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TSH345ID 数据表(PDF) 8 Page - STMicroelectronics |
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TSH345ID 数据表(HTML) 8 Page - STMicroelectronics |
8 / 14 page Using the TSH345 to drive Y-C, CVBS, Y-U-V, Y-Pb-Pr and R-G-B video components TSH345 8/14 Figure 4. Flexibility of the TSH345 for SD and HD signals The TSH345 is used to drive either high definition video signals up to 30 MHz, or progessive and interlaced standard definition video signals on 75-ohm video lines. It can drive a large panel of signals like Y-C and CVBS, Y-U-V, Y-Pb-Pr and R-G-B where the bottom of the signal (the synchronization tip in the case of Y and CVBS signals) is close to zero volts. An internal input DC value is added to the video signal in order to shift the bottom from GND. The shift is not based on the average of the signal, but is an analog summation of a DC component to the video signal. Therefore, no input capacitors are required, which provides a real advantage in terms of cost and board space. Under these conditions, it is possible to drive the signal in single supply without any saturation of the driver against the lower rail. Because half of the signal is lost through output impedance matching, in order to properly drive the video line, the shifted signal is multiplied by a gain of 2 or +6 dB. +5V Cable 75 Ω Y,G Cable 75 Ω DAC Pb,B DAC Cable 75 Ω DAC Pr,R DAC DAC DAC Mux Filter select Standby TSH345 TSSOP14 SO14 TSH345 TSSOP14 SO14 HD/PV/SD Y,G Pb,B,C Pr,R,CVBS 150 Ω 150 Ω 150 Ω 150 Ω 150 Ω 150 Ω 150 Ω 150 Ω 150 Ω 150 Ω 150 Ω 150 Ω 75 Ω 75 Ω 75 Ω 75 Ω 75 Ω 75 Ω TV +5V Cable 75 Ω Y,G Cable 75 Ω DAC Pb,B,C DAC Cable 75 Ω DAC Pr,R,CVBS TSH345 TSSOP14 SO14 TSH345 TSSOP14 SO14 Filter select Standby Mux (NC) NC NC NC HD/PV/SD 150 Ω 150 Ω 150 Ω 150 Ω 150 Ω 150 Ω 75 Ω 75 Ω 75 Ω 75 Ω 75 Ω 75 Ω TV |
类似零件编号 - TSH345ID |
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类似说明 - TSH345ID |
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