12-bit, 133k SPS, eight channels — what the ratings mean for the BOM
The MAX186BCWP+ is a 12-bit data acquisition system (DAS) with a built-in 8-channel multiplexer, sampling at 133k samples per second. Eight multiplexed inputs let a single ADC serve multiple analog signals — thermocouple outputs, current-sense resistors, or potentiometer feedback — without external muxes or per-channel ADCs. The 12-bit resolution gives 4096 counts across the ±5V dual-supply range, so each LSB represents about 2.44 mV at the input, which is enough for most industrial sensor interfaces that don't need 16-bit precision. The serial data interface supports MICROWIRE, QSPI, and SPI — three common microcontroller serial buses. This means the part ties directly to the SPI port of a Cortex-M or similar MCU without glue logic; the firmware just clocks out the channel-select bits and reads back the conversion result. The 133k SPS rate is fast enough to oversample and average for noise reduction on slow signals, but not fast enough for audio or vibration capture above a few kHz.
The part requires dual ±5V supplies — a positive 5V rail and a negative 5V rail. If your board only has a single 5V supply, you need a charge-pump inverter or a separate -5V rail. The 20-SOIC wide-body package (0.295-inch width, 7.50 mm) is a standard surface-mount footprint.