400k samples per second — what it buys the design
The MAX1280BEUP+ is a 12-bit successive-approximation ADC from Maxim Integrated that samples at 400k samples per second across a 4- or 8-channel input multiplexer. The SAR architecture gives you a deterministic conversion time with no pipeline delay, so each sample is a clean snapshot of the analog input at that instant. With a 1:1 S/H-to-ADC ratio, the track-and-hold captures the multiplexed signal before conversion starts — useful when you're scanning multiple sensor channels and need to avoid crosstalk between acquisitions.
Input mux and signal types
The front-end mux accepts either pseudo-differential or single-ended inputs, configurable per channel. Pseudo-differential mode gives you common-mode rejection on each channel pair without the full differential input stage, which helps when the sensor return is a few hundred millivolts away from the ADC ground. Single-ended mode doubles the channel count to 8, but trades off noise rejection. The reference can be internal or external, so you can match the ADC span to the sensor output range rather than scaling externally.
Industrial temperature and supply
Rated for -40 to 85°C operation, the MAX1280BEUP+ fits factory-floor data acquisition, outdoor instrumentation, and equipment that sees seasonal temperature swings. Both analog and digital supplies run from a single 5 V rail, simplifying the power tree — no separate analog and digital regulators needed. The SPI data interface keeps the digital side clean and lets you daisy-chain multiple ADCs on a shared bus without extra GPIOs.
Package and footprint
Housed in a 20-pin TSSOP (4.40 mm wide body), the device is a surface-mount part that routes easily on a two-layer board. The 0.65 mm pitch is standard for TSSOP — no fine-pitch rework issues. The supplier device package is 20-TSSOP, same as the case code, so the footprint is consistent across the MAX1280 family.
Lifecycle and compliance
The MAX1280BEUP+ carries an Active product status — no end-of-life notice, no last-time-buy window to track. ROHS3 compliant per the listing, so it passes the current EU directive without exemption paperwork. For a production BOM that needs a 12-bit, 400k SPS ADC with an input mux, this part is a clean fit without obsolescence risk.