Buffers for HD TV
20 January 2009
Single-chip video filter/buffers are for digital TV, Blu-ray, PVR, and set-top box applications.
The STMicroelectronics TSH345 and TSH346 filters for SD and HD applications are pin-compatible with existing devices. They will be used in products such as Blu-ray players, standard DVD players, PVRs, set-top boxes and digital televisions, to drive output signals to the TV screen over 75Ohm video connections.
By integrating three complete filter/buffers into a single chip, the TSH345 or TSH346 eliminate multiple discrete components used to transmit RGB signals or component video such as Y-Pb-Pr. They will also operate without the input capacitor normally added to preserve the video synchronisation signal, and require only a single 5V supply.
The TSH345 can drive either HD signals at up to 30MHz or standard-definition video in progressive or interlaced formats. A stand-by pin enables convenient power-saving operation. The TSH346 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. The TSH345 is a replacement for the FMS6203, FMS6418, ADA4412-3, or MAX7454 and the TSH346 replaces the FMS6363, ML6426-5, ADA4417-3, THS7316, or MAX9500-9501.
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