Electrical Specifications Subject to Change
FEATURES
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LTC5540
0.6GHz to 1.3GHz
High Dynamic Range
Downconverting Mixer
DESCRIPTION
The LTC
®
5540 is part of a family of high dynamic range
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#
LTC5540
LTC5541
LTC5542
LTC5543
RF RANGE
600MHz –1.3GHz
1.3GHz – 2.3GHz
1.6GHz – 2.7GHz
2.3GHz – 4GHz
LO RANGE
700MHz – 1.2GHz
1.4GHz – 2.0GHz
1.7GHz – 2.5GHz
2.4GHz – 3.6GHz
Conversion Gain: 7.9dB at 900MHz
IIP3: 25.9dBm at 900MHz
Noise Figure: 9.9dB at 900MHz
17.7dB NF Under 5dBm Blocking
High Input P1dB
3.3V Supply, 640mW Power Consumption
Shutdown Pin
50Ω Single-Ended RF and LO Inputs
LO Inputs 50Ω Matched when Shutdown
High Isolation LO Switch
0dBm LO Drive Level
High LO-RF and LO-IF Isolation
Small Solution Size
20-Lead (5mm
×
5mm) QFN package
APPLICATIONS
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Wireless Infrastructure Receivers
(LTE, GSM, CDMA)
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.
TYPICAL APPLICATION
Wideband Receiver
1nF
V
CCIF
3.3V or 5V
1nF
150nH
IF
+
C
T
RF
700MHz
TO
915MHz
5.6pF
LNA
IMAGE
BPF
SHDN
(0V/3.3V)
SHDN
BIAS
V
CC2
V
CC
3.3V
1μF
V
CC1
22pF
V
CC3
LO1
LOSEL
LO SELECT
(0V/3.3V)
RF
LO
IF
LTC5540
IF
–
LO2
190MHz
SAW
IF
AMP
190MHz
BPF
ADC
16
15
14
100pF
SYNTH 2
ALTERNATE LO FOR
FREQUENCY-HOPPING
100pF
SYNTH 1
LO
1090MHz
5540 TA01
Wideband Conversion Gain, IIP3
and NF vs RF Input Frequency
28
27
26
T
A
= +25°C
F
IF
= 190MHz
F
LO
= F
RF
+ F
IF
IIP3
25
24
23
22
21
G
C
20
19
800
700
900
RF FREQUENCY (MHz)
18
1000
5540 TA01a
1μF
22pF
150nH
1.5pF
G
C
(dB), NF (dB)
13
12
11
10
9
8
7
6
600
NF
5540p
LINEAR TECHNOLOGY CONFIDENTIAL
1
IIP3 (dBm)
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