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參數(shù)資料
| 型號： | AD8151ASTZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 11/40頁 |
| 文件大小： | 0K |
| 描述： | IC CROSSPOINT SWIT 33X17 184LQFP |
| 標準包裝： | 1 |
| 系列： | XStream™ |
| 功能： | 交叉點開關(guān) |
| 電路： | 1 x 33:17 |
| 電壓電源： | 雙電源 |
| 電壓 - 電源，單路/雙路(±)： | ±3 V ~ 5.25 V |
| 工作溫度： | 0°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 184-LQFP |
| 供應(yīng)商設(shè)備封裝： | 184-LQFP（20x20） |
| 包裝： | 托盤 |
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AD8151
Rev. B | Page 19 of 40
CIRCUIT DESCRIPTION
The AD8151 is a high speed 33 × 17 differential crosspoint
switch designed for data rates up to 3.2 Gbps per channel. The
AD8151 supports PECL-compatible input and output levels
when operated from a 5 V supply (VCC = 5 V, VEE = GND), or
ECL-compatible levels when operated from a –5 V supply
(VCC = GND, VEE = –5 V). To save power, the AD8151 can run
from a +3.3 V supply to interface with low voltage PECL
circuits or a –3.3 V supply to interface with low voltage ECL
circuits. The AD8151 utilizes differential current-mode outputs
with an individual disable control, which facilitates busing the
outputs of multiple AD8151s together to assemble larger switch
arrays. This feature also reduces system crosstalk and can
greatly reduce power dissipation in a large switch array. A single
external resistor programs the current for all enabled output
stages, allowing user control over output levels with different
output termination schemes and transmission line
characteristic impedances.
High Speed Data Inputs (INxxP, INxxN)
The AD8151 has 33 pairs of differential voltage-mode inputs.
The common-mode input range extends from the positive
supply voltage (VCC) down to include standard ECL or PECL
input levels (VCC – 2 V). The minimum differential input
voltage is 200 mV. Unused inputs may be connected directly to
any level within the allowed common-mode input range. A
simplified schematic of the input circuit is shown in Figure 33.
02169-033
VCC
VEE
INxxP
INxxN
Figure 33. Simplified Input Circuit
To maintain signal fidelity at the high data rates supported by
the AD8151, the input transmission lines should be terminated
as close to the input pins as possible. The preferred input
termination structure depends primarily on the application and
the output circuit of the data source. Standard ECL components
have open emitter outputs that require pull-down resistors.
Three input termination networks suitable for this type of
source are shown in Figure 34. The characteristic impedance of
the transmission line is shown as ZO. The resistors, R1 and R2,
in the Thevenin termination are chosen to synthesize a VTT
source with an output resistance of ZO and an open-circuit
output voltage equal to VCC – 2 V. The load resistors (RL) in the
differential termination scheme are needed to bias the emitter
followers of the ECL source.
02169-034
(b)
INxxP
INxxN
ZO
R2
R1
ECL SOURCE
VCC
VCC – 2V
VEE
(a)
INxxP
INxxN
ECL SOURCE
VCC
VTT = VCC – 2V
ZO
(c)
INxxP
INxxN
ECL SOURCE
VCC
VEE
RL
ZO
2ZO
Figure 34. AD8151 Input Termination from ECL/PECL Sources: (a) Parallel
Termination Using VTT Supply, (b) Thevenin Equivalent Termination,
and (c) Differential Termination
If the AD8151 is driven from a current-mode output stage such
as another AD8151, the input termination should be chosen to
accommodate that type of source, as explained in the following
section.
High speed Data Outputs (OUTyyP, OUTyyN)
The AD8151 has 17 pairs of differential current-mode outputs.
The output circuit, shown in Figure 35, is an open-collector
NPN current switch with resistor-programmable tail current
and output compliance extending from the positive supply
voltage (VCC) down to standard ECL or PECL output levels
(VCC 2 V). The outputs can be disabled individually to permit
outputs from multiple AD8151s to be connected directly. Since
the output currents of multiple enabled output stages sum when
directly connected, care should be taken to ensure that the
output compliance limit is not exceeded at any time by disabling
the active output driver before enabling an inactive driver.
02169-035
VCC
VEE
VCC – 2V
IOUT
VEE
DISABLE
OUTyyP
OUTyyN
Figure 35. Simplified Output Circuit
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相關(guān)代理商/技術(shù)參數(shù) |
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| AD8151-EVAL | 制造商:Analog Devices 功能描述:EVAL KIT FOR 33 17, 3.2 GBPS DGTL CROSSPOINT SWIT - Bulk |
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| AD8152JBP | 功能描述:IC CROSSPOINT SWIT 34X34 256BGA RoHS:否 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™ 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(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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