CMI8804 Datasheet | Capella Microsystems

DESCRIPTION The CMI8804 is a silicon monolithic integrated circuit and is a four channel driver for optical disc motor drivers. The CMI8804 has a wide dynamic range of 4.0V(typ.) at Pre Vcc=12V, PVcc=5V, and RL=8Ω. By separating the into pre+power of sled driver, power of a loading driver, and power of an actuator, the CMI8804 has made the power efficiency better by using low supply voltage. The CMI8804 has integrated and built in to itself a level shift circuit, a thermal-shut-down circuit, and a stand-by mode. The actuator drive is a current feedback type and the current phase lag influenced load inductance is little. On the sled motor driver, input pins consist of (+) and (-), which thus provides various input types, such as the differential input. The loading driver is a single input linear BTL driver. FEATURES - - - - Focus Actuator which controls the height of the pickup to maintain the proper focus. Tracking Actuator which moves the pickup along the closet track. Sled Motor Control which moves the pickup to a track other than the immediate track. Tray Motor Control which opens and closes the tray when inserting or removing the disc. APPLICATIONS - - CD-ROM DRIVES CD DRIVES m et4U.co ee Data Sh . 10K Pre GND PVcc2 10K PGND 15K Stand-by + - 7.5K 20K + - Thermal Shut Down 7.5K x2 Det. Amp Loading Driver Actuator Driver PVcc1 PVcc2 Vcc + - Det. Amp + x2 7.5K 7.5K 10K + - + -...