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AD420 Datasheet(PDF) 10 Page - Analog Devices |
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AD420 Datasheet(HTML) 10 Page - Analog Devices |
10 / 11 page REV. F –10– AD420 AD420 PROTECTION TRANSIENT VOLTAGE PROTECTION The AD420 contains ESD protection diodes which prevent damage from normal handling. The industrial control environ- ment can, however, subject I/O circuits to much higher tran- sients. In order to protect the AD420 from excessively high voltage transients such as those specified in IEC 801, external power diodes and a surge current limiting resistor may be re- quired, as shown in Figure 14. The constraint on the resistor is that during normal operation the output voltage level at IOUT must remain within its voltage compliance limit (IOUT × (Rp + R LOAD) ≤ V CC – 2.5 V) and the two protection diodes and resistor must have appropri- ate power ratings. IOUT GND VCC RP RLOAD VCC AD420 Figure 14. Output Transient Voltage Protection BOARD LAYOUT AND GROUNDING The AD420 ground pin, designated GND, is the “high quality” ground reference point for the device. Any external loads on the REF OUT and VOUT pins of the AD420 should be returned to this reference point. Analog and digital ground currents should not share a common path. Each signal should have an appropri- ate analog or digital signal return routed close to it. Using this approach, signal loops enclose a small area, minimizing the inductive coupling of noise. Wide PC tracks, large gauge wire, and ground planes are highly recommended to provide low impedance signal paths. POWER SUPPLIES AND DECOUPLING The AD420 supply pins, VCC (Pin 23) and VLL (Pin 2), should be decoupled to GND with 0.1 µF capacitors to eliminate high frequency noise that may otherwise get coupled into the analog system. High frequency ceramic capacitors are recommended. The decoupling capacitors should be located in close proximity to the pins and the ground line to have maximum effect. Further reductions in noise, and improvements in performance, may be achieved by using a larger value capacitor on the VLL pin. |
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