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TSH341 bảng dữ liệu(PDF) 10 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  300MHz Single Supply Video Amplifier with Low In,Out Rail
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TSH341 bảng dữ liệu(HTML) 10 Page - STMicroelectronics

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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



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