Part Number : AD5820
Function : Evaluation System QuickStart Guide
Manufacturers : Analog Devices
Image and Pinouts :
The AD5820 is designed to drive both spring preloaded and nonspring linear motors used in applications such as lens autofocus, image stabilization, or optical zoom. The operation principle of the spring-preloaded motor is that the lensposition is controlled by the balancing of a voice coil and spring.
The requirement to reduce optical module form factors has led to a reduction in the size
of VCM actuators. As VCM actuators reduce in size, the preloaded balance spring strength also reduces. When large current transitions occur, the momentum of the lens can often lead to overshoot and VCM can take some time to settle to its final position. This phenomenon, often described as mechanical ringing, varies with output current step size and for large lens displacements can lead to unacceptably long auto focus times
Other data sheets within the file : AD-5820