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參數(shù)資料
| 型號： | TMC2360 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | VGA to NTSC/PAL Video Output Processor(VGA 到NTSC/PAL 視頻輸出處理器) |
| 中文描述： | VGA轉(zhuǎn)NTSC / PAL視頻輸出處理器（顯卡到的NTSC / PAL視頻輸出處理器） |
| 文件頁數(shù)： | 8/24頁 |
| 文件大?。?/td> | 230K |
| 代理商： | TMC2360 |
TMC2360
PRODUCT SPECIFICATION
8
Table 3. NTSC and PAL Pixel Clocks
Reference Clock
Accuracy of the PAL/NTSC subcarrier depends on the 27
MHz reference signal applied to the XTAL
1
. This signal may
be derived from a clock connected directly to the XTAL
1
pin
or a crystal and capacitors connected across XTAL
1-2
as
shown in Figure 2.
Figure 2. Crystal Oscillator Circuit
Capacitors C
1
and C
2
must be adjusted to trim the frequency
within 20 ppm. C
1
and C
2
have the same value, with series
capacitance equal to the load recommended for the crystal.
Typical crystal parameters are 50 ppm accuracy with a 20 pF
load and
±
80 ppm pullability.
Digitizing
A/D Reference
An on-chip voltage follower is included to supply current to
the ADC reference V
RT
from V
TOUT
. A stable voltage
source greater than the input peak amplitude should be con-
nected to V
TIN
.
Input Signal Conditioning
ADC performance can be optimized by driving the RGB
video inputs with either a 75 ohm or a low impedance
source.
Input Format Selection
One of four input VGA formats can be accepted by setting
the TVSTD
1-0
and PAL800 inputs as shown in Table 4. Each
VGA input option corresponds to a VGA active video area,
frame rate and line rate with a corresponding TV output
format.
Television
Standard
NTSC
PAL
PALM
Line Rate
(kHz)
15.734
15.625
15.750
Pixel Rate
(MHz)
24.545
29.500
24.570
M
780
944
780
C
1
A
GND
29002A
C
2
XTAL
1
XTAL
2
Table 4. VGA Input Formats
Processing
Flicker Filter
Annoying artifacts can be eliminated by selecting one of
three filter modes, which trade-off vertical resolution against
flicker. Without the filter, one contrasting VGA line may be
encoded into one field of the TV video, which will flicker at
30 Hz with NTSC and 25 Hz with PAL.
As shown in Table 5, if VSCOM = LOW, pulsing the FIL pin
indexes the TMC2360 through a loop of three filter modes
and a color bar pattern.
Table 5. FIL Filter Mode Select Sequence
Video Encoder
D/A Reference
Peak D/A converter current for the video outputs is set by a
resistor connected to R
REF
. For 1 volt video, with a 37.5 ohm
load, the correct value of R
REF
is 392 ohm. To trim the video
output level, R
REF
can be replaced with a potentiometer.
(See the Applications Circuit, Figure 15).
Television Standard Selection
NTSC and PAL standards are preprogrammed into the
TMC2360 to preset horizontal and vertical timing, subcarrier
frequency, and chrominance phase. Frame rate of the VGA
source must match the field rate of the selected video
standard.
Depending upon the status of the Vertical Sync Communica-
tions (VSCOM) pin, the video output format may be selected
by either the TVSTD
1-0
pins or by VSCOM codes.
Table 6 shows how the TVSTD
1-0
pins select the TV output
format with VSCOM = LOW.
TVSTD
1-0
0x
10
10
11
PAL800
0
0
1
0
H x V
Input
Pixels
640 x 480
640 x 480
800 x 600
640 x 480
Frame
Rate
(Hz)
59.94
50
50
60
Line
Rate
(kHz)
31.469
31.250
31.250
31.469
FIL
↓
↓
↓
Filter Mode
HIGH (default)
MEDIUM
No filter
Color bars
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