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參數(shù)資料
| 型號(hào)： | TMC2360KLC |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 顏色信號(hào)轉(zhuǎn)換 |
| 英文描述： | COLOR SIGNAL ENCODER, PQFP80 |
| 封裝： | 2.70 MM HEIGHT, MQFP-80 |
| 文件頁(yè)數(shù)： | 23/24頁(yè) |
| 文件大?。?/td> | 158K |
| 代理商： | TMC2360KLC |
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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 XTAL1. This signal may
be derived from a clock connected directly to the XTAL1 pin
or a crystal and capacitors connected across XTAL1-2 as
shown in Figure 2.
Figure 2. Crystal Oscillator Circuit
Capacitors C1 and C2 must be adjusted to trim the frequency
within 20 ppm. C1 and C2 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 VRT from VTOUT. A stable voltage
source greater than the input peak amplitude should be con-
nected to VTIN.
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 TVSTD1-0 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
Line Rate
(kHz)
Pixel Rate
(MHz)
M
NTSC
15.734
24.545
780
PAL
15.625
29.500
944
PALM
15.750
24.570
780
C1
AGND
29002A
C2
XTAL1
XTAL2
Table 4. VGA Input Formats
Processing
Flicker Filter
Annoying artifacts can be eliminated by selecting one of
three lter modes, which trade-off vertical resolution against
icker. Without the lter, one contrasting VGA line may be
encoded into one eld of the TV video, which will icker 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 lter 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 RREF. For 1 volt video, with a 37.5 ohm
load, the correct value of RREF is 392 ohm. To trim the video
output level, RREF 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 eld 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 TVSTD1-0 pins or by VSCOM codes.
Table 6 shows how the TVSTD1-0 pins select the TV output
format with VSCOM = LOW.
TVSTD1-0
PAL800
H x V
Input
Pixels
Frame
Rate
(Hz)
Line
Rate
(kHz)
0x
0
640 x 480
59.94
31.469
10
0
640 x 480
50
31.250
10
1
800 x 600
50
31.250
11
0
640 x 480
60
31.469
FIL
Filter Mode
↓
HIGH (default)
↓
MEDIUM
↓
No filter
Color bars
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