AD9661A

a FEATURES < 2 ns Rise/Fall Times Output Current: 120 mA Single +5 V Power Supply Switching Rate: 200 MHz typ Onboard Light Power Control Loop APPLICATIONS Laser Printers and Copiers GENERAL DESCRIPTION Laser Diode Driver with Light Power Control AD9661A and fall times are 2 ns to complement printer applications that use image enhancing techniques such as pulse width modulation to achieve gray scale and resolution enhancement. Control signals are TTL/CMOS compatible. The driver output provides up to 120 mA of current into an infrared N type laser, and the onboard disable circuit turns off the output driver and returns the light power control loop to a safe state. The AD9661A can also be used in closed-loop applications in which the output power level follows an analog POWER LEVEL voltage input. By optimizing the external hold capacitor and the photo detector, the loop can achieve bandwidths as high as 25 MHz. The AD9661A is offered in a 28-pin plastic SOIC for operation over the commercial temperature range (0°C to +70°C). The AD9661A is a highly integrated driver for laser diode applications such as printers and copiers. The AD9661A gets feedback from an external photo detector and includes an analog feedback loop to allow users to set the power level of the laser, and switch the laser on and off at up to 100 MHz. Output rise FUNCTIONAL BLOCK DIAGRAM DISABLE PULSE PULSE2 CAL TTL TTL DISABLE CIRCUIT *13ns DELAY ON RISING EDGE; 0ns ON FALLING HOLD TTL TTL DELAY * VOL...