LTC6430-15
High Linearity Differential
RF/IF Amplifier/ADC Driver
FeaTures
DescripTion
The LTC®6430-15 is a differential gain block amplifier
designed to drive high resolution, high speed ADCs with
excellent linearity beyond 1000MHz and with low associ-
atedoutputnoise. TheLTC6430-15operatesfromasingle
5V power supply and consumes only 800mW.
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50.0dBm OIP3 at 240MHz into a 100Ω Diff Load
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NF = 3.0dB at 240MHz
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20MHz to 2000MHz Bandwidth
15.2dB Gain
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A-Grade 100% OIP3 Tested at 240MHz
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1.0nV/√Hz Total Input Noise
Initsdifferentialconfiguration,theLTC6430-15candirectly
drive the differential inputs of an ADC. Using 1:2 baluns,
the device makes an excellent 50Ω wideband balanced
amplifier. While using 1:1.33 baluns, the device makes
a high fidelity 50MHz to 1000MHz 75Ω CATV amplifier.
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S11 < –15dB Up to 1.2GHz
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S22 < –15dB Up to 1.2GHz
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>2.75V Linear Output Swing
P-P
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P1dB = 24.0dBm
Insensitive to V Variation
CC
The LTC6430-15 is designed for ease of use, requiring a
minimum of support components. The device is internally
matched to 100Ω differential source/load impedance. On-
chipbiasandtemperaturecompensationensureconsistent
performance over environmental changes.
100Ω Differential Gain-Block Operation
Input/Output Internally Matched to 100Ω Diff
Single 5V Supply
DC Power = 800mW
Unconditionally Stable
4mm × 4mm, 24-Lead QFN Package
The LTC6430-15 uses a high performance SiGe BiCMOS
process for excellent repeatability compared with similar
GaAsamplifiers.AllA-gradeLTC6430-15devicesaretested
and guaranteed for OIP3 at 240MHz. The LTC6430-15 is
housed in a 4mm × 4mm, 24-lead, QFN package with an
exposedpadforthermalmanagementandlowinductance.
For a single-ended 50Ω IF gain block with similar perfor-
applicaTions
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Differential ADC Driver
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Differential IF Amplifier
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OFDM Signal Chain Amplifier
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50Ω Balanced IF Amplifier
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75Ω CATV Amplifier
mance, see the related LTC6431-15.
.
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700MHz to 800MHz LTE Amplifier
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.
OIP3 vs Frequency
Typical applicaTion
50
48
46
44
42
40
38
36
Differential 16-Bit ADC Driver
5V
V
CM
R
F
V
= 5V
CC
CHOKES
1:2
BALUN
ADC
V
P
= 5V
LTC6430-15
R
CC
50Ω
= 2dBm/TONE
OUT
IN
Z
T
= Z
= 100Ω DIFF.
OUT
= 25°C
= 100Ω
R
= 100Ω
FILTER
LOAD
A
SOURCE
643015 TA01a
DIFFERENTIAL
DIFFERENTIAL
0
200
400
600
800 1000 1200
FREQUENCY (MHz)
643015 TA01b
643015f
1