12-bit SAR ADC at 1 Msps — what it means for the signal chain
The Maxim Integrated MAX11328ATJ+ is a 12-bit successive-approximation-register (SAR) ADC that samples at 1 Msps. It accepts differential, pseudo-differential, or single-ended inputs through an internal multiplexer feeding a sample-and-hold stage, all controlled via a SPI or DSP serial interface. The single 2.35 V to 3.6 V supply powers both the analog and digital sections, which simplifies rail planning — no separate AVDD and DVDD regulators needed. An external reference sets the full-scale range, so the designer picks the voltage that matches the sensor or signal conditioner output.
Input flexibility and routing
The input mux supports 8, 15, or 16 channels depending on the configuration — differential pairs, pseudo-differential with a common return, or single-ended. That range covers applications from multi-channel data acquisition on a PLC analog input module to monitoring thermocouple or RTD signals in a temperature controller. The 1:1 S/H-to-ADC ratio means each conversion samples a fresh input; there is no pipeline delay to budget for.
Temperature grade and environment
Rated for -40°C to +125°C, this ADC suits industrial and automotive environments. The 32-TQFN (5x5 mm) package fits space-constrained PCBs.
Lifecycle and sourcing
The MAX11328ATJ+ is listed as Active on Maxim's product status. No last-time-buy or end-of-life notice is in effect, so it remains a safe choice for new designs and production BOMs. ROHS3 compliant.