Low-power, fast proximity detectors
5 March 2008
Switches, Relays & Keypads
Detecting proximity with capacitance sensors is no easy task. Most applications focus on a particular performance requirement - power, for example. However, speed and sensitivity are also very important as they have a large bearing on the detection response time and the detection distance, respectively. In most cases, compromise cannot be tolerated on either of these three important specifications. Unfortunately, many solutions on the market focus on one of these three important requirements, but fail to deliver performance on the other two requirements. By using Analog Devices' state-of-the-art Σ-Δ ADC architectures, the AD7150 and AD7151 are said to detect proximity without compromising power, sensitivity or speed. Ultralow current consumption of 70 μA is delivered with a sensitivity of 1 fF and a detection speed of 10 ms. The devices also feature an on-chip adaptive environmental algorithm, which automatically compensates for drifts in the capacitance sensor due to temperature, humidity, dust and dirt.
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