LTC5577_15 Datasheet, PDF (1/20 Pages) Linear Technology – 300MHz to 6GHz High Signal Level Active Downconverting Mixer

Features
n _{+30dBm IIP3}
n _{+15dBm Input P1dB}
n _{0dB Conversion Gain}
n _{Wideband Differential IF Output}
n _{Very Low 2 × 2 and 3 × 3 Spurs}
n _{IF Frequency Range Up to 1.5GHz}
n _{Low LO-RF Leakage}
n _{LO Input 50Ω Matched when Shutdown}
n _{–40°C to 105°C Operation (TC)}
n _{Very Small Solution Size}
n _{16-Lead (4mm × 4mm) QFN package}
Applications
n _{Wireless Infrastructure Receivers}
n _{DPD Observation Receivers}
n _{CATV Infrastructure}
LTC5577
300MHz to 6GHz
High Signal Level Active
Downconverting Mixer
Description
The LTC^®5577 active mixer is optimized for RF downcon-
verting applications that require high input signal handling
capability and wide bandwidth. The wideband IF output uses
external resistors to set the output impedance, allowing
the flexibility to match directly into differential IF loads,
such as filters and amplifiers. The part is characterized
and specified with a 100Ω differential output impedance,
although it can be used with output impedances ranging
from 50Ω to 400Ω, with higher gain and reduced IIP3
and P1dB at the higher impedance levels. The IF output
is usable up to 1.5GHz.
In receiver applications, the high input P1dB and IIP3 allow
the use of higher gain low noise amplifiers, resulting in
higher receiver sensitivity. Integrated transformers on the
RF and LO inputs provide single-ended 50Ω interfaces,
while minimizing the solution size.
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 Downconverting Mixer with 1GHz IF Bandwidth and
+15dBm Input P1dB into 100Ω Load
100Ω IF LOAD
50Ω
50Ω
1nF
560nH
115Ω
560nH
1nF
115Ω
8.2pF
RF
0.7pF
LTC5577 IF⁺
RF
EN
EN
BIAS
V_CC
1nF
IF ^–
3.9pF
1nF
LO
LO
IADJ
5577 TA01a
3.3V
180mA
Voltage Conversion Gain and
IIP3 vs IF Output Frequency
33
9
IIP3
30
8
27
7
RF = 1.6GHz TO 2.6GHz
24 ^{LO = 1.59GHz/0dBm}
6
Z_RF = 50Ω
21
Z_IF = 100Ω DIFFERENTIAL
T_C = 25°C
5
18
4
15
G_V
3
12
2
10 110 210 310 410 510 610 710 810 910 1010
IF OUTPUT FREQUENCY (MHz)
5577 TA01b
5577f
For more information www.linear.com/LTC5577
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