AD22105 Analog Devices, AD22105 Datasheet
AD22105
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AD22105 Summary of contents
Page 1
... Analog Devices. Low Voltage, Resistor Programmable R PULL–UP The AD22105 is designed to operate on a single power supply voltage from +2 +7.0 V facilitating operation in battery powered applications as well as in industrial control systems. Because of low power dissipation (230 W @ 3.3 V), self- heating errors are minimized and battery life is maximized ...
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... OPEN COLLECTOR OUTPUT Output Low Voltage POWER SUPPLY Supply Range Supply Current, Output “LOW” Supply Current, Output “HIGH” INTERNAL PULL-UP RESISTOR TURN-ON SETTLING TIME NOTES 1 The AD22105 will operate at voltages as low as +2.2 V. Specifications subject to change without notice ...
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... ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD22105 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality ...
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... AD22105–Typical Performance Characteristics 4 GUARANTEED LIMIT (+) –1 –2 –3 GUARANTEED LIMIT (–) –4 –50 – TEMPERATURE – C Figure 3. Error vs. Setpoint 0.1 0.3 0.5 0.7 0.9 1.1 –50 – TEMPERATURE – C Figure 4. Setpoint Error Due – ...
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... REV. 0 250 200 T = +150 C A 150 = +25 C 100 T = – 1mA 10mA Figure 11. Thermal Resistance vs. Flow Rate = LOW) 100 800 1200 –5– AD22105 0 400 800 FLOW RATE – CFM 90 80 MOVING AIR 70 (1200 CFM) 60 STILL AIR ...
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... Note that this curve shows additional error beyond the initial accuracy error of the part and should be added to the value found in the specifications table. For example, consider using the AD22105 programmed to switch at +125 C. Figure 4 indicates that at +125 C, the additional error is approximately –0.2 C correct nominal value) is chosen, then the additional error could be – ...
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... OUTPUT SECTION The output of the AD22105 is the collector of an NPN transistor. When the ambient temperature of the device exceeds the programmed setpoint temperature, this transistor is activated causing its collector to become a low impedance. A pull-up resistor, such as the internal 200 k provided, is needed to observe a change in the output voltage. For versatility, the optional pull-up resistor has not been permanently connected to the output pin ...
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... SET moist environment or printed circuit board contamination, can have an adverse effect on the programmed setpoint temperature of the AD22105. Depending on its source, leakage current can flow into or out of the R pin. Consequently, the actual SET setpoint temperature could be higher or lower than the intended setpoint temperature by about 1 C for each leakage ...