LTC5551_15 Datasheet, PDF (1/24 Pages) Linear Technology – 300MHz to 3.5GHz Ultra-High Dynamic Range Downconverting Mixer

Features
n _{+36dBm Input IP3}
n _{2.4dB Conversion Gain}
n _{Low Noise Figure: <10dB}
n _{+18dBm Ultra High Input P1dB}
n _{670mW Power Consumption}
n _{2.5V to 3.6V Operation}
n _{50Ω Single-Ended RF and LO Inputs}
n _{0dBm LO Drive Level}
n _{Low Power Mode}
n _{–40°C to 105°C Operation (TC)}
n _{Small Solution Size}
n _{Enable Pin}
n _{16-Lead (4mm × 4mm) QFN Package}
Applications
n _{GSM, LTE, LTE-Advanced Basestations}
n _Repeaters
n _{DPD Observation Receiver}
n _{Public Safety Radios, Military and Defense}
n _{Avionics Radios and TCAS Transponders}
n _{Active Phased-Array Antennas}
n _{White-Space Radio Receiver}
LTC5551
300MHz to 3.5GHz
Ultra-High Dynamic Range
Downconverting Mixer
Description
The LTC^®5551 is a 2.5V to 3.6V mixer optimized for RF
downconverting mixer applications that require very high
dynamic range. The LTC5551 covers the 300MHz to
3.5GHz RF Frequency range with LO frequency range
of 200MHz to 3.5GHz. The LTC5551 provides very high
IIP3 and P1dB with low power consumption. A typical
application is a basestation receiver covering 700MHz to
2.7GHz frequency range. The RF input can be matched for a
wide range of frequencies and the IF is usable up to 1GHz.
A low power mode is activated by pulling the ISEL pin high,
reducing the power consumption by about 1/3, however,
with a corresponding reduction in IIP3 to approximately
+29dBm. The mixer can also be turned on or off by using
the EN pin.
The LTC5551’s high level of integration minimizes the
total solution cost, board space and system level variation,
while providing the highest dynamic range for demanding
receiver 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.
Protected by U.S. Patents, including 8558605.
Typical Application
Wideband Receiver
V_CC
3.3V
0.56µF
22pF
1nF
470nH
475Ω
470nH
475Ω
BPF
1nF
LTC6416
IF
AMP
LTC2208
ADC
IF⁺ IF^–
2.2pF
IF
LTC5551
3.9pF
LTC6946
RF_IN
RF
LO
SYNTH
LO
7.5nH
LO
1700MHz
EN
(0V/3.3V)
V_CC
3.3V
BIAS
EN
V_CC
0.56µF
22pF
5551 TA01a
For more information www.linear.com/LTC5551
Mixer Conversion Gain and IIP3
vs IF Frequency (Low-Side LO)
39
6
36
33
IIP3
5
30
27 _{RF = 1770MHz TO 1970MHz}
4
24 ^{LO = 1700MHz}
Z_IF = 200Ω
21
3
18
G_C
15
2
12
9
70
NORMAL POWER MODE
LOW POWER MODE
1
90 110 130 150 170 190 210 230 250 270
IF FREQUENCY (MHz)
5551 TA01b
5551fa
1