THS7376_14 Datasheet, PDF (38/62 Pages) Texas Instruments – 4-Channel Video Amplifier with One SD and Three HD 8th-Order Filters with 6-dB Gain

THS7376
SBOS692 – JUNE 2013
www.ti.com
Figure 127 shows the THS7376 driving two dc-coupled video loads on each output with dc-coupled inputs.
Parasitic capacitances are not shown for simplification purposes. Note that ac-coupling on the inputs is also fully
applicable if desired.
CVBS
R
Y’, G’
R
P’_B, B’
R
P’_R, R’
R
1 CVBS IN
CVBS OUT 14
2 HD CH1 IN ^{HD CH1 OUT} 13
3 HD CH2 IN HD CH2 OUT 12
4 ^{HD CH3 IN HD CH3 OUT} 11
5 GND
VS+ 10
6 ^DISABLE HD BYPASS 9
7 ^NC
NC ₈
CVBS 1 Out
75 W
75 W
Y’, G’ 1 Out
75 W
75 W
P’_B, B’ 1 Out
75 W
75 W
P’_R, R’ 1 Out
75 W
75 W
CVBS 2 Out
75 W
Y’, G’ 2 Out
75 W
P’_B, B’ 2 Out
75 W
P’_R, R’ 2 Out
75 W
75 W
75 W
75 W
75 W
To GPIO
+3 V to 5 V
Controller Or GND
Figure 127. Typical DC-Coupled Input System Configuration Driving Two DC-Coupled Loads per Channel
Figure 128 shows the THS7376 driving two ac-coupled video loads on each output with dc-coupled inputs.
Parasitic capacitances are not shown for simplification purposes. Note that ac-coupling on the inputs is also fully
applicable if desired. Also note that the large coupling capacitors should be placed after the 75-Ω resistor and not
before them. This configuration isolates the parasitic capacitance of the capacitors from appearing on the device
output, thus creating a very stable system.
CVBS
R
Y’, G’
R
P’_B, B’
R
P’_R, R’
R
1 CVBS IN
CVBS OUT 14
2 HD CH1 IN HD CH1 OUT 13
3 HD CH2 IN HD CH2 OUT 12
4 ^{HD CH3 IN HD CH3 OUT} 11
5 GND
VS+ 10
6 DISABLE HD BYPASS 9
7 ^NC
NC ₈
CVBS 1 Out
+
75 W 330 mF
75 W
Y’, G’ 1 Out
+
75 W 330 mF
75 W
+ ^{P’B, B’ 1 Out}
75 W 330 mF
75 W
+ ^{P’R, R’ 1 Out}
75 W 330 mF
75 W
CVBS 2 Out
+
75 W 330 mF
75 W
Y’, G’ 2 Out
+
75 W 330 mF
75 W
P’_B, B’ 2 Out
+
75 W 330 mF
75 W
+ ^{P’R, R’ 2 Out}
75 W 330 mF
75 W
To GPIO
+3 V to 5 V
Controller Or GND
Figure 128. Typical DC-Coupled Input System Configuration Driving Two AC-Coupled Loads per Channel
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