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LMH6518

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900 MHz, Digitally Controlled, Variable Gain Amplifier

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Data sheet

LMH6518

ACTIVE
Data sheet Order now

Product details

PGA/VGA PGA Number of channels 1 Vs (min) (V) 4.75 Vs (max) (V) 5.25 Input type Single-ended Output type Differential Interface type Digital Gain Set BW at Acl (MHz) 900 Acl, min spec gain (V/V) 0.875 Voltage gain (min) (V/V) 0.875 Voltage gain (max) (V/V) 87 Gain (max) (dB) 38.8 Architecture Fully Differential ADC Driver Features Integrated Clamps, Single-ended to Differential conversion Input voltage noise (typ) (µV√Hz) 0.000098 Slew rate (typ) (V/µs) 760 Iq per channel (typ) (mA) 210 Rating Catalog Operating temperature range (°C) -40 to 85
PGA/VGA PGA Number of channels 1 Vs (min) (V) 4.75 Vs (max) (V) 5.25 Input type Single-ended Output type Differential Interface type Digital Gain Set BW at Acl (MHz) 900 Acl, min spec gain (V/V) 0.875 Voltage gain (min) (V/V) 0.875 Voltage gain (max) (V/V) 87 Gain (max) (dB) 38.8 Architecture Fully Differential ADC Driver Features Integrated Clamps, Single-ended to Differential conversion Input voltage noise (typ) (µV√Hz) 0.000098 Slew rate (typ) (V/µs) 760 Iq per channel (typ) (mA) 210 Rating Catalog Operating temperature range (°C) -40 to 85
WQFN (RGH) 16 16 mm² (4 mm × 4 mm)
  • Gain range: 40dB
  • Gain step size: 2dB
  • Combined gain resolution with GSPS ADCs: 8.5mdB
  • Minimum gain: −1.16dB
  • Maximum gain: 38.8dB
  • −3dB bandwidth (BW): 900MHz
  • Rise and fall time: < 500ps
  • Recovery time: < 5ns
  • Propagation delay variation: 100ps
  • HD2 at 100MHz: −50dBc
  • HD3 at 100MHz: −53dBc
  • Input-referred noise (maximum gain): 0.98nV/√Hz
  • Overvoltage clamps for fast recovery
  • Power consumption: auxiliary turned off 1.1W to 0.75W
  • Gain range: 40dB
  • Gain step size: 2dB
  • Combined gain resolution with GSPS ADCs: 8.5mdB
  • Minimum gain: −1.16dB
  • Maximum gain: 38.8dB
  • −3dB bandwidth (BW): 900MHz
  • Rise and fall time: < 500ps
  • Recovery time: < 5ns
  • Propagation delay variation: 100ps
  • HD2 at 100MHz: −50dBc
  • HD3 at 100MHz: −53dBc
  • Input-referred noise (maximum gain): 0.98nV/√Hz
  • Overvoltage clamps for fast recovery
  • Power consumption: auxiliary turned off 1.1W to 0.75W

The LMH6518 is a digitally controlled variable gain amplifier with a total gain that varies from –1.16dB to 38.8dB for a 40dB range in 2dB steps. The −3dB bandwidth is 900MHz at all gains. Gain accuracy at each setting is typically 0.1dB. When used in conjunction with TI’s gigasamples per second (GSPS) ADC with adjustable full-scale range, the LMH6518 gain adjustment accommodates full scale input signals from 6.8mVPP to 920mVPP to get 700mVPP 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 can have other uses in other applications.

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

The LMH6518 is a digitally controlled variable gain amplifier with a total gain that varies from –1.16dB to 38.8dB for a 40dB range in 2dB steps. The −3dB bandwidth is 900MHz at all gains. Gain accuracy at each setting is typically 0.1dB. When used in conjunction with TI’s gigasamples per second (GSPS) ADC with adjustable full-scale range, the LMH6518 gain adjustment accommodates full scale input signals from 6.8mVPP to 920mVPP to get 700mVPP 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 can have other uses in other applications.

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

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Top documentation Type Title Format options Date
* Data sheet LMH6518 900MHz, Digitally Controlled Variable Gain Amplifier datasheet (Rev. E) PDF | HTML Jul 31, 2024
E-book The Signal e-book: A compendium of blog posts on op amp design topics PDF | HTML Mar 28, 2017
Application note AN-1719 Noise Figure Analysis Fully Differential Amplifier (Rev. A) May 1, 2013
Application note AN-1718 Differential Amplifier Applications Up to 400 MHz (Rev. B) May 1, 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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Evaluation board

LMH6518EVM — LMH6518 evaluation module

The LMH6518 evaluation module (EVM) is designed to aid in the characterization of the LMH6518 differential amplifier. The easy-to-use evaluation board is designed to provide a quick setup and offer high performance signal analysis. The EVM is ready to connect to power supplies, signal source and (...)
User guide: PDF | HTML
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GUI for evaluation module (EVM)

SNOC007 — LMH6518 GUI Set Up Files

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Calculation tool

LMH6518DESIGN-CALC — LMH6518 Application Information FS Gain ECM Calculator

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Reference design

TIDA-010133 — High-impedance, 500MHz bandwidth, oscilloscope analog front-end reference design

High Bandwidth data acquisition systems, like a digital storage oscilloscope (DSO), require the analog front-end (AFE) signal chain to have wide (-3dB) bandwidth to measure a wide range of signals, optional high input impedance to prevent loading of the measured signal, low noise to prevent (...)
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WQFN (RGH) 16 Ultra Librarian
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