THS7347_15 Datasheet, PDF (15/33 Pages) Texas Instruments – 3-Channel RGBHV Video Buffer with I2C Control, 2:1 Input Mux, Monitor Pass-Through, and Selectable Input Bias Modes

THS7347
www.ti.com
SLOS531B – MAY 2007 – REVISED OCTOBER 2011
placed first in the system. Since the blue color difference channel (P'_B) is next and the red color difference
channel (P'_R) is last, then it also makes logical sense to place the B' signal on the second channel and the R'
signal on the third channel, respectively. Thus, hardware compatibility is better achieved when using G'B'R'
rather than R'G'B'. Note that for many G'B'R' systems, sync is embedded on all three channels; this configuration
may not always be the case for all systems.
Monitor Output
Red
75 W
Green
2.2 mF
2.2 mF
75 W
Y’
75 W
Blue
2.2 mF
75 W
P’_B
75 W
H-Sync 806 W
V_A
75 W
P’_R
V_A
Component
480i
576i
480p
576p
720p
1080i
1080p
G’B’R’
1.4 kW
V-Sync 806 W
1.4 kW
0.1 mF
Y’
75 W
2.2 mF
P’_B
75 W
48 47 46 45 44 43 42 41 40 39 38 37
1
36
2
35
3
34
4
33
5
32
6
31
THS7347
7
30
8
29
9
28
10
27
11
26
12
25
13 14 15 16 17 18 19 20 21 22 23 24
P’_R
2.2 mF
75 W
H-Sync and
V-Sync 0.1 mF
Not Used
3.3 V
22 pF
3.3 V
22 pF
0.1 mF
V_A
0.1 mF
V_A
0.1 mF
+3.3 V +1.8 V
ADC
Scalar/
Decoder
100
100
V_A = 3.3 V to 5 V
2
IC
(1) Inputs and/or outputs can be ac- or dc-coupled if desired.
(2) H-Sync and V-Sync input resistance as shown above = 2.2 kΩ, but may be changed to any desired resistance.
(3) If the Monitor or Buffer PCB trace is > 25 mm, it is recommended to place at least a 10-Ω resistor in series with each
signal to reduce PCB parasitic issues
Figure 4. Typical R'G'B'HV and Y'P'_BP'_R AC-Coupled Inputs and DC-Coupled Output Configuration
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