ML6427CS 查看數據表（PDF） - Fairchild Semiconductor
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ML6427CS Datasheet PDF : 17 Pages
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TYPICAL APPLICATIONS (Continued)
USING THE ML6427 FOR PAL APPLICATIONS
The ML6427 can be optimized for PAL video by adding
frequency peaking to the composite and S-video outputs.
Figure 10 illustrates the use of an additional external
capacitor (330pF) in parallel with the output source
termination resistor. This raises the frequency response
from 1.6dB at 4.8MHz to 0.35dB at 4.8MHz, which
allows for accurate reproduction of the upper sideband of
the PAL subcarrier. Figure 11 shows the frequency
response of PAL video with various values of peaking
ML6427
capacitors (220pF, 270pF, 330pF and none) between 0 and
10MHz.
For NTSC applications without the peaking capacitor the
rejection at 27MHz is 42dB (typical). For PAL applications
with the peaking capacitor the rejection at 27MHz is 38dB
(typical). See Figure 12. The differential group delay,
shown in Figure 13 with and without a peaking capacitor
(220pF, 270pF, and 330pF and none), varies slightly with
capacitance from 8ns to 13ns.
19
GNDO
CVINU/Y1
2
CVINFA/Y2
3
CVINFB/Y3
4
RINA/Y4
7
RINB/Y5
8
GINA/Y6
9
GINB/Y7
10
BINA/C1
11
BINB/C2
12
5
GND
SYNCIN
23
SYNCOUT
24
17
VCCORGB
22
VCCOCV
6
VCC
CVOUT1/YOUTA
21
ML6427
A/B MUX
1
CVOUT2/YOUTB
20
ROUT/YOUTC
18
GOUT/YOUTD
16
BOUT/COUT
15
SWAP CVF SWAP CVU
13
14
INPUTS
Bank A:
Bank B:
Other:
RGB, CV filtered path
RGB, CV filtered path
CV unfiltered path, Sync IN (slave mode)
220µF 75Ω
VIDEO CABLES
CV/Y
MODULATOR
220µF 75Ω
CV/Y
220µF 75Ω
220µF 75Ω
220µF 75Ω
MODULATOR
R/Y
G/Y
B/C
OPTIONAL FOR DC COUPLED APPLICATIONS
H SYNC OUT
OUTPUTS
Option 1: 2 CV outputs + 2 TV modulator outputs, 1 RGB output
Option 2: 2 CV outputs + 1 TV modulator output, 1 S-video output
Other: Sync output (buffered stripped sync)
Figure 4. Basic Application for NTSC
COMPOSITE
VIDEO IN
LUMA IN
CHROMA IN
19
GNDO
CVINU/Y1
2
CVINFA/Y2
3
CVINFB/Y3
4
RINA/Y4
7
RINB/Y5
8
GINA/Y6
9
GINB/Y7
10
BINA/C1
11
BINB/C2
12
5
GND
SYNCIN
23
SYNCOUT
24
17
VCCORGB
22
VCCOCV
6
VCC
CVOUT1/YOUTA
21
ML6427
MASTER
A/B MUX
1
CVOUT2/YOUTB
20
LUMA
ROUT/YOUTC
OUT
18
GOUT/YOUTD
16
CHROMA
BOUT/COUT
OUT
15
SWAP CVF SWAP CVU
13
14
COMPOSITE
VIDEO OUT
S-VIDEO
OUT
TO EVC
CONNECTOR
H SYNC OUT
Figure 5. EVC (Enhanced Video Connector) Application: S-Video, Composite, plus H-Sync out
9
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