- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄1892 > AD8113JSTZ (Analog Devices Inc)IC VIDEO CROSSPOINT SWIT 100LQFP PDF資料下載
參數(shù)資料
| 型號： | AD8113JSTZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 10/29頁 |
| 文件大小： | 0K |
| 描述： | IC VIDEO CROSSPOINT SWIT 100LQFP |
| 標準包裝： | 1 |
| 功能： | 音頻/視頻交叉點開關(guān) |
| 電路： | 1 x 16:16 |
| 電壓電源： | 單/雙電源 |
| 電壓 - 電源，單路/雙路(±)： | 4.5 V ~ 5.5 V，±2.25 V ~ 6.3 V |
| 電流 - 電源： | 50mA |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 100-LQFP |
| 供應商設(shè)備封裝： | 100-LQFP（14x14） |
| 包裝： | 托盤 |
| 產(chǎn)品目錄頁面： | 801 (CN2011-ZH PDF) |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁當前第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁
REV. A
AD8113
–17–
Since the data in the shift register is random after power-up, it
should not be used to program the matrix, or the matrix can enter
unknown states. To prevent this, DO NOT APPLY LOGIC
LOW SIGNALS TO BOTH
CE AND UPDATE INITIALLY
AFTER POWER-UP. The shift register should first be loaded
with the desired data, and then
UPDATE can be taken LOW to
program the device.
The
RESET pin has a 20 k
pull-up resistor to DVCC that can
be used to create a simple power-up reset circuit. A capacitor
from
RESET to ground will hold RESET low for some time
while the rest of the device stabilizes. The low condition will
cause all the outputs to be disabled. The capacitor will then
charge through the pull-up resistor to the high state, thus allow-
ing full programming capability of the device.
SPECIFYING AUDIO LEVELS
Several methods are used to specify audio levels. A level is
actually a power measurement, which requires not just a voltage
measurement, but also a reference impedance. Traditionally
both 150
and 600 have been used as references for audio
level measurements.
The typical reference power level is one milliwatt. Power levels
that are measured relative to this reference level are given the
designation dBm. However, it is always necessary to be sure of
the reference impedance used for such measurements. This can
be either explicit, e.g., 0 dBm (600
), or implicit, if there is
certain agreement on what the reference impedance is.
Since modern voltmeters have high input impedances, measure-
ments can be made that do not terminate the signal. Therefore,
it is not proper to consider this type of measurement a dBm, or
power measurement. However, a measurement scale that is
designated dBu is now used to measure unterminated voltages.
This scale has a voltage reference for 0 dBu that is the same as
the voltage required to produce 0 dBm (600
).
Since P = V
2/R, the voltage required to create 1 mW into 600
is 0.775 V rms. This is the voltage reference (0 dB) used for
dBu measurements without regard to the impedance.
The AD8113 operates as a voltage-in, voltage-out device.
Therefore, it is easiest to specify all of its parameters in volts,
and leave it to the user to convert them to other power units or
dB-type measurements as required by the particular application.
CREATING UNITY-GAIN CHANNELS
The channels in the AD8113 have a gain of two. This gain is
necessary as opposed to a gain of unity in order to restrict the
voltage on internal nodes to less than the breakdown voltage. If
it is desired to create channels with an overall gain of unity,
then a resistive divider at the input will divide the signals by
two. After passing through any input/output channel combina-
tion of the AD8113, the overall gain will be unity.
TYPICAL
INPUT
1k
AD8113
G = 2
+12V
–12V
TYPICAL
OUTPUT
UNITY GAIN
AUDIO OUT
AUDIO
SOURCE
Figure 8. Input Divide Circuit
Figure 8 shows a typical input with a divide-by-two input
divider that will create a unity gain channel. The circuit uses 1 k
resistors to form the divider. These resistors need to be high
enough so they will not overload the drive circuit. But if they are
too high, they will generate an offset voltage due to the input bias
current that flows through them. Larger resistors will also increase
the thermal noise of the channel.
