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Burr-Brown - Variable Gain Amplifier

Numéro de référence VCA2617
Description Variable Gain Amplifier
Fabricant Burr-Brown 
Logo Burr-Brown 





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VCA2617 fiche technique
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VCA2617
Dual, Variable Gain Amplifier
SBOS326 −AUGUST 2005
FEATURES
D INDEPENDENT CHANNEL CONTROLS:
− Gain Range: 48dB
− Clamping Levels
− Post-Gain: 0, +6dB
D LOW NOISE: 4.1nV//Hz
D LOW POWER: 52mW/Channel
D BANDWIDTH: 50MHz
D HARMONIC DISTORTION: −53dBc at 5MHz
D CROSSTALK: −61dB at 5MHz
D 5V SINGLE SUPPLY
D POWER-DOWN MODE
D SMALL QFN-32 PACKAGE (5x5mm)
APPLICATIONS
D MEDICAL AND INDUSTRIAL ULTRASOUND
SYSTEMS
− Suitable for 10-Bit and 12-Bit Systems
D TEST EQUIPMENT
D SONAR
DESCRIPTION
The VCA2617 is a dual-channel, continuously variable,
voltage-controlled gain amplifier well-suited for a variety of
ultrasound systems as well as applications in proximity
detectors and test equipment. The VCA2617 uses a true
variable-gain amplifier architecture, achieving very good
noise performance at low gains, while not sacrificing high gain
distortion performance.
Following a linear-in-dB response, the VCA2617 gain can be
varied over a 48dB range with a 0.2V to 2.3V control voltage.
Two separate high-impedance control inputs allow for a
channel independent variation of the gains. Each channel of
the VCA2617 can be configured to provide a gain range of
−10dB to 38dB, or −16dB to 32dB, depending on the gain
select pin (HG). This post-gain feature allows the user to
optimize the output swing of VCA2617 for a variety of
high-speed analog-to-digital converters (ADC). As a means to
improve system overload recovery time, the VCA2617 also
provides an internal clamping circuitry where an externally
applied voltage sets the desired output clamping level.
The VCA2617 operates on a single +5V supply while
consuming only 52mW per channel. It is available in a small
QFN-32 package (5x5mm).
RELATED PRODUCTS
PART NUMBER
DESCRIPTION
VCA2615
Dual, Low-Noise, Variable-Gain Amplifier with
Preamp
In A+
In A
In B+
In B
VCNTLA
V− I
V− I
VCLMPA
Gain CEXTA
Select A
Clamping
Circuitry
I−V
Clamping
Circuitry
I−V
Out A+
Out A
Out B+
Out B
VCNTLB
VCLMPB
Gain
Select B CEXTB
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments
semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date. Products
conform to specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
Copyright 2005, Texas Instruments Incorporated
www.ti.com

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