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參數(shù)資料
| 型號： | ISL59530IRZ |
| 廠商： | Intersil |
| 文件頁數(shù)： | 16/26頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC VIDEO CROSSPOINT SWITCH 72QFN |
| 標(biāo)準(zhǔn)包裝： | 168 |
| 功能： | 視頻交叉點(diǎn)開關(guān) |
| 電路： | 1 x 16:16 |
| 電流 - 電源： | 320mA |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 72-WFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 72-QFN（10x10） |
| 包裝： | 托盤 |
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23
FN6220.8
April 13, 2011
This is how the video is “DC-restored” after being
AC-coupled into the ISL59530. The sync tip voltage will be
equal to VREF on the right side of C1, regardless of the DC
level of the video on the left side of C1. Due to various
sources of offset in the actual clamp function, the actual sync
tip level is typically about 75mV higher than VREF (for
VREF = 0.4V).
It is important to choose the correct value for CIN. Too small a
value will generate too much droop, and the image will be
visibly darker on the right than on the left. A CIN value that is too
large may cause the clamp to fail to converge. The droop rate
(dV/dt) is i1/CIN volts/second. In general, the droop voltage
should be limited to <1 IRE over a period of one line of video; so
for 1 IRE = 7mV, IB = 10A maximum, and an NTSC waveform
the result of CIN = 0.1F delivering acceptable droop and
CIN = 0.001F producing excessive droop.
When the clamp function is disabled in the CONTROL
register (Clamp = 0) to allow DC-coupled operation, the
ICLAMP current sinks/sources are disabled and the input
passes through the DC-restore block unaffected. In this
application, VREF may be tied to GND.
Overlay Operation
The ISL59530 features an overlay feature that allows an
external video signal or DC level to be inserted in place of
that output channel’s video. When the OVERN signal is
taken high, the output signal on the OUTN pin is replaced
with the signal on the VOVERN pin.
There are several ways the overlay feature can be used.
Toggling the OVERN signal at the frame rate or slower will
replace the video frame(s) on the OUTN pin with the video
supplied on the VOVERN pin.
Another option (for OSD displays, for example), is to put a
DC level on the VOVERN line and toggle the OVERN signal
at the pixel rate to create a monocolor image “overlaid” on
Channel N’s output signal.
Finally, by enabling the OVERN signal for some portion of
each line over a certain amount of lines, a picture-in-picture
function can be constructed.
It’s important to note that the overlay inputs do not have the
DC-restore function previously described - the overlay signal
is DC-coupled into the output. It is the system designer’s
responsibility to ensure that the video levels are in the
ISL59530’s linear region and matching the output channel’s
offset and amplitude. One easy way to do this is to run the
video to be overlaid through one of the ISL59530’s unused
channels and then into the VOVERN input.
The OVERN pins all have weak pull-downs, so if they are
unused, they can either be left unconnected or tied to GND.
Power Dissipation and Thermal Resistance
With a large number of switches, it is possible to exceed the
+150°C absolute maximum junction temperature under
certain load current conditions. Therefore, it is important to
calculate the maximum junction temperature for an
application to determine if load conditions or package types
need to be modified to assure operation of the crosspoint
switch in a safe operating area.
The maximum power dissipation allowed in a package is
determined according to Equation 1:
Where:
TJMAX = Maximum junction temperature = +125°C
TAMAX = Maximum ambient temperature = +85°C
θJA = Thermal resistance of the package
VIDEOIN
VREF
INPUT
TO
BUFFER
CLAMP
ENABLE
R1
INx
Q1
D1
D2
Q2
C1
(110A)
~0.4V
0.1F
C2
D3
SS12
75
i1
FIGURE 49. DC-RESTORE BLOCK DIAGRAM
FIGURE 50. DC-RESTORE VIDEO WAVEFORMS
CIN = 100nF
CIN = 1nF
PDMAX
TJMAX TAMAX
–
Θ
JA
---------------------------------------------
=
(EQ. 1)
ISL59530
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