ON Semiconductor LC898212XA-MH AF Control IC for smartphone camera modules

ON Semiconductor has introduced the LC898212XA-MH, an auto focus (AF) control IC for camera modules in smartphones. The solution is integrated, programmable and provides fast, accurate auto focus convergence while apparently consuming less power and generating less noise interference than competing solutions. The space-saving design has been optimised for thinner and lighter smartphones.

The product features digital logic with a closed-loop control system and a function for a positioning sensor. Its closed-loop architecture provides for accurate auto focus control while also lowering power consumption relative to open-loop solutions.

The function for a positioning sensor is a constant current digital-to-analog converter (DAC) and gain adjustable operational amplifier to ensure accurate sensing. The output of the positioning sensor is read by an integrated 10-bit analog-to-digital converter (ADC).

The control circuit filter coefficients are adjustable via a I2 C interface, allowing the product to be programmed for optimal convergence time when paired with various different actuators.

The device also incorporates an improved pulse width modulation (PWM) drive system to further lower power consumption while also minimising noise which can affect image quality.

The product is housed in a lead-free, halogen-free WL-CSP 12-pin package.