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參數(shù)資料
| 型號(hào)： | ISL59532IKEZ |
| 廠商： | INTERSIL CORP |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | 32x32 Video Crosspoint |
| 中文描述： | 32-CHANNEL, CROSS POINT SWITCH, PBGA356 |
| 封裝： | 27 X 27 MM, 1.27 MM PITCH, ROHS COMPLIANT, PLASTIC, MS-034A-BAL-2, BGA-356 |
| 文件頁(yè)數(shù)： | 21/24頁(yè) |
| 文件大小： | 1312K |
| 代理商： | ISL59532IKEZ |
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21
FN7432.3
July 24, 2006
For this reason, the ISL59532 must be in DC-coupled
mode (Clamp Disabled) to be compatible with s-video
and component video signals.
Bandwidth Considerations
Wide frequency response (high bandwidth) in a video
system means better video resolution. Four sets of
frequency response curves are shown in Figure 47.
Depending on the switch configurations, and the routing (the
path from the input to the output), bandwidth can vary
between 100MHz and 350MHz. A short discussion of the
trade-offs — including matrix configuration, output buffer
gain selection, channel selection, and loading — follows.
In multiplexer mode, one input typically drives one output
channel, while in broadcast mode, one input drives all 32
outputs. As the number of outputs driven increases, the
parasitic loading on that input increases. Broadcast Mode is
the worst-case, where the capacitance of all 32 channels
loads one input, reducing the overall bandwidth. In addition,
due to internal device compensation, an output buffer gain of
x2 has higher bandwidth than a gain of x1. Therefore, the
highest bandwidth configuration is multiplexer mode (with
each input mapped to only one output) and an output buffer
gain of x2.
The relative locations of the input and output channels also
have significant impact on the device bandwidth (due to the
layout of the ISL59530 silicon). When the input and output
channels are further away, there are additional parasitics as
a result of the additional routing, resulting in lower
bandwidth.
The bandwidth does not change significantly with resistive
loading as shown in the typical performance curves.
However several of the curves demonstrate that frequency
response is sensitive to capacitance loading. This is most
significant when laying out the PCB. If the PCB trace length
between the output of the crosspoint switch and the back-
termination resistor is not minimized, the additional parasitic
capacitance will result in some peaking and eventually a
reduction in overall bandwidth.
Linear Operating Region
In addition to bandwidth optimization, to get the best linearity
the ISL59532 should be configured to operate in its most
linear operating region. Figure 48 shows the differential gain
curve. The ISL59532 is a single supply 5V design with its
most linear region between 0.1 and 2V. This range is fine for
most video signals whose nominal signal amplitude is 1V.
The most negative input level (the sync tip for composite
video) should be maintained at 0.3V or above for best
operation.
In a DC-coupled application, it is the system designer’s
responsibility to ensure that the video signal is always in the
optimum range.
When AC coupling, the ISL59532’s DC restore function
automatically adjusts the DC level so that the most negative
portion of the video is always equal to V
REF
.
A discussion of the benefits of the DC-restored system
begins by understanding the block diagram of a typical
DC-restore circuit (Figure 49). It consists of 4 sections: an
AC coupling (DC blocking) capacitor at the input, an opamp,
a FET switch, and a current source. In the absence of an
input signal, R
TERM
pulls the input node to ground. The 2
μ
A
current source slowly drains the input capacitor of charge,
slowly lowering V
OUT
. However when V
OUT
goes below
V
REF
, Q1 turns on, sourcing current into the capacitor until
V
OUT
is equal to V
REF
, at which point Q1 will turn off. So
with no V
IN
signal, the voltage at the noninverting input of
the opamp will settle to approximately V
REF
, with Q1
sourcing the same 2
μ
A as the current source.
1
10
100
1000
2
0
-2
-4
-6
-8
-10
N
Frequency [MHz]
Mux, Av = 2
Mux, Av = 1
Broadcast,
Av = 1
Broadcast,
Av = 2
FIGURE 47. FREQUENCY RESPONSE FOR VARIOUS MODES
FIGURE 48. DIFFERENTIAL GAIN RESPONSE
ISL59532
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| ISL5957IAZ | 14-Bit, +3.3V, 260+MSPS, High Speed D/A Converter |
| ISL5957IB | 14-Bit, +3.3V, 260+MSPS, High Speed D/A Converter |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL59533 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:32x32 Video Crosspoint with Differential Inputs |
| ISL59533IKEZ | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:32x32 Video Crosspoint with Differential Inputs |
| ISL59534 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:32x16 Video Crosspoint |
| ISL59534_0708 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:32x16 Video Crosspoint |
| ISL59534IKEZ | 功能描述:IC CROSSPOINT SW 32X16 356BGA RoHS:是 類別:集成電路 (IC) >> 接口 - 模擬開(kāi)關(guān)，多路復(fù)用器，多路分解器 系列:- 應(yīng)用說(shuō)明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:250 系列:- 功能:開(kāi)關(guān) 電路:單刀單擲 導(dǎo)通狀態(tài)電阻:48 歐姆 電壓電源:單電源 電壓 - 電源，單路/雙路(±):2.7 V ~ 5.5 V 電流 - 電源:5µA 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:48-LQFP 供應(yīng)商設(shè)備封裝:48-LQFP（7x7） 包裝:托盤 |
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