VCA2617
SBOS326 −AUGUST 2005
Dual, Variable Gain Amplifier
FD EATURES
DESCRIPTION
INDEPENDENT CHANNEL CONTROLS:
− Gain Range: 48dB
− Clamping Levels
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.
− Post-Gain: 0, +6dB
D
D
D
D
D
D
D
D
LOW NOISE: 4.1nV//Hz
LOW POWER: 52mW/Channel
BANDWIDTH: 50MHz
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.
HARMONIC DISTORTION: −53dBc at 5MHz
CROSSTALK: −61dB at 5MHz
5V SINGLE SUPPLY
POWER-DOWN MODE
SMALL QFN-32 PACKAGE (5x5mm)
AD PPLICATIONS
MEDICAL AND INDUSTRIAL ULTRASOUND
SYSTEMS
The VCA2617 operates on a single +5V supply while
consuming only 52mW per channel. It is available in a small
QFN-32 package (5x5mm).
− Suitable for 10-Bit and 12-Bit Systems
D
D
TEST EQUIPMENT
SONAR
RELATED PRODUCTS
PART NUMBER
DESCRIPTION
VCA2615
Dual, Low-Noise, Variable-Gain Amplifier with
Preamp
Gain
C
Select A
A
EXT
V
A
V
A
CLMP
CNTL
Out A+
In A+
Clamping
Circuitry
V−I
I−V
−
Out A
−
In A
Out B+
In B+
Clamping
Circuitry
V−I
I−V
−
Out B
−
In B
V
B
V
B
CLMP
Gain
CNTL
C
B
EXT
Select B
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semiconductor products and disclaimers thereto appears at the end of this data sheet.
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