LTC5540_15 Datasheet, PDF (1/16 Pages) Linear Technology – 600MHz to 1.3GHz High Dynamic Range Downconverting Mixer

Features
n _{Conversion Gain: 7.9dB at 900MHz}
n _{IIP3: 25.9dBm at 900MHz}
n _{Noise Figure: 9.9dB at 900MHz}
n _{16.2dB NF Under +5dBm Blocking}
n _{High Input P1dB}
n _{3.3V Supply, 640mW 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, GSM, W-CDMA)
n _{Point-to-Point Microwave links}
n _{High Dynamic Range Downmixer Applications}
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Technology Corporation. All other trademarks are the property of their respective owners.
LTC5540
600MHz to 1.3GHz
High Dynamic Range
Downconverting Mixer
Description
The LTC^®5540 is part of a family of high dynamic range, high
gain passive downconverting mixers covering the 600MHz
to 4GHz frequency range. The LTC5540 is optimized for
0.6GHz to 1.3GHz RF applications. The LO frequency
must fall within the 0.7GHz to 1.2GHz range for optimum
performance. A typical application is a LTE or GSM receiver
with a 700MHz to 915MHz RF input and high-side LO.
The LTC5540 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 LTC5540’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
700MHz
TO
915MHz
1.5pF
CT
5.6pF
IF⁺
IF ^–
IF
LTC5540
100pF
LO2
SYNTH 2
RF
LNA
IMAGE
LO
ALTERNATE LO FOR
FREQUENCY-HOPPING
BPF
SHDN
(0V/3.3V)
BIAS
SHDN
100pF
LO1
SYNTH 1
V_CC2
V_CC1 V_CC3
LOSEL
LO
V_CC 3.3V
1µF
22pF
LO SELECT
(0V/3.3V)
1090MHz
5540 TA01
Wideband Conversion Gain, IIP3
and NF vs RF Input Frequency
16
15
14
13
12
11 _NF
10
9
8 G_C
7
6
600
28
27
26
T_A = +25°C
f_IF = 190MHz
f_LO = f_RF + f_IF
IIP3 25
24
23
22
21
20
19
700
800
900
RF FREQUENCY (MHz)
18
1000
5540 TA01a
5540f