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AD7193 데이터시트(PDF) 4 Page - Analog Devices

부품명 AD7193
상세설명  Devices Connected
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홈페이지  http://www.analog.com
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AD7193 데이터시트(HTML) 4 Page - Analog Devices

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CN-0287
Circuit Note
Rev. C | Page 4 of 9
Temperature measurement is a high precision and low speed
application, therefore there is adequate settling time available to
switch the single current source between all 4 channels,
providing excellent channel-to-channel matching, low cost, and
small PCB footprint.
The ADG738 is an 8-to-1 multiplexer that switches the current
source between channels. In order to support the 2-, 3-, and 4-
wire RTD configurations, each of the four channels need two
switches.
In many applications, the RTD may be located remotely from
the measurement circuit. The resistance from the long lead
wires can generate large errors, especially for low resistance
RTDs. In order to minimize the effect of the lead resistance, a 3-
wire RTD configuration is supported as shown in Figure 3.
Figure 3. Connector and Jumper Configuration for3-Wire RTD Sensor
With S1 of the ADG738 closed and S2 opened, the voltage at
the input of AD7193 is V1. With S1 opened and S2 closed, the
voltage on the input of AD7193 is V2, The voltage across the
RTD sensor is VRTD, the exciting current from the current source is
IEXC. V1 and V2 contain the error generated by the lead resistance
as shown below:
EXC
W3
RTD
1
I
R
R
V
×
+
=
)
(
(1)
EXC
W3
RTD
W2
2
I
R
R
R
V
×
+
+
=
)
(
(2)
EXC
RTD
RTD
I
R
V
×
=
(3)
Assuming RW1 = RW2 = RW3 and combining Equations 1, 2, and 3
yields:
VRTD = 2V1 – V2
(4)
RRTD = VRTD/IEXC = (2V1 – V2)/IEXC
(5)
Equation 5 shows that the 3-wire configuration requires two
separate measurements (V1 and V2) in order to calculate RRTD,
thereby decreasing the output data rate. In most applications
this is not a problem.
The 4-wire RTD connection requires two extra sense lines, but
is insensitive to wiring resistances and only requires one
measurement.
Figure 4 summarizes the connector configuration and jumper
placements for RTD 2-wire, RTD 3-wire, RTD 4-wire, and
thermocouple applications.
Figure 4. Connector Configuration and Jumper Placements for EVAL-CN0287-SDPZ Board
AD7193
REFIN2(-)
REFIN2(+)
AIN2
AIN1
S1
D
ADG738
RTD
IEXC
IEXC
S2
JP[x]
+5V
RRTD
RREF
RW1
RW2
RW3
CURRENT SOURCE
+5V
RTD 2-WIRE
RTD 3-WIRE
RTD 4-WIRE
THERMOCOUPLE
JPx
2
1
3
2
1
3
4
CNx
RTD
RTD
JPx
2
1
3
2
1
3
4
CNx
JPx
2
1
3
2
1
3
4
CNx
JPx
2
1
3
2
1
3
4
CNx
TC
+
RTD


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