参数资料
| 型号： | ISL59534IKEZ |
| 厂商： | Intersil |
| 文件页数： | 13/22页 |
| 文件大小： | 0K |
| 描述： | IC CROSSPOINT SW 32X16 356BGA |
| 标准包装： | 40 |
| 功能： | 视频交叉点开关 |
| 电路： | 1 x 32:16 |
| 电压电源： | 单电源 |
| 电压 - 电源，单路/双路(±)： | 4.5 V ~ 5.5 V |
| 电流 - 电源： | 445mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 356-BBGA 裸露焊盘 |
| 供应商设备封装： | 356-HPBGA（27x27） |
| 包装： | 托盘 |
| 产品目录页面： | 1247 (CN2011-ZH PDF) |
20
FN6249.7
October 10, 2011
0.2% of the video signal. Because 1.3mV is only 0.2% of a
0.7V video signal, this droop is imperceptible to the human
eye.
This is how the video is “DC-restored” after being AC
coupled into the ISL59534. 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 we will set CIN > 10A*60s/7mV =
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 ISL59534 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 ISL59534’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 ISL59534’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:
FIGURE 49. DC RESTORE BLOCK DIAGRAM
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 50. DC RESTORE VIDEO WAVEFORMS
PD
MAX
T
JMAX
T
AMAX
–
Θ
JA
---------------------------------------------
=
(EQ. 1)
ISL59534
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