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AD725 Datasheet(PDF) 7 Page - Analog Devices

Part No. AD725
Description  Low Cost RGB to NTSC/PAL Encoder with Luma Trap Port
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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 7 page
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AD725
REV. 0
–7–
060
10
20
30
40
50
APL = 48.2%
525 LINE NTSC
NO FILTERING
SLOW CLAMP TO 0.00V @ 6.63 s
100
50
0
–50
1.0
0.5
–0.5
0.0
s
0.5MHz
1MHz
2MHz
3MHz
4MHz
5MHz
Figure 11. Multiburst, NTSC
9.35 s
5.57 s
4.80 s
38.0 IRE
36.1 IRE
H TIMING MEASUREMENT RS–170A (NTSC)
FIELD = 1 LINE = 22
AVERAGE
256
89ns
85ns
9.0
CYCLES
Figure 12. Horizontal Timing, NTSC
1ST
2ND
3RD
4TH
5TH
6TH
0.00
0.07
–0.05
0.20
0.22
0.39
0.00
–0.33
0.10
0.70
1.05
1.17
DG DP (NTSC)
DIFFERENTIAL GAIN (%)
DIFFERENTIAL PHASE (deg)
MIN = –0.05
MAX = 0.39
MIN = –0.33
MAX = 1.17
pk–pk = 1.50
0.5
0.4
0.3
0.2
0.1
0.0
–0.1
–0.2
2.0
1.5
1.0
0.5
0.0
–0.5
–1.0
Wfm —
> MOD 5 STEP
pk–pk/MAX = 0.44
Figure 13. Composite Output Differential Phase
and Gain, NTSC
060
10
20
30
40
50
APL = 48.2%
625 LINE PAL
NO FILTERING
SLOW CLAMP TO 0.00V @ 6.72 s
100
50
0
–50
1.0
0.5
–0.5
0.0
s
1MHz
2MHz
3MHz
4MHz
5MHz
6MHz
Figure 14. Multiburst, PAL
5.67 s
AVERAGE
256
89ns
70ns
2.29 s
4.90 s
287.7mV
273.4mV
H TIMING (PAL)
LINE = 25
Figure 15. Horizontal Timing, PAL
1ST
2ND
3RD
4TH
5TH
6TH
0.00
–0.06
0.15
0.23
0.43
0.38
0.00
–0.44
–0.02
0.70
1.17
1.34
DG DP (PAL)
DIFFERENTIAL GAIN (%)
DIFFERENTIAL PHASE (deg)
MIN = –0.06
MAX = 0.43
pk–pk = 0.49
MIN = –0.44
MAX = 1.34
pk–pk = 1.79
0.5
0.4
0.3
0.2
0.1
0.0
–0.1
–0.2
2.0
1.5
1.0
0.5
0.0
–0.5
–1.0
Wfm —
> MOD 5 STEP
Figure 16. Composite Output Differential Phase
and Gain, PAL




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