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參數(shù)資料
| 型號(hào)： | XTR101 |
| 英文描述： | A/D Converter (A-D) IC; Resolution (Bits):16; Sample Rate:4kSPS; Input Channels Per ADC:1; Data Interface:Serial; Package/Case:20-SOIC; DNL +/-:0.5LSB; Interface Type:Serial; Leaded Process Compatible:No; No. of Bits:16 RoHS Compliant: Yes |
| 中文描述： | 精密，低漂移的4 - 20mA二線制變送器 |
| 文件頁數(shù)： | 10/15頁 |
| 文件大?。?/td> | 195K |
| 代理商： | XTR101 |
XTR101
10
FIGURE 10. Thermocouple Input Circuit with Two
Temperature Regions and Diode (D) Cold
Junction Compensation.
FIGURE 9. Circuit for Example 1.
EXAMPLE 2
Thermocouple Transducer shown in Figure 10.
Given a process with temperature (T
1
) limits of 0
°
C and
+1000
°
C, configure the XTR101 to measure the temperature
with a type J thermocouple that produces a 58mV change for
1000
°
C change. Use a semiconductor diode for a cold
junction compensation to make the measurement relative to
0
°
C. This is accomplished by supplying a compensating
voltage, V
R6
, equal to that normally produced by the thermo-
couple with its “cold junction” (T
2
) at ambient. At a typical
ambient of +25
°
C this is 1.28mV (obtained from standard
thermocouple tables with reference junction of 0
°
C). Trans-
mit 4mA for T
1
= 0
°
C and 20mA for T
1
= +1000
°
C. Note:
e
IN
= e
2
– e
1
indicates that T
1
is relative to T
2
.
ESTABLISHING R
S
:
The input full scale span is 58mV (
e
INFS
= 58mV).
R
S
is found from equation (1)
R
S
=
=
16mA/58mV – 0.016
SELECTING R
4
:
R
4
is chosen to make the output 4mA at T
TC
= 0
°
C (V
TC
=
–1.28mV) and T
D
= +25
°
C (V
D
= 0.6V). A circuit is shown
in Figure 10.
V
TC
will be –1.28mV when T
TC
= 0
°
C and the reference
junction is at +25
°
C. e
1
must be computed for the condition
of T
D
= +25
°
C to make e
IN
= 0V.
V
D 25
°
C
= 600mV
e
1 25
°
C
= 600mV (51/2051) = 14.9mV
e
IN
= e
2
– e
1
= V
TC
+ V
4
– e
1
40
40
I
O
/
e
IN
– 0.016
0.2599
KT
R
5
+ R
6
R
6
(2)
With e
IN
= 0 and V
TC
= –1.28mV,
V
4
= e
1
+ e
IN
– V
TC
= 14.9mV + 0V – (–1.28mV)
1mA (R
4
) = 16.18mV
R
4
= 16.18
COLD JUNCTION COMPENSATION:
The temperature reference circuit is shown in Figure 11.
The diode voltage has the form
V
D
= q
Typically at T
2
= +25
°
C, V
D
= 0.6V and
V
D
/
T =
–2mV/
°
C. R
5
and R
6
form a voltage divider for the diode
voltage V
D
. The divider values are selected so that the
gradient
V
D/
T equals the gradient of the thermocouple at
the reference temperature. At +25
°
C this is approximately
52
μ
V/
°
C (obtained from standard thermocouple table);
therefore,
T
C
/
T =
V
D/
T
52
μ
V/
°
C = 2000
μ
V/
°
C
R
5
is chosen as 2k
to be much larger than the resistance of
the diode. Solving for R
6
yields 51
.
THERMOCOUPLE BURN-OUT INDICATION
In process control applications it is desirable to detect when
a thermocouple has burned out. This is typically done by
forcing the two-wire transmitter current to either limit when
I
DIODE
I
SAT
+
–
XTR101
1mA
1mA
R
6
51
–
+
2.5k
e
1
e
2
–
3
11
10
8
7
4
R
4
V
4
0.01μF
V
TC
Thermocouple
T
TC
Temperature T
1
Temperature T
2
= T
D
+
+
–
D
R
5
2k
e
IN
+
–
8
10
3
5
6
4
R
S
e
IN
+
–
XTR101
R
2
7
0.01μF
D
1
e
1
e
2
e'
2
+
0.01μF
–
R
T
11
V
4
R
4
+
–
+
24V
–
–
+
R
L
e
L
R
5
+ R
6
R
6
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| XTR101AG | A/D Converter (A-D) IC; Resolution (Bits):20; Sample Rate:4kSPS; Input Channels Per ADC:1; Data Interface:Serial; Package/Case:20-DIP; Interface Type:Serial; Leaded Process Compatible:No; No. of Bits:20 RoHS Compliant: No |
| XTR101AP | A/D Converter (A-D) IC; Resolution (Bits):20; Sample Rate:4000SPS; Input Channels Per ADC:1; Data Interface:Serial; Package/Case:20-SOIC; DNL +/-:0.5LSB; Interface Type:Serial; Leaded Process Compatible:No; No. of Bits:20 RoHS Compliant: Yes |
| XTR101AU | 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-DIP; Leaded Process Compatible:No; No. of Bits:20; No. of Channels:2 RoHS Compliant: No |
| XTR101BG | 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 |
| XTR110BG | PRECISION VOLTAGE-TO-CURRENT CONVERTER/TRANSMITTER |
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| XTR101AG | 功能描述:電流靈敏放大器 Prec Lo-Drift 4-20mA 2-Wire Trnsmtr 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 |
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| XTR101AP | 功能描述:電流靈敏放大器 Prec Lo-Drift 4-20mA 2-Wire Trnsmtr 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 |
| XTR101AP | 制造商:BURR-BROWN 功能描述:PRECISION TRANSMITTER DIP14 101 制造商:Texas Instruments 功能描述:PRECISION TRANSMITTER DIP14 101 制造商:Texas Instruments 功能描述:PRECISION TRANSMITTER, DIP14, 101 制造商:Texas Instruments 功能描述:PRECISION TRANSMITTER, DIP14, 101; Supply Voltage Min:11.6V; Supply Voltage Max:40V; No. of Pins:14; Operating Temperature Min:-40C; Operating Temperature Max:85C; SVHC:No SVHC (19-Dec-2012); Accuracy:5%; Amplifier Case Style:DIP; ;RoHS Compliant: Yes |
| XTR101AP | 制造商:Texas Instruments 功能描述:Transceiver IC |
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