900 MHz, Digitally Controlled, Variable Gain Amplifier


Product details


PGA/VGA VGA Number of channels (#) 1 BW @ Acl (MHz) 900 Vs (Max) (V) 5.25 Vs (Min) (V) 4.75 Acl, min spec gain (V/V) 0.87 Gain (Max) (dB) 38.8 Slew rate (Typ) (V/us) 760 Operating temperature range (C) -40 to 85 open-in-new Find other Programmable & variable gain amplifiers (PGA/VGA)

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WQFN (RGH) 16 16 mm² 4 x 4 open-in-new Find other Programmable & variable gain amplifiers (PGA/VGA)


  • Gain Range: 40 dB
  • Gain Step Size: 2 dB
  • Combined Gain Resolution With Gsps ADCs:
    8.5 mdB
  • Minimum Gain: −1.16 dB
  • Maximum Gain: 38.8 dB
  • −3 dB BW: 900 MHz
  • Rise and Fall Time: <500 ps
  • Recovery Time: <5 ns
  • Propagation Delay Variation: 100 ps
  • HD2 at 100 MHz: −50 dBc
  • HD3 at 100 MHz: −53 dBc
  • Input-Referred Noise (Maximum Gain): 0.98 nV/√Hz
  • Overvoltage Clamps for Fast Recovery
  • Power Consumption: Auxiliary Turned Off 1.1 W to 0.75 W
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The LMH6518 device is a digitally controlled variable gain amplifier whose total gain is varied from −1.16 dB to 38.8 dB for a 40 dB range in 2-dB steps. The −3-dB bandwidth is 900 MHz at all gains. Gain accuracy at each setting is typically 0.1 dB. When used in conjunction with TI's Gsample/second (Gsps) ADC with adjustable full-scale (FS) range, the LMH6518 gain adjustment accommodates full scale input signals from 6.8 mVPP to 920 mVPP to get 700 mVPP nominal at the ADC input. The auxiliary output (+OUT AUX and −OUT AUX) follows the main output and is intended for use in oscilloscope trigger function circuitry but may have other uses in other applications.

The LMH6518 gain is programmed through a SPI-1 compatible serial bus. A signal path combined gain resolution of 8.5 mdB is achieved when the device's gain and the Gsps ADC’s FS input are both manipulated. Inputs and outputs are DC-coupled. The outputs are differential with individual common mode (CM) voltage control (for main and auxiliary outputs), and have a selectable bandwidth limiting circuitry (common to both main and auxiliary) of 20, 100, 200, 350, 650, 750 MHz or full bandwidth.

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Technical documentation

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Type Title Date
* Datasheet LMH6518 900 MHz, Digitally Controlled, Variable Gain Amplifier datasheet (Rev. D) Sep. 30, 2016
E-book The Signal e-book: A compendium of blog posts on op amp design topics Mar. 28, 2017
Application note AN-1718 Differential Amplifier Applications Up to 400 MHz (Rev. B) May 01, 2013
Application note AN-1719 Noise Figure Analysis Fully Differential Amplifier (Rev. A) May 01, 2013
User guide AN-1906 LMH6518 Evaluation Board (Rev. B) May 01, 2013
Application note Using High Speed Diff Amp to Drive ADCs (Rev. A) Apr. 26, 2013
More literature Featured High Speed Differential Amplifiers Oct. 23, 2012
Application note A Walk Along the Signal Path (High-Speed Signal Path) Mar. 30, 2005

Design & development

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Hardware development


The LMH6518 evaluation board (part # LMH6518SQEVAL) is designed to aid in the characterization of TI`s High Speed LMH6518 Digitally Controlled Variable Gain Amplifier (DVGA). Use the evaluation board as a guide for high frequency layout and as a tool to aid in device testing and characterization.


Software development

SNOC007.ZIP (425 KB)

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