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24bit sensor signal conditioner for high-end sensor modules

28 Jan 2016

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Integrated Device Technology Inc. (IDT) has announced what it describes as an energy-efficient 24bit sensor signal conditioner (SSC) IC aimed at consumer barometric pressure and thermopile sensors. The ZSSC3224 features an integrated 26bit digital signal processor (DSP) for linearisation and calibration functions, and is optimised for high-resolution consumer, industrial, white goods and medical applications, as well as mobile products such as phones and tablets.

Developed at recently acquired Zentrum Mikroelektronik Dresden AG (ZMDI), the ZSSC3224 expands a family of SSCs for high-end sensor modules. Offering both accuracy and high resolution, the sensor interface delivers high-accuracy amplification and a 24bit precision full-featured analogue-to-digital converter (ADC).

ZSSC3224

With a 24bit output signal, the ZSSC3224 is geared 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 disks; and weather forecasting equipment. The device, available in die and wafer form, can also adapt thermopile sensors to enable contactless temperature measurements of objects or human body temperature.

The ZSSC3224 offers features targeting battery-driven, low-power devices, such as 1mA typical overall current consumption, ultra-low 20nA typical sleep mode current, and a 1.68V to 3.6V power supply range. Featuring an intelligent power-save scheme to help ensure the lowest overall current consumption, the device also offers internal filter options for low noise output signals and intelligent alarm and interrupt capabilities. The ZSSC3224 eliminates the need for an external buffer capacitor and it provides a superior power supply rejection ratio (PSRR) of up to 90dB at 2V, making it attractive for applications 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 highly reliable, non-volatile, programmable memory.

Additional features of the ZSSC3224 include: quadratic form factor, optimised for stacked die assembly; operating temperature range of -40°C to 85°C; easy programming via software provided in evaluation kit; accuracy better than ±0.10 per cent full-scale output; internal temperature measurement and signal processing; and fully corrected digital output signal simplifying the system design.

The ZSSC3224 is available in production quantities.




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