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參數(shù)資料
| 型號： | ADG439FBR |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | High Performance 4/8 Channel Fault-Protected Analog Multiplexers |
| 中文描述： | 4-CHANNEL, DIFFERENTIAL MULTIPLEXER, PDSO16 |
| 封裝： | 0.150 INCH, SOIC-16 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大小： | 127K |
| 代理商： | ADG439FBR |
ADG438F/ADG439F
–6–
REV. D
n-channel threshold voltage (V
TN
). When a voltage more nega-
tive than V
SS
is applied to the multiplexer, the p-channel
MOSFET will turn off since the analog input is more negative
than the difference between V
SS
and the p-channel threshold
voltage (V
TP
).
When the power supplies are present but the channel is off,
again either the p-channel MOSFET or one of the n-channel
MOSFETs will remain off when an overvoltage occurs.
Finally, when the power supplies are off, the gate of each
MOSFET will be 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 overvoltage, the first MOSFET in the series
will remain off since the gate to source voltage applied to this
MOSFET is negative.
During fault conditions, the leakage current into and out of the
ADG438F/ADG439F is limited to a few microamps. This pro-
tects the multiplexer and succeeding circuitry from over stresses
as well as protecting the signal sources which drive the multi-
plexer. Also, the other channels of the multiplexer will be
undisturbed by the overvoltage and will continue to operate
normally.
Q1
Q2
Q3
+55V
OVERVOLTAGE
n-CHANNEL
MOSFET IS
OFF
Figure 12. +55 V Overvoltage with Power OFF
Q1
Q2
Q3
–40V
OVERVOLTAGE
n-CHANNEL
MOSFET IS
ON
p-CHANNEL
MOSFET IS
OFF
Figure 13. –40 V Overvoltage with Power OFF
THEORY OF OPERATION
The ADG438F/ADG439F multiplexers are capable of with-
standing 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 will switch off, limiting the current to sub-microamp
levels, thereby preventing the overvoltage from damaging any
circuitry following the multiplexer. Figure 12 illustrates the
channel architecture that enables these multiplexers to with-
stand continuous overvoltages.
When an analog input of V
SS
+ 1.2 V to V
DD
– 0.8 V is applied
to the ADG438F/ADG439F, the multiplexer behaves as a
standard multiplexer, with specifications similar to a standard
multiplexer, for example, the on-resistance is 180
typically.
However, when an overvoltage is applied to the device, one of
the three MOSFETs will turn off.
Figures 10 to 13 show the conditions of the three MOSFETs for
the various overvoltage situations. When the analog input ap-
plied to an ON channel approaches the positive power supply
line, the n-channel MOSFET turns OFF since the voltage on
the analog input exceeds the difference between V
DD
and the
Q1
Q2
Q3
+55V
OVERVOLTAGE
n-CHANNEL
MOSFET IS
OFF
V
DD
V
SS
Figure 10. +55 V Overvoltage Input to the ON Channel
Q1
Q2
Q3
–40V
OVERVOLTAGE
n-CHANNEL
MOSFET IS
ON
V
DD
V
SS
p-CHANNEL
MOSFET IS
OFF
Figure 11. –40 V Overvoltage on an OFF Channel with
Multiplexer Power ON
Test Circuits
I
DS
S
R
ON
= V
1
/I
DS
V1
V
S
D
Test Circuit 1. On Resistance
V
D
S1
S2
S8
V
S
V
SS
V
DD
I
D
(OFF)
V
SS
V
DD
+0.8V
D
EN
A
Test Circuit 3. I
D
(OFF)
V
S
I
S
(OFF)
V
D
S1
S2
S8
V
SS
V
DD
V
SS
V
DD
+0.8V
D
EN
A
Test Circuit 2. I
S
(OFF)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADG438 | High Performance 4/8 Channel Fault-Protected Analog Multiplexers |
| ADG438F | High Performance 4/8 Channel Fault-Protected Analog Multiplexers |
| ADG438FBN | High Performance 4/8 Channel Fault-Protected Analog Multiplexers |
| ADG438FBR | High Performance 4/8 Channel Fault-Protected Analog Multiplexers |
| ADG439F | High Performance 4/8 Channel Fault-Protected Analog Multiplexers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADG439FBRN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Channel Analog Multiplexer |
| ADG439FBR-REEL | 制造商:Analog Devices 功能描述:Analog Multiplexer Dual 4:1 16-Pin SOIC N T/R |
| ADG439FBRW | 制造商:Analog Devices 功能描述:Analog Multiplexer Dual 4:1 16-Pin SOIC W Tube 制造商:Rochester Electronics LLC 功能描述:FAULT PROTECTED MULTIPLEXER I.C. - Bulk |
| ADG439FBRW-REEL | 制造商:Analog Devices 功能描述:Analog Multiplexer Dual 4:1 16-Pin SOIC W T/R 制造商:Analog Devices 功能描述:ANLG MUX DUAL 4:1 25V/25V 16SOIC W - Tape and Reel |
| ADG439FBRWZ | 功能描述:IC MULTIPLEXER DUAL 4X1 16SOIC 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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