IMAGE
BPF ^22pF
LNA
0.7pF
IF⁺ IF^–
IF
LTC5542
RF
LO
4.7pF
LO2
SYNTH 2
ALTERNATE LO FOR
FREQUENCY-HOPPING
SHDN
(0V/3.3V)
BIAS
SHDN
V_CC2
V_CC1
V_CC 3.3V
1μF
22pF
4.7pF
V_CC3
LO1
LOSEL
LO SELECT
(0V/3.3V)
SYNTH 1
LO
2160MHz
5542 TA01
Wideband Conversion Gain, IIP3
and NF vs IF Output Frequency
11.0
10.5 RF = 2350 ±50MHz
LO = 2160MHz
10.0 _{PLO = 0dBm}
9.5 ^{TEST CIRCUIT IN FIGURE 1}
28
IIP3 ₂₆
24
22
9.0
20
8.5
18
8.0 G_C
16
±30MHz
7.5
14
7.0
12
6.5
10
NF
6.0
8
140 150 160 170 180 190 200 210 220 230 240
IF OUTPUT FREQUENCY (MHz)
5542 TA01a
5542f
1