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TMP36FSZ-REEL View Datasheet(PDF) - Analog Devices

Part Name
Description
View to exact match
TMP36FSZ-REEL
ADI
Analog Devices ADI
TMP36FSZ-REEL Datasheet PDF : 20 Pages
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The same circuit principles can be applied to the TMP36, but
because of the inherent offset of the TMP36, the circuit uses only
two resistors, as shown in Figure 26. In this circuit, the output
voltage transfer characteristic is 1 mV/°F but is referenced to
the common ground of the circuit; however, there is a 58 mV
(58°F) offset in the output voltage. For example, the output
voltage of the circuit reads 18 mV if the TMP36 is placed in a
−40°F ambient environment and 315 mV at +257°F.
+VS
0.1µF
+VS
TMP36 VOUT
GND
R1
45.3k
R2 VOUT @ 1mV/°F 58°F
10k
TMP35/TMP36/TMP37
At the expense of additional circuitry, the offset produced by
the circuit in Figure 26 can be avoided by using the circuit in
Figure 27. In this circuit, the output of the TMP36 is conditioned
by a single-supply, micropower op amp, the OP193. Although
the entire circuit operates from a single 3 V supply, the output
voltage of the circuit reads the temperature directly, with a
transfer characteristic of 1 mV/°F, without offset. This is accom-
plished through an ADM660, which is a supply voltage inverter.
The 3 V supply is inverted and applied to the V− terminal of the
OP193. Thus, for a temperature range between −40°F and +257°F,
the output of the circuit reads −40 mV to +257 mV. A general
expression for the transfer equation of the circuit is given by
VOUT
=
⎜⎛
⎜⎝
R6
R5 + R6
⎟⎞
⎟⎠
⎜⎜⎝⎛1 +
R4
R3
⎟⎟⎠⎞(TMP36 ) − ⎜⎝⎛
R4 ⎟⎞⎜⎛ VS
R3 ⎠⎝ 2
⎟⎞
VOUT @ –40°F = 18mV
VOUT @ +257°F = 315mV
Figure 26. TMP36 Fahrenheit Thermometer Version 1
+3V
+
10µF/0.1µF
R1
50k
R2
50k
+VS
TMP36 VOUT
GND
C1 +
10µF
ELEMENT
R3
R4
R5
R6
VALUE
258.6k
10k
47.7k
10k
NC
+
10µF
R3
R4
0.1µF
7
2
OP193
R5
3
6
+
R6
4
8
1
5
2
ADM660
6
4
3
7
–3V
+ 10µF
NC
Figure 27. TMP36 Fahrenheit Thermometer Version 2
VOUT @ 1mV/°F
–40°F TA +257°F
Rev. F | Page 11 of 20
 

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