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AD590 Datenblatt(PDF) 3 Page - Intersil Corporation

Teilenummer AD590
Bauteilbeschribung  2-Wire, Current Output Temperature Transducer
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Hersteller  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

AD590 Datenblatt(HTML) 3 Page - Intersil Corporation

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3
Trimming Out Errors
The ideal graph of current versus temperature for the AD590
is a straight line, but as Figure 1 shows, the actual shape is
slightly different. Since the sensor is limited to the range of
-55oC to 150oC, it is possible to optimize the accuracy by
trimming.
Trimming
also
permits
extracting
maximum
performance from the lower-cost sensors.
The circuit of Figure 2 trims the slope of the AD590 output.
The effect of this is shown in Figure 3.
The circuit of Figure 4 trims both the slope and the offset.
This is shown in Figure 5. The diagrams are exaggerated to
show effects, but it should be clear that these trims can be
used to minimize errors over the whole range, or over any
selected part of the range. In fact, it is possible to adjust the
I-grade device to give less than 0.1oC error over the range
0oC to 90oC and less than 0.05oC error from 25oC to 60oC.
FIGURE 1. TRIMMING OUT ERRORS
T (oK)
IDEAL
ACTUAL
(GREATLY
EXAGGERATED)
FIGURE 2. SLOPE TRIMMING
+5V
R 100
+
AD590
-
R = SLOPE
+
+
950
VOUT = 1mV/
oK
FIGURE 3. EFFECT OF SLOPE TRIM
T (oK)
IDEAL
ACTUAL
TRIMMED
FIGURE 4. SLOPE AND OFFSET TRIMMING
+10V
35.7k
R1 2kΩ
+
AD590
-
V
-
R1 = OFFSET
R2 = SLOPE
VOUT = 100mV/
oC
97.6k
Ω R2 5kΩ
FIGURE 5A. UNTRIMMED
FIGURE 5B. TRIM ONE: OFFSET
FIGURE 5C. TRIM TWO: SLOPE
AD590


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