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TSH344IDT 데이터시트(PDF) 11 Page - STMicroelectronics

부품명 TSH344IDT
상세설명  340MHz single-supply triple video buffer
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제조업체  STMICROELECTRONICS [STMicroelectronics]
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TSH344
Application information
11/17
Figure 27.
Details on one channel of the TSH344
Because of the shape of the signal described in Figure 25, we use a very low output rail
triple high-speed buffer. The TSH344 supplied in 5V single power supply features a low
output rail of 60mV (guaranteed by test) on 150
Ω load. It is dedicated for driving RGB
signals without synchronisation (in the case where the synchronization is provided digitally
on the digital bus).
The gain of the TSH344 (gain=2) is internal which makes it possible to remove two resistors
on the BOM. To avoid any perturbation on matching from the DACs output impedance along
a large band of 30MHz in HD, a discrete reconstruction filtering is implemented after the
driver. This filter is matched on 75
Ω. Note that the TSH344 uses a single supply architecture
and it is not AC output coupled (it cannot sink an output current, therefore it is not possible to
implement an output series capacitor).
video line
+5V
1/3 TSH344
(gain=2)
0V
0Volt
5Volt
Low output Rail :
60mV max. tested
(see datasheet p.3: Vol)
DAC
68pF
68pF
470nH
75
Ω
75
Ω
TV
STB
0Volt
5Volt
300mV
1V
0Volt
300mV
1V
+
100µF
10nF
External resistor.
Load required by
the DAC output
specification
600mV
2V


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