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AD8553 Scheda tecnica(PDF) 17 Page - Analog Devices |
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AD8553 Scheda tecnica(HTML) 17 Page - Analog Devices |
17 / 24 page AD8222 Rev. 0 | Page 17 of 24 The AD8222 should be decoupled with 0.1 μF bypass capacitors, one for each supply. The positive supply decoupling capacitor should be placed near Pin 16, and the negative supply decoupling capacitor should be placed near Pin 8. Each supply should also be decoupled with a 10 μF tantalum capacitor. The tantalum capacitor can be placed further away from the AD8222 and can generally be shared by other precision integrated circuits. Figure 46 shows an example layout. AD8222 1 2 3 4 12 11 9 56 7 8 13 14 15 16 0.1µF 0.1µF RG RG 10 Figure 46. Example Layout SOLDER WASH The solder process can leave flux and other contaminants on the board. When these contaminants are between the AD8222 leads and thermal pad, they can create leakage paths that are larger than the AD8222’s bias currents. A thorough washing process removes these contaminants and restores the AD8222’s excellent bias current performance. INPUT BIAS CURRENT RETURN PATH The input bias current of the AD8222 must have a return path to common. When the source, such as a thermocouple, cannot provide a return current path, one should be created, as shown in Figure 47. THERMOCOUPLE +VS REF –VS AD8222 CAPACITIVELY COUPLED +VS REF C C –VS AD8222 TRANSFORMER +VS REF –VS AD8222 INCORRECT CAPACITIVELY COUPLED +VS REF C R R C –VS AD8222 1 fHIGH-PASS = 2πRC THERMOCOUPLE +VS REF –VS 10MΩ AD8222 TRANSFORMER +VS REF –VS AD8222 CORRECT Figure 47. Creating an IBIAS Path INPUT PROTECTION All terminals of the AD8222 are protected against ESD (1 kV— human body model). In addition, the input structure allows for dc overload conditions of about 2½ V beyond the supplies. Input Voltages Beyond the Rails For larger input voltages, an external resistor should be used in series with each input to limit current during overload conditions. The AD8222 can safely handle a continuous 6 mA current. The limiting resistor can be computed from Ω 400 mA 6 − − ≥ SUPPLY IN LIMIT V V R For applications where the AD8222 encounters extreme overload voltages, such as cardiac defibrillators, external series resistors and low leakage diode clamps, such as the BAV199L, the FJH1100s, or the SP720, should be used. |
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