Product details

PGA/VGA VGA Number of channels (#) 1 BW @ Acl (MHz) 710 Vs (Max) (V) 12 Vs (Min) (V) 8 Acl, min spec gain (V/V) 2 Gain (Max) (dB) 40 Slew rate (Typ) (V/us) 2500 Operating temperature range (C) -40 to 85 Features Analog Gain Set, Differential to Single-ended conversion
PGA/VGA VGA Number of channels (#) 1 BW @ Acl (MHz) 710 Vs (Max) (V) 12 Vs (Min) (V) 8 Acl, min spec gain (V/V) 2 Gain (Max) (dB) 40 Slew rate (Typ) (V/us) 2500 Operating temperature range (C) -40 to 85 Features Analog Gain Set, Differential to Single-ended conversion
SOIC (D) 14 52 mm² 8.65 x 6 VSSOP (DGS) 10 9 mm² 3 x 3
  • 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
  • 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

The VCA824 is a DC-coupled, wideband, linear-in V/V, continuously variable, voltage-controlled gain amplifier. The device 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 VCA824 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 2 V/V and 40 V/V. Operating from ±5-V supplies, the gain control voltage for the VCA824 adjusts the gain linearly in V/V as the control voltage varies from 1 V to –1 V. For example, set for a maximum gain of 10 V/V, the VCA824 provides 10 V/V, at 1-V input, to 0.1 V/V at –1-V input of gain control range. The VCA824 offers excellent gain linearity. For a 20-dB maximum gain, and a gain-control input voltage varying between 0 V and 1 V, the gain does not deviate by more than ±0.3-dB (maximum at 25°C).

The VCA824 is a DC-coupled, wideband, linear-in V/V, continuously variable, voltage-controlled gain amplifier. The device 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 VCA824 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 2 V/V and 40 V/V. Operating from ±5-V supplies, the gain control voltage for the VCA824 adjusts the gain linearly in V/V as the control voltage varies from 1 V to –1 V. For example, set for a maximum gain of 10 V/V, the VCA824 provides 10 V/V, at 1-V input, to 0.1 V/V at –1-V input of gain control range. The VCA824 offers excellent gain linearity. For a 20-dB maximum gain, and a gain-control input voltage varying between 0 V and 1 V, the gain does not deviate by more than ±0.3-dB (maximum at 25°C).

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Technical documentation

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Type Title Date
* Data sheet VCA824 Ultra-Wideband, > 40-dB Gain Adjust Range, Linear in V/V Variable Gain Amplifier datasheet (Rev. E) 22 Jul 2019
E-book The Signal e-book: A compendium of blog posts on op amp design topics 28 Mar 2017
Application note Analog Applications Journal 2Q 2015 28 Apr 2015
Application note Tips and tricks for high-speed, high-voltage measurement 28 Apr 2015
Application note Implementating a Variable-Length Cat5e Cable Equalizer 25 Apr 2010
Application note Wireline Data Transmission and Reception 27 Jan 2010
User guide Voltage-Controlled Amplifier Evaluation Kit 25 Aug 2008

Design & development

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Evaluation board

DEM-VCA-MSOP-1A — DEM-VCA-MSOP-1A

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Evaluation board

DEM-VCA-SO-1B — DEM-VCA-SO-1B

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Simulation model

VCA824 PSpice Model (Rev. A)

SBOM362A.ZIP (45 KB) - PSpice Model
Simulation model

VCA824 TINA-TI Reference Design

SBOM363.TSC (56 KB) - TINA-TI Reference Design
Simulation model

VCA824 TINA-TI Spice Model

SBOM364.TSM (19 KB) - TINA-TI Spice Model
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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 (...)
Simulation tool

TINA-TI — SPICE-based analog simulation program

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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SOIC (D) 14 View options
VSSOP (DGS) 10 View options

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