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參數(shù)資料
| 型號(hào)： | XTR101BG |
| 元件分類(lèi)： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | A/D Converter (A-D) IC; Resolution (Bits):20; Sample Rate:200SPS; Input Channels Per ADC:2; Input Channel Type:Differential; Data Interface:Serial; Package/Case:20-SOIC; Leaded Process Compatible:No; No. of Bits:20 RoHS Compliant: No |
| 中文描述： | 精密，低漂移的4 - 20mA二線制變送器 |
| 文件頁(yè)數(shù)： | 8/15頁(yè) |
| 文件大?。?/td> | 195K |
| 代理商： | XTR101BG |
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XTR101
8
8. Consider PC board layout which minimizes parasitic
capacitance, especially in high gain.
SELECTING R
S
R
SPAN
is chosen to that a given full scale input span e
INFS
will result in the desired full scale output span of
I
OFS
,
[(0.016 ) + (40/R
S
)]
e
IN
=
I
O
= 16mA.
Solving for R
S
:
40
I
O
/
e
IN
– 0.016
R
S
=
For example, if
e
INFS
= 100mV for
I
OFS
= 16mA,
R
S
=
=
=
= 278
See Typical Performance Curves for a plot of R
S
vs
e
INFS
.
Note that in order not to exceed the 20mA upper range limit,
e
IN
must be less than 1V when R
S
=
∞
and proportionately
smaller as R
S
decreases.
BIASING THE INPUTS
Because the XTR operates from a single supply both e
1
and
e
2
must be biased approximately 5V above the voltage at pin
7 to assure linear response. This is easily done by using one
or both current sources and an external resistor R
2
. Figure 5
shows the simplest case— a floating voltage source e'
2
. The
2mA from the current sources flows through the 2.5k
value of R
2
and both e
1
and e
2
are raised by the required 5V
with respect to pin 7. For linear operation the constraint is
+4V
≤
e
1
≤
+6V
+4V
≤
e
2
≤
+6V
The offset adjustment is used to remove the offset voltage of
the input amplifier. When the input differential voltage (e
IN
)
equals zero, adjust for 4mA output.
Figure 6 shows a similar connection for a resistive trans-
ducer. The transducer could be excited either by one (as
shown) or both current sources. Also, the offset adjustment
has higher resolution compared to Figure 5.
CMV AND CMR
The XTR101 is designed to operate with a nominal 5V
common-mode voltage at the input and will function prop-
erly with either input operating over the range of 4V to 6V
with respect to pin 7. The error caused by the 5V CMV is
already included in the accuracy specifications.
If the inputs are biased at some other CMV then an input
offset error term is (CMV – 5)/CMRR; CMR is in dB,
CMRR is in V/V.
SIGNAL SUPPRESSION AND ELEVATION
In some applications it is desired to have suppressed zero
range (input signal elevation) or elevated zero range (input
signal suppression). This is easily accomplished with the
XTR101 by using the current sources to create the suppres-
sion/elevation voltage. The basic concept is shown in Fig-
ures 7 and 8(a). In this example the sensor voltage is derived
from R
T
(a thermistor, RTD, or other variable resistance
element) excited by one of the 1mA current sources. The
other current source is used to create the elevated zero range
voltage. Figures 8(b), (c) and (d) show some of the possible
circuit variations. These circuits have the desirable feature
of noninteractive span and suppression/elevation adjust-
ments. Note: It is not recommended to use the optional offset
voltage null (pins 1, 2 and 14) for elevation/suppression.
This trim capability is used only to null the amplifier’s input
offset voltage. In many applications the already low offset
voltage (typically 20
μ
V) will not need to be nulled at all.
Adjusting the offset voltage to nonzero values will disturb
the voltage drift by
±
0.3
μ
V/
°
C per 100
μ
V or induced offset.
16mA/100mV) – 0.016
40
0.144
40
0.16 – 0.016
40
(1)
FIGURE 5. Basic Connection for Floating Voltage Source.
FIGURE 6. Basic Connection for Resistive Source.
+
–
8
10
11
3
5
6
4
R
S
Adj.
e
IN
+
–
XTR101
R
2
2.5k
7
2mA
0.01μF
0.01μF
D
1
I
O
2
1
4-20 mA
e
1
e
2
R
L
Offset
Adjust
1M
e'
2
2mA
+5V
I
O
= 4mA + (0.016 + R
IN
S
40
e
IN
= e
2
+
14
e
L
+
24V
–
–
+
–
+
8
10
3
5
6
4
R
S
e
IN
+
–
XTR101
R
2
2.5k
7
1mA
0.01μF
D
1
2
1
e
1
e
2
Offset
Adjust
100k
e
2
2mA
+5V
I
O
= 4mA + (0.016 + R
IN
S
40
e
IN
= e'
2
= 1mA
X
R
T
+
0.01μF
1mA
–
R
T
1M
11
Alternate circuitry
shown in Figure 8.
14
+
24V
–
–
+
R
L
e
L
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| XTR110BG | PRECISION VOLTAGE-TO-CURRENT CONVERTER/TRANSMITTER |
| XTR110KP | PRECISION VOLTAGE-TO-CURRENT CONVERTER/TRANSMITTER |
| XTR110KU | PRECISION VOLTAGE-TO-CURRENT CONVERTER/TRANSMITTER |
| XTR110 | A/D Converter (A-D) IC; Resolution (Bits):24; Sample Rate:606SPS; Input Channels Per ADC:2; Input Channel Type:Differential; Data Interface:Serial, 3-Wire; Package/Case:20-DIP; Interface Type:Serial; Leaded Process Compatible:No RoHS Compliant: No |
| XTR110AG | PRECISION VOLTAGE-TO-CURRENT CONVERTER/TRANSMITTER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XTR101L | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:LCC Precision Low Drift 4MA to 20MA Two-Wire Transmitter |
| XTR103 | 制造商:BB 制造商全稱(chēng):BB 功能描述:4-20mA Current Transmitter with RTD EXCITATION AND LINEARIZATION |
| XTR103AP | 功能描述:電流靈敏放大器 4-20mA w/RTD 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 |
| XTR103AU | 功能描述:電流靈敏放大器 4-20mA w/RTD 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 |
| XTR103BP | 制造商:BB 制造商全稱(chēng):BB 功能描述:4-20mA Current Transmitter with RTD EXCITATION AND LINEARIZATION |
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