LMH6518

ACTIVO

Amplificador de ganancia variable, 900 MHz y control digital

Detalles del producto

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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Documentación técnica

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Documentación principal Tipo Título Opciones de formato Descargar la versión más reciente en inglés Fecha
* Hoja de datos LMH6518 900MHz, Digitally Controlled Variable Gain Amplifier datasheet (Rev. E) PDF | HTML 31/07/2024
Libro electrónico The Signal e-book: A compendium of blog posts on op amp design topics PDF | HTML 28/03/2017
Nota sobre la aplicación AN-1719 Noise Figure Analysis Fully Differential Amplifier (Rev. A) 1/05/2013
Nota sobre la aplicación AN-1718 Differential Amplifier Applications Up to 400 MHz (Rev. B) 1/05/2013
Nota sobre la aplicación Using High Speed Diff Amp to Drive ADCs (Rev. A) 26/04/2013
Más documentación Featured High Speed Differential Amplifiers 23/10/2012
Nota sobre la aplicación A Walk Along the Signal Path (High-Speed Signal Path) 30/03/2005

Diseño y desarrollo

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Placa de evaluación

LMH6518EVM — Módulo de evaluación LMH6518

El módulo de evaluación (EVM) LMH6518 está diseñado para ayudar en la caracterización del amplificador diferencial LMH6518. La placa de evaluación fácil de usar está diseñada para proporcionar una configuración rápida y ofrecer un análisis de señal de alto rendimiento. El EVM está listo para (...)
Guía del usuario: PDF | HTML
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GUI para el módulo de evaluación (EVM)

SNOC007 — LMH6518 GUI Set Up Files

Productos y hardware compatibles
Herramienta de cálculo

LMH6518DESIGN-CALC — Calculadora ECM LMH6518 de ganancia FS de información de aplicación

Productos y hardware compatibles
Diseño de referencia

TIDA-010133 — Diseño de referencia de interfaz analógica de osciloscopio de ancho de banda de 500 MHz de alta impe

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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Encapsulado Pines Símbolos CAD, huellas y modelos 3D
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Pedidos y calidad

Soporte y capacitación

Foros de TI E2E™ con asistencia técnica de los ingenieros de TI

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