AD9561_15 Datasheet, PDF (1/8 Pages) Analog Devices – Pulse Width Modulator

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PulseWidthModulator
AD9561
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
FUNCTIONAL BLOCK DIAGRAM
AD9561
CLOCK
APPLICATIONS
OBSOLETE Laser Printers
Digital Copiers
Color Copiers
RsET
CALIN
6-8ITL
DATA
A
SEMIDEM
LEMfTEM
RElRACE
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.
Additionally, input data setup and hold time are symmetrical at
2 ns each, simplifying interface to the system bus.
Finally, chip design and pinout are optimized to decrease
sensitivity of analog circuits to digital coupling. (See layout
section for detailed recommendations for optimum results.)
Inputs are TTL or CMOS compatible, and outputs are CMOS
Pulse width modulation is a well proven method for controlling
gray scale and resolution enhancement in scanning laser print
compatible. The AD956lJR is packaged in a 28-lead plastic
SOIC. It is rated over the commercial temperature range, O°C
to +70°C.
engines. Modulating pulse width provides the most cost
effective method for continuous tone reproduction and resolu-
tion enhancement in low-to-moderate cost scanning electro-
photographic systems.
The AD9561 uses precision analog circuits to control dot size
so that near-photographic quality images are practical without
the high fi'equency clock signals required by all digital approaches.
The AD9561 has improved features and performance over its
HIGHLIGHTS
1. 60 MHz native printer clock rate.
2. Single +5 V power supply.
3. On-chip Autocalibration.
4. Pulse placement flexibility.
5. High resolution: 256 pulse widths.
predecessor, the AD9560. An improved ramp topology enables
control of pulse width through 100% of the dot clock period as
opposed to 95% for the AD9560. This enables smooth transi-
tion across dot boundaries for line screen applications.
REV.O
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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
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@ Analog Devices, Inc., 1996