Single-supply 300 MHz amplifiers drive high-definition video signals

18 April 2007 Analogue, Mixed Signal, LSI

STMicroelectronics offers two 300 MHz amplifiers designed to drive very high-definition signals on 75 Ω video lines in high-end industrial and medical imaging systems, and in set-top boxes and DVD players. The TSH340 and TSH341 video amplifiers feature operation on a 3 V to 5 V single power supply, with the capability to drive the video signal very close to zero volts.

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 6 dB 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 μm technology to achieve up to 300 MHz bandwidth for only 9,8 mA quiescent current.

High slew rates, low distortion and a gain flatness of 65 MHz, combined with a low input-voltage noise of 7 nV/sqrt.Hz, are features that make the TSH340/1 devices a good choice to drive DAC outputs on 75 Ω video lines. The amplifiers are input/output negative rail, which allows them to drive the signal to within 60 mV of ground, while operating on a single 5 V supply. This enables the video signal to be driven directly from the DAC output without any transition capacitance.

The amplifiers are specified for both 150 Ω and 100 Ω loads, and are supplied in the SOT23-5 and SO8 plastic packages. An evaluation board kit is available that includes a CD-ROM containing datasheets, application notes, articles and a user-manual.

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