Product details

Features Digital Gain Set, Integrated Clamps, Single-ended to Differential conversion PGA/VGA PGA Number of channels 1 Vs (max) (V) 5.25 Vs (min) (V) 4.75 BW at Acl (MHz) 900 Acl, min spec gain (V/V) 0.87 Slew rate (typ) (V/µs) 760 Iq per channel (typ) (mA) 210 Gain (max) (dB) 38.8 Rating Catalog Architecture Fully Differential ADC Driver Operating temperature range (°C) -40 to 85
Features Digital Gain Set, Integrated Clamps, Single-ended to Differential conversion PGA/VGA PGA Number of channels 1 Vs (max) (V) 5.25 Vs (min) (V) 4.75 BW at Acl (MHz) 900 Acl, min spec gain (V/V) 0.87 Slew rate (typ) (V/µs) 760 Iq per channel (typ) (mA) 210 Gain (max) (dB) 38.8 Rating Catalog Architecture Fully Differential ADC Driver Operating temperature range (°C) -40 to 85
WQFN (RGH) 16 16 mm² 4 x 4
  • 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
  • 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

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.

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

Design & development

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GUI for evaluation module (EVM)

SNOC007 LMH6518 GUI Set Up Files

Supported products & hardware

Supported products & hardware

Products
Programmable & variable gain amplifiers (PGAs & VGAs)
LMH6518 900 MHz, Digitally Controlled, Variable Gain Amplifier
Calculation tool

LMH6518DESIGN-CALC — LMH6518 Application Information FS Gain ECM Calculator

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WQFN (RGH) 16 View options

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