Product details

Features Analog Gain Set, Digital Gain Set, Shutdown PGA/VGA VGA Number of channels 2 Vs (max) (V) 5.25 Vs (min) (V) 4.75 BW at Acl (MHz) 42 Acl, min spec gain (V/V) 2.8 Slew rate (typ) (V/µs) 100 Gain (max) (dB) 61 Rating Catalog Operating temperature range (°C) -40 to 85
Features Analog Gain Set, Digital Gain Set, Shutdown PGA/VGA VGA Number of channels 2 Vs (max) (V) 5.25 Vs (min) (V) 4.75 BW at Acl (MHz) 42 Acl, min spec gain (V/V) 2.8 Slew rate (typ) (V/µs) 100 Gain (max) (dB) 61 Rating Catalog Operating temperature range (°C) -40 to 85
TQFP (PFB) 48 81 mm² 9 x 9 VQFN (RGZ) 48 49 mm² 7 x 7
  • VERY LOW NOISE: 0.7nV/Hz
  • LOW-NOISE PREAMP (LNP)
    • Active Termination
    • Programmable Gains: 3, 12, 18, 22dB
    • Programmable Input Impedance (RF)
    • Buffered, Differential Outputs for CW Processing
    • Excellent Input Signal Handling Capabilities
  • LOW-NOISE VARIABLE-GAIN AMPLIFIER
    • High/Low-Mode (0/+6dB)
    • 52dB Gain Control Range
    • Linear Control Response: 22dB/V
    • Switchable Differential Inputs
    • Adjustable Output Clipping-Level
  • BANDWIDTH: 42MHz
  • HARMONIC DISTORTION: –55dB
  • 5V SINGLE SUPPLY
  • LOW-POWER: 154mW/Channel
  • POWER-DOWN MODES
  • APPLICATIONS
    • MEDICAL AND INDUSTRIAL ULTRASOUND SYSTEMS
      • Suitable for 10-Bit and 12-Bit Systems
    • TEST EQUIPMENT

All trademarks are the property of their respective owners.

  • VERY LOW NOISE: 0.7nV/Hz
  • LOW-NOISE PREAMP (LNP)
    • Active Termination
    • Programmable Gains: 3, 12, 18, 22dB
    • Programmable Input Impedance (RF)
    • Buffered, Differential Outputs for CW Processing
    • Excellent Input Signal Handling Capabilities
  • LOW-NOISE VARIABLE-GAIN AMPLIFIER
    • High/Low-Mode (0/+6dB)
    • 52dB Gain Control Range
    • Linear Control Response: 22dB/V
    • Switchable Differential Inputs
    • Adjustable Output Clipping-Level
  • BANDWIDTH: 42MHz
  • HARMONIC DISTORTION: –55dB
  • 5V SINGLE SUPPLY
  • LOW-POWER: 154mW/Channel
  • POWER-DOWN MODES
  • APPLICATIONS
    • MEDICAL AND INDUSTRIAL ULTRASOUND SYSTEMS
      • Suitable for 10-Bit and 12-Bit Systems
    • TEST EQUIPMENT

All trademarks are the property of their respective owners.

The VCA2615 is a dual-channel, variable gain amplifier consisting of a Low-Noise Preamplifier (LNP) and a Variable-Gain Amplifier (VGA). This combination along with the device features makes it well-suited for a variety of ultrasound systems.

The LNP offers a high level of flexibility to adapt to a wide range of systems and probes. The LNP gain can be programmed to one of four settings (3dB, 12dB, 18dB, 22dB), while maintaining excellent noise and signal handling characteristics. The input impedance of the LNP can be controlled by selecting one of the built-in feedback resistors. This active termination allows the user to closely match the LNP to a given source impedance, resulting in optimized overall system noise performance. The differential LNP outputs are provided either as buffered outputs for further CW processing, or fed directly into the variable-gain amplifier (VGA). Alternatively, an external signal can be applied to the differential VGA inputs through a programmable switch.

Following a linear-in-dB response, the gain of the VGA can be varied over a 52dB range with a 0.2V to 2.5V control voltage common to both channels of the VCA2615. In addition, the overall gain can be switched between a 0dB and +6dB postgain, allowing the user to optimize the output swing of VCA2615 for a variety of high-speed Analog-to-Digital Converters (ADCs). As a means to improve system overload recovery time, the VCA2615 provides an internal clipping function where an externally applied voltage sets the desired clipping level.

The VCA2615 operates on a single +5V supply and is available in a small QFN-48 (7×7mm) or TQFP package.

The VCA2615 is a dual-channel, variable gain amplifier consisting of a Low-Noise Preamplifier (LNP) and a Variable-Gain Amplifier (VGA). This combination along with the device features makes it well-suited for a variety of ultrasound systems.

The LNP offers a high level of flexibility to adapt to a wide range of systems and probes. The LNP gain can be programmed to one of four settings (3dB, 12dB, 18dB, 22dB), while maintaining excellent noise and signal handling characteristics. The input impedance of the LNP can be controlled by selecting one of the built-in feedback resistors. This active termination allows the user to closely match the LNP to a given source impedance, resulting in optimized overall system noise performance. The differential LNP outputs are provided either as buffered outputs for further CW processing, or fed directly into the variable-gain amplifier (VGA). Alternatively, an external signal can be applied to the differential VGA inputs through a programmable switch.

Following a linear-in-dB response, the gain of the VGA can be varied over a 52dB range with a 0.2V to 2.5V control voltage common to both channels of the VCA2615. In addition, the overall gain can be switched between a 0dB and +6dB postgain, allowing the user to optimize the output swing of VCA2615 for a variety of high-speed Analog-to-Digital Converters (ADCs). As a means to improve system overload recovery time, the VCA2615 provides an internal clipping function where an externally applied voltage sets the desired clipping level.

The VCA2615 operates on a single +5V supply and is available in a small QFN-48 (7×7mm) or TQFP package.

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Technical documentation

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Type Title Date
* Data sheet Dual, Low-Noise Variable-Gain Amplifier with Preamp datasheet (Rev. D) 06 May 2008
User guide Ultrasound Receive Chain Demonstration Platform User's Guide 16 Dec 2005
EVM User's guide VCA2615EVM User's Guide 25 Oct 2005

Design & development

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

Evaluation board

VCA2615EVM — VCA2615 evaluation module

The VCA2615 is a dual-channel, variable gain amplifier, combining a low-noise preamplifier (LNP) and a voltage-controlled amplifier. The VCA2615EVM evaluation module is designed to allow for a quick setup and ease of use in evaluating the performance. Various modes of operation can be configured, (...)

User guide: PDF
Not available on TI.com
Simulation model

VCA2615 TINA-TI Reference Design

SBOM790.TSC (883 KB) - TINA-TI Reference Design
Simulation model

VCA2615 TINA-TI Spice Model

SBOM791.ZIP (32 KB) - TINA-TI Spice Model
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
User guide: PDF
Package Pins Download
TQFP (PFB) 48 View options
VQFN (RGZ) 48 View options

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