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TI amplifiers mix high-gain adjust range, low noise

Posted: 01 Nov 2004 ?? ?Print Version ?Bookmark and Share

Keywords:texas instruments? ti? amplifier? burr-brown? vca810?

Texas Instruments Inc. (TI) introduced a wideband, voltage-controlled amplifier from its Burr-Brown product line.

Featuring a continuously variable 80dB gain adjust range, 0.5dB gain accuracy, and a constant 35MHz signal bandwidth, the new VCA810 amplifier provides a differential input to single ended output amplifier primarily used for analog signal processing in pulse or time domain systems.

"The VCA810 combines high-gain adjust range, low noise, high bandwidth and unmatched gain accuracy, making it ideal for pulse-oriented signal paths requiring a gain normalization prior to further processing," shared Michael Steffes, strategic marketing manager of TI's high-speed signal processing group.

Additionally, the device operates from 5V supplies with low input voltage noise (2.4nV/rtHz), low supply current (24.8mA) and high output current (60mA). Since the VCA810 offers a precisely trimmed dB/V gain adjust characteristic, AGC loops can use the gain control voltage as a received signal strength indicator with excellent accuracy.

When the product is used to equalize varying channel loss, minimal change in group delay over gain setting will retain critical pulse edge information. An improved output stage provides adequate output current to drive the most demanding loads, TI said.

Housed in an SO-8 package, the VCA810 has a suggested resale price of $5.75 in 1,000-piece quantities. A companion product, VCA811, offers a wider 80MHz signal bandwidth and will be available in 1Q 2005.

Target applications for the VCA810 include optical receiver time gain control and distance measurement, sonar systems, voltage-tunable active filters, log amp functions and differential receivers.

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