LINER LTC5543

Electrical Specifications Subject to Change
LTC5540
0.6GHz to 1.3GHz
High Dynamic Range
Downconverting Mixer
DESCRIPTION
FEATURES
n
n
n
n
n
n
n
n
n
n
n
n
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
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.
APPLICATIONS
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.
n
High Dynamic Range Downconverting Mixer Family
n
n
n
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.
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
190MHz
SAW
1nF
1μF
22pF
IF+
1.5pF
IF
AMP
1nF
150nH
150nH
IF –
100pF
CT
LTC5540
IF
5.6pF
LO2
RF
LNA
ALTERNATE LO FOR
FREQUENCY-HOPPING
LO
IMAGE
BPF
SYNTH 2
BIAS
SHDN
VCC2
VCC 3.3V
28
15
27
14
26
13
12
11
NF
TA = +25°C
FIF = 190MHz
FLO = FRF + FIF
25
IIP3
24
23
10
22
21
9
100pF
SHDN
(0V/3.3V)
16
1μF
VCC1
22pF
VCC3
LO1
LOSEL
LO SELECT
(0V/3.3V)
8
SYNTH 1
LO
1090MHz
IIP3 (dBm)
RF
700MHz
TO
915MHz
ADC
GC (dB), NF (dB)
VCCIF
3.3V or 5V
Wideband Conversion Gain, IIP3
and NF vs RF Input Frequency
190MHz
BPF
20
GC
7
6
600
5540 TA01
19
800
700
900
RF FREQUENCY (MHz)
18
1000
5540 TA01a
5540p
LINEAR TECHNOLOGY CONFIDENTIAL
1