參數(shù)資料
型號(hào)： MAX4358ECE+T
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 32/43頁(yè)
文件大小： 0K
描述： IC VIDEO CROSSPOINT SWIT 144TQFP
產(chǎn)品變化通告： Product Discontinuation 28/Nov/2011
標(biāo)準(zhǔn)包裝： 250
功能： 視頻交叉點(diǎn)開(kāi)關(guān)
電路： 1 x 32:16
電壓電源： 單/雙電源
電壓 - 電源，單路/雙路(±)： 5V，± 3 V ~ 5 V
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 144-TQFP
供應(yīng)商設(shè)備封裝： 144-TQFP（20x20）
包裝： 帶卷 (TR)
MAX4358
32 x 16 Nonblocking Video Crosspoint Switch
with On-Screen Display Insertion and I/O Buffers
38
______________________________________________________________________________________
Resistor vs. Capacitive Load. A lowpass filter is created
from the series resistor and parasitic capacitance to
ground. A single R-C do not affect the performance at
video frequencies, but in a very large system there may
be many R-Cs cascaded in series. The cumulative
effect is a slight rolling off of the high frequencies caus-
ing a "softening" of the picture. There are two solutions
to achieve higher performance. One way is to design
the PC board traces associated with the outputs such
that they exhibit some inductance. By routing the traces
in a repeating "S" configuration, the traces that are
nearest each other will exhibit a mutual inductance
increasing the total inductance. This series inductance
causes the amplitude response to increase or peak at
higher frequencies, offsetting the rolloff from the para-
sitic capacitance. Another solution is to add a small-
value inductor to the output.
On-Screen Display Insertion
The MAX4358 facilitates the insertion of on-screen
graphics and characters by using the built-in fast 2:1
multiplexer associated with each of the 16 outputs
(Functional Diagram). This mux switches in 40ns, much
less than the width of a single pixel. Access to this fast
mux is through 16 dedicated OSDFILL analog inputs
and 16 dedicated OSDKEY input controls. OSD timing
is externally controlled and applied to the OSDKEY
inputs (Figure 1). Pulling OSDKEYi low switches the
signal on the OSDFILLi input to the OUTi output. When
the OSDKEY signal is logic high, the signal at IN_ is
switched to the output. This switching action is repeat-
ed on a pixel-by-pixel basis for each scan line. In this
way any synchronized video signal, including arbitrary
graphics, can be inserted on the screen (Figure 9).
This technique for inserting OSD display information is
an improvement over the way it has traditionally been
done. Other OSD techniques require an external fast
mux and a buffer for each output.
Crosstalk and Board Routing Issues
Improper signal routing causes performance problems.
The MAX4358 has a typical crosstalk rejection of
-62dB at 6MHz. A bad PC board layout degrades the
crosstalk rejection by 20dB or more. To achieve the
best crosstalk performance:
1. Place ground isolation between long critical signal
PC board trace runs. These traces act as a shield to
potential interfering signals. Crosstalk can be
degraded from parallel traces as well as directly
above and below on adjoining PC board layers.
Table 7. 7-Bit Serial Control Word Bit Assignments (Mode 1: Complete Matrix Mode
Programming)
BIT
NAME
FUNCTION
6 (MSB)
Output Enable
Enable bit for output, 0 = disable, 1 = enable.
5
Gain Set
Gain Select for output buffer, 0 = gain of +1V/V, 1 = gain of +2V/V.
4
Input Address 4
MSB of input channel select address.
3
Input Address 3
2
Input Address 2
1
Input Address 1
0 (LSB)
Input Address 0
LSB of input channel select address
OSD
OUT0
SYNC0
SYNC1
SYNC0
OSDFILL0
OSDKEY0
OSDFILL1
OSDKEY1
OSDFILL15
OSDKEY15
SYNC1
SYNC15
OUT1
OUT15
IN0
CAMERAS
COMPUTER CONTROL
IN1
IN31
MAX4358
OSD
MEMORY
MONITOR
Figure 9. Improved Implementation of On-Screen Display
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