ZX76-31A-SNS+ is a 5-bit digital step attenuator with serial control and dual positive & negative supply voltage inputs. Attenuation can be set from 0 to 31 dB in 1 dB steps, with 0.1 dB typical accuracy. The attenuator is housed in a compact unibody package, with SMA RF connections and a snap-fit control input. The serial 3-wire serial control interface supports simple integration with a wide range of microcontroller and custom I/O (input / output) control systems. Data is clocked into the internal shift register using 5V logic levels and then latched to set the attenuation. For applications requiring Ethernet / USB control and software support, please review Mini-Circuits’ R_DAT series of programmable attenuators at  https://www.mcdi-ltd.com/rf-programmable-attenuators/