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參數(shù)資料
| 型號(hào)： | MAX355 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | MuxIt (TM) Serializer-Transmitter 32-TSSOP -40 to 85 |
| 中文描述： | 故障保護(hù)模擬多路復(fù)用器 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 130K |
| 代理商： | MAX355 |
M
Fault-Protec ted Analog Multiplexers
8
_______________________________________________________________________________________
_________________________________Test Circ uits/T iming Diagrams (c ontinued)
+15V
V
OUT
-15V
GND
V+
A1
V-
A0
A2
NO8
COM
MAX354
NO1
R
S
= 50
V
IN
EN
10nF
R
L
1k
OFF ISOLATION = 20log
V
OUT
V
IN
10nF
+15V
V
OUT
-15V
GND
V+
A1
V-
A0
A2
NO8
COM
MAX354
NO2
R
G
= 50
V
IN
EN
10nF
R
L
1k
CROSSTALK = 20log
V
OUT
V
IN
10nF
NO1
R = 1k
+15V
-15V
GND
V+
A2
V-
A1
A0
NO8
MAX354
CHANNEL
SELECT
NO1
COM
EN
1MHz
CAPACITANCE
ANALYZER
f = 1MHz
Figure 5. Off Isolation
Figure 6. Crosstalk
Figure 7. NO/COM Capacitance
_______________Detailed Desc ription
Fault-Protec tion Circ uitry
Maxim’s MAX354/MAX355 are fully fault protected for
continuous input voltages up to ±40V, whether or not
the V+ and V- power supplies are present. These
devices use a “series FET” protection scheme that not
only protects the multiplexer output from overvoltage,
but also limits the input current to sub-microamp levels.
When signal voltages exceed or are within approxi-
mately 1.5V of the supply rails, on-resistance increas-
es. This greater on-resistance limits fault currents and
output voltage, protecting sensitive circuits and com-
ponents. The protected output clamps at approximately
1.5V below the supply rails and maintains the correct
polarity. There are no glitches or polarity reversals
going into or coming out of a fault condition.
Figures 8 and 9 show how the series FET circuit protects
against overvoltage conditions. When power is off, the
gates of all three FETs are at ground. With a -25V input,
N-channel FET Q1 is turned on by the +25V gate-to-
source voltage. The P-channel device (Q2), however,
has +25V V
GS
and is turned off, thereby preventing the
input signal from reaching the output. If the input volt-
age is +25V, Q1 has a negative V
GS
, which turns it off.
Similarly, only sub-microamp leakage currents can flow
from the output back to the input, since any voltage will
turn off either Q1 or Q2.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX355CPE | MuxIt (TM) Serializer-Transmitter 32-TSSOP -40 to 85 |
| MAX355EPE | MuxIt (TM) Receiver-Deserializer 32-TSSOP -40 to 85 |
| MAX355MJE | Fault-Protected Analog Multiplexers |
| MAX354MJE | Fault-Protected Analog Multiplexers |
| MAX354CWE | Fault-Protected Analog Multiplexers |
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