AD8221 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS AD8221–IN18+VSRG27VOUTRG36REF+IN45–VS 3 0 -1 TOP VIEW 9 4 (Not to Scale) 1 3 0 Figure 3. Pin Configuration Table 5. Pin Function Descriptions Pin No.MnemonicDescription 1 −IN Negative Input Terminal. 2 R Gain Setting Terminal. Place resistor across the R pins to set the gain. G = 1 + (49.4 kΩ/R ). G G G 3 R Gain Setting Terminal. Place resistor across the R pins to set the gain. G = 1 + (49.4 kΩ/R ). G G G 4 +IN Positive Input Terminal. 5 −V Negative Power Supply Terminal. S 6 REF Reference Voltage Terminal. Drive this terminal with a low impedance voltage source to level-shift the output. 7 V Output Terminal. OUT 8 +V Positive Power Supply Terminal. S Rev. C | Page 9 of 24