AA-25.000MANK-T

Series:	AA
Packaging:	Tape & Reel (TR)
Part Status:	Active
Type:	MHz Crystal
Frequency:	25MHz
Frequency Stability:	±50ppm
Frequency Tolerance:	±30ppm
Load Capacitance:	20pF
ESR (Equivalent Series Resistance):	50 Ohms
Operating Mode:	Fundamental
Operating Temperature:	-40°C ~ 125°C
Ratings:	AEC-Q200
Mounting Type:	Surface Mount
Package / Case:	2-SMD, No Lead
Size / Dimension:	0.197" L x 0.126" W (5.00mm x 3.20mm)
Height - Seated (Max):	0.053" (1.35mm)

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AA-25.000MANK-T Crystals Application and Working Principle

AA-25.000MANK-T crystals, also known as temperature compensated crystal oscillators (TCXO), are made using a piezoelectric material– usually quartz; the quartz is cut into two plates that are mechanically in contact, electrically isolated, and connected together. This arrangement, referred to as a “piezoelectric coupling,” generates a thermal couple to sense temperature changes and a voltage over the plates causes the quartz to vibrate, thus producing a constant oscillation frequency. AA-25.000MANK-T crystals have been used for many years in various applications due to their unique properties. Their low power consumption and small form factor makes them ideal for applications where power savings is paramount. They are also extremely accurate and have a temperature stability that is difficult to match with other technologies. Their operating temperature range is also much wider than other techniques, and they are capable of withstanding harsh environments. AA-25.000MANK-T crystals are primarily used in devices such as wristwatches and other portables, where accuracy and power savings are important. They are also used in a variety of other less obvious applications where control of timing and precision is paramount. These include cellular telephones, GSM and GPS units, switch mode power supplies, automatic test equipment, jet engine starters, and for various other monitoring, timing and control applications.When an applied electric field is present across the AA-25.000MANK-T crystal plate, the quartz plate begins to vibrate. This vibrational energy is then picked up by an electromagnetic transducer to produce an electrical signal, which is then amplified and combined with a feedback network. This network is used to control the oscillator circuit and maintain precision over a wide temperature range. The ultimate frequency stability of an AA-25.000MANK-T crystal is a result of the combined effects of the thermal couple, the feedback network and the quartz tuning device. The thermal couple ensures excellent stability over a wide temperature range, while the feedback network is required to maintain a precise oscillator amplitude. The quartz tuning device is chosen to achieve the ideal frequency tolerance necessary for the device. In addition to these components, the AA-25.000MANK-T also contains a circuit to compensate for aging and environmental factors. Aging is addressed by calibrating the crystal at various temperatures over a period of time. The environmental factors are compensated for by monitoring the temperature and adding or subtracting current from the appropriate nodes. External components within the AA-25.000MANK-T crystal circuit must be chosen that match the tuning goals of the device. Different components will alter the frequency tolerance, phase noise, and jitter. The choice of components often involves compromise between the various desired performance characteristics. The operation of an AA-25.000MANK-T crystal type oscillator is similar to other types of crystal oscillators. The crystal\'s frequency determines the period of the waveform produced by the oscillator, and the waveform is modified by buffers and other electronic components. The frequency is adjusted by connecting the appropriate tuning devices to the appropriate nodes in the circuit diagram. AA-25.000MANK-T crystals offer superior performance in terms of stability, accuracy and temperature coefficient, making them ideal for a wide range of applications. Their miniature size, low power consumption, wide temperature range and long-term stability make them the ideal choice for any application where precise timing is required. With the addition of a modern temperature compensation circuit, they are capable of providing superior performance and ensuring consistent results in the most demanding environments.

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