16-bit SAR with on-chip PGA — one part replaces a signal chain
The Maxim Integrated MAX1302AEUG+ is a 16-bit successive-approximation-register (SAR) ADC that integrates an input multiplexer, a programmable-gain amplifier (PGA), and a sample-and-hold into a single 24-TSSOP package. It samples at 115k samples per second over the SPI bus, accepting either differential or single-ended inputs through its 4 or 8 input channels (configured as 4 differential or 8 single-ended). The internal PGA lets you amplify small sensor signals before conversion, saving an external op-amp stage and its associated BOM cost and board area.
115k SPS at 16 bits — where the speed fits
At 115k samples per second and 16-bit resolution, this ADC sits in the sweet spot for industrial data-acquisition systems that need moderate throughput with real dynamic range. A 16-bit conversion at 115k SPS gives an LSB size of about 76 µV on a 5 V reference — enough to resolve thermocouple, strain-gauge, or pressure-sensor outputs without external gain. The SAR architecture means no pipeline delay: the conversion result for a given sample is available on the next SPI transaction, which simplifies real-time control loops.
Differential or single-ended — 4 or 8 channels
The input multiplexer gives you a choice: four differential pairs or eight single-ended inputs. Differential mode rejects common-mode noise on long sensor leads, which matters in factory-floor or motor-drive environments where ground loops are common. Single-ended mode doubles the channel count for monitoring multiple DC voltages or logic-level signals. The on-chip PGA provides selectable gain, letting you match the input range to the sensor output without external resistors.
5 V supply, SPI interface, industrial temperature range
The SPI data interface uses four wires (SCLK, DIN, DOUT, CS) and is compatible with most microcontrollers and DSPs — no parallel bus or address decoding needed. The 24-TSSOP package with 0.173-inch body width fits on compact PCB layouts.
ROHS3 compliant per, so it meets the latest EU restriction directives.