In this Quartz Resonators series video, we’ll discuss Drive level Dependency.
After a period of inactivity (hours to weeks), a crystal’s series resistance can rise well above its maximum specified value, becoming a function of the ac electrical drive level. This effect is known as drive-level dependency or “sleepy crystals.”
DLD is thought to be caused by additional mechanical losses from contamination within the crystal package. The contamination can be solid particulate or moisture, most often it’s water that condenses or freezes on the crystal. Once vibration removes the contamination, normal series resistance returns. The contamination might not settle again (or at least not to the same degree), resulting in erratic and unpredictable changes in series resistance.
Irreversible DLD can occur when a particle becomes permanently stuck to the crystal, the electrode plating cracks, or the crystal is scratched. No crystal is completely free of DLD, however higher quality products tend to exhibit much lower DLD. This encompasses series resistance increases and the percentage of units exhibiting resistance changes.
To reduce problems associated with DLD, you could operate with a larger negative resistance than the manufacturer suggests. You could also purchase your Crystals from a reputable source, like ECS Inc. International. This will eliminate Drive Level Dependency and all other manufacturing related issues that might cause problems for your design.
Watch the above video to learn more about Drive Level Dependency (DLD) then click on the button below to start searching for the exact part you need!
Crystals
Oscillators
Power Inductors
ECSpressCON
Please contact us if you need additional information or have a specific requirement in your application.
ECS, Inc. International
15351 West 109th Street
Lenexa, KS 66219
Tel: 913-782-7787
Toll Free: 1-800-237-1041
Fax: 913-782-6991
Drive Level Dependency (DLD) was last modified: June 30th, 2022 by