V
參數(shù)資料
型號(hào)： AD723ARUZ-REEL7
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 7/20頁(yè)
文件大小： 0K
描述： IC ENCODER RGB-NTSC/PAL 28-TSSOP
標(biāo)準(zhǔn)包裝： 1,000
類型： 視頻編碼器
應(yīng)用： 照相機(jī)，互聯(lián)網(wǎng)設(shè)備，機(jī)頂盒
電壓 - 電源，數(shù)字： 2.7 V ~ 5.5 V
安裝類型： 表面貼裝
封裝/外殼： 28-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 28-TSSOP
包裝： 帶卷 (TR)
REV. 0
AD723
–15–
SVGA MONITOR
TELEVISION
I/O
CONTROLLER
HSYNC
VSYNC
RED
GREEN
BLUE
GRAPHICS
SUBSYSTEM
VGA
CONNECTOR
VCC
GPO
GPI
GPO
CE
TERM
TVDET
SA
STND
4FSC
RIN
RT
GIN
GT
BIN
BT
HSYNC
VSYNC
COMPOSITE
VIDEO
S-VIDEO
(Y/C VIDEO)
AD723
Y
YSET
C
CSET
CV
CVSET
YTRAP
OPTIONAL
TGND
AGND
DGND
DVDD
AVDD1
AVDD
3V
0.1 F
+
VCC
75
0.1 F
75
0.1 F
375
300
375
300
375
300
0.1 F
10 F
DDCSCL 5V
DDCSDL 5V
VCC
ESD
PROTECTION
PI FILTER
Figure 8. PC Interface (Using Switch Input Termination)
R1
1M
Y1
TO PIN 17
OF AD723
U1A
U1B
R2
200
C2
60pF
C1
47pF
C3
~15pF
(OPT)
TO OTHER
DEVICE CLOCKS
HC04
Figure 9. Low Cost Crystal Oscillator
The crystal should be a parallel resonant type at the appropriate
frequency (NTSC/PAL, 4FSC). The series combination of C1 and
C2 should be approximately equal to the crystal manufacturer’s
specification for the parallel capacitance required for the crystal
to operate at its specified frequency. C1 will usually want to be a
somewhat smaller value because of the input parasitic capacitance
of the inverter. If it is desired to tune the frequency to greater
accuracy, C1 can be made still smaller and a parallel adjust-
able capacitor can be used to adjust the frequency to the
desired accuracy.
Resistor R2 serves to provide the additional phase shift required
by the circuit to sustain oscillation. It can be sized by R2 =
1/(2
× π × f × C2). Other functions of R2 are to provide a low-
pass filter that suppresses oscillations at harmonics of the
fundamental of the crystal and to isolate the output of the inverter
from the resonant load that the crystal network presents.
The basic oscillator described above is buffered by U1B to drive
the AD723 4FSC pin and other devices in the system. For a
system that requires both an NTSC and PAL oscillator, the
circuit can be duplicated by using a different pair of inverters
from the same package.
Dot Crawl
Numerous distortions are apparent in the presentation of com-
posite signals on TV monitors. These effects will vary in degree,
depending on the circuitry used by the monitor to process the
signal and on the nature of the image being displayed. It is
generally not possible to produce pictures on a composite moni-
tor that are as high quality as those produced by standard quality
RGB, VGA monitors.
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