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參數資料
| 型號： | ADT14GS |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 圓形連接器 |
| 英文描述： | Circular Connector; No. of Contacts:61; Series:LJT07R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:25; Circular Contact Gender:Socket; Circular Shell Style:Jam Nut Receptacle; Insert Arrangement:25-61 |
| 中文描述： | 四設定，可編程溫度監視器和控制器 |
| 文件頁數： | 13/16頁 |
| 文件大小： | 338K |
| 代理商： | ADT14GS |
ADT14
–13–
REV. 0
Out-of-Range Warning
In Figure 25, connecting an open-collector output of the
ADT14 and an inverted open-collector output together into a
wired-OR configuration, a temperature “out-of-range” warning
signal is generated. This can be useful in sensitive equipment
calibrated to work over a limited temperature range.
TEMP
SENSOR
& VOLTAGE
REFERENCE
HYSTERESIS
GENERATOR
13
14
15
9
10
11
12
16
6
7
8
1
2
3
4
5
NC
NC
V
REF
47k
200
LED
V+
NC
NC = NO CONNECT
ADT14
2N1711
Figure 25. Out-of-Range Warning
Translating 5 mV/K to 10 mV/
8
C
A useful circuit is shown in Figure 26 that translates the
VPTAT output voltage, which is calibrated in Kelvins, into an
output that can be read directly in degrees Celsius on a voltme-
ter display. To accomplish this, an external amplifier is config-
ured as a differential amplifier. The resistors are scaled so the
V
REF
voltage will exactly cancel the VPTAT voltage at 0.0
°
C.
6
7
2
3
4
OP177
+15V
105k
4.22k
10pF
–15V
100k
100k
4.12k
487
V
OUT
(10mV/
°
C)
(V
OUT
= 0.0V
@ T = 0.0
°
C)
ADT14
V
REF
VPTAT
14
6
Figure 26. Translating 5 mV/K to 10 mV/
8
C
However, the gain from VPTAT to the output is two, so that
5 mV/K becomes 10 mV/
°
C. Thus, 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. The 10 pF
feedback capacitor helps to cancel the effects of stray capaci-
tance that could cause oscillations. For improved accuracy, an
adjustment potentiometer can be added in series with either
100 k
resistor.
Translating VPTAT to the Fahrenheit Scale
A similar circuit to the one shown in Figure 26 can be used to
translate VPTAT 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
conversion to the Fahrenheit scale. Using the circuit in Figure
27, a temperature of 0.0
°
F gives an output of 0.00 V. At room
temperature (77
°
F) the output voltage is 770 mV. A –40
°
C to
+85
°
C operating range translates into –40
°
F to +85
°
F. The
errors are essentially the same as for the circuit in Figure 26.
6
7
2
3
4
1/2 OP297
+15V
90.9k
1k
10pF
–15V
100k
100k
6.49k
121
ADT14
V
REF
VPTAT
14
6
7
6
5
1/2 OP297
100k
100k
Figure 27. Translating 5 mV/K to 10 mV/
8
F
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