Dual Variable-Gain Amplifier With Low Noise Pre-Amp


Product details


PGA/VGA VGA Number of channels (#) 2 BW @ Acl (MHz) 40 Vs (Max) (V) 5.25 Vs (Min) (V) 4.75 Acl, min spec gain (V/V) 8 Gain (Max) (dB) 53 Slew rate (Typ) (V/us) 300 Operating temperature range (C) -40 to 85 open-in-new Find other Programmable & variable gain amplifiers (PGA/VGA)

Package | Pins | Size

TQFP (PFB) 48 81 mm² 9 x 9 open-in-new Find other Programmable & variable gain amplifiers (PGA/VGA)


    • Low Input Noise: 1.25nV/Hz
    • Active Termination Noise Reduction
    • Switchable Termination Value
    • 80MHz Bandwidth
    • 5dB to 25dB Gain Range
    • Differential Input /Output
    • Low Noise VCA: 3.3nV/Hz, Differential Programming Optimizes Noise Figure
    • 24dB to 45dB Gain
    • 40MHz Bandwidth
    • Differential Input /Output
  • LOW CROSSTALK: 52dB at Max Gain, 5MHz
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The VCA2612 is a highly integrated, dual receive channel, signal processing subsystem. Each channel of the product consists of a low noise preamplifier (LNP) and a Variable Gain Amplifier (VGA). The LNP circuit provides the necessary connections to implement Active Termination (AT), a method of cable termination which results in up to 4.6dB noise figure improvement. Different cable termination characteristics can be accommodated by utilizing the VCA2612\x92s switchable LNA feedback pins. The LNP has the ability to accept both differential and single-ended inputs, and generates a differential output signal. The LNP provides strappable gains of 5dB, 17dB, 22dB, and 25dB.

The output of the LNP can be accessed externally for further signal processing, or fed directly into the VGA. The VCA2612\x92s VGA section consists of two parts: the Voltage Controlled Attenuator (VCA) and the Programmable Gain Amplifier (PGA). The gain and gain range of the PGA can be digitally programmed. The combination of these two programmable elements results in a variable gain ranging from 0dB up to a maximum gain as defined by the user through external connections. The output of the VGA can be used in either a single-ended or differential mode to drive high-performance Analog-to-Digital (A/D) converters.

The VCA2612 also features low crosstalk and outstanding distortion performance. The combination of low noise and gain range programmability make the VCA2612 a versatile building block in a number of applications where noise performance is critical. The VCA2612 is available in a TQFP-48 package.

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Technical documentation

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Type Title Date
* Datasheet VCA2612: Dual, Variable Gain Amplifier with Low Noise Preamp datasheet (Rev. C) Apr. 08, 2004
Application note Dual-Channel VCAs: Methods for Powering Down One Channel Jun. 11, 2004
User guide VCA261xEVM User's Guide (Rev. A) Aug. 21, 2003
Application note AB-170: Ultrasound Processor Supplementary Material Jan. 25, 2001

Design & development

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Hardware development


The VCA2611 is a dual, variable gain amplifier including a low-noise preamplifier (LNP). The VCA2611EVM evaluation module is designed to provide a complete evaluation platform for the VCA2611. The user can apply the input signal either to the LNP, or directly to the VCA section. The differential (...)

  • Fully assembeled evaluation board for the VCA2611
  • Single-ended input configuration for the LNP
  • Transformer coupled, single-ended input for the VCA
  • Adjustable gain range

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TQFP (PFB) 48 View options

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