AD9661AKR Analog Devices Inc, AD9661AKR Datasheet

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AD9661AKR

Manufacturer Part Number
AD9661AKR
Description
IC LASER DIODE DRIVER 28-SOIC
Manufacturer
Analog Devices Inc
Type
Laser Diode Driverr
Datasheet

Specifications of AD9661AKR

Rohs Status
RoHS non-compliant
Number Of Channels
1
Voltage - Supply
4.75 V ~ 5.25 V
Current - Supply
75mA
Operating Temperature
0°C ~ 70°C
Package / Case
28-SOIC (0.300", 7.50mm Width)
Mounting Type
Surface Mount

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a
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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.
GENERAL DESCRIPTION
The AD9661A is a highly integrated driver for laser diode appli-
cations such as printers and copiers. The AD9661A gets feed-
back 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
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
8
C
DAC
GAIN
SHIFT OUT
POWER
R
LEVEL
LEVEL
MONITOR
GAIN
DISABLE
POWER
PULSE2
SHIFT IN
PULSE
LEVEL
GAIN
CAL
TTL
TTL
ANALOG
TTL
TTL
ANALOG
V
0–1.6V
LEVEL SHIFT IN
CIRCUIT
LEVEL
SHIFT
+ V
FUNCTIONAL BLOCK DIAGRAM
REF
DISABLE
CIRCUIT
DELAY
50
*
5pF
*13ns DELAY ON RISING
EDGE; 0ns ON FALLING
REF
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
and fall times are 2 ns to complement printer applications that
use image enhancing techniques such as pulse width modula-
tion 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).
V1
V
AD9661A
REF
I
MONITOR
with Light Power Control
1:10
1:1
VOLT
REF
3–120mA
I
MONITOR
I
OUT
Laser Diode Driver
OUTPUT
V
SENSE IN
1.0V
HOLD
LASER
DIODE
REF
+5V
© Analog Devices, Inc., 1995
AD9661A
PHOTO
DETECTOR
Fax: 617/326-8703

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AD9661AKR Summary of contents

Page 1

FEATURES < 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 The AD9661A is a highly integrated driver ...

Page 2

... Disable Time is measured