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TSH343ID Scheda tecnica(PDF) 11 Page - STMicroelectronics |
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TSH343ID Scheda tecnica(HTML) 11 Page - STMicroelectronics |
11 / 17 page TSH343 Application information 11/17 Figure 27. Detailed view of one TSH343 channel Because of the shape of the signal shown in Figure 25, we use a very low output rail triple high-speed buffer. The TSH343 supplied in 5V single power supply, features a low output rail of 40mV on 150-ohm load. The TSH343 is used to drive high definition video signals up to 30MHz on 75-ohm video lines. It is dedicated to driving YPbPr signals where the synchronization tip—close to zero volt—is included in the Y signal. Figure 27 shows a solution used on the STMicroelectronics reference design of STi7100 or STi7200 where the DAC output is loaded by 140 Ω and the bottom of the synchronization tip is set at 10mV. Using the TSH343, an internal input DC value of 600mV is added to the video signal in order to shift the bottom from 10mV to 610mV. 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. The internal gain of 2 obtained makes it possible to remove two resistors on the BOM. To avoid any perturbation on matching from the DACs output impedance along a large band of 30MHz in HD, a discrete reconstruction filtering is implemented after the driver. This filter is matched on 75-ohms. Note that the TSH343 cannot be AC output coupled (it cannot sink an output current, therefore it is not possible to implement an output series capacitor). video line +5V 1/3 TSH343 (gain=2) 0V 0Volt 5Volt DAC 68pF 68pF 470nH 75 Ω 75 Ω TV STB 1,22V (10mV+600mV)*gain 3,22V 0Volt 5Volt 10mV 1,01V 0Volt 610mV 1,61V 140 Ω + 600mV DC -5V 5Volt |
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