LTC6410-6 Datasheet, PDF (1/16 Pages) Linear Technology – Low Distortion, Low Noise Differential IF Amplifi er with Confi gurable Input Impedance

LTC6410-6
FEATURES
Low Distortion, Low Noise
Differential IF Amplifier with
Configurable Input Impedance
DESCRIPTION
n _{1.4GHz –3dB Bandwidth}
n _{Fixed Voltage Gain of 6dB (50Ω System)}
n _{Configurable Input Impedance Allows:}
Simple Interface to Active Mixers
Improved Noise Performance
n _{Wide 2.8V to 5.25V Supply Range}
n _{Low Distortion:}
36dBm OIP3 (70MHz)
33dBm OIP3 (140MHz)
31dBm OIP3 (300MHz)
n _{Low Noise:}
11dB NF (50Ω Z_IN)
8dB NF (200Ω Z_IN)
n _{Differential Inputs and Outputs}
n _{Self-Biasing Inputs/Outputs}
n _{Shutdown Mode}
n _{Minimal Support Circuitry Required}
n _{16-Lead 3mm × 3mm × 0.8mm QFN Package}
The LTC^®6410-6 is a low distortion, low noise differential
IF amplifier with configurable input impedance designed
for use in applications from DC to 1.4GHz. The LTC6410-6
has 6dB of voltage gain. The LTC6410-6 is an excellent
choice for interfacing active mixers to SAW filters. It fea-
tures an active input termination that allows a customized
input impedance for an optimum interface to differential
active mixers. This feature provides additional power gain
because of the impedance conversion and improved noise
performance when compared to traditional 50Ω interface
circuits. The LTC6410-6 drives a differential 50Ω load
directly with low distortion, which is suitable for driving
SAW filters and other 50Ω signal chain blocks.
The LTC6410-6 operates on 3V or 5V supplies. It comes in
a compact 16-lead 3mm × 3mm QFN package and operates
over a –40°C to 85°C temperature range.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
APPLICATIONS
n _{Post-Mixer Gain Block}
n _{SAW Filter Interface/Buffering}
n _{Differential IF Signal Chain Gain Block}
n _{Differential Line Driver/Receiver}
TYPICAL APPLICATION
Post Mixer Gain Block (140MHz IF)
5V
5V
82nH
82nH
12pF
1760MHz
LO
12pF
LT5527
MIXER
24nH
18pF
24nH
18pF
–TERM
–IN
680pF
V⁺
SHDN
–OUT
LTC6410-6
+IN
+TERM
+OUT
V_BIAS
V^–
0.1μF
SYSTEM OIP3 = 29dBm AT 1900MHz
SYSTEM NF = 15dB AT 1900MHz
0.1μF
64106 TA01a
2-Tone Spectrum Analyzer Plot
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
130 132 134 136 138 140 142 144 146 148 150
FREQUENCY (MHz)
64106 TA01b
64106fa
1