THS7373_10 Datasheet, PDF (36/50 Pages) Texas Instruments – 4-Channel Video Amplifier with 1-SD and 3-HD Sixth-Order Filters and 6-dB Gain

THS7373
SBOS506 – DECEMBER 2009
OUTPUT MODE OF OPERATION:
DC-COUPLED
The THS7373 incorporates a rail-to-rail output stage
that can be used to drive the line directly without the
need for large ac-coupling capacitors. This design
offers the best line tilt and field tilt (droop)
performance because no ac-coupling occurs. Keep in
mind that if the input is ac-coupled, then the resulting
tilt as a result of the input ac-coupling continues to be
seen on the output, regardless of the output coupling.
The 80-mA output current drive capability of the
THS7373 is designed to drive two video lines
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simultaneously per channel—essentially, a 75-Ω
load—while keeping the output dynamic range as
wide as possible. Figure 102 shows the THS7373
driving two video lines while keeping the output
dc-coupled.
CVBS
Y’
P'_B
P'_R
0.1 mF⁽¹⁾
R
0.1 mF⁽¹⁾
R
+3.3 V
0.1 mF⁽¹⁾
3.65 MW
R
+3.3 V
0.1 mF⁽¹⁾
3.65 MW
R
THS7373
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
6 DISABLE
V_S+ 10
HD BYPASS 9
7 NC
NC 8
To GPIO Controller
or GND
+3 V to +5 V
75 W ^{330 mF(2)}
75 W ^{330 mF(2) CVBS Out 1}
75 W ^{330 mF(2)}
75 W ^{330 mF(2) Y' Out 1}
75 W ^{330 mF(2)}
75 W ^{330 mF(2) P'B Out 1}
75 W ^{330 mF(2)}
75 W ^{330 mF(2) P'R Out 1}
CVBS Out 2
75 W
Y' Out 2
75 W
P’_B Out 2
75 W
P’_R Out 2
75 W
75 W
75 W
75 W
75 W
(1) This example shows an ac-coupled input. DC-coupling is also allowed as long as the DAC output voltage is within the allowable linear
input and output voltage range of the THS7373. To achieve dc-coupling, remove the 0.1-μF input capacitors and the 3.65-MΩ pull-up
resistors.
(2) This example shows ac-coupled outputs. DC-coupled outputs are also allowed by simply removing the series capacitors on each output.
Figure 102. Typical CVBS + Component Video System with AC-Coupled Inputs and Two Outputs Per
Channel
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