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參數(shù)資料
| 型號(hào)： | MAX7481 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Bidirectional Video Filters/Buffers for Composite and S-Video Portable Media Devices |
| 中文描述： | 雙向視頻濾波器/緩沖器，用于復(fù)合視頻及S端子便攜式多媒體產(chǎn)品 |
| 文件頁數(shù)： | 7/13頁 |
| 文件大?。?/td> | 872K |
| 代理商： | MAX7481 |
M
Bidirectional Video Filters/Buffers for Composite
and S-Video Portable Media Devices
_______________________________________________________________________________________
7
device, such as a display in playback mode. In playback
mode, internal switches S1, S2, S4, and S5 close the path
from the video processor to the filter upon driving
CVBSON and/or YCON high. Driving either YCON or
CVBSON high enables the signal path from the video
processor through the filter. Switches S6, S7, and S8 are
open and not in the signal path in playback mode.
Driving YCON high drives the Y signal to OUT1 and C
signal to OUT2 while enabling CVBSON combines the Y
and C signals to form composite video and output on
OUT3. Both composite and Y/C video can be active in
this mode. Pull
P
/R low for playback mode.
Record Mode
Record mode takes the video signal from an external
video source and provides anti-aliasing for both com-
posite and Y/C signals. Figure 5 shows the signal flow
from the external video source to the video processor.
Upon driving
P
/R high, switches S1, S2, S4, and S5
change states so that the signals utilize the same filters
and now route to the video processor. Switches S6, S7,
and S8 all close to ground so that the incoming signal
sees a 75
Ω
load termination to ground. The inputs IN3,
IN4, and IN5 are AC-coupled with a 0.1μF capacitor
that works with an internal clamping circuit. Enabling
CVBSON drives the video signal from IN5 through the
upper filter and outputs at OUT4. In this mode, OUT5 is
disabled and pulled to GND. Enabling YCON drives the
Y signal from IN3 through the upper filter to output at
OUT4 and the C signal from IN4 through the lower filter
to output at OUT5. Switch S3 connects OUT4 to either
the Y channel if YCON is high, or the composite video
channel if CVBSON is high. Driving both CVBSON and
YCON high results in an invalid state, resulting in all
output buffers shutting down and pulling to GND.
Connection Sharing for Inputs and Outputs
Outputs OUT1, OUT2, and OUT3 and inputs IN3, IN4,
and IN5 can share one connector to save space.
Figure 6 shows a possible interface at OUT1/OUT2/
OUT3 and IN3/IN4/IN5. In record mode, the switch
closes, OUT1/OUT2/OUT3 go to GND, and the external
75
Ω
resistor looks like a load-termination resistor.
Figure 4 shows that in playback mode, IN3/IN4/IN5 are
not used and the switches to GND are open. The exter-
nal 75
Ω
resistor serves as a back-termination resistor in
playback mode and provides the cable termination in
record mode.
Bidirectional Video Filter and Buffer
The MAX7481/MAX7482 output buffers are designed to
drive both Y/C channels as well as composite video.
The output buffers use the internally generated nega-
tive supply to shift the blanking level of video outputs
(composite and Y only) to ground so that the active
video signal is above ground and the negative sync
pulse is below ground. The C signal is shifted so that it
is centered at GND. The output buffers are capable of
driving a full 2V
P-P
video signal into a standard 150
Ω
load DC-coupled to GND. The output buffers can drive
an AC-coupled load provided that the load impedance
is greater than 5k
Ω
.
The MAX7481/MAX7482 utilize the same filter in both
playback and record modes by using switches that route
the signals through different paths in the two modes (see
Figure 3). Switches S1–S8 change states depending on
the mode of operation and control input settings. The use
of these internal switches enables utilizing a single filter in
both modes for a unique solution in space constrained
and cost-sensitive applications.
INPUT
500mV/div
OUTPUT
500mV/div
2ms/div
Figure 1. AC-Coupled Output
INPUT
500mV/div
OUTPUT
1V/div
2ms/div
0V
0V
Figure 2. DirectDrive Output
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| MAX7482 | Bidirectional Video Filters/Buffers for Composite and S-Video Portable Media Devices |
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| MAX7481ETI+ | 制造商:Maxim Integrated Products 功能描述:HIGH-SPEED, LOW-VOLTAGE, 0.7O CMOS ANALOG SWITCHES/MULTIPLEX - Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
| MAX7482ETI+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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| MAX748ACPA | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 3.3V Step-Down DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
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