LTC6430-15 Datasheet, PDF (1/28 Pages) Linear Technology – High Linearity Differential RF/IF Amplifier/ADC Driver

Features
n _{50.0dBm OIP3 at 240MHz into a 100Ω Diff Load}
n _{NF = 3.0dB at 240MHz}
n _{20MHz to 2000MHz Bandwidth}
n _{15.2dB Gain}
n _{A-Grade 100% OIP3 Tested at 240MHz}
n _{1.0nV/√Hz Total Input Noise}
n _{S11 < –15dB Up to 1.2GHz}
n _{S22 < –15dB Up to 1.2GHz}
n _{>2.75VP-P Linear Output Swing}
n _{P1dB = 24.0dBm}
n _{Insensitive to VCC Variation}
n _{100Ω Differential Gain-Block Operation}
n _{Input/Output Internally Matched to 100Ω Diff}
n _{Single 5V Supply}
n _{DC Power = 800mW}
n _{Unconditionally Stable}
n _{4mm × 4mm, 24-Lead QFN Package}
Applications
n _{Differential ADC Driver}
n _{Differential IF Amplifier}
n _{OFDM Signal Chain Amplifier}
n _{50Ω Balanced IF Amplifier}
n _{75Ω CATV Amplifier}
n _{700MHz to 800MHz LTE Amplifier}
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LTC6430-15
High Linearity Differential
RF/IF Amplifier/ADC Driver
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-
ated output noise. The LTC6430-15 operates from a single
5V power supply and consumes only 800mW.
In its differential configuration, the LTC6430-15 can directly
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.
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-
chip bias and temperature compensation ensure consistent
performance over environmental changes.
The LTC6430-15 uses a high performance SiGe BiCMOS
process for excellent repeatability compared with similar
GaAs amplifiers. All A-grade LTC6430-15 devices are tested
and guaranteed for OIP3 at 240MHz. The LTC6430-15 is
housed in a 4mm × 4mm, 24-lead, QFN package with an
exposed pad for thermal management and low inductance.
For a single-ended 50Ω IF gain block with similar perfor-
mance, see the related LTC6431-15..
Typical Application
Differential 16-Bit ADC Driver
5V
1:2
BALUN
V_CC = 5V
R_F
CHOKES
50Ω
LTC6430-15
R_SOURCE = 100Ω
DIFFERENTIAL
R_LOAD = 100Ω
DIFFERENTIAL
FILTER
V_CM
ADC
643015 TA01a
OIP3 vs Frequency
50
48
46
44
42
40
V_CC = 5V
38
P_OUT = 2dBm/ TONE
Z_IN = Z_OUT = 100Ω DIFF.
T_A = 25°C
36
0 200 400 600 800
FREQUENCY (MHz)
1000 1200
643015 TA01b
643015f
1