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參數(shù)資料
| 型號： | ADT50 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Low Voltage SOT-23 Temperature Sensors(低壓溫度傳感器) |
| 中文描述： | 低壓SOT - 23封裝溫度傳感器（低壓溫度傳感器） |
| 文件頁數(shù)： | 11/12頁 |
| 文件大小： | 168K |
| 代理商： | ADT50 |
ADT45/ADT50
–11–
REV. 0
AD654
SENSOR
ADT45
ADT50
R
T
(R1+P1)
11.8k
V
+ 500
V
16.2k
V
+ 500
V
C
T
1.7nF
1.8nF
+5V
0.1
m
F
V
S
C
T
V
OUT
GND
ADT45/50
R
PU
5k
V
f
OUT
10
m
F/0.1
m
F
R1
P1
R
T
P2
100k
V
+5V
R
OFF1
470
V
f
OFFSET
R
OFF2
10
V
NB: ATT
A
(min), f
OUT
= 0Hz
Figure 24. A Temperature-to-Frequency Converter
An offset trim network (f
OUT
OFFSET ) is included with this
circuit to set f
OUT
at 0 Hz when the temperature sensor’s mini-
mum output voltage is reached. Potentiometer P1 is required to
calibrate the absolute accuracy of the AD654. T he table in the
figure illustrates the circuit element values for each of the three
sensors. T he nominal offset voltage required for 0 Hz output
from the ADT 45 is 50 mV; for the ADT 50, the offset voltage
required is 100 mV. In all cases for the circuit values shown, the
output frequency transfer characteristic of the circuit was set at
50 Hz/
°
C. At the receiving end, a frequency-to-voltage converter
(FVC) can be used to convert the frequency back to a dc voltage
for further processing. One such FVC is the AD650.
For complete information on the AD650 and AD654, please
consult the individual data sheets for those devices.
Driving Long Cables or Heavy Capacitive Loads
Although the ADT 45/ADT 50 temperature sensors are capable
of driving capacitive loads up to 10,000 pF without oscillation,
output voltage transient response times can be improved with
the use of a small resistor in series with the output of the tem-
perature sensor, as shown in Figure 26. As an added benefit,
this resistor forms a low-pass filter with the cable’s capacitance,
which helps to reduce bandwidth noise. Furthermore, since the
temperature sensor is likely to be used in environments where
the ambient noise level can be very high, this resistor helps to
prevent rectification by the devices of the high frequency noise.
T he combination of this resistor and the supply bypass capacitor
offers the best protection.
ADT45/50
GND
+V
S
0.1
m
F
V
OUT
750
V
LONG CABLE OR
HEAVY CAPACTIVE LOADS
Figure 26. Driving Long Cables or Heavy Capacitive Loads
Commentary on Long-T erm Stability
T he concept of long-term stability has been used for many years
to describe by what amount an IC’s parameter would shift dur-
ing its lifetime. T his is a concept that has been typically applied
to both voltage references and monolithic temperature sensors.
Unfortunately, integrated circuits cannot be evaluated at room
temperature (+25
°
C) for 10 years or so to determine this shift.
As a result, manufacturers very typically perform accelerated
lifetime testing of integrated circuits by operating ICs at
elevated temperatures (between +125
°
C and +150
°
C) over a
shorter period of time (typically, between 500 and 1000 hours).
REF193
+
+3V
1
m
F
R2*
P2*
4mA
ADJUST
R1*
V
OUT
V
S
ADT45/50
P1*
20mA
ADJUST
GND
R3*
D1
R3*
R5
100k
V
R6
100k
V
R7
100
V
Q1
2N1711
D1: HP5082–2810
I
L
OP193
*SEE TEXT
FOR VALUES
V
OUT
RL
250
V
V
+9V TO +18V
Figure 25. A Temperature to 4 mA-to-20 mA Loop Transmitter
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