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Comparative analysis of the quality between FCom and other competitors’ crystal oscillators

Release time:

2023-11-08 16:49

Test the parameters of other competitors’ 49S/24M 20pF 20ppm, 49S/8M 20pF 20ppm, 49S/16M 20pF 20ppm, 5 pieces each. The specific test data is as follows "Graph 1". The same frequencies of the FCom are randomly selected, and the same nominal parameter test is shown in "Graph 2" below.

It was found that the frequencies of other competitors’ are generally negative. Although the accuracy of other competitors’ products with a nominal ±20ppm meets the standard, it is generally controlled above ±10ppm, and some are as high as ±18ppm, which is already an unqualified product for FCom. The accuracy of FCom products with a nominal ±20ppm is generally controlled within ±10ppm.

At the same time, the DLD2 value of other competitors’ products is too large. The DLD2 value is the difference between the maximum resistance value and the minimum resistance value of the test crystal oscillator during operation. The specific reaction is the change in the resistance value of the crystal oscillator when it resonates with the IC and the power is between 0.01μW and 100μW. If the DLD2 value of a crystal oscillator is too large, the crystal oscillator may stop oscillating during operation. For example, the DLD2 value of one product of other competitors’ has reached 5.7 ohms, indicating that the resistance value of the crystal oscillator is unstable, and the consistency of the product is not enough. The DLD2 value of FCom products are all within 1 ohm, which is more consistent than other competitors’ products.

In addition, the FDLD2 value of other competitors’ crystal oscillators are too large. The FDLD2 value reflects the stability of the frequency output when the crystal oscillator resonates with the IC. The smaller the parameter value, the better. The smaller the value, the more stable the crystal oscillator frequency is. The FDLD2 value of FCom’s crystal oscillators are all set within 2ppm.

The main reasons for the large DLD2 value and FDLD2 are as follows:

Wafer material problems, such as bright spot impurities on the wafer.
The surface treatment of the wafer in the crystal oscillator factory is not pure during the production process.
When the crystal oscillator is sealed and soldered, there must be moisture inside.

Comparing the materials used by the two brands, the FCom's 49S crystal oscillator casing uses a secondary oxidation bright shell, while the other competitors’ 49S crystal oscillator inspection shows that its casing uses a matte process. From a cost point of view, the cost of the bright shell treated with secondary oxidation is slightly higher, but the shelf life is longer. Especially when the crystal oscillator is used in an atmospheric environment, the surface of the crystal oscillator can be kept smooth and does not oxidize for a long time, while the matte shell is easier to oxidize.

It can be seen from the above that FCom's products use purer raw materials for wafers during the production process, and the production process is more advanced to prevent the wafers from being contaminated with moisture during the production process. The consistency of the products is higher than that of other competitors’ products. Moreover, FCom considers product reliability as well as durability. It uses a more durable secondary oxidation process on the product's outer shell to indicate the product's service life.

Key words:

application

Fcom

Automotive Electronics

Fire-fighting

Quartz Crystal

OCXO