LMH6553 Datasheet, PDF (1/24 Pages) National Semiconductor (TI) – 900 MHz Fully Differential Amplifier With Output Limiting Clamp

November 17, 2008
LMH6553
900 MHz Fully Differential Amplifier With Output Limiting
Clamp
General Description
The LMH6553 is a 900 MHz differential amplifier with an in-
tegrated adjustable output limiting clamp. The clamp increas-
es system performance and provides transient over-voltage
protection to following stages. The internal clamp feature of
the LMH6553 reduces or eliminates the need for external dis-
crete overload protection networks. When used to drive
ADCs, the amplifier's output clamp allows low voltage ADC
inputs to be protected from being overdriven and damaged by
large input signals appearing at the system input. Fast over-
drive recovery of 600 ps ensures the amplifier output rapidly
recovers from a clamping event and quickly resumes to follow
the input signal. The LMH6553 delivers exceptional band-
width, distortion, and noise performance ideal for driving
ADCs up to 14-bits. The LMH6553 could also be used for au-
tomotive, communication, medical, test and measurement,
video, and LIDAR applications.
With external gain set resistors and integrated common mode
feedback, the LMH6553 can be configured as either a differ-
ential input to differential output or single ended input to
differential output gain block. The LMH6553 can be AC or DC
coupled at the input which makes it suitable for a wide range
of applications including communication systems and high
speed oscilloscope front ends. The LMH6553 is available in
8-pin PSOP and 8-pin LLP packages, and is part of our
LMH^® high speed amplifier family.
Features
■ ^{900 MHz −3 dB small signal bandwidth @ A}_V ^{= 1}
■ ^{670 MHz −3 dB large signal bandwidth @ A}_V ^{= 1}
■ ^{−79 dB THD @ 20 MHz}
■ ^{−92 dB IMD3 @ f}_c ^{= 20 MHz}
■ ^{10 ns settling time to 0.1%}
■ ^{600 ps clamp overdrive recovery time}
■ ^{40 mV clamp accuracy with 100% Overdrive}
■ ^{−0.1 mV/°C clamp temperature drift}
■ ^{4.5 to 12 supply voltage operation}
Applications
■ ^{Differential ADC driver}
■ ^{Video over twisted pair}
■ ^{Differential line driver}
■ ^{Single end to differential converter}
■ ^{High speed differential signaling}
■ ^{IF/RF amplifier}
■ ^{SAW filter buffer/driver}
■ ^{CCD Output Limiting Amplifier}
■ ^{Automotive Safety Applications}
Typical Application
Single-Ended Input Differential Output ADC Driver
LMH^® is a registered trademark of National Semiconductor Corporation.
© 2008 National Semiconductor Corporation 300437
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