THS8134 Datasheet, PDF (17/24 Pages) Texas Instruments – TRIPLE 8-BIT, 80 MSPS VIDEO D/A CONVERTER WITH TRI-LEVEL SYNC GENERATION

THS8134, THS8134A, THS8134B
TRIPLE 8-BIT, 80 MSPS VIDEO D/A CONVERTER
WITH TRI-LEVEL SYNC GENERATION
SLVS205D – MAY 1999 – REVISED MARCH 2000
APPLICATION INFORMATION
SMPTE 253M (continued)
Table 7. Video Standards Compatible with SMPTE 253M
STANDARD
SMPTE 125M
SMPTE 267M
SMPTE 170M
TITLE
Component Video Signal 4:2:2 – Bit-Parallel Digital Interface
Bit – Parallel Digital Interface – Component Video Signal 4:2:2 16x9 Aspect Ratio
Composite Analog Video Signal – NTSC for Studio Applications
The SMPTE 253M standard defines a GBR component set with positive going signals and a maximum peak
level of 700 mV from blanking level. The green signal has a negative-going sync pulse of amplitude 300 mV
from blanking level. The dc offset, as defined by the blanking level of the signal, is 0.0 V ±1.0 V. Figure 12 shows
the waveform of the green channel, onto which the horizontal sync is inserted.
H Blanking rise time
90%
50%
50%
10%
90%
Horizontal
reference
point ^50%
Blanking Start
to H reference
Sync rise time
10%
Sync
50%
H reference to Blanking End
Figure 12. SMPTE 253M Line Waveform (green channel)
For this mode, the INS3_INT control should be kept low to enable sync-on-green only and the device is put in
GBR 4:4:4 mode. This corresponds to the GBR with sync-on-green operation mode of Table 1.
Table 8 lists the THS8134 output currents that will produce compliant signals to this standard after proper
termination, together with the required input signals.
LEVEL
White
Video
Black
Blank
Sync
Table 8. THS8134 Signals for SMPTE 253M Compliant Operation
AGY
(mA)
(V)
26.67
1.000
Video+8.00 Video+0.3
8.00
0.3000
8.00
0.3000
0
0
ARPr, ABPb
(mA)
(V)
18.67 0.7000
Video Video
0
0
0
0
0
0
SYNC
1
1
1
1
0
SYNC_T
X
X
X
X
0
BLANK
1
1
1
0
x
DAC INPUT
FFh
data
00h
xxh
xxh
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