TSH344 STMicroelectronics, TSH344 Datasheet - Page 11

• Manufacturer Part Number: TSH344
• Description: 340MHz single-supply triple video buffer
• Manufacturer: STMicroelectronics

Specifications of TSH344

• Bandwidth: 340MHz
• Slew Rate: 740V/ms

TSH344
Figure 27. Details on one channel of the TSH344
Because of the shape of the signal described in
triple high-speed buffer. The TSH344 supplied in 5V single power supply features a low
output rail of 60mV (guaranteed by test) on 150Ω 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 75Ω . 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).
External resistor.
Load required by
the DAC output
specification
DAC
300mV
1V
5Volt
0Volt
1/3 TSH344
(gain=2)
+5V
600mV
2V
0V
10nF
5Volt
0Volt
+
100µF
75Ω
Figure
Low output Rail :
60mV max. tested
(see datasheet p.3: Vol)
68pF
470nH
25, we use a very low output rail
STB
68pF
video line
Application information
TV
300mV
1V
75Ω
0Volt
11/17