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TSH345 数据表(PDF) 8 Page - STMicroelectronics

部件名 TSH345
功能描述  Triple video buffer with selectable filter for HD and SD video applications
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

TSH345 数据表(HTML) 8 Page - STMicroelectronics

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Using the TSH345 to drive Y-C, CVBS, Y-U-V, Y-Pb-Pr and R-G-B video components
TSH345
8/14
Figure 4.
Flexibility of the TSH345 for SD and HD signals
The TSH345 is used to drive either high definition video signals up to 30 MHz, or progessive
and interlaced standard definition video signals on 75-ohm video lines. It can drive a large
panel of signals like Y-C and CVBS, Y-U-V, Y-Pb-Pr and R-G-B where the bottom of the signal
(the synchronization tip in the case of Y and CVBS signals) is close to zero volts. An internal
input DC value is added to the video signal in order to shift the bottom from GND.
The shift is not based on the average of the signal, but is an analog summation of a DC
component to the video signal. Therefore, no input capacitors are required, which provides a
real advantage in terms of cost and board space.
Under these conditions, it is possible to drive the signal in single supply without any
saturation of the driver against the lower rail.
Because half of the signal is lost through output impedance matching, in order to properly
drive the video line, the shifted signal is multiplied by a gain of 2 or +6 dB.
+5V
Cable
75
Ω
Y,G
Cable
75
Ω
DAC
Pb,B
DAC
Cable
75
Ω
DAC
Pr,R
DAC
DAC
DAC
Mux
Filter select
Standby
TSH345
TSSOP14
SO14
TSH345
TSSOP14
SO14
HD/PV/SD
Y,G
Pb,B,C
Pr,R,CVBS
150
Ω
150
Ω
150
Ω
150
Ω
150
Ω
150
Ω
150
Ω
150
Ω
150
Ω
150
Ω
150
Ω
150
Ω
75
Ω
75
Ω
75
Ω
75
Ω
75
Ω
75
Ω
TV
+5V
Cable
75
Ω
Y,G
Cable
75
Ω
DAC
Pb,B,C
DAC
Cable
75
Ω
DAC
Pr,R,CVBS
TSH345
TSSOP14
SO14
TSH345
TSSOP14
SO14
Filter select
Standby
Mux (NC)
NC
NC
NC
HD/PV/SD
150
Ω
150
Ω
150
Ω
150
Ω
150
Ω
150
Ω
75
Ω
75
Ω
75
Ω
75
Ω
75
Ω
75
Ω
TV


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