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TSH344IDT 데이터시트(PDF) 11 Page - STMicroelectronics |
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TSH344IDT 데이터시트(HTML) 11 Page - STMicroelectronics |
11 / 17 page TSH344 Application information 11/17 Figure 27. Details on one channel of the TSH344 Because of the shape of the signal described in Figure 25, we use a very low output rail triple high-speed buffer. The TSH344 supplied in 5V single power supply features a low output rail of 60mV (guaranteed by test) on 150 Ω load. It is dedicated for driving RGB signals without synchronisation (in the case where the synchronization is provided digitally on the digital bus). The gain of the TSH344 (gain=2) is internal which 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 Ω. Note that the TSH344 uses a single supply architecture and it is not 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 TSH344 (gain=2) 0V 0Volt 5Volt Low output Rail : 60mV max. tested (see datasheet p.3: Vol) DAC 68pF 68pF 470nH 75 Ω 75 Ω TV STB 0Volt 5Volt 300mV 1V 0Volt 300mV 1V + 100µF 10nF External resistor. Load required by the DAC output specification 600mV 2V |
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