This circuit can handle inputs that swing up to
±10 V when
the AD8113 operates on analog supplies of
±12 V. After the
divider, the maximum voltage will be
±5 V at the input. This
maximum input amplitude will be
±10 V at the output after the
gain-of-two of the channel.
VIDEO SIGNALS
Unlike audio signals, which have lower bandwidths and longer
wavelengths, video signals often use controlled-impedance
transmission lines that are terminated in their characteristic
impedance. While this is not always the case, there are some
considerations when using the AD8113 to route video signals with
controlled-impedance transmission lines. Figure 9 shows a sche-
matic of an input and output treatment of a typical video channel.
75
VIDEO
SOURCE
75
AD8113
G = 2
OR +12V
TYPICAL
INPUT
–5V
OR –12V
TYPICAL
OUTPUT
75
TRANSMISSION
LINE
75
Figure 9. Video Signal Circuit
Video signals usually use 75
transmission lines that need to be
terminated with this value of resistance at each end. When such
a source is delivered to one of the AD8113 inputs, the high
input impedance will not properly terminate these signals. There-
fore, the line should be terminated with a 75
shunt resistor to
ground. Since video signals are limited in their peak-to-peak
amplitude, there is no need to attenuate video signals before
they pass through the AD8113.
The AD8113 outputs are very low impedance and will not prop-
erly terminate the source end of a 75
transmission line. In these
cases, a series 75
resistor should be inserted at an output that
will drive a video signal. Then the transmission line should be
terminated with 75
at its far end. This overall termination
scheme will divide the amplitude of the AD8113 output by two.
An overall unity gain channel is produced as a result of the
channel gain-of-two of the AD8113.
Power Considerations of Video Signals
If the AD8113 is used only to route conventional video signals,
runing on analog supplies of
±5 V is recommended. This is all
that is necessary for video signals because they are limited in
their amplitude to generally less than 2 V p-p at the output,
after the channel gain-of-two. There will be significant power
savings when routing video signals with lower supply voltages.
If an AD8113 is used to route a mix of audio and video signals,
then other factors must be considered. In general, the analog
supplies will be at
±12 V to handle the high signal levels required
for the audio.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD8114ASTZ | IC VIDEO CROSSPOINT SWIT 100LQFP |
| AD8116JSTZ | IC VIDEO CROSSPOINT SWIT 128LQFP |
| AD8118ABPZ | IC CROSSPOINT SWIT 32X32 304BGA |
| AD8123ACPZ | IC RCVR TRPL DIFF EQUAL 40LFCSP |
| AD8124ACPZ | IC HS RCVR EQUALIZER 40VFQFN |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD8114 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Cost 225 MHz 16 X 16 Crosspoint Switches |
| AD8114_05 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Cost 225 MHz 16 ?? 16 Crosspoint Switches |
| AD8114AST | 制造商:Analog Devices 功能描述:Analog Video Crosspoint 225MHz 16 x 16 100-Pin LQFP 制造商:Rochester Electronics LLC 功能描述:TQFP 300MHZ 16X16 G=+1 CROSSPOINT SWITCH - Tape and Reel 制造商:Analog Devices 功能描述:Multiplexer IC |
| AD8114ASTZ | 功能描述:IC VIDEO CROSSPOINT SWIT 100LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 模擬開關(guān)，多路復用器，多路分解器 系列:- 其它有關(guān)文件:STG4159 View All Specifications 標準包裝:5,000 系列:- 功能:開關(guān) 電路:1 x SPDT 導通狀態(tài)電阻:300 毫歐 電壓電源:雙電源 電壓 - 電源，單路/雙路(±):±1.65 V ~ 4.8 V 電流 - 電源:50nA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:7-WFBGA，F(xiàn)CBGA 供應商設(shè)備封裝:7-覆晶 包裝:帶卷 (TR) |
| AD8114ASTZ | 制造商:Analog Devices 功能描述:IC SWITCH VIDEO |
發(fā)布緊急采購，3分鐘左右您將得到回復。