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Product details

Parameters

PGA/VGA VGA Number of channels (#) 1 BW @ Acl (MHz) 710 Vs (Max) (V) 12 Vs (Min) (V) 7 Acl, min spec gain (V/V) 2 Gain (Max) (dB) 40 Slew rate (Typ) (V/us) 2500 Operating temperature range (C) -40 to 85 open-in-new Find other Programmable & variable gain amplifiers (PGA/VGA)

Package | Pins | Size

SOIC (D) 14 52 mm² 8.65 x 6 VSSOP (DGS) 10 9 mm² 3 x 3 open-in-new Find other Programmable & variable gain amplifiers (PGA/VGA)

Features

  • 710-MHz Small-Signal Bandwidth
    (G = +2 V/V)
  • 320 MHz, 4 VPP Bandwidth (G = +10 V/V)
  • 0.1-dB Gain Flatness to 135 MHz
  • 2500 V/µs Slew Rate
  • > 40-dB Gain Adjust Range
  • High Gain Accuracy: 20 dB ±0.3 dB
  • High Output Current: ±90 mA
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Description

The VCA821 device is a DC-coupled, wideband, linear in dB, continuously variable, voltage-controlled gain amplifier. It provides a differential input to single-ended conversion with a high-impedance gain control input used to vary the gain down 40 dB from the nominal maximum gain set by the gain resistor (RG) and feedback resistor (RF).

The VCA821 device internal architecture consists of two input buffers and an output current feedback amplifier stage integrated with a multiplier core to provide a complete variable gain amplifier (VGA) system that does not require external buffering. The maximum gain is set externally with two resistors, providing flexibility in designs. The maximum gain is intended to be set between 6 dB and 32 dB. Operating from ±5-V supplies, the gain control voltage for the VCA821 device adjusts the gain linearly in dB as the control voltage varies from 0V to +2 V. For example, set at a maximum gain of 20 dB, the VCA821 device provides 20 dB, at VG = +2 V, to less than –20 dB at VG = 0 V. The VCA821 device offers excellent gain linearity. For a 20-dB maximum gain, and a gain-control input voltage varying between +1 V and +2 V, the gain does not deviate by more than ±0.3 dB (maximum at +25°C).

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 4
Type Title Date
* Datasheet VCA821 Ultra-Wideband, > 40-dB Gain Adjust Range, Linear in dB Variable Gain Amplifier datasheet (Rev. D) May 24, 2016
White papers The Signal e-book: A compendium of blog posts on op amp design topics Mar. 28, 2017
Application notes Implementating a Variable-Length Cat5e Cable Equalizer Apr. 25, 2010
Application notes Wireline Data Transmission and Reception Jan. 27, 2010

Design & development

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

Hardware development

EVALUATION BOARDS Download
DEM-VCA-MSOP-1A
DEM-VCA-MSOP-1A
document-generic User guide
5
Features
  • Free
  • Unpopulated demonstration fixture
EVALUATION BOARDS Download
DEM-VCA-SO-1B
DEM-VCA-SO-1B
document-generic User guide
5
Features
  • Free
  • Unpopulated demonstration fixture

Design tools & simulation

SIMULATION MODELS Download
SBOM365.ZIP (4 KB) - PSpice Model
SIMULATION MODELS Download
SBOM366.TSC (52 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SBOM367.TSM (19 KB) - TINA-TI Spice Model
SIMULATION TOOLS Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
SIMULATION TOOLS Download
SPICE-based analog simulation program
TINA-TI TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
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CAD/CAE symbols

Package Pins Download
SOIC (D) 14 View options
VSSOP (DGS) 10 View options

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