资 源 简 介
The VCA8500 is an 8-channel variable gain amplifier consisTIng of a low-noise pre-amplifier (LNP) and a variable-gain amplifier (VGA). This combinaTIon, along with the device features, makes it ideal for a variety of ultrasound systems.
The LNP gain is fixed at 20dB, and has excellent noise and signal handling characterisTIcs. The gain of the voltage-controlled attenuator can vary over a 46dB range with a 0V to 1.2V control voltage common to all channels of the VCA8500.
The post-gain amplifier (PGA) can be programmed for four gain setTIngs: 20dB, 25dB, 27dB, or 30dB gain. As a means to improve system overload recovery time, the VCA8500 provides an internal clamping function. The PGA settings as well the clamp levels are controlled through the serial interface.
