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參數(shù)資料
| 型號： | MAX378 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | High-Voltage, Fault-Protected Analog Multiplexers(高壓、故障保護(hù)模擬多路轉(zhuǎn)換器) |
| 中文描述： | 8通道、高電壓、故障保護(hù)多路復(fù)用器 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 142K |
| 代理商： | MAX378 |
M
High-Voltage, Fault-Protec ted
Analog Multiplexers
6
_______________________________________________________________________________________
_______________Typic al Applic ations
Figure 6 shows a typical data acquisition system
using the MAX378 multiplexer. Since the multiplexer
is driving a high-impedance input, its error is a func-
tion of its own resistance (R
DS(ON)
) times the multi-
plexer leakage current (I
OUT(ON)
) and the amplifier
bias current (I
BIAS
):
V
ERR
= R
DS(ON)
x (I
OUT(ON)
+ I
BIAS
(MAX420))
= 2.0k
x (2nA + 30pA)
= 18.0μV maximum error
In most cases, this error is low enough that preamplifi-
cation of input signals is not needed, even with very
low-level signals such as 40μV/°C from type J thermo-
couples.
In systems with fewer than eight inputs, an unused chan-
nel can be connected to the system ground reference
point for software zero correction. A second channel
connected to the system voltage reference allows gain
correction of the entire data acquisition system as well.
A MAX420 precision op amp is connected as a pro-
grammable-gain amplifier, with gains ranging from 1 to
10,000. The guaranteed 5μV unadjusted offset of the
MAX420 maintains high signal accuracy, while program-
mable gain allows the output signal level to be scaled to
the optimum range for the remainder of the data acqui-
sition system, normally a Sample/Hold and A/D. Since
the gain-changing multiplexer is not connected to the
external sensors, it can be either a DG508A multiplexer
or the fault-protected MAX358 or MAX378.
Truth Table—MAX378
A2
A1
A0
EN
ON
SWITCH
X
0
0
0
0
1
1
1
1
X
0
0
1
1
0
0
1
1
X
0
1
0
1
0
1
0
1
0
1
1
1
1
1
1
1
1
NONE
1
2
3
4
5
6
7
8
Truth Table—MAX379
A1
A0
EN
ON
SWITCH
X
0
0
1
1
X
0
1
0
1
0
1
1
1
1
NONE
1
2
3
4
Note:
Logic “0” = V
AL
≤
0.8V, Logic “1” = V
AH
≥
2.4V
MAX420
+15V
-15V
V+
+15V
1M
100k
10k
OUT
OUT
1k
111
IN1
IN1
IN2
IN3
IN4
IN5
V+
THERMOCOUPLE
+15V
-15V
V-
GND
DG508A
MAX358
OR
MAX378
MAX378
IN2
STRAIN GUAGE
IN7
+10V
GAIN REFERENCE
IN8
ZEROREFERENCE
IN3
4-20mA LOOP
TRANSMITTER
IN4
IN5
IN6
-15V
V-
GND
Figure 6. Typical Data Acquisition Front End
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