VCA2617

www.datasheet4u.com VCA2617 SBOS326 −AUGUST 2005 Dual, Variable Gain Amplifier FEATURES D INDEPENDENT CHANNEL CONTROLS: − Gain Range: 48dB − Clamping Levels − Post-Gain: 0, +6dB 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). D D D D D D D D LOW NOISE: 4.1nV//Hz LOW POWER: 52mW/Channel BANDWIDTH: 50MHz HARMONIC DISTORTION: −53dB...