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Электронный компонент: IL235Z

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IL235Z
Korzhenevskogo 12, Minsk, 220064, Republic of
Belarus
Fax: +375 (17) 278 28 22,
Phone: +375 (17) 278 07 11, 277 24 70, 277 24 61,
277 69 16
E-mail: belms@belms.belpak.minsk.by
URL: www.bms.by
I
NTEGRATED CIRCUIT OF TEMPERATURE SENSOR
(analog LM235Z, SGS-Thomson)
Microcircuit IL235Z is precision temperature sensor with calibration
capacity . Microcircuit operates as Zener diode with brake down
voltage being in direct proportion to to absolute temperature (10
mV/
O
K). Full dynamic resistance of the circuit is less than 1 hm at
operation current 450
...5 m. The sensor calibrated at the
temperature 25
O
,has typical error less than 1
O
in the temperature
range above 100
O
. The peculiarity of the circuit IL235Z is the linear
dependence of output voltage versus temperature.
IC features
calibration in
O
initial measurement accuracy 1
O
K
range of operating supply current from 450 to 5 m
Full dynamic resistance less than 1 hm
Packaged IC type:
IL235Z, TO-92
Bottom view
Figure 1 - Package pin
definitions
Figure 2 - circuitry IL235Z.
IL235Z
Korzhenevskogo 12, Minsk, 220064, Republic of
Belarus
Fax: +375 (17) 278 28 22,
Phone: +375 (17) 278 07 11, 277 24 70, 277 24 61,
277 69 16
E-mail: belms@belms.belpak.minsk.by
URL: www.bms.by
able 1 - Maximum ratings
Standard
Name of parameter
Symbol
min max
Unit of
measurement
IC current
reverse
direct
I
R
I
F
-
--
15
10
mA
Air operation temperature: *
- constant mode
- short-time
T
OPER
- 40
125
125
150
Storage temperature
T
stg
-65 150
Note - *T
J
150
able 2 - Temperature parameters.
Standard
Name of parameter
Symbol
min Type
max
Test
conditions
Temperature
Unit
output voltage, V
U
OUT
2,95 2,98 3,01 I
R
= 1 mA
25
V
Non-calibrated temperature
error
1
-
1
2
3
5
I
R
= 1 mA
25
-45
125
temperature error at calibration
25
2
-
0,5 1,5 I
R
= 1 mA
-45
125
Calibrated error in extended
temperature range
3
-
2
-
case
=
max
periodical
-45
125
Non-linearity of temperature
characteristic
4
-
0,3 1 I
R
= 1 mA
-55
150
able 3 - Electrical parameters
.
Standard
Name of parameter
Symbo
l
min type.
max
Test
conditions
Temperat
ure
Measurement of output voltage
in supply currents range


U
OUT
-
2,5 10
0,45 m
I
R
5 m
-45
125
mV
Dynamic impedance
R
1
-
0,5
-
I
R
= 1 m 25 Ohm
Temperature coefficient of
output voltage
-
+10
- -
25
mV/
Time constant:
-still air
-speed of air is 0,5 m/
- agitated oil
-
-
-
80
10
1
-
-
-
-
-45
125
Time stability
-
0,2
- -
125
/
1000
Note - Precise measurements done in agitated oil bath. For other conditions there should be taking into
consideration self-heating .
IL235Z
Korzhenevskogo 12, Minsk, 220064, Republic of
Belarus
Fax: +375 (17) 278 28 22,
Phone: +375 (17) 278 07 11, 277 24 70, 277 24 61,
277 69 16
E-mail: belms@belms.belpak.minsk.by
URL: www.bms.by
Change of reverse voltage, (mV)
Calibration error, (
)
Reverse current, (m)
Temperature , (
)
Figure 3 -Reverse voltage versus reverse current
Figure 4 - Calibration error versus temperature
Reverse current, (m)
Input and output voltage, (V)
reverse voltage, (V)
Time, (mks)
Figure 5 - Reverse current versus reverse voltage
Figure 6 - Output signal response time
IL235Z
Korzhenevskogo 12, Minsk, 220064, Republic of
Belarus
Fax: +375 (17) 278 28 22,
Phone: +375 (17) 278 07 11, 277 24 70, 277 24 61,
277 69 16
E-mail: belms@belms.belpak.minsk.by
URL: www.bms.by
Direct dynamic resistance , (hm)
Noise
density
(nV/
Hz)
Frequency, (Hz)
Frequency, (Hz)
Figure 7 - Dynamic resistance versus frequency
Figure 8 - Noise voltage

Thermal resistance, (
/Wt) Time
constant,
(
)
Air motion speed, (m/)
Air motion speed, (m/)
Figure 9 - Thermal resistance versus air motion
speed
Figure 10 - Time constant versus air motion
speed
IL235Z
Korzhenevskogo 12, Minsk, 220064, Republic of
Belarus
Fax: +375 (17) 278 28 22,
Phone: +375 (17) 278 07 11, 277 24 70, 277 24 61,
277 69 16
E-mail: belms@belms.belpak.minsk.by
URL: www.bms.by
Heat conduction , (%)
Heat conduction, (%)
Time, (min)
Time, (min)
Figure 11 - Time dependence of heat conduction in
still air
Figure 12 - Time dependence of heat
conduction in agitated oil
Direct voltage, (V)
Direct current, (m)
Figure 13 - Dependence of direct voltage on direct current

Information for application.
There is a simple technique of the device calibration for improving precision of temperature
measurement (see typical application circuits).
Calibration of the device occurs in one spot as the IC output voltage is proportional to absolute
temperature with sensor voltage extrapolation to 0 V at 0
(-273,15
). The errors in dependence
of output voltage on temperature are determined only by characteristic incline. Therefore bias
calibration at one temperature corrects errors in the whole temperature range. Output voltage of
calibrated or non calibrated circuit may be derived from the following equation:
V
OT
= VO
TO
To
T
;
where - unknown temperature;
- reference temperature (in
).
Nominally IC output calibrated to the value 10 mV/
.
To ensure measurement precision they apply some rules. Degradation of the precision when