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AD22105ARZ 데이터시트(PDF) 8 Page - Analog Devices |
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AD22105ARZ 데이터시트(HTML) 8 Page - Analog Devices |
8 / 8 page AD22105 REV. 0 –8– Leakage at the RSET Pin Leakage currents at the RSET pin, such as those generated from a 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 RSET pin. Consequently, the actual setpoint temperature could be higher or lower than the intended setpoint temperature by about 1 °C for each 75 nA of leakage. With a 5 V power supply, an isolation resistance of 100 M Ω would create 50 nA of leakage current giving a setpoint temperature error of about 0.7 °C (the R SET pin is near ground potential). A guard ring can be placed around the RSET node to protect against leakage from the power supply pin (as shown in Figure 13). C1 PIN 1 OUT GND VS RSET Figure 13. Suggested PCB Layout OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 8-Lead SOIC (SO-8) 0.1968 (5.00) 0.1890 (4.80) 8 5 4 1 0.2440 (6.20) 0.2284 (5.80) PIN 1 0.1574 (4.00) 0.1497 (3.80) 0.0688 (1.75) 0.0532 (1.35) SEATING PLANE 0.0098 (0.25) 0.0040 (0.10) 0.0192 (0.49) 0.0138 (0.35) 0.0500 (1.27) BSC 0.0098 (0.25) 0.0075 (0.19) 0.0500 (1.27) 0.0160 (0.41) 8 ° 0 ° 0.0196 (0.50) 0.0099 (0.25) x 45 ° |
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