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ADW75001Z-0REEL7 Folha de dados(PDF) 8 Page - Analog Devices |
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ADW75001Z-0REEL7 Folha de dados(HTML) 8 Page - Analog Devices |
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8 / 20 page  TMP35/TMP36/TMP37 Rev. F | Page 8 of 20 FUNCTIONAL DESCRIPTION An equivalent circuit for the TMP3x family of micropower, centigrade temperature sensors is shown in Figure 22. The core of the temperature sensor is a band gap core that comprises transistors Q1 and Q2, biased by Q3 to approximately 8 μA. The band gap core operates both Q1 and Q2 at the same collector current level; however, because the emitter area of Q1 is 10 times that of Q2, the VBE of Q1 and the VBE of Q2 are not equal by the following relationship: ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ × = Δ E,Q2 E,Q1 T BE A A V V ln Resistors R1 and R2 are used to scale this result to produce the output voltage transfer characteristic of each temperature sensor and, simultaneously, R2 and R3 are used to scale the VBE of Q1 as an offset term in VOUT. Table 4 summarizes the differences in the output characteristics of the three temperature sensors. The output voltage of the temperature sensor is available at the emitter of Q4, which buffers the band gap core and provides load current drive. The current gain of Q4, working with the available base current drive from the previous stage, sets the short-circuit current limit of these devices to 250 μA. SHUTDOWN VOUT +VS 3X 25µA 2X Q2 1X R1 R2 R3 7.5µA Q3 2X GND Q4 Q1 10X 6X Figure 22. Temperature Sensor Simplified Equivalent Circuit Table 4. TMP3x Output Characteristics Sensor Offset Voltage (V) Output Voltage Scaling (mV/°C) Output Voltage @ 25°C (mV) TMP35 0 10 250 TMP36 0.5 10 750 TMP37 0 20 500 |
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Descrição semelhante - ADW75001Z-0REEL7 |
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