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TMP35GRT-REEL7 Datasheet(PDF) 11 Page - Analog Devices |
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TMP35GRT-REEL7 Datasheet(HTML) 11 Page - Analog Devices |
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11 / 20 page  TMP35/TMP36/TMP37 Rev. F | Page 11 of 20 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. 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 TMP36 GND 0.1µF VOUT +VS R1 45.3kΩ R2 10kΩ +VS VOUT @ –40°F = 18mV VOUT @ +257°F = 315mV VOUT @ 1mV/°F – 58°F () ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ + ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ + = 2 1 S OUT V R3 R4 TMP36 R3 R4 R6 R5 R6 V Figure 26. TMP36 Fahrenheit Thermometer Version 1 ELEMENT R3 R4 R5 R6 VALUE VOUT R1 50kΩ +VS ADM660 TMP36 OP193 R2 50kΩ R3 R4 +3V C1 10µF R5 0.1µF 10µF –3V 10µF/0.1µF GND NC 10µF NC R6 1 2 3 4 5 6 7 2 3 4 6 7 8 258.6kΩ 10kΩ 47.7kΩ 10kΩ + + + + – + VOUT @ 1mV/°F –40°F ≤ TA ≤ +257°F Figure 27. TMP36 Fahrenheit Thermometer Version 2 |
Similar Part No. - TMP35GRT-REEL7 |
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Similar Description - TMP35GRT-REEL7 |
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