LTC6430-20_15 Datasheet, PDF (1/28 Pages) Linear Technology – High Linearity Differential RF/IF Amplifier/ADC Driver

FEATURES
n _{51.0dBm OIP3 at 240MHz into a 100Ω Diff Load}
n _{NF = 2.9dB at 240MHz}
n _{20MHz to 2060MHz –3dB Bandwidth}
n _{20.8dB Gain}
n _{A-Grade 100% OIP3 Tested at 380MHz}
n _{0.6nV/√Hz Total Input Noise}
n _{S11 < –10dB Up to 1.4GHz}
n _{S22 < –10dB Up to 1.4GHz}
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 = 850mW}
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}
n _{Low Phase Noise Clock or LO Amplifier}
LTC6430-20
High Linearity Differential
RF/IF Amplifier/ADC Driver
DESCRIPTION
The LTC^®6430-20 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 LTC6430-20 operates from a single
5V power supply and consumes only 850mW.
In its differential configuration, the LTC6430-20 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 creates
a high fidelity 40MHz to 1000MHz 75Ω CATV amplifier.
The LTC6430-20 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 LTC6430-20 uses a high performance SiGe BiCMOS
process for excellent repeatability compared with similar
GaAs amplifiers. All A-grade LTC6430-20 devices are tested
and guaranteed for OIP3 at 380MHz. The LTC6430-20 is
housed in a 4mm × 4mm, 24-lead, QFN package with an
exposed pad for thermal management and low inductance.
A single-ended 50Ω IF gain block with similar performance
is also available, see the related LTC6431-20.
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
Differential 16-Bit ADC Driver
5V
OIP3 vs Frequency
55
V_CM
50
1:2
BALUN
V_CC = 5V
R_F
CHOKES
50Ω
LTC6430-20
R_SOURCE = 100Ω
DIFFERENTIAL
R_LOAD = 100Ω
DIFFERENTIAL
FILTER
ADC
643020 TA01a
For more information www.linear.com/LTC6430-20
45
40
35
V_CC = 5V
P_OUT = 3dBm/ TONE
Z_IN = Z_OUT = 100Ω DIFF.
T_A = 25°C
30
0
200 400 600
FREQUENCY (MHz)
800 1000
643020 TA01b
643020f
1