DDMA78SDA197

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IR Sensors or Infrared (IR) Sensors measure infrared radiation and convert it into an electrical signal. The DDMA78SDA197 is a model of such an IR Sensor and it is typically used in applications such as non-contact temperature measurement, proximity sensing, and flame detection among others.

Applications

The DDMA78SDA197 is designed for detecting non-contact temperature measurements of objects like hot surfaces, vessels and pipes. According to the product specification sheet, it covers an infrared temperature range between 0 to 400°C (32-752°F). It is also organized into a single-package chip with lead frame package. Hence it helps to save space on a printed circuit board and can be used on small devices where the space available is limited.

Using the same chip, the device is also effective in proximity sensing applications. An example would be when it is used in automatic motion detection of a door. In such applications, the DDMA78SDA197 helps detect an individual or object near the door opening without the event being triggered by light or other objects. The chip can also be used for flame detection applications. It is designed in such a way that it is able to detect the wavelength regions of the light emitted by a fire flame in the midnight.

Working Principle

The DDMA78SDA197 is based on an ‘uncooled microbolometer’. This means that it does not require a cooling element to operate, and can be powered using a standard voltage of 3.3V. The chip works by sensing the incoming infrared radiation and converting it into an electrical signal. By using a digital amplifier, this signal is then converted to a digital output.

This chip uses an infrared measuring technique known as ‘black body radiating’ to detect radiation emitted by an object. It is designed to detect the level of infrared radiation emitted by objects within a specific temperature range. When infrared radiation within the given temperature range is detected by the chip, an electrical signal is produced which can be amplitude modulated, allowing for precise measurements.

The main components of the chip are a CMOS digital amplifier, an Adjustable Low Frequency Oscillator (ALFO) and an Analog To Digital Converter (ADC). The CMOS digital amplifier helps to amplify and output signals that are generated by the incoming infrared radiation. The ALFO is designed to control the frequency of the digital amplifier’s output signals. The ADC is used to convert the output of the digital amplifier into digital signals that can be processed by a computer.

The DDMA78SDA197 is designed to be simple and precise. Its small form factor and low power consumption makes it an ideal choice for a wide range of applications from temperature measurement to proximity sensing and flame detection.

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