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參數(shù)資料
| 型號： | AD590 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Two-Terminal IC Temperature Transducer(兩端口溫度傳感器) |
| 中文描述： | 雙終端集成電路溫度傳感器（兩端口溫度傳感器） |
| 文件頁數(shù)： | 5/12頁 |
| 文件大?。?/td> | 157K |
| 代理商： | AD590 |
E X PLANAT ION OF T E MPE RAT URE SE NSOR
SPE CIFICAT IONS
T he way in which the AD590 is specified makes it easy to apply
in a wide variety of different applications. It is important to
understand the meaning of the various specifications and the
effects of supply voltage and thermal environment on accuracy.
T he AD590 is basically a PT AT (proportional to absolute
temperature)
1
current regulator. T hat is, the output current is
equal to a scale factor times the temperature of the sensor in
degrees K elvin. T his scale factor is trimmed to 1
μ
A/K at the
factory, by adjusting the indicated temperature (i.e., the output
current) to agree with the actual temperature. T his is done with
5 V across the device at a temperature within a few degrees of
+25
°
C (298.2K ). T he device is then packaged and tested for
accuracy over temperature.
CALIBRAT ION E RROR
At final factory test the difference between the indicated
temperature and the actual temperature is called the calibration
error. Since this is a scale factory error, its contribution to the
total error of the device is PT AT . For example, the effect of the
1
°
C specified maximum error of the AD590L varies from 0.73
°
C
at –55
°
C to 1.42
°
C at 150
°
C. Figure 3 shows how an exagger-
ated calibration error would vary from the ideal over temperature.
Figure 3. Calibration Error vs. Temperature
T he calibration error is a primary contributor to maximum total
error in all AD590 grades. However, since it is a scale factor
error, it is particularly easy to trim. Figure 4 shows the most
elementary way of accomplishing this. T o trim this circuit the
temperature of the AD590 is measured by a reference tempera-
ture sensor and R is trimmed so that V
T
= 1 mV/K at that
temperature. Note that when this error is trimmed out at one
temperature, its effect is zero over the entire temperature range.
In most applications there is a current-to-voltage conversion
resistor (or, as with a current input ADC, a reference) that can
be trimmed for scale factor adjustment.
Figure 4. One Temperature Trim
1
T (
°
C) = T (K ) –273.2; Zero on the K elvin scale is “absolute zero”; there is no
lower temperature.
E RROR VE RUS T E MPE RAT URE : WIT H CALIBRAT ION
E RROR T RIMME D OUT
Each AD590 is tested for error over the temperature range with
the calibration error trimmed out. T his specification could also
be called the “variance from PT AT ” since it is the maximum
difference between the actual current over temperature and a
PT AT multiplication of the actual current at 25
°
C. T his error
consists of a slope error and some curvature, mostly at the
temperature extremes. Figure 5 shows a typical AD590K
temperature curve before and after calibration error trimming.
Figure 5. Effect to Scale Factor Trim on Accuracy
E RROR VE RSUS T E MPE RAT URE : NO USE R T RIMS
Using the AD590 by simply measuring the current, the total
error is the “variance from PT AT ” described above plus the
effect of the calibration error over temperature. For example the
AD590L maximum total error varies from 2.33
°
C at –55
°
C to
3.02
°
C at 150
°
C. For simplicity, only the large figure is shown
on the specification page.
NONLINE ARIT Y
Nonlinearity as it applies to the AD590 is the maximum
deviation of current over temperature from a best-fit straight
line. T he nonlinearity of the AD590 over the –55
°
C to +150
°
C
range is superior to all conventional electrical temperature
sensors such as thermocouples. RT Ds and thermistors. Figure 6
shows the nonlinearity of the typical AD590K from Figure 5.
Figure 6. Nonlinearity
Figure 7A shows a circuit in which the nonlinearity is the major
contributor to error over temperature. T he circuit is trimmed by
adjusting R
1
for a 0 V output with the AD590 at 0
°
C. R
2
is then
adjusted for 10 V out with the sensor at 100
°
C. Other pairs of
temperatures may be used with this procedure as long as they
are measured accurately by a reference sensor. Note that for
+15 V output (150
°
C) the V+ of the op amp must be greater
than 17 V. Also note that V– should be at least –4 V: if V– is
ground there is no voltage applied across the device.
Understanding the Specifications–AD590
REV. B
–5–
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