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TSH340 데이터시트(PDF) 10 Page - STMicroelectronics

부품명 TSH340
상세설명  320MHz Single Supply Video Buffer with Low In/Out Rail
PDF  13 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TSH340 데이터시트(HTML) 10 Page - STMicroelectronics

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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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