Single-chip video filter/buffers
1 April 2009
Analogue, Mixed Signal, LSI
STMicroelectronics has introduced the TSH345 and TSH346 to address the technical benefits of using integrated video filter/buffers for consumer electronic products such as set-top boxes.
The new ICs drive output signals to a TV screen over 75 Ω video connections. By integrating three complete filter/buffers into a single chip, the devices eliminate multiple discrete components used to transmit RGB signals or component video such as Y-Pb-Pr. They also operate without the input capacitor normally added to preserve the video synchronisation signal, and require only a single 5 V supply.
The TSH345 can drive either high-definition signals at up to 30 MHz or standard-definition video in progressive or interlaced formats. A standby pin enables convenient power-saving operation. The TSH346 on the other hand, is optimised for high-definition equipment. Both types are delivered in small surface-mount packages, and can be used as direct replacements or as second source for other filter/buffer ICs.
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