VCA2612

ACTIVE

Dual Variable-Gain Amplifier With Low Noise Pre-Amp

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Product details

Parameters

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)

Features

  • LOW NOISE PREAMP:
    • 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 VARIABLE GAIN AMPLIFIER:
    • 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
  • HIGH-SPEED VARIABLE GAIN ADJUST
  • SWITCHABLE EXTERNAL PROCESSING
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Description

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

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

Design & development

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Hardware development

EVALUATION BOARDS Download
document-generic User guide
99
Description

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 (...)

Features
  • 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

Design tools & simulation

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 (...)
document-generic User guide

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Package Pins Download
TQFP (PFB) 48 View options

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