16-bit precision sensor signal conditioner, with on-chip DSP

September 24, 2015 // By Graham Prophet
ZMDI’s ZSSC3036 is an energy-efficient, high-precision 16-bit sensor signal conditioner providing high accuracy amplification and high resolution output

ZMDI (Dresden, Germany) adds the ZSSC3036, a 16-bit sensor signal conditioning IC (SSC) with an integrated 18-bit digital signal processor (DSP) for linearisation and calibration functions. ZMDI developed the ZSSC3036 as part of its family of 16-bit SSC ICs for calibrated resistive sensor modules.

For high-resolution industrial, consumer, and medical applications, this sensor interface IC combines 18-bit DSP, high accuracy amplification, and 16-bit precision analogue-to-digital conversion with special features for battery-driven low-power devices, including 900 µA typical overall current consumption, ultra-low 50 nA typical sleep mode current , and a 1.8 to 3.6V power supply range. It features an intelligent power-save scheme to ensure lowest overall current consumption and an internal sensor supply regulator with an excellent power supply rejection ratio (PSRR), eliminating the need for an external buffer capacitor, suiting it to uses in harsh environments.

Digital compensation of signal offset, sensitivity, temperature and non-linearity is accomplished via an internal correction algorithm with coefficients stored on-chip in a reliable, nonvolatile, multiple-time programmable memory. Programming is simple via the ZSSC3036’s serial interface with the PC-controlled calibration software provided in ZMDI’s Development Kit. The measured and corrected bridge values are provided at the digital output pins as I ²C or SPI. The ZSSC3036 can also provide a corrected temperature output measured with an internal sensor.

With an almost noise-free 16-bit output signal, the ZSSC3036 allows designs for high precision measurement systems, including barometric altitude measurement for portable navigation or emergency call systems, altitude measurement for car navigation, pressure measurements inside hard discs, and weather forecasting equipment. High-precision medical applications include medical gas control, medical infusion pumps, ambulatory non-invasive pump systems, and occlusion detection systems.

Features include;

Wide operating temperature range:-40°C to 110°C

Accuracy better than ±0.10% full-scale output

Broad power supply range: 1.8 to 3.6 V

Low overall current consumption: 900 µA typical

Sleep mode current: 50 nA typical

Noise-free 16-bit output signal

Internal temperature measurement and signal processing