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LMH6518
www.ti.com
SNOSB21A – MAY 2008 – REVISED OCTOBER 2008
LMH6518 900 MHz, Digitally Controlled, Variable Gain Amplifier
Check for Samples: LMH6518
1
FEATURES
DESCRIPTION
The LMH6518 is a digitally controlled variable gain
2
Gain Range 40 dB
amplifier whose total gain can be varied from
−1.16
Gain Step Size 2 dB
dB to 38.8 dB for a 40 dB range in 2 dB steps. The
Combined Gain Resolution with
−3 dB bandwidth is 900 MHz at all gains. Gain
Gsample/Second ADC’s 8.5 mdB
accuracy at each setting is typically 0.1 dB. When
used in conjunction with a National Semiconductor
Min Gain
−1.16 dB
Gsample/second (Gsps) ADC with adjustable full
Max Gain 38.8 dB
scale (FS) range, the LMH6518 gain adjustment will
−3 dB BW 900 MHz
accommodate full scale input signals from 6.8 mVPP
to 920 mVPP to get 700 mVPP nominal at the ADC
Rise/Fall Time <500 ps
input. The Auxiliary output (“+OUT Aux” and “
−OUT
Recovery Time <5 ns
Aux”) follows the Main output and is intended for use
Propagation Delay Variation 100 ps
in Oscilloscope trigger function circuitry but may have
other uses in other applications.
HD2 @ 100 MHz
−50 dBc
HD3 @ 100 MHz
−53 dBc
The LMH6518 gain is programmed via a SPI-1
compatible serial bus. A signal path combined gain
Input-Referred Noise (Max Gain) 0.98 nV/
√Hz
resolution of 8.5 mdB can be achieved when the
Over-Voltage Clamps for Fast Recovery
LMH6518’s gain and the Gsps ADC’s FS input are
Power Consumption
— Auxiliary Turned Off
both manipulated. Inputs and outputs are DC-
1.1W0.75W
coupled. The outputs are differential with individual
Common Mode (CM) voltage control (for Main and
Auxiliary outputs) and have a selectable bandwidth
APPLICATIONS
limiting circuitry (common to both Main and Auxiliary)
Oscilloscope Programmable Gain Amplifier
of 20, 100, 200, 350, 650, 750 MHz or full bandwidth.
Differential ADC Drivers
High Frequency Single-Ended Input to
Differential Conversion
Precision Gain Control Applications
Medical Applications
RF/IF Applications
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2008, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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