MAX22531 Datasheet | Analog Devices

Description The MAX22530- MAX22532 are galvanically isolated, 4channel, multiplexed, 12-bit, analog-to-digital converters (ADC) in the MAXSafe™ family product line. An integrated, isolated, DC-DC converter powers all fieldside circuitry, and this allows field-side diagnostics even when no input signal is present. The MAX22530- MAX22532 family continually digitizes the input voltage on the field-side of an isolation barrier and transmits the data across the isolation barrier to the logic-side of the devices where the magnitude of the input voltage is pared to programmable thresholds. The 12-bit ADC core has a sample rate of 20ksps (typ) per-channel. ADC data is available through the SPI interface either directly or filtered. Filtering averages the most recent 4 readings depending on the setting. Each input has a parator with programmable high and low thresholds, and an interrupt is asserted when any input crosses its programmed level based on the mode setting. The parator output pin (COUT_) is high when the input voltage is above the upper threshold and low when it is below the lower threshold in digital input mode. Typical response time of the parator to an input change is less than 75µs with filtering disabled. With filtering enabled, the parator uses the moving average of the last 4 ADC readings. The MAX22530 in a 16-pin wide SOIC package provides 8mm of creepage and clearance, and 5k VRMS isolation. The MAX22531 in a 20-pin SSOP package and the MAX22532 in a 28-pin SSOP package, both provide 5.5mm of creepage and clearance, and 3.5k VRMS isolation. All package material has a minimum parative tracking index (CTI) of 400, which gives it a group II rating in creepage tables. All devices are rated for operation at ambient temperatures between -40°C to +125°C. Applications - High-Voltage Binary Input - Substation Automation - Distribution Automation - Process Automation - Motion Control Benefits and Features - Enable Robust Detection of Multichannel Analog/Binary...