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參數(shù)資料
| 型號(hào)： | ADG438FBR |
| 廠商： | Analog Devices Inc |
| 文件頁(yè)數(shù)： | 5/16頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC MULTIPLEXER 8X1 16SOIC |
| 產(chǎn)品培訓(xùn)模塊： | Switch Fundamentals |
| 標(biāo)準(zhǔn)包裝： | 48 |
| 功能： | 多路復(fù)用器 |
| 電路： | 1 x 8:1 |
| 導(dǎo)通狀態(tài)電阻： | 270 歐姆 |
| 電壓電源： | 雙電源 |
| 電壓 - 電源，單路/雙路(±)： | ±15V |
| 電流 - 電源： | 50µA |
| 工作溫度： | -40°C ~ 105°C |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SOIC N |
| 包裝： | 管件 |
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ADG438F/ADG439F
Rev. E | Page 13 of 16
THEORY OF OPERATION
overvoltages from 40 V to +55 V, irrespective of whether the
power supplies are present or not. Each channel of the multiplexer
consists of an n-channel MOSFET, a p-channel MOSFET, and
an n-channel MOSFET, connected in series. When the analog
input exceeds the power supplies, one of the MOSFETs saturates,
limiting the current. The current during a fault condition is
determined by the load on the output. Figure 31 illustrates the
channel architecture that enables these multiplexers to with-
stand continuous overvoltages.
When an analog input of VSS + 2.2 V to VDD – 2.2 V (output loaded,
behaves as a standard multiplexer, with specifications similar to
a standard multiplexer, for example, the on-resistance is 270 Ω
typically. However, when an overvoltage is applied to the device,
one of the three MOSFETs saturates.
MOSFETs for the various overvoltage situations. When the
analog input applied to an on channel approaches the positive
power supply line, the n-channel MOSFET saturates because
the voltage on the analog input exceeds the difference between
VDD and the n-channel threshold voltage (VTN). When a voltage
more negative than VSS is applied to the multiplexer, the p-channel
MOSFET saturates because the analog input is more negative
than the difference between VSS and the p-channel threshold
voltage (VTP). Because VTN is nominally 1.4 V and VTP 1.4 V,
the analog input range to the multiplexer is limited to VSS + 1.4 V
to VDD 1.4 V (output open circuit) when a ±15 V power supply
is used.
When the power supplies are present but the channel is off, again
either the p-channel MOSFET or one of the n-channel MOSFETs
remains off when an overvoltage occurs.
Finally, when the power supplies are off, the gate of each MOSFET
is at ground. A negative overvoltage switches on the first n-channel
MOSFET, but the bias produced by the overvoltage causes the
p-channel MOSFET to remain turned off. With a positive over-
voltage, the first MOSFET in the series remains off because the
gate to source voltage applied to this MOSFET is negative.
During fault conditions (power supplies off), the leakage current
microamps. This limit protects the multiplexer and succeeding
circuitry from over stresses as well as protects the signal sources
that drive the multiplexer. Also, the other channels of the multi-
plexer are undisturbed by the overvoltage and continue to operate
normally.
Q1
Q2
Q3
+55V
OVERVOLTAGE
n-CHANNEL
MOSFET
SATURATES
VDD
VSS
004
68
-017
Figure 29. +55 V Overvoltage Input to the On Channel
Q1
Q2
Q3
–40V
OVERVOLTAGE
n-CHANNEL
MOSFET
IS ON
p-CHANNEL
MOSFET
SATURATES
VSS
VDD
0
04
68-
01
8
Figure 30. 40 V Overvoltage on an Off Channel with Multiplexer Power On
Q1
Q2
Q3
+55V
OVERVOLTAGE
n-CHANNEL
MOSFET IS
OFF
004
68
-01
9
Figure 31. +55 V Overvoltage with Power Off
Q1
Q2
Q3
–40V
OVERVOLTAGE
n-CHANNEL
MOSFET IS
ON
p-CHANNEL
MOSFET IS
OFF
0
046
8-
0
20
Figure 32. –40 V Overvoltage with Power Off
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| ADG438FBRZ | 制造商:Analog Devices 功能描述:IC, ANALOG MULTIPLEXER, 8 X 1, NSOIC-16 |
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