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'Cost-effective' video amps for HDTV, medical imaging apps

Posted: 15 Mar 2006 ?? ?Print Version ?Bookmark and Share

Keywords:STMicroelectronics? ST? TSH340? TSH341?

STMicroelectronics (ST) announced two new 300MHz amplifiers designed to drive very high-definition signals on 75-ohm video lines in high-end industrial and medical imaging systems, and in HDTV-enabled STBs and DVD players. The cost-effective TSH340 and TSH341 video amplifiers feature operation on a single 3V to 5V single power supply, with the capability to drive the video signal very close to zero volts.

According to the press release, the TSH340 is a buffer with internal gain, providing savings both on board space and in the number of components; the gain is set at 6dB to allow the right level of video signal while maintaining good line matching. The TSH34, on the other hand, is an op amp that uses the same voltage feedback architecture as the TSH340, but allows the gain to be set externally. Both use a very high-speed 0.25?m complementary manufacturing technology to achieve up to 300MHz bandwidth for only 9.8mA quiescent current, ST said.

In addition, high slew rates, low distortion and a gain flatness of 65MHz, combined with a low input-voltage noise of 7nV/sqrtHz, make the TSH340 and TSH341 devices suitable to drive DAC outputs on 75-ohm video lines. The amps are input/output negative rail, which allows them to drive the signal to within 60mV of ground while operating on a single 5V supply, and enables the video signal to be driven directly from the DAC output without any transition capacitance.

ST added that the use of a single power supply, eliminating the need for the negative supply that is usually required, reduces the complexity of applications using the devices and so reduces costs. The amps are specified for both 150-ohm and 100-ohm loads, and are supplied in the tiny SOT23-5 and SO8 plastic packages.

The TSH340 and TSH341 video amps are supported by an evaluation board kit, designed for high-speed operational amplifiers, which includes a CD-ROM containing datasheets, application notes, articles and a user manual. The new amps are available in volume orders at $1.50 for quantities of 5,000.

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