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TSH341 Fiches technique(PDF) 10 Page - STMicroelectronics |
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TSH341 Fiches technique(HTML) 10 Page - STMicroelectronics |
10 / 13 page TSH341 Using the TSH341 to Drive Video Signals 10/13 5 Using the TSH341 to Drive Video Signals Figure 25. Implementation of the video driver on output video DACs Synchronization Tip 0 IRE Black Level Image Content 30 IRE White Level 100 IRE 1Vp-p 300mV 0V 150mV Synchronization Tip 0 IRE Black Level Image Content 30 IRE White Level 100 IRE 1Vp-p 300mV 0V 150mV VOL(50MHz) = 150mV (Figure 8) To drive the video signal properly, the output of the driver must be at least equal to 250mV (assuming Vio and VOL variations). 1st solution: Set the video DAC 0-IRE output level to 125mV. 2nd solution: Implementation of a DC component in the input of the driver. 33uF 1.125V 125mV time Volt 75 Ω 75 Ω Cable 75 Ω 1Vpp 2Vpp 1Vpp Video DAC 2.250V time Volt LPF Reconstruction Filtering 250mV 1k DC component =125mV Video Signal Video Signal +5V + _ Rfb Rg 33uF 1.125V 125mV time Volt 1.125V 125mV time 1.125V 125mV time Volt 75 Ω 75 Ω Cable 75 Ω 1Vpp 1Vpp 2Vpp 1Vpp 1Vpp Video DAC 2.250V time Volt LPF Reconstruction Filtering 250mV 1k DC component =125mV Video Signal Video Signal +5V + _ Rfb Rg +5V 1.125V 125mV time Volt 75 Ω 75 Ω Cable 75 Ω 1Vpp 2Vpp 1Vpp Video DAC 2.250V time Volt LPF Reconstruction Filtering 250mV Video Signal Video Signal + _ Rfb Rg +5V 1.125V 125mV time Volt 1.125V 125mV time 1.125V 125mV time Volt 75 Ω 75 Ω Cable 75 Ω 1Vpp 1Vpp 2Vpp 1Vpp 1Vpp Video DAC 2.250V time Volt LPF Reconstruction Filtering 250mV Video Signal Video Signal + _ Rfb Rg |
Numéro de pièce similaire - TSH341 |
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Description similaire - TSH341 |
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