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參數(shù)資料
| 型號： | AD8151-EVAL |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | GPA/SK 300X280X1,5... |
| 中文描述： | 33 × 17，3.2 Gb / s的數(shù)字交叉點(diǎn)開關(guān) |
| 文件頁數(shù)： | 19/36頁 |
| 文件大小： | 5326K |
| 代理商： | AD8151-EVAL |
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AD8151
–19–
REV. 0
Power Supplies
There are several options for the power supply voltages for the
AD8151, as there are two separate sections of the chip that require
power supplies. These are the control logic and the high-speed
data paths. Depending on the system architecture, the voltage
levels of these supplies can vary.
Logic Supplies
The control (programming) logic is CMOS and is designed to
interface with any of the various standard single-ended logic
families (CMOS or TTL). Its supply voltage pins are V
DD
(Pin
170, logic positive) and V
SS
(Pin 152, logic ground). In all cases
the logic ground should be connected to the system digital ground.
V
DD
should be supplied at between 3.3 V to 5 V to match the
supply voltage of the logic family that is used to drive the logic
inputs. V
DD
should be bypassed to ground with a 0.1
μ
F ceramic
capacitor. The absolute maximum voltage from V
DD
to V
SS
is 5.5 V.
Data Path Supplies
The data path supplies have more options for their voltage lev-
els. The choices here will affect several other areas, like power
dissipation, bypassing, and common mode levels of the inputs
and outputs. The more positive voltage supply for the data paths
is V
CC
(Pins 41, 98, 149 and 171). The more negative supply is
V
EE
, which appears on many pins that will not be listed here.
The maximum allowable voltage across these supplies is 5.5 V.
The
fi
rst choice in the data path power supplies is to decide
whether to run the device as ECL (Emitter-Coupled Logic) or
PECL (Positive ECL). For ECL operation, V
CC
will be at ground
potential, while V
EE
will be at a negative supply between
–
3.3 V
to
–
5 V. This will make the common-mode voltage of the inputs
and outputs at a negative voltage, see Figure 15.
DATA
PATHS
CONTROL
LOGIC
+3.3V TO +5V
–
3.3V TO
–
5V
V
SS
V
EE
GND
GND
0.1 F
(ONE FOR EVERY TWO V
EE
PINS)
0.1 F
AD8151
V
DD
V
CC
Figure 15. Power Supplies and Bypassing for ECL
Operation
If the data paths are to be dc-coupled to other ECL logic devices
that run with ground as the most positive supply and a negative
voltage for V
EE
, then this is the proper way to run. However, if
the part is to be ac-coupled, it is not necessary to have the input/
output common mode at the same level as the other system
circuits, but it will probably be more convenient to use the same
supply rails for all devices.
For PECL operation, V
EE
will be at ground potential and V
CC
will be a positive voltage from 3.3 V to 5 V. Thus, the common
mode of the inputs and outputs will be at a positive voltage.
These can then be dc-coupled to other PECL operated devices.
If the data paths are ac-coupled, then the common-mode levels
do not matter, see Figure 16.
DATA
PATHS
CONTROL
LOGIC
+3.3V TO +5V
+3.3V TO +5V
V
SS
V
EE
GND
GND
0.1 F
(ONE FOR EACH V
CC
PIN,
4 REQUIRED)
0.1 F
AD8151
V
DD
V
CC
Figure 16. Power Supplies and Bypassing for PECL
Operation
POWER DISSIPATION
For analysis, the power dissipation of the AD8151 can be divided
into three separate parts. These are the control logic, the data
path circuits and the (ECL or PECL) outputs, which are part of
the data path circuits, but can be dealt with separately. The
fi
rst
of these, the control logic, is CMOS technology and does not
dissipate a signi
fi
cant amount of power. This power will, of
course, be greater when the logic supply is 5 V rather than 3 V,
but overall it is not a signi
fi
cant amount of power and can be
ignored for thermal analysis.
DATA
PATHS
CONTROL
LOGIC
V
SS
V
EE
GND
GND
AD8151
V
DD
V
CC
I, DATA PATH
LOGIC
V
OUT
LOW
–
V
EE
R
OUT
I
OUT
Figure 17. Major Power Consumption Paths
The data path circuits operate between the supplies V
CC
and
V
EE
. As described in the power supply section, this voltage can
range from 3.3 V to 5 V. The current consumed by this section
will be constant, so operating at a lower voltage can save about
35 percent in power dissipation.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD8151XSTZ | 功能描述:IC CROSSPOINT SWITCH 制造商:analog devices inc. 系列:* 零件狀態(tài):上次購買時間 標(biāo)準(zhǔn)包裝:1 |
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| AD8152-EVAL | 制造商:Analog Devices 功能描述:EVAL KIT FOR ASYNCH DGTL CROSSPOINT SWIT - Bulk |
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| AD8152JBPZ | 功能描述:IC CROSSPOINT SWIT 34X34 256BGA 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:XStream™ 應(yīng)用說明: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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