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參數(shù)資料
| 型號(hào)： | AD8117 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Video Crosspoint Switch Video Crosspoint Switch |
| 中文描述： | 視頻交叉點(diǎn)開關(guān)視頻交叉點(diǎn)開關(guān) |
| 文件頁數(shù)： | 25/32頁 |
| 文件大?。?/td> | 488K |
| 代理商： | AD8117 |
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Preliminary Technical Data
AD8117/AD8118
each output stage driving a load, subtract a quiescent power
according to
Rev. PrA | Page 25 of 32
For the AD8117/AD8118,
I
OUTPUT, QUIESCENT
= 1.65 mA for each
single-ended output pin.
For each disabled output, the quiescent power supply current in
VPOS and VNEG drops by approximately 9 mA.
I
O,QUIESCENT
QPNP
QNPN
V
POS
I
O,QUIESCENT
V
NEG
V
OUTPUT
I
OUTPUT
Figure 28. Simplified Output Stage
An example:
AD8117, in an ambient temperature of 85°C,
with all 32 outputs driving 1 V rms into 100 Ω loads. Power
supplies are ± 2.5 V.
Step 1. Calculate power dissipation of AD8117 using data
sheet quiescent currents. We are neglecting V
DD
current as it is insignificant.
P
D, QUIESCENT
= (
V
POS
×
I
VPOS
) + (
V
NEG
×
I
VNEG
)
Step 2. Calculate power dissipation from loads. For a
differential output and ground-referenced load, the
output power is symmetrical in each output phase.
There are 32 output pairs, or 64 output currents.
Step 3. Subtract quiescent output stage current for number
of loads (64 in this example). The output stage is
either standing, or driving a load but the current
only needs to be counted once (valid for output
voltages > 0.5 V).
There are 32 output pairs, or 64 output currents.
nP
D, OUTPUT
= 64 × 8.25 mW = 0.53 W
Step 4. Verify that the power dissipation does not exceed
maximum allowed value.
From the figure or the equation, this power dissipation is
below the maximum allowed dissipation for all ambient
temperatures up to and including 85°C.
Short Circuit Output Conditions
Although there is short-circuit current protection on the
AD8117 outputs, the output current can reach values of 80 mA
into a grounded output. Any sustained operation with too
many shorted outputs can exceed the maximum die
temperature and can result in device failure (see Absolute
Maximum Ratings).
Crosstalk
Many systems, such as broadcast video and KVM switches, that
handle numerous analog signal channels, have strict
requirements for keeping the various signals from influencing
any of the others in the system. Crosstalk is the term used to
describe the coupling of the signals of other nearby channels to
a given channel.
When there are many signals in close proximity in a system, as
will undoubtedly be the case in a system that uses the
AD8117/AD8118, the crosstalk issues can be quite complex. A
good understanding of the nature of crosstalk and some
definition of terms is required in order to specify a system that
uses one or more crosspoint devices.
Types of Crosstalk
Crosstalk can be propagated by means of any of three methods.
These fall into the categories of electric field, magnetic field,
and sharing of common impedances. This section will explain
these effects.
Every conductor can be both a radiator of electric fields and a
receiver of electric fields. The electric field crosstalk mechanism
occurs when the electric field created by the transmitter
propagates across a stray capacitance (e.g., free space) and
couples with the receiver and induces a voltage. This voltage is
an unwanted crosstalk signal in any channel that receives it.
P
D, ON-CHIP
=
P
D, QUIESCENT
+
nP
D, OUTPUT
+
nP
DQ, OUTPUT
P
D, ON-CHIP
= 2.5 W + 0.96 W – 0.53 W = 2.9 W
P
DQ, OUTPUT
= (
V
POS
–
V
NEG
) ×
I
O, QUIESCENT
P
DQ, OUTPUT
= (2.5 V
– (–2.5V)) × (1.65 mA) = 8.25 mW
nP
D, OUTPUT
= 64 × 15 mW = 0.96 W
P
D, OUTPUT
= (
V
POS
–
V
OUTPUT, RMS
) ×
I
OUTPUT, RMS
– 1 V) × (1 V/150 Ω) = 10 mW
P
D, OUTPUT
= (2.5 V
– 1 V) × (1 V/100 Ω) = 15 mW
P
D, QUIESCENT
= (2.5 V
× 500 mA) + (2.5 V
× 500 mA) = 2.5 W
P
D, OUT, Q
= (
V
POS
–
V
NEG
) ×
I
OUTPUT, QUIESCENT
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD8117_07 | 制造商:AD 制造商全稱:Analog Devices 功能描述:600 MHz, 32 】 32 Buffered Analog Crosspoint Switch |
| AD8117ABPZ | 功能描述:IC CROSSPOINT SWIT 32X32 304BGA RoHS:是 類別:集成電路 (IC) >> 接口 - 模擬開關(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) |
| AD8117-EVAL | 制造商:AD 制造商全稱:Analog Devices 功能描述:600 MHz, 32 】 32 Buffered Analog Crosspoint Switch |
| AD8118 | 制造商:AD 制造商全稱:Analog Devices 功能描述:600 MHz, 32 】 32 Buffered Analog Crosspoint Switch |
| AD8118ABPZ | 功能描述:IC CROSSPOINT SWIT 32X32 304BGA RoHS:是 類別:集成電路 (IC) >> 接口 - 模擬開關(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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