LTC5541_09 Datasheet, PDF (1/16 Pages) Linear Technology – 1.3GHz to 2.3GHz High Dynamic Range Downconverting Mixer

FEATURES
n _{Conversion Gain: 7.8dB at 1950MHz}
n _{IIP3: 26.4dBm at 1950MHz}
n _{Noise Figure: 9.6dB at 1950MHz}
n _{16dB NF Under +5dBm Blocking}
n _{High Input P1dB}
n _{3.3V Supply, 630mW 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, UMTS, 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.
LTC5541
1.3GHz to 2.3GHz
High Dynamic Range
Downconverting Mixer
DESCRIPTION
The LTC^®5541 is part of a family of high dynamic range passive,
high gain downconverting mixers covering the 600MHz to
4GHz frequency range. The LTC5541 is optimized for 1.3GHz
to 2.3GHz RF applications. The LO frequency must fall within
the 1.4GHz to 2.0GHz range for optimum performance. A
typical application is a LTE or W-CDMA receiver with a 1.7GHz
to 2.2GHz RF input and low-side LO.
The LTC5541 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 LTC5541’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
1920MHz
TO
1980MHz
IF⁺ IF^–
IMAGE
IF
BPF ^2.2pF
RF
LNA
LTC5541
LO
22pF
LO2
SYNTH 2
ALTERNATE LO FOR
FREQUENCY-HOPPING
SHDN
(0V/3.3V)
V_CC 3.3V
BIAS
SHDN
V_CC2
V_CC1
1μF
22pF
22pF
V_CC3
LO1
LOSEL
LO SELECT
(0V/3.3V)
SYNTH 1
LO
1760MHz
5541 TA01
Wideband Conversion Gain, IIP3
and NF vs IF Output Frequency
8.8
28
8.6
RF = 1950 ±30MHz
8.4 _{LO = 1760MHz}
8.2
P_LO = 0dBm
TEST CIRCUIT IN FIGURE 1
8.0
IIP3 ²⁶
24
22
20
7.8 _GC
18
7.6
16
7.4
14
7.2
12
7.0
6.8
160
170 180 190 200 210
IF OUTPUT FREQUENCY (MHz)
10
NF
8
220
5541 TA02
5541f
1