CS209A Datasheet | onsemi

.. CS209A Proximity Detector The CS209A is a bipolar monolithic integrated circuit for use in metal detection/proximity sensing applications. The IC (see Figure 1) contains two on- chip current regulators, oscillator and low- level feedback circuitry, peak detection/demodulation circuit, a parator and two plementary output stages. The oscillator, along with an external LC network, provides controlled oscillations where amplitude is highly dependent on the Q of the LC tank. During low Q conditions, a variable low- level feedback circuit provides drive to maintain oscillation. The peak demodulator senses the negative portion of the oscillator envelope and provides a...