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 TSH341 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-micron
complementary manufacturing technology to achieve up to 300MHz bandwidth for
only 9.8mA quiescent current.
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 an
excellent choice to drive DAC outputs on 75-ohm video lines. The amplifiers are
input/output negative rail, which allows them to drive the signal to within
60mV of ground – guaranteed by production testing – while operating on a single
5V supply, and enables the video signal to be driven directly from the DAC
output without any transition capacitance.
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. These are essential and easy-to-use
components for high performance video equipment demanding wide bandwidth and
high signal purity. The amplifiers 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 amplifiers are supported by an evaluation board
kit, optimized for high-speed operational amplifiers, which includes a CD-ROM
containing datasheets, application notes, articles and a user manual. They are
available in volume now at a price of $1.50 for quantities of 5,000.
About ST’s Microcontroller, Linear & Discrete Group
STMicroelectronics is a world leader in offering complete system solutions that
leverage its rich portfolio of Microcontroller, Linear, and Discrete
products, advanced process and design technologies, and applications
expertise. This emphasis on solutions allows the Company to minimize
time-to-market for all customers worldwide in existing and emerging
applications.
