AD623 Instrumentation Amplifiers Analog Devices AD623 Instrumentation Amplifiers are integrated, single- or dual-supply amplifiers designed to deliver rail-to-rail output swing using supply voltages from 3V to 12V. The AD623 Amplifiers offer superior user flexibility by allowing single gain set resistor programming and by conforming to the 8-lead industry standard pinout configuration. With no external resistor, the AD623 is configured for unity gain (G = 1), and with an external resistor, the AD623 can be programmed for gains of up to 1000.