LMH2832

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Fully-Differential, Dual, 1.1 GHz Digital Variable Gain Amplifier

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Product details

Parameters

2nd harmonic (dBc) 82 3rd harmonic (dBc) 94 @ MHz 100 Acl, min spec gain (V/V) 0.35 Architecture VGA, Fully Differential ADC Driver BW @ Acl (MHz) 1100 Gain (Max) (dB) 30 Gain (Min) (dB) -9 Step size (dB) 1 Iq per channel (Typ) (mA) 105 Product type RF VGA Number of channels (#) 2 Operating temperature range (C) -40 to 85 Total supply voltage (Max) (+5V=5, +/-5V=10) 5.25 Total supply voltage (Min) (+5V=5, +/-5V=10) 4.75 Vs (Min) (V) 4.75 Vs (Max) (V) 5.25 open-in-new Find other RF VGAs

Package | Pins | Size

VQFN (RHA) 40 36 mm² 6 x 6 open-in-new Find other RF VGAs

Features

  • Dual-Channel, Individual SPI™-Controlled DVGA
  • Single 5-V Supply
  • –3-dB Bandwidth: 1.1 GHz (Max Gain)
  • Flat Bandwidth Response: 300 MHz
  • Channel-to-Channel Gain Matching: ±0.05 dB
  • Channel-to-Channel Phase Matching: ±0.1°
  • Gain:
    • 30 dB to –9 dB
    • 1-dB Steps ±0.2 dB
  • Output Third-Order Intercept Point (OIP3):
    • 43 dBm at 300 MHz
    • 51 dBm at 200 MHz
  • Noise Figure (NF):
    • 6.5 dB (Max Gain) at 300 MHz, ZIN = 150 Ω
  • Adjustable Power Consumption:
    • 90 mA to 108 mA per Channel
  • Power-Saving, Power-Down Feature:
    • IQ < 4.5 mA per Channel
    • Power-Down Pin and SPI Programmability
  • Input Return Loss at 300 MHz:
    • 17 dB (RS = 150 Ω)
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Description

The LMH2832 is a high-linearity, dual-channel, digital variable-gain amplifier (DVGA) for high-speed signal chain and data-acquisition systems. The LMH2832 is optimized to provide high bandwidth, low distortion, and low noise, thus making the device ideally suited as a dual, 14-bit, analog-to-digital converter (ADC) driver. The device consists of one fixed-gain block and one variable attenuator consisting of a total gain of 30 dB with a maximum attenuation of 39 dB. The gain range is from 30 dB to –9 dB in 1-dB gain steps with a gain accuracy of ±0.2 dB. The input impedance can be easily matched to 50-Ω or 75-Ω systems using a 1:3-Ω or 1:2-Ω ratio balun, respectively. The LMH2832 is designed to drive general-purpose ADCs and also meets the requirements for both data over cable service interface specification (DOCSIS) 3.0 32 quadrature amplitude modulation (QAM) carriers and DOCSIS 3.1 wideband orthogonal frequency-division multiplexing (OFDM) systems. With excellent NF (6.5 dB) and linearity, the LMH2832 is designed to perform to within DOCSIS specifications. The quiescent current in the power-down state is less than 5 mA per channel with the typical current consumption during operation at 105 mA per channel.

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Technical documentation

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet LMH2832 Fully Differential, Dual, 1.1-GHz, Digital Variable-Gain Amplifier datasheet (Rev. A) Jul. 18, 2016
White papers The Signal e-book: A compendium of blog posts on op amp design topics Mar. 28, 2017
User guides LMH2832EVM-50 Evaluation Module User's Guide Jun. 30, 2016
User guides LMH2832EVM-75 Evaluation Module User's Guide Jun. 30, 2016

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARDS Download
document-generic User guide
249
Description
The LMH2832EVM-50 evaluation module (EVM) is used to evaluate the dual LMH2832, digitally-controlled variable gain amplifier (DVGA) in a 40-pin VQFN package. The EVM is used to easily demonstrate the functionality and performance of LMH2832 across all the gain settings in a 50-Ω input (...)
Features
  • Configured for 5-V single-supply operation
  • Designed for AC-coupled single-ended 50-Ω input and output connection
  • Interface to the inputs and outputs using SMA connectors
  • USB connector and FTDI USB-to-SPI bus translator chip to successfully program the DVGA gain registers
EVALUATION BOARDS Download
document-generic User guide
249
Description
The LMH2832EVM-75 evaluation module (EVM) is used to evaluate the dual LMH2832, digitally-controlled variable gain amplifier (DVGA) in a 40-pin VQFN package. The EVM is used to easily demonstrate the functionality and performance of LMH2832 across all the gain settings in a 75-Ω input (...)
Features
  • Configured for 5-V single-supply operation
  • Designed for AC-coupled single-ended 75-Ω input and 50-Ω output connection
  • Interface to the inputs using F-connectors and outputs using SMA connectors
  • USB connector and FTDI USB-to-SPI bus translator chip to successfully program the DVGA gain registers
GUIS FOR EVALUATION MODULES (EVM) Download
SLOC338.ZIP (16767 KB)

Design tools & simulation

SIMULATION MODELS Download
SBOJ017A.ZIP (73 KB) - Spice Model
SIMULATION MODELS Download
SBOMA21A.TSC (261 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SBOMA22A.ZIP (8 KB) - TINA-TI Spice Model

Reference designs

REFERENCE DESIGNS Download
Wideband Receiver Reference Design for Upstream DOCSIS 3.1 Applications
TIDA-01378 — This reference design consists of an analog front-end (AFE) signal chain for wideband receiver applications using the LMH2832 digitally controlled variable gain amplifier (DVGA) and ADS54J40 analog-to-digital converter (ADC). The design is primarily targeted for upstream DOCSIS 3.1 receiver (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
VQFN (RHA) 40 View options

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