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參數(shù)資料
| 型號(hào)： | XTR104BU |
| 英文描述： | 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 |
| 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(yè)數(shù)： | 9/11頁(yè) |
| 文件大?。?/td> | 165K |
| 代理商： | XTR104BU |
9
XTR104
Then, R
LIN
can be calculated using equation 5 using the
accurate value of K
LIN
from equation 7. K
LIN
can be a
different value for each XTR104.
It is also possible to make a real-time adjustment of R
LIN
with a variable resistor (active circuit trimming). This is
done by measuring the change in V
R
in response to a zero-
to-V
FS
change in voltage applied to the V
LIN
inputs. To
correct for each 1% of nonlinearity, the excitation voltage,
V
R
, must make a 4% change at full-scale input. So the
change in reference voltage,
V
R
, for a full-scale change in
V
LIN
can be calculated by:
V
R
= 0.2 B
(8)
Example:
A bridge sensor has a –1.9% nonlinearity. Apply
the full-scale bride output, V
FS
(10mV), to the V
LIN
inputs
and adjust R
LIN
for:
V
R
'
’
= 5V + 0.2 B = 4.62V
Note that with all the calculation and adjustment methods
described above, the full-scale bridge output is no longer
equal to V
FS
because the excitation voltage at full scale is no
longer 5V. All the calculations and adjustment procedures
described above assume V
FS
to be the full-scale bridge
output with constant 5V excitation. It is not necessary to
iterate the calculations or adjustment procedures using the
new full-scale bridge output as a starting point. However, a
new value for R
G
must be calculated using equation 6.
A refined value for R
LIN
, arrived at either by active circuit
trimming, or by measuring linearization gain (equation 7)
will improve linearity. Reduction of the original parabolic
nonlinearity of the sensor can approach 40:1. Actual results
will depend on higher-order nonlinearity of the sensor.
If no linearity correction is desired, make no connections to
the R
LIN
pins (R
LIN
=
∞
). This will cause the V
R
output to
remain a constant +5V. The V
+LIN
and V
–LIN
inputs should
remain connected to the bridge output to keep these inputs
biased in their active region.
OTHER SENSOR TYPES
The XTR104 can be used with a wide variety of inputs. Its
high input impedance instrumentation amplifier is versatile
and can be configured for differential input voltages from
millivolts to a maximum of 1V full scale. The linear com-
mon-mode range of the inputs is from 2V to 4V, referenced
to the I
O
terminal, pin 7.
You can use the linearization feature of the XTR104 with
any sensor whose output is ratiometric with an excitation
voltage. For example, Figure 5 shows the XTR104 used with
a potentiometer position sensor.
REVERSE-VOLTAGE PROTECTION
Figure 6 shows two ways to protect against reversed output
connection lines. Trade-offs in an application will determine
which technique is better. D
1
offers series protection, but
causes a 0.7V loss in loop supply voltage. This may be
undesirable if V+ can approach the 9V limit. Using D
2
(without D
1
) has no voltage loss, but high current will flow
in the loop supply if the leads are reversed. This could
damage the power supply or the sense resistor, R
L
. A diode
with a higher current rating is needed for D
2
to withstand the
highest current that could occur with reversed lines.
SURGE PROTECTION
Long lines may be subject to voltage surges which can
damage semiconductor components. To avoid damage, the
maximum applied voltage rating for the XTR104 is 40V. A
zener diode can be used for D
2
(Figure 7) to clamp the
voltage applied to the XTR104 to a safe level. The loop
power supply voltage must be lower than the voltage rating
of the zener diode.
There are special zener diode types (Figure 7) specifically
designed to provide a very low impedance clamp and with-
stand large energy surges. These devices normally have a
diode characteristic in the forward direction which also
FIGURE 5. Potentiometer Sensor Application.
8
R
LIN
12
1
5
6
2
R
G
XTR104
8k
10k
7
R
G
R
G
V
–
IN
V
+
IN
V
R
V
+
I
O
E
B
R
L
–
V
PS
–
+
11
4-20 mA
0.01μF
+
13
10
4
V
–
LIN
3
V
+
LIN
9
R
LIN
10k
2k
10k
2.5k
5V
2.5V
2.5V
to
3V
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 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 |
| XTR106PA | A/D Converter (A-D) IC; Resolution (Bits):20; Sample Rate:100SPS; Input Channels Per ADC:1; Input Channel Type:Differential; Data Interface:Serial; Package/Case:8-SOIC; Interface Type:Serial; Leaded Process Compatible:No RoHS Compliant: Yes |
| XTR106U | A/D Converter (A-D) IC; Resolution (Bits):16; Sample Rate:60SPS; Input Channels Per ADC:1; Input Channel Type:Differential; Data Interface:Serial, 3/4/5-Wire; Package/Case:; DNL +/-:0.5LSB; Interface Type:Serial RoHS Compliant: No |
| XTR106UA | A/D Converter (A-D) IC; Resolution (Bits):16; ADC Sample Rate:60SPS; Input Channels Per ADC:1; Input Channel Type:Differential Inputs; DNL +/-:0.5LSB; Data Interface:Serial, 3/4/5-Wire; Package/Case:24-SOIC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)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 |
| XTR105P | 功能描述:電流靈敏放大器 4-20mA Crnt Trnsmtr w/Sensor Exc & Lin RoHS:否 制造商:Texas Instruments 通道數(shù)量: 共模抑制比（最小值）:110 dB 輸入補(bǔ)償電壓:80 uV 電源電壓-最大:5.5 V 電源電壓-最小:2.7 V 電源電流:350 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel |
| XTR105PA | 功能描述:電流靈敏放大器 4-20mA Crnt Trnsmtr w/Sensor Exc & Lin RoHS:否 制造商:Texas Instruments 通道數(shù)量: 共模抑制比（最小值）:110 dB 輸入補(bǔ)償電壓:80 uV 電源電壓-最大:5.5 V 電源電壓-最小:2.7 V 電源電流:350 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel |
| XTR105PA | 制造商:BURR-BROWN 功能描述:IC CURRENT TRANSMITTER DIP14 105 |
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