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TSH340ILT 数据表(PDF) 10 Page - STMicroelectronics |
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TSH340ILT 数据表(HTML) 10 Page - STMicroelectronics |
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10 / 13 page ![]() TSH340 Using the TSH340 to Drive Video Signals 10/13 5 Using the TSH340 to Drive Video Signals Figure 24. 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 125mV Synchronization Tip 0 IRE Black Level Image Content 30 IRE White Level 100 IRE 1Vp-p 300mV 0V 125mV VOL(100MHz) = 180mV (Figure 8) To drive the video signal properly, the output of the driver must be at least equal to 250mV (assuming VOS 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. +5V 1.125V 125mV time Volt 75 Ω 75 Ω Cable 75 Ω 1Vpp 2Vpp 1Vpp Video DAC 2.250V time Volt 6dB LPF Reconstruction Filtering 250mV Video Signal Video Signal +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 6dB LPF Reconstruction Filtering 250mV Video Signal Video Signal 33uF +5V 1.125V 125mV time Volt 75 Ω 75 Ω Cable 75 Ω 1Vpp 2Vpp 1Vpp Video DAC 2.250V time Volt 6dB LPF Reconstruction Filtering 250mV 1k DC component =125mV Video Signal Video Signal 33uF +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 6dB LPF Reconstruction Filtering 250mV 1k DC component =125mV Video Signal Video Signal |
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