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

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).