Dresden, GermanyZMD AG has developed a 16-bit sensor signal conditioning IC (SSC) for resistive bridge sensors.
Dubbed the ZSSC3017, this device combines high accuracy amplification, 16-bit precision analog-to-digital conversion, and an 18-bit DSP for linearization and calibration functions. Applications include altimeter/barometer systems, data merging with GPS receivers, medical gas and infusion pumps, and robotics.
To ensure high accuracy, the ZSSC3017 features an analog front-end with multiple flexible programming options, including an on-chip temperature sensor and fully differential signal paths. The IC topology uses a second-order charge-balancing ADC, leading to less than ±0.5% (FSO) accuracy error over the full industrial temperature range of -40 to +85°C.
A fully programmable differential gain amplifier works with sensor signal ranges from 12.5-160mV/V. The device can be adapted to different sensor signal ranges and features an internal auto-compensated temperature sensor.
An on-chip 18-bit DSP implements the calibration math and second-order error correction for temperature offset, drift, and non-linearity. All calibration data is stored in on-chip EEPROM, and the system can be re-calibrated in the field.
Performing all of the error correction in the ZSSC3017 allows the device to deliver a fully-corrected digital output signal, which simplifies designing the rest of the system and minimizes the bill of materials as well as system power consumption. Power consumption during sleep mode is below 2 µA at 25°C.
The ZSSC3017 is available as die for wafer bonding or in a TSSOP14 package.
Zentrum Mikroelektronik Dresden AG, www.zmdi.com