AD9561

a FEATURES 60 MHz Pulse Rate 8-Bit Resolution Center, Left or Right Justify Low Power: 700 mW typical Minimum Pulse Width: <5 ns Maximum PW: 100 % Full-scale APPLICATIONS Laser Printers Digital Copiers Color Copiers Pulse Width Modulator AD9561 FUNCTIONAL BLOCK DIAGRAM AD9561 CLOCK RSET CAL IN INTERNAL TIMING RAMP CAL OUT RAMP REF CAL DAC 8-BIT DATA SEM/DEM LEM/TEM RETRACE LL AA TT CC HH DAC OUTPUT LOGIC PWM OUT CAL OUT GENERAL DESCRIPTION The AD9561 is a second generation high speed, digitally programmable pulse width modulator (PWM). Output pulse width is proportional to an 8-bit DATA input value. Two additional control inputs determine if the pulse is placed at the beginning, middle or end of the clock period. Pulse width and placement can be changed every clock cycle up to 60 MHz. Pulse width modulation is a well proven method for controlling gray scale and resolution enhancement in scanning laser print engines. Modulating pulse width provides the most cost effective m...