參數(shù)資料
型號： AD721JP
廠商： ANALOG DEVICES INC
元件分類： 顏色信號轉(zhuǎn)換
英文描述： ECONOLINE: REC2.2-S_DR/H1 - 2.2W DIP Package- 1kVDC Isolation- Regulated Output- UL94V-0 Package Material- Continuous Short Circiut Protection- Internal SMD design- 100% Burned In- Efficiency to 75%
中文描述： COLOR SIGNAL ENCODER, PQCC28
封裝： PLASTIC, LCC-28
文件頁數(shù)： 6/8頁
文件大?。?/td> 146K
代理商： AD721JP
REV. 0
–6–
AD720/AD721
T he filtered output is summed with the luminance signal to cre-
ate a composite video signal. T he separate luminance, chromi-
nance, and composite video signals are amplified by gain-of-two
amplifiers for driving 75
reverse-terminated lines. T he sepa-
rate luminance and chrominance outputs together are known as
“S-Video.”
T he digital section of the AD720/AD721 is clocked by the
4FSC input. It measures the width of pulses in the composite
sync input to separate vertical, horizontal, and serration pulses
and to insert the subcarrier burst only after a valid horizontal
sync pulse.
Asserting the ENCD pin to a logical low routes the AD721’s
RGB inputs through three gain-of-two bypass buffers for driving
75
reverse-terminated lines, bypassing the encoder section of
the AD721. T he triple bypass amplifier is utilized to overcome
the loading effects of a “T V-out” connection on the RGB moni-
tor output. When a video encoder is connected to outputs of a
current-out video RAMDAC or VGA controller, the R, G, and
B signals to the monitor are loaded-down. T his requires the use
of a gain block to properly drive the monitor.
0.1
μ
F
4
3
2
1
28
27
26
18
17
16
15
14
13
12
11
10
9
8
6
7
5
19
25
24
23
22
21
20
AGND
N
N
A
VNEG
N
SYNC
DPOS
4FSC
DPOS
ASNC
DGND
ENCD
RDIN
AGND
GRIN
AGND
BLIN
STND
AGND
C
A
C
A
L
VNEG
DGND
AD720
CHROMINANCE OUTPUT
COMPOSITE OUTPUT
LUMINANCE OUTPUT
75
75
75
RGB TO NTSC/PAL
ENCODER
N
0.1
μ
F
0.1
μ
F
0.1
μ
F
0.1
μ
F
0.1
μ
F
–5V FROM ANALOG SUPPLY
COMPOSITE SYNC INPUT
CMOS LOGIC LEVEL
NEGATIVE SYNC TIPS
+5V FROM
DIGITAL SUPPLY
+5V FROM
DIGITAL SUPPLY
4 X SUBCARRIER INPUT
CMOS LOGIC LEVELS
NTCS = 14.318 180MHz
PAL = 17.734 480MHz
ENCODE INPUT
ENCODE = CMOS HIGH
POWER DOWN = CMOS LOW
VIDEO STANDARD
SELECTION INPUT
NTSC = CMOS HIGH
PAL = CMOS LOW
+5V FROM
ANALOG SUPPLY
+5V FROM
ANALOG SUPPLY
–5V FROM
ANALOG SUPPLY
75
75
75
VIDEO
RAM-DAC
ADV47X
ADV71XX
IOR
IOG
IOB
75
75
75
Figure 9. AD720 Application
+5V FROM
ANALOG SUPPLY
0.1
μ
F
0.1
μ
F
–5V FROM
ANALOG SUPPLY
BLUE OUTPUT
GREEN OUTPUT
RED OUTPUT
75
75
75
4
3
2
1
28
27
26
18
17
16
15
14
13
12
11
10
9
8
6
7
5
19
25
24
23
22
21
20
AGND
N
N
A
VNEG
N
SYNC
DPOS
4FSC
DPOS
ASNC
DGND
ENCD
RDIN
AGND
GRIN
AGND
BLIN
STND
AGND
C
A
C
A
L
VNEG
DGND
AD721
CHROMINANCE OUTPUT
COMPOSITE OUTPUT
LUMINANCE OUTPUT
75
75
75
RGB TO NTSC/PAL
ENCODER
N
0.1
μ
F
0.1
μ
F
0.1
μ
F
0.1
μ
F
–5V FROM ANALOG SUPPLY
COMPOSITE SYNC INPUT
CMOS LOGIC LEVEL
NEGATIVE SYNC TIPS
+5V FROM
DIGITAL SUPPLY
+5V FROM
DIGITAL SUPPLY
4 X SUBCARRIER INPUT
CMOS LOGIC LEVELS
NTCS = 14.318 180MHz
PAL = 17.734 480MHz
ENCODE INPUT
ENCODE = CMOS HIGH
BYPASS = CMOS LOW
VIDEO STANDARD
SELECTION INPUT
NTSC = CMOS HIGH
PAL = CMOS LOW
+5V FROM
ANALOG SUPPLY
75
75
75
VIDEO
RAM-DAC
ADV47X
ADV71XX
IOR
IOG
IOB
75
75
75
Figure 10. AD721 Application
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