AD22105AR 查看數據表（PDF） - Analog Devices

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AD22105AR

Low Voltage, Resistor Programmable Thermostatic Switch

Analog Devices 

AD22105

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 MΩ

would create 50 nA of leakage current giving a setpoint

temperature error of about 0.7°C (the RSET 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).

VS

C1

RSET

OUTLINE DIMENSIONS

Dimensions shown in inches and (mm).

8-Lead SOIC

(SO-8)

0.1968 (5.00)

0.1890 (4.80)

8

0.1574 (4.00)

0.1497 (3.80) 1

5

0.2440 (6.20)

4 0.2284 (5.80)

PIN 1

0.0098 (0.25)

0.0040 (0.10)

0.0688 (1.75)

0.0532 (1.35)

0.0196 (0.50)

x 45°

0.0099 (0.25)

SEATING

PLANE

0.0500 0.0192 (0.49)

(1.27) 0.0138 (0.35)

BSC

0.0098 (0.25)

0.0075 (0.19)

8°

0° 0.0500 (1.27)

0.0160 (0.41)

PIN 1

OUT

GND

Figure 13. Suggested PCB Layout

–8–

REV. 0

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