MAX9512ATE 데이터 시트보기 (PDF) - Maxim Integrated
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MAX9512ATE Datasheet PDF : 19 Pages
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Video Filter Amplifier with SmartSleep
and Y/C Mixer Circuit
AC-Coupling the Outputs
The outputs can be AC-coupled since the output stage
can source and sink current as shown in Figure 6.
Coupling capacitors should be 220µF or greater to keep
the highpass filter formed by the 150Ω equivalent resis-
tance of the video transmission line to a corner frequen-
cy of 4.8Hz or below. The frame rate of PAL systems is
25Hz, and the frame rate of NTSC systems is 30Hz. The
corner frequency should be well below the frame rate.
Smartsleep only works with DC-coupled loads.
Power-Supply Bypassing and Ground
The MAX9512 operates from a single-supply voltage
down to 2.7V, allowing for low-power operation. Bypass
VDD to GND with a 0.1µF capacitor. Place all external
components as close to the device as possible.
VIDEO ENCODER
CURRENT
DAC
CURRENT
DAC
+3.3V
BUFFER
CIN
LPF
0.1μF
VDD
LOAD SENSE
6dB
COUT
75Ω
220μF
CHROMA
BUFFER
YIN
LPF
LOAD SENSE
6dB
YOUT
75Ω
220μF
LUMA
0V
+3.3V
SMARTSLEEP
SHDN
ACTIVE VIDEO
DETECT
CONTROL
LOGIC
MAX9512
Figure 6. AC-Coupling at the Outputs
LOAD SENSE
6dB
75Ω
CVBSOUT1
220μF
CVBS1
LOAD SENSE
6dB
CVBSOUT2 75Ω
220μF
CVBS2
GND
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