ZMD announced the ZMD31210 cLite capacitive sensor signal conditioning integrated circuit (IC). The ZMD31210 features 14-bit resolution and 0.5% accuracy over a wide range of capacitances and temperatures. The ZMD31210 draws 60 uA over a supply voltage range as low as 1.8V or as high as 5.5V. The ZMD31210 is begin production in Q4 2009. Samples and kits are available. The devices are available in TSSOP14 packages. Unit prices start at 2.09 EUR, or USD 2.93, in volumes of 1k devices or more.
- Target input capacitance range: 2pF to 260pF
- Programmable sampling rates: 8 to 14 bit; as fast as 0.75ms
- Digital compensation of sensor offset; piece-wise 1st and 2nd order digital compensation of sensor gain
- Digital compensation of 1st and 2nd order temperature gain and offset drift
- Internal temperature compensation reference (no external components)
- Programmable capacitance span and offset
- Layout customized for die-die bonding with sensor for low-cost, high-density chip-on-board assembly
- ±0.25% FSO @ -20 to 85°C, 2.7-5.5V
- ±0.50% FSO @ -40 to 125°C, 2.7-5.5V
- ±1.00% FSO @ -20 to 85°C, 1.8-2.7V
The ZMD31210 can be configured to interface with capacitive sensors from 2 to 260 pF with sensitivity as low as 125 atto-Farads (aF) per digital bit. The part accommodates both single and differential input sensor configurations. All calibration is digital, and completed in one pass; eliminating the cost of laser trimming and speeding production of fully calibrated sensor modules.
More info: ZMD ZMD31210 cLite Capacitive Sensor Signal-Conditioning IC (pdf)