552AH000452DG

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Pin configurable/selectable oscillators are widely employed in electronic devices, with varying form and functionality depending on internal components and the specific electronic application. The 552AH000452DG oscillator, manufactured by TE Connectivity, is a representative example of this technology. This miniature, surface-mountable device combines a quartz oscillator, an integrated circuit (IC) for frequency selection, and a high-temperature ceramic or plastic package. As a chip-scale package (CSP), the oscillator is particularly suited for using in consumer and automotive applications.

The 552AH000452DG oscillator has a 3-pin layout. The two outer pins (one of which is the ground pin) are for power supply and the center pin is for the oscillator output. Internally, the oscillator is composed of two parts which are necessary in order to generate accurate frequency output - a crystal oscillator and a frequency selection IC.

The crystal oscillator is an accurate frequency-generation mechanism, producing a precise and stable frequency regardless of the operating temperature range, applied voltage changes, or sudden supply voltage fluctuations. It produces a DC bias current which is then used to drive the crystal and provides an excitation pulse, modulating the quartz crystal so that it produces an output sinusoidal oscillator signal.

The frequency selection IC is the other essential component in the oscillator, allowing the choice of an exact frequency output. It integrates an inverter, a Schmitt trigger, control logic, and a digital-to-analog converter (DAC). This IC allows the oscillator to be set to either a natural or synthetic frequency value, determined by the applied voltage to the OSCON (oscillator control) pin.

In a 552AH000452D 16MHz oscillator, when the OSCON pin is given a Vcc voltage level, the crystal frequency is set to 15.9927MHz and when the OSCON pin is given a GND voltage level, the crystal frequency is set to 16.0004MHz. This feature is called “Pin Selectability”, because it allows the user to select the output frequency of the oscillator by changing the level at the OSCON pin.

In summary, the 552AH000452DG oscillator is a miniature, pin-selectable, highly-accurate surface-mountable device, suitable for a variety of consumer and automotive electronic applications. The combination of a quartz crystal oscillator and a frequency selection IC creates a robust and reliable frequency source with excellent phase noise and frequency stability. Moreover, the small size of the device makes it well-suited for applications where miniaturization is a priority.

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