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VCA2617-VCA2617RHBR-VCA2617RHBT
2-Channel Variable Gain Amplifier
FEATURES INDEPENDENT CHANNEL CONTROLS:
− Gain Range: 48dB
− Clamping Levels
− Post-Gain: 0, +6dB LOW NOISE: 4.1nV/�Hz LOW POWER: 52mW/Channel BANDWIDTH: 50MHz HARMONIC DISTORTION: −53dBc at 5MHz CROSSTALK: −61dB at 5MHz 5V SINGLE SUPPLY POWER-DOWN MODE SMALL QFN-32 PACKAGE (5x5mm)
APPLICATIONS MEDICAL AND INDUSTRIAL ULTRASOUND
SYSTEMS
− Suitable for 10-Bit and 12-Bit Systems TEST EQUIPMENT SONAR
DESCRIPTIONThe 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 PRODUCTSVCNTLB Gain
SelectB CEXTBVCLMPB
OutB−
OutA+
OutA−
InA−
InA+
InB−
InB+
VCNTLA VCLMPA
Gain
SelectA
CEXTA
OutB+
VCA2617SBOS326 −AUGUST 2005
Dual, V ariable Gain Amplifier
