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AD9660KR-REEL Datasheet(PDF) 1 Page - Analog Devices |
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AD9660KR-REEL Datasheet(HTML) 1 Page - Analog Devices |
1 / 12 page FUNCTIONAL BLOCK DIAGRAM REV. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a AD9660 FEATURES 1.5 ns Rise/2.0 ns Fall Times Output Current: 180 mA @ 3 V, 200 mA @ 2.5 V Bias Current: 90 mA @ 3 V Modulation Current: 60 mA @ 3 V Offset Current: 30 mA @ 3 V Single +5 V Power Supply Switching Rate: 200 MHz Onboard Light Power Control Loops APPLICATIONS Laser Printers and Copiers Optical Disk Drives FO Datacomm GENERAL DESCRIPTION The AD9660 is a highly integrated driver for laser diode appli- cations such as optical disk drives, printers, and copiers. The AD9660 gets feedback from an external photo detector and in- cludes two analog feedback loops to allow users to set “bias” and “write” (for optical disk drives) power levels of the laser, and switch between the two power levels at up to 200 MHz. Output rise and fall times are typically 1.5 ns and 2.0 ns to complement printer applications that use image enhancing tech- niques such as pulse width modulation to achieve gray scale, and allow disk drive applications to improve density and take advantage of pulsed write formats. Control signals are TTL/ CMOS compatible. © Analog Devices, Inc., 1995 One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703 200 MHz Laser Diode Driver with Light Power Control The driver output provides up to 180 mA of current @ 3 V, 90 mA of BIAS current, 60 mA of modulation current, and 30 mA of offset current. The onboard disable circuit turns off the output drivers and returns the light power control loops to a safe state. The AD9660 can also be used in closed loop applications in which the output power level follows an analog WRITE LEVEL voltage input. By optimizing the external hold capacitor, and the photo detector, the write loop can achieve bandwidths as high as 25 MHz. The AD9660 is offered in a 28-pin plastic SOIC for operation over the commercial temperature range (0 °C to +70°C). TRANSIMPEDANCE AMPLIFIER OUTPUT DRIVER AD9660 LASER DIODE PHOTO DETECTOR DIODE OUTPUT SENSE INPUT WRITE LEVEL BIAS LEVEL BIAS CAL V:1 BIAS T/H V:1 T/H OUTPUT DRIVER WRITE PULSE WRITE CALIBRATE |
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