AD9561JR Analog Devices, AD9561JR Datasheet

AD9561JR

Manufacturer Part Number

AD9561JR

Description

7V; 10mA; pulse width modulator. For laser printers, digital copiers, color copiers

Manufacturer

Analog Devices

Datasheet

1.AD9561JR.pdf (8 pages)

Specifications of AD9561JR

Case

SOP

99+

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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 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 frequency clock signals required by all digital approaches.

The AD9561 has improved features and performance over its

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. 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.

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

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

compatible. The AD9561JR is packaged in a 28-lead plastic

SOIC. It is rated over the commercial temperature range, 0 C

to +70 C.

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.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 617/329-4700

Fax: 617/326-8703

RETRACE

SEM/DEM

LEM/TEM

CLOCK

CAL IN

DATA

8-BIT

SET

AD9561

INTERNAL

FUNCTIONAL BLOCK DIAGRAM

TIMING

Pulse Width Modulator

World Wide Web Site: http://www.analog.com

DAC

CAL

OUT

RAMP

REF

DAC

AD9561

OUTPUT

LOGIC

PWM

OUT

CAL

OUT

Related parts for AD9561JR

AD9561JR Summary of contents

Page 1

... Inputs are TTL or CMOS compatible, and outputs are CMOS compatible. The AD9561JR is packaged in a 28-lead plastic SOIC rated over the commercial temperature range +70 C. HIGHLIGHTS 1 ...

... Full +25 C Full 2.0 Full 2.0 Full Full 60 + Full Full Full Full Full Full Full 4.6 Full Full 4.6 Full Full Full Full Full 8 +25 C –2– AD9561JR Typ Max Units Bits 0.5 2 LSB 1.5 4 LSB 0.75 LSB V 0 0 MHz ...

Page 3

... Range Description AD9561JR +70 C 28-Lead SOIC R-28 AD9561JR-REEL +70 C 28-Lead SOIC R-28 *Tape and Reel ordered in multiples of 1000 ICs. CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. ...

Page 4

AD9561 N CLOCK DATA FF, XX CONTROL OUTPUT THEORY OF OPERATION General The AD9561 is a mixed signal IC designed to provide high- speed pulse width modulation in laser printers and copiers. It uses high performance analog circuits to achieve ...

Page 5

Pulse Pattern Example Figure 1 at the top of the previous page illustrates the PWM OUT of the AD9561 with various DATA and CONTROL inputs. The DATA format is Binary. In the Pulse Pattern Example, the Hexadecimal format is used, ...

Page 6

AD9561 This yields the maximum time from the trailing edge of CAL IN to the rising edge of CAL OUT example, the maximum time required for auto-calibration for a system with clock frequency of 20 MHz is 102.4 ...

Page 7

Grounding and Bypassing Because the AD9561 uses analog circuits to achieve its superb gray scale resolution, caution must be exercised when incorpo- rating it into the mostly digital controller card for a printer. Achieving the accuracy designed into the AD9561 ...

Page 8

AD9561 0.0118 (0.30) 0.0040 (0.10) OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 28-Lead SOIC (R-28) 0.7125 (18.10) 0.6969 (17.70 PIN 1 0.1043 (2.65) 0.0926 (2.35) 0.0500 0.0192 (0.49) SEATING 0.0125 (0.32) (1.27) 0.0138 (0.35) PLANE ...

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