Issue link: https://resources.mouser.com/i/1437657
32 ADI | Industry 4.0 and Beyond The combination of the AD5423 single-channel, 16-bit I/V output digital-to-analog converter (DAC) and ADG5401F overvoltage protected single pole single throw (SPST) switch from Analog Devices align with these control needs and are suited to the requirements for analog output modules. Precision Precision is a key feature of the AD5423. In voltage out mode, Total Adjusted Error (TUE) is as low as ±0.01% at 25°C (±0.05% across temperature) with typical output drift of 0.35 ppm FSR/°C. In current out mode, TUE is also ±0.01% at 25°C with typical output drift of 2ppm FSR/°C. Differential nonlinearity (DNL) in all output modes is ±1LSB and guaranteed monotonic. Figure 1: AD5423 and ADG5401F configuration. (Source: Analog Devices Inc.) Figure 2: ADG5401F circuit diagram. (Source: Analog Devices, Inc.) The ADG5401F precision switch has an on- resistance (RON) specification of 6Ω and has an integrated secondary feedback channel used to connect the channel I OUT /V OUT to the +VSENSE input on the AD5423; this removes any error associated with the variation in on-resistance of the ADG5401F. The maximum on-leakage of the ADG5401F across temperature is 40nA. This leakage accounts for less than 1LSB on a 16-bit, 4mA to 20mA current output DAC maintaining precision in the output signal chain and maximizing dynamic range. Robustness The ADG5401F overvoltage-protected SPST switch is used on the analog output of the AD5423 DAC to protect against overvoltage conditions in both the powered and unpowered state. The ADG5401F can tolerate up to ±60V overvoltage on the source (S) and source feedback (SFB) pins. This will protect precision analog output nodes vulnerable to damage caused by loss of system power, miswiring, power supply sequencing issues, etc. Figure 1 details how the AD5423 and the ADG5401F should be connected in an analog output module. 1 2