參數(shù)資料
型號(hào)： MAX4455ECQ
廠(chǎng)商： MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi)： 畫(huà)面疊加
英文描述： Triple Differential Transceivers 20-SOIC -40 to 85
中文描述： ON-SCREEN DISPLAY IC, PQFP100
封裝： 14 X 14 MM, 1 MM HEIGHT, TQFP-100
文件頁(yè)數(shù)： 16/30頁(yè)
文件大小： 663K
代理商： MAX4455ECQ
M
Arbitrary Graphics On-Screen Display
Video Generator
16
______________________________________________________________________________________
Applications Information
Interfacing to Maxim Video Crosspoint
Switches
The MAX4455 interfaces directly to MAX4356/MAX4358
video crosspoint switches with OSD insertion function
(Figure 7). The MAX4455 OSDKEY_ and OSDFILL_ out-
puts connect directly to the OSDKEY_ and OSDFILL_
inputs on the MAX4356/MAX4358 and utilize the inter-
nal fast mux in the MAX4356/MAX4358 to implement
the OSD insertion. To ensure correct video timing, the
MAX4455 VIDIN_ input senses and extracts the video
timing directly from the crosspoint switch output.
Interfacing the MAX4455 with a Fast Mux
Switch
The MAX4455 interfaces directly to a fast mux switch, as
shown in Figure 8. Choose a device with a switch time of
less than 30ns, such as the MAX4258, for accurate OSD
insertion. The MAX4258 is a single-channel wideband
video amplifier with input multiplexing and a channel-to-
channel switching time of 20ns. Configure the amplifier
using external resistors for a 6dB gain to drive a 75
back-terminated video line. Connect the OSDFILL_ output
of the MAX4455 to IN0 of the MAX4258 and connect the
video source (camera output) to IN1. Connect the
OSDKEY_ output of the MAX4455 to A0, the channel
select input of the MAX4258. When the OSDKEY_ signal
is low, the OSDFILL_ analog signal on channel IN0 pass-
es through the mux and the OSD information is inserted
into the video image. When the OSDKEY_ signal is high,
the camera video output passes through the mux and is
displayed on the monitor.
Channel Blanking During Video Input
Source Switching
Before switching input video sources on a channel with
active OSD, set the BLANK bit to 1 in the channel sta-
tus register to prevent OSDKEY assertion during the
video blanking interval. Failure to blank the OSD prior
to switching input video sources can cause OSD infor-
mation to be inserted over the new video input
’
s vertical
blanking interval, resulting in a loss of sync on that
channel. The MAX4455 timing synchronizes to the
video output of the channel, such that switching anoth-
er asynchronous input video source can cause writing
of OSD information over the new video source with
unpredictable results (i.e., OSD insertion over the verti-
cal blanking interval).
The channel blanking procedure follows:
1) Set BLANK = 1.
2) Switch camera/video source input.
3) Set BLANK = 0.
PORTION OF
MEMORY
ALLOCATED
TO CHANNEL
MICRO-
CONTROLLER
MEMORY
INTERFACE
VIDEO TIMING
EXTRACTION
AND CONTROL
DIGITAL
LINE
BUFFERS
4-BIT D/A
MAX4455 OSD CHANNEL-N
*OPTIONAL COMPONENTS. USED TO ATTENUATE THE COLOR BURST SIGNAL
OF COLOR CAMERAS TO AVOID FALSE TRIGGERING OF THE SYNC DETECTOR
IN THE MAX4455.
MAX4358
VIDEO
CROSSPOINT
SWITCH
CAMERA
OSDFILL_
(FAST MUX)
OSDKEY_
0.1
μ
F
470pF*
CAMERA
+OSD
CPU
INTERFACE
VIDIN_
V
K1
V
DD
V
DD
SWITCH
MATRIX
75
430
*
Figure 7. Interfacing MAX4455 with MAX4358 Video Crosspoint Switch
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