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參數資料
| 型號： | XTR103BU |
| 英文描述： | 4-20mA Current Transmitter with RTD EXCITATION AND LINEARIZATION |
| 中文描述： | 4 - 20mA電流變送器的RTD激勵和線性化 |
| 文件頁數： | 8/10頁 |
| 文件大?。?/td> | 222K |
| 代理商： | XTR103BU |
8
XTR103
2
16
XTR103
1
10k
XTR103
5k
5k
1
(a)
(b)
2
16
±500μA typical
output current
adjustment range.
±50μA typical
output current
adjustment range.
FIGURE 3. Low-Scale Output Current Adjustment.
with R
G
. If the input stage is set for high gain (as required
with narrow temperature measurement spans) the output
current adjustment may not provide sufficient range. In these
cases, offset can be nulled by adjusting the value of R
Z
.
TWO-WIRE AND
THREE-WIRE RTD CONNECTIONS
In Figure 1, the RTD can be located remotely simply by
extending the two connections to the RTD. With this two-
wire connection to the RTD, line resistance will introduce
error. This error can be partially corrected by adjusting the
values of R
Z
,
R
G
, and R
LIN
.
Figure 4, shows a three-wire RTD connection for improved
accuracy with remotely located RTDs. R
Z
’s current is routed
through a third wire to the RTD. Assuming line resistance is
equal in RTD lines 1 and 2, this produces a small common-
mode voltage which is rejected by the XTR103.
OPEN-CIRCUIT DETECTION
The optional transistor Q
2
in Figure 4 provides predictable
behavior with open-circuit RTD connections. It assures that
if any one of the three RTD connections is broken, the
XTR103’s output current will go to either its high current
limit (
≈
34mA) or low current limit (
≈
3.6mA). This is easily
detected as an out-of-range condition.
REVERSE-VOLTAGE PROTECTION
Figure 5 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 are subject to voltage surges which can damage
semiconductor components. To avoid damage, the maxi-
mum applied voltage rating for the XTR103 is 40V. A zener
diode may be used for D
2
(Figure 6) to clamp the voltage
applied to the XTR103 to a safe level. The loop power
supply voltage must be lower than the voltage rating of the
zener diode.
FIGURE 4. Three-Wire Connection for Remotely Located RTDs.
12
13
4
5
6
3
R
G
XTR103
7
9
8
R
G
R
G
V
–
IN
V
+
IN
I
R
I
R
V+
10
Q
1
RTD
R
CM
R
LIN
Q
2
*
R
Z
(R
LINE
)
1
2
3
Resistance in this line causes
a small common-mode voltage
which is rejected by XTR103.
a small common-mode voltage
which is rejected by XTR103.
*Q
optional. Provides
predictable output
current if any one
RTD connection
is broken:
Open RTD
Terminal
I
O
1
2
3
≈
34mA
≈
3.6mA
≈
3.6mA
line resistances here creates
11
0.01μF
0.01μF
1.5k
2N2222
相關PDF資料 |
PDF描述 |
|---|---|
| XTR104 | A/D Converter (A-D) IC; Resolution (Bits):20; Sample Rate:100SPS; Input Channels Per ADC:4; Input Channel Type:Differential; Data Interface:Serial; Package/Case:24-SOIC; Leaded Process Compatible:No; No. of Bits:20 RoHS Compliant: Yes |
| XTR104AP | 4-20mA Current Transmitter with BRIDGE EXCITATION AND LINEARIZATION |
| 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 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| XTR104 | 制造商:BB 制造商全稱:BB 功能描述:4-20mA Current Transmitter with BRIDGE EXCITATION AND LINEARIZATION |
| XTR104AP | 制造商:BB 制造商全稱:BB 功能描述:4-20mA Current Transmitter with BRIDGE EXCITATION AND LINEARIZATION |
| 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: |
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