LTC6410-6
Low Distortion, Low Noise
Differential IF Amplifier with
Configurable Input Impedance
DESCRIPTION
FEATURES
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
becauseoftheimpedanceconversionandimprovednoise
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.
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 )
8dB NF (200Ω Z )
IN
IN
n
n
n
n
n
Differential Inputs and Outputs
The LTC6410-6 operates on 3V or 5V supplies. It comes in
acompact16-lead3mm×3mmQFNpackageandoperates
over a –40°C to 85°C temperature range.
Self-Biasing Inputs/Outputs
Shutdown Mode
Minimal Support Circuitry Required
16-Lead 3mm × 3mm × 0.8mm QFN Package
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
Differential Line Driver/Receiver
n
TYPICAL APPLICATION
2-Tone Spectrum Analyzer Plot
Post Mixer Gain Block (140MHz IF)
5V
0
5V
–10
–20
82nH
82nH
12pF
680pF
0.1μF
–TERM
–IN
–30
–40
–50
–60
–70
–80
–90
–100
24nH
18pF
+
V
SHDN
–OUT
+OUT
LTC6410-6
24nH
18pF
V
BIAS
+IN
–
V
64106 TA01a
+TERM
12pF
0.1μF
1760MHz
LO
130 132 134 136 138 140 142 144 146 148 150
FREQUENCY (MHz)
LT5527
MIXER
SYSTEM OIP3 = 29dBm AT 1900MHz
SYSTEM NF = 15dB AT 1900MHz
64106 TA01b
64106fa
1