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TI gain amplifier targets industrial scanning apps

Posted: 17 Dec 2003 ?? ?Print Version ?Bookmark and Share

Keywords:texas instruments? variable gain amplifier? burr-brown? vca8613? ads5121?

Texas Instruments Inc. (TI) has announced an eight-channel, low-noise variable gain amplifier from the company's Burr-Brown product line which is designed for medical and industrial imaging applications, such as portable ultrasound and industrial scanning.

The VCA8613 incorporates eight low-noise preamplifiers (LNAs), eight attenuators and eight post-gain amplifiers. Drawing 600mW (75mW/channel), the device is one of the lowest power solution in the market. It operates on a single 3V supply and features 1.2nV/rtHz input voltage noise at 5MHz.

Each channel of the octal VCA8613 consists of a LNA, a voltage-controlled attenuator (VCA) and a programmable gain amplifier (PGA). The differential outputs of the LNAs can be switched through the 8 x 10 cross-point switch, which is programmable through the serial interface input port. The output of the LNA is fed directly into the VGA.

The gain range of the PGA can be digitally configured separately and the gain can be varied between two discrete settings of 21dB and 26dB. The VCA has four programmable maximum attenuation settings (29-, 33-, 36.5- and 40dB). The output of the PGA feeds directly into an integrated two-pole, low-pass filter, allowing direct connection to a differential input analog-to-digital converter, such as the company?s ADS5121 and ADS5122.

The VCA8613 features an integrated continuous wave (CW) processor, which allows a reduction in the number of external components required to support the CW Doppler mode. Offered in a TQFP-64 package, it is available for $25.40 in 1,000-piece quantities. Evaluation modules are also available.

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