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參數(shù)資料
| 型號(hào)： | TMP01GBC |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | CONNECTOR ACCESSORY |
| 中文描述： | ANALOG TEMP SENSOR-VOLTAGE, 2.49-2.5V, 1.50Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | 0.078 X 0.071 INCH, DIE-8 |
| 文件頁(yè)數(shù)： | 15/16頁(yè) |
| 文件大?。?/td> | 377K |
| 代理商： | TMP01GBC |
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TMP01
REV. C
–15–
T ranslating 5 mV/K to 10 mV/
°
C
A useful circuit is shown in Figure 23 that translates the VPT AT
output voltage, which is calibrated in K elvins, into an output
that can be read directly in degrees Celsius on a voltmeter
display. T o accomplish this, an external amplifier is configured
as a differential amplifier. T he resistors are scaled so the VREF
voltage will exactly cancel the VPT AT voltage at 0.0
°
C.
5
1
+15V
–15V
10pF
V
OUT
(10mV/
°
C)
(V
OUT
= 0.0V @ T = 0.0
°
C)
487
7
6
4
3
2
OP177
100k
100k
4.12k
VPTAT
VREF
TMP01
4.22k
105k
Figure 23. Translating 5 mV/K to 10 mV/
°
C
However, the gain from VPT AT to the output is two, so that
5 mV/K becomes 10 mV/
°
C. T hus, for a temperature of +80
°
C,
the output voltage is 800 mV. Circuit errors will be due prima-
rily to the inaccuracies of the resistor values. Using 1% resistors
the observed error was less than 10 mV, or 1
°
C. T he 10 pF
feedback capacitor helps to ensure against oscillations. For bet-
ter accuracy, a adjustment potentiometer can be added in series
with either 100 k
resistor.
T ranslating VPT AT to the Fahrenheit Scale
A very similar circuit to the one shown in Figure 23 can be used
to translate VPT AT into an output that can be read directly in
degrees Fahrenheit, with a scaling of 10 mV/
°
F. Only unity gain
or less is available from the first stage differentiating circuit, so
the second amplifier provides a gain of two to complete the con-
version to the Fahrenheit scale. Using the circuit in Figure 24, a
temperature of 0.0
°
F gives an output of 0.00 V. At room tem-
perature (70
°
F) the output voltage is 700 mV. A –40
°
C to
+85
°
C operating range translates into –40
°
F to +185
°
F. T he
errors are essentially the same as for the circuit in Figure 23.
V
= 0.0V @ T = 0.0
°
F
(10mV/
°
F)
5
1
+15V
–15V
10pF
121
7
6
4
3
2
1/2
OP297
100k
100k
6.49k
VPTAT
VREF
TMP01
1.0k
90.9k
100k
7
6
5
1/2
OP297
100k
Figure 24. Translating 5 mV/K to 10 mV/
°
F
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