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Atmel DVD chipset occupies smaller footprint

Posted: 12 Aug 2002 ?? ?Print Version ?Bookmark and Share

Keywords:atmel? dvd chipset? cd chipset? at78c1501? at78c1502?

Atmel Corp. has announced the release of a fully functional DVD chipset with embedded microcontrollers that reduce the number of components and required board space, and supports all of the current DVD and CD writeable and rewriteable standards.

The chipset combines the AT78C1501 interface controller, AT78C1502 servo system, AT78C1503 read channel, AT78C1504 laser power controller and its adjunct device the AT78C1507, with an embedded ARM7TDMI and AVR microcontrollers that occupies 5,000mm2 footprint; - lesser than the 20,000mm2 required by traditional solutions.

The chipset has been designed to function as a total system, eliminating the additional "glue" components usually required in traditional designs, to combine components from multiple suppliers. This further reduces design complexity, board space, and power consumption.

The chipset interfaces with Atmel's T08XX series of laser drivers, typically deployed with the laser on the optical pickup unit. The AT78C1501 contains ARM and AVR microcontrollers, buffer management, error correction code, and encoder/decoder for DVD and CD.

Also included is a writeable control store for timing generation and an on-board frequency synthesizer to generate system frequencies from one crystal. ATA66/ATAPI66 and I2S interfaces are also provided.

The AT78C1502 provides the control requirements for DVD and CD mechanisms including programmable control for coarse and fine tracking, focus, sled, draw, motor, and tilt. Three parallel programmable AVR microcontrollers are the heart of the system providing a range of servo sample rates. Real-time notch filters can also be calculated.

AT78C1504 is a pre-programmed automatic device for controlling the write and read pulses to a laser diode power amplifier. All of the present DVD and CD write strategies are provided in the device, along with automatic power and optimum power control.

Though the device is pre-programmed, it is possible through a serial interface to adjust pulse timing, width and amplitude. Five DACs are provided to individually control the Laser Diode Power Amplifier. Packaging for inclusion on the PCBA or on the OPU is available.

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