參數(shù)資料
型號(hào)： MAX379CPE
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 多路復(fù)用及模擬開關(guān)
英文描述： High-Voltage, Fault-Protected Analog Multiplexers
中文描述： 4-CHANNEL, DIFFERENTIAL MULTIPLEXER, PDIP16
封裝： 0.300 INCH, PLASTIC, DIP-16
文件頁(yè)數(shù)： 11/14頁(yè)
文件大?。?/td> 182K
代理商： MAX379CPE
MAX378/MAX379
High-Voltage, Fault-Protected
Analog Multiplexers
6
_______________________________________________________________________________________
_______________Typical Applications
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 (RDS(ON)) times the multi-
plexer leakage current (IOUT(ON)) and the amplifier
bias current (IBIAS):
VERR = RDS(ON) x (IOUT(ON) + IBIAS (MAX420))
= 2.0k
x (2nA + 30pA)
= 18.0V 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 40V/°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 5V 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
1
X
0
1
0
1
X
0
1
0
1
0
1
0
1
0
1
NONE
1
2
3
4
5
6
7
8
Truth Table—MAX379
A1
A0
EN
ON
SWITCH
X
0
1
X
0
1
0
1
0
1
NONE
1
2
3
4
Note: Logic “0” = VAL
≤ 0.8V, Logic “1” = VAH ≥ 2.4V
MAX420
+15V
-15V
V+
+15V
1M
100k
10k
OUT
1k
111
IN1
IN2
IN3
IN4
IN5
V+
THERMOCOUPLE
+15V
-15V
V-
GND
DG508A
MAX358
OR
MAX378
IN2
STRAIN GUAGE
IN7
+10V
GAIN REFERENCE
IN8
ZERO REFERENCE
IN3
4-20mA LOOP
TRANSMITTER
IN4
IN5
IN6
-15V
V-
GND
Figure 6. Typical Data Acquisition Front End
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX379CPE+ 功能描述:多路器開關(guān) IC 4:1 2Ch Fault-Prtct Analog MUX RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關(guān)數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 傳播延遲時(shí)間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UQFN-16
MAX379CWG 功能描述:多路器開關(guān) IC RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關(guān)數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 傳播延遲時(shí)間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UQFN-16
MAX379CWG+ 功能描述:多路器開關(guān) IC 4:1 2Ch Fault-Prtct Analog MUX RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關(guān)數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 傳播延遲時(shí)間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UQFN-16
MAX379CWG+T 功能描述:多路器開關(guān) IC 4:1 2Ch Fault-Prtct Analog MUX RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關(guān)數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 傳播延遲時(shí)間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UQFN-16
MAX379CWG-T 功能描述:多路器開關(guān) IC RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關(guān)數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 傳播延遲時(shí)間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UQFN-16
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