CS209A DIP8 Auto Metal Proximity Switch IC
The CS209A is a bipolar monolithic integrated circuit for use in metal detection/proximity sensing applications. The IC (see block diagram) contains two on-chip current regulators, an oscillator and low-level feedback circuitry, a peak detection/demodulation circuit, a comparator, and two complementary output stages.
The CS209A is a bipolar monolithic integrated circuit for use in metal detection/proximity sensing applications. The IC (see block diagram) contains two on-chip current regulators, an oscillator and low-level feedback circuitry, a peak detection/demodulation circuit, a comparator, and two complementary output stages.
The oscillator, along with an external LC network, provides controlled oscillations where the amplitude is highly dependent on the Q of the LC tank. During low Q conditions, a variable low-level feedback circuit provides the drive to maintain oscillation. The peak demodulator senses the negative portion of the oscillator envelope and provides a demodulated waveform as input to the comparator. The comparator sets the states of the complementary outputs by com-
paring the input from the demodulator to an internal reference. External loads are required for the output pins.
A transient suppression circuit is included to absorb negative transients at the tank circuit terminal.
Features:-
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Separate Current Regulator for Oscillator.
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Negative Transient Suppression.
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Variable Low-Level Feedback.
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Improved Performance over Temperature.
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6mA Supply Current Consumption at VCC= 12V.
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Output Current Sink Capability 20mA at 4VCC 100mA at 24VCC.
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