24-bit sigma-delta ADC for precision measurement chains
The Maxim Integrated MAX11200EEE+T is a 24-bit sigma-delta ADC with a single differential input, designed for low-frequency precision measurement applications such as weigh scales, pressure sensors, temperature transducers, and industrial process control loops. Its sigma-delta architecture delivers high resolution at a 480 SPS sampling rate, making it suited for DC and near-DC sensor readout where noise rejection and linearity matter more than speed. The digital interface is SPI, allowing direct connection to most microcontrollers without glue logic. The ADC requires an external voltage reference, giving the designer control over the full-scale range and noise floor based on the system's reference quality. The analog supply runs from 2.7 V to 3.6 V while the digital supply operates from 1.71 V to 3.6 V.
Sampling rate and resolution trade-off for sensor front-ends
At 24 bits and 480 SPS, the sigma-delta modulator oversamples and shapes quantization noise out of band. The differential input architecture rejects common-mode noise from the sensor leads and power supply, which is critical when the ADC is several inches of PCB trace away from the transducer. Single-ended sensors can be accommodated by grounding one input, but the full benefit of the 24-bit dynamic range is realized with a differential source.
Package and footprint notes for layout
The MAX11200EEE+T is offered in a 16-pin SSOP (3.90 mm width) package, with the supplier device package listed as 16-QSOP.