參數(shù)資料
型號(hào)： AD8177ABPZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 25/40頁(yè)
文件大?。?/td> 0K
描述： IC VIDEO CROSSPOINT SWIT 676BGA
標(biāo)準(zhǔn)包裝： 1
功能： 視頻交叉點(diǎn)開(kāi)關(guān)
電路： 3 x 16:5
電壓電源： 單/雙電源
電壓 - 電源，單路/雙路(±)： 4.5 V ~ 5.5 V，±2.5V
電流 - 電源： 460mA
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 676-BGA
供應(yīng)商設(shè)備封裝： 676-BGA（27x27）
包裝： 管件
AD8177
Rev. 0 | Page 31 of 40
For example, to achieve best dynamic performance, the undriven
input should be terminated with an impedance matching that seen
by the part at the driven input.
Differential Output
Benefits of Differential Operation
The AD8177 has a fully-differential switch core with differential
outputs. The two output voltages move in opposite directions,
with a differential feedback loop maintaining a fixed output
stage differential gain of +2. This differential output stage
provides improved crosstalk cancellation due to parasitic
coupling from one output to another being equal and out of
phase. Additionally, if the output of the device is utilized in a
differential design, then noise, crosstalk, and offset voltages
generated on-chip that are coupled equally into both outputs
are reduced by the common-mode rejection ratio of the next
device in the signal chain. By utilizing the AD8177 outputs in a
differential application, the best possible noise and offset
specifications can be realized.
Common-Mode Gain
The common mode, or average voltage of pairs of output
signals, is set by the voltage on the VOCM_CMENCOFF pin
when common-mode encoding is off (CMENC is logic low), or
by the voltage on the VOCM_CMENCON pin when common-
mode encoding is on (CMENC is logic high). Note that in the
latter case, VCOM_CMENCON sets the overall common-mode
of RGB triplets of differential outputs, while the individual
common-mode of each RGB output is free to change. VCOM_
CMENCON and VCOM_CMENCOFF are typically set to
midsupply (often ground), but can be moved approximately
±0.5 V to accommodate cases where the desired output common-
mode voltage may not be midsupply (as in the case of unequal
split supplies). Adjusting the output common-mode voltage
beyond ±0.5 V can limit differential swing internally below the
specifications on the data sheet. The overall common mode of
the output voltages follows the voltage applied to VOCM_
CMENCON or VCOM_CMENCOFF, implying a gain of +1.
Likewise, sync-on common-mode signaling is carried through
the AD8177 (CMENC must be in its high state), implying a gain
of +1 for this path, as well.
The common-mode reference pins are analog signal inputs,
common to all output stages on the device. They require only
small amounts of bias current, but noise appearing on these
pins is buffered to all the output stages. As such, they should
be connected to low noise, low impedance voltage references
to avoid being sources of noise, offset, and crosstalk in the
signal path.
Termination
The AD8177 is designed to drive 100 Ω terminated to ground
on each output (or an effective 200 Ω differential) while meeting
data sheet specifications over the specified operating tempera-
ture range, if care is taken to observe the maximum power
derating curves.
Termination at the load end is recommended to shorten settling
time and for best signal integrity. In differential signal paths, it
is often desirable to series-terminate the outputs, with a resistor
in series with each output. A side effect of termination is an
attenuation of the output signal by a factor of two. In this case,
gain is usually necessary somewhere else in the signal path to
restore the signal level.
Whenever a differential output is used single-ended, it is desir-
able to terminate the used single-ended output with a series
resistor, as well as to place a resistor on the unused output to
match the load seen by the used output.
When disabled, the outputs float to midsupply. A small current
is required to drive the outputs away from their midsupply state.
This current is easily provided by an AD8177 output (in its enabled
state) bussed together with the disabled output. Exceeding the
allowed output voltage range may saturate internal nodes in the
disabled output, and consequently, an increase in disabled output
current may be observed.
Single-Ended Output
Usage
The AD8177 output pairs can be used single-ended, taking only
one output and not using the second. This is often desired to
reduce the routing complexity in the design, or because a single-
ended load is being driven directly. This mode of operation
produces good results, but has some shortcomings when compared
to taking the output differentially. When observing the single-
ended output, noise that is common to both outputs appears in
the output signal.
When observing the output as single-ended, the distribution of
offset voltages appears greater. In the differential case, the difference
between the outputs, when the difference between the inputs is
zero, is a small differential offset. This offset is created from
mismatches in devices in the signal path. In the single-ended
case, this differential offset is still observed, but an additional
offset component is also relevant. This additional component is
the common-mode offset, which is the difference between the
average of the outputs and the output common-mode reference.
This offset is created by mismatches that affect the signal path
in a common-mode manner. A differential receiver rejects this
common-mode offset voltage, but in the single-ended case, this
offset is observed with respect to the signal ground. The single-
ended output sums half the differential offset voltage and all of the
common-mode offset voltage for a net increase in observed offset.
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參數(shù)描述
AD8177-EVALZ 制造商:AD 制造商全稱:Analog Devices 功能描述:500 MHz, Triple 16 】 5 Video Crosspoint Switch
AD8178 制造商:AD 制造商全稱:Analog Devices 功能描述:450 MHz, Triple 16 】 5 Video Crosspoint Switch
AD8178ABPZ 功能描述:IC VIDEO CROSSPOINT SWIT 676BGA 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:- 其它有關(guān)文件:STG4159 View All Specifications 標(biāo)準(zhǔn)包裝:5,000 系列:- 功能:開(kāi)關(guān) 電路:1 x SPDT 導(dǎo)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(yīng)商設(shè)備封裝:7-覆晶 包裝:帶卷 (TR)
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