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參數(shù)資料
| 型號(hào)： | XTR104AP |
| 英文描述： | 4-20mA Current Transmitter with BRIDGE EXCITATION AND LINEARIZATION |
| 中文描述： | 4 - 20mA電流變送器的電橋的激勵(lì)和線性化 |
| 文件頁數(shù)： | 10/11頁 |
| 文件大?。?/td> | 165K |
| 代理商： | XTR104AP |
10
XTR104
protects against reversed loop connections. As noted earlier,
reversed loop connections would produce a large loop cur-
rent, possibly damaging R
L
.
RADIO FREQUENCY INTERFERENCE
The long wire lengths of current loops invite radio frequency
interference. RF can be rectified by the sensitive input
circuitry of the XTR104 causing errors. This generally
appears as an unstable output current that varies with the
position of loop supply or input wiring.
If the bridge sensor is remotely located from the XTR104,
the interference may enter at the input terminals. For inte-
grated transmitter assemblies with short connections to the
sensor, the interference more likely comes from the current
loop connections.
Bypass capacitors on the input often reduce or eliminate this
interference. Connect these bypass capacitors to the I
O
terminal (see Figure 7). Although the DC voltage at the I
O
terminal is not equal to 0V (at the loop supply, V
PS
) this
circuit point can be considered the transmitter’s “ground”.
LOW-IMPEDANCE BRIDGES
Low impedance bridges can be used with the XTR104 by
adding series resistance to limit excitation current to
≤
2mA.
Equal resistance should be added to the upper and lower
sides of the of the bridge (Figure 8) to keep the bridge output
voltage centered at approximately 2.5V. Bridge output is
reduced, so a preamplifier, as shown, may be needed to
reduce offset and drift.
FIGURE 6. Reverse Voltage Protection.
7
V
PS
1N4148
D
1
10
0.01μF
R
L
D
1N4001
13
11
Use either D
or D
.
See “Reverse Voltage Protection.”
XTR104
V+
I
O
E
B
FIGURE 7. Over-Voltage Surge Protection.
XTR104
R
G
–
+
R
L
–
V
PS
–
+
11
0.01μF
+
13
7
4
6
5
1
12
10
2
R
B
3
R
LIN
8
9
V
+
LIN
R
G
V
–
LIN
V
+
IN
R
G
V
–
IN
I
O
E
B
V+
R
LIN
Bridge
Sensor
V
R
I
O
= 4-20mA
4-20mA
Q
1
0.01μF
0.01μF
Maximum V
must be less than
minimum voltage rating of zener diode.
Zener diode 36V: 1N4753A
or
General Semiconductor Transorb 1N6286A, special
low impedence clamp type. Use lower voltage zener
diodes with loop power supply voltages less than 30V
for increased protection.
D
2
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| XTR104AU | A/D Converter (A-D) IC; Resolution (Bits):16; Sample Rate:100SPS; Input Channels Per ADC:1; Input Channel Type:Differential; Data Interface:Serial; Package/Case:20-DIP; DNL +/-:0.5LSB; Leaded Process Compatible:No; No. of Bits:16 RoHS Compliant: No |
| XTR104BP | 4-20mA Current Transmitter with BRIDGE EXCITATION AND LINEARIZATION |
| XTR104BU | A/D Converter (A-D) IC; Resolution (Bits):16; Sample Rate:100SPS; Input Channels Per ADC:1; Input Channel Type:Differential; Data Interface:Serial; Package/Case:20-SOIC; DNL +/-:0.5LSB; Leaded Process Compatible:No; No. of Bits:16 RoHS Compliant: No |
| XTR106 | A/D Converter (A-D) IC; Resolution (Bits):16; Sample Rate:212SPS; Input Channels Per ADC:1; Input Channel Type:Differential; Data Interface:Serial; Package/Case:8-SOIC; Leaded Process Compatible:No; No. of Bits:18 RoHS Compliant: Yes |
| XTR106P | A/D Converter (A-D) IC; Resolution (Bits):16; Sample Rate:100SPS; Input Channels Per ADC:1; Input Channel Type:Differential; Data Interface:Serial; Package/Case:8-SOIC; Leaded Process Compatible:No; No. of Bits:18 RoHS Compliant: Yes |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XTR104AU | 制造商:Rochester Electronics LLC 功能描述:4-20 MA XMITTER - Bulk |
| XTR104BP | 制造商:Texas Instruments 功能描述:IC 4-20 MA I-TRANSMITTER 16-DIP |
| XTR104BU | 制造商:Texas Instruments 功能描述: |
| XTR105 | 制造商:BB 制造商全稱:BB 功能描述:4-20mA CURRENT TRANSMITTER with Sensor Excitation and Linearization |
| XTR105-DIE | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4-20mA CURRENT TRANSMITTER WITH SENSOR EXCITATION AND LINEARIZATION |
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