Eight-channel SAR ADC in a 16-TSSOP — what the 125k SPS rate buys you
The AD7888ARUZ from Analog Devices is a 12-bit SAR ADC that multiplexes eight single-ended inputs through a single conversion core. Sampling at 125k samples per second, it keeps up with eight slow-to-moderate sensor channels. The part runs on a single 2.7 V to 5.25 V supply for both analog and digital rails, which keeps the power tree simple: one regulator feeds the whole ADC. The SPI/DSP serial interface connects directly to most microcontrollers without glue logic, and the reference can be either the internal bandgap or an external precision source — your call based on the accuracy budget.
Supply range and temperature grade — where it fits on the board
Rated for -40°C to 105°C, this ADC handles industrial enclosures, motor-drive cabinets, and outdoor telecom shelters without needing a mil-spec part. The 16-TSSOP package is a 4.4 mm-wide body — small enough for dense multi-channel boards but still hand-solderable for prototypes. Surface-mount only; no through-hole variant exists. The single-ended input configuration means each of the eight channels measures the voltage between that pin and a common ground. If your signals are differential or floating, you will need an external op-amp stage to convert them to single-ended before the ADC. The 1:1 S/H-to-ADC ratio means the sample-and-hold captures the muxed channel and holds it for one conversion cycle — no simultaneous sampling across channels.
Lifecycle and sourcing reality
That means you can qualify it into a new BOM without worrying about a forced redesign mid-cycle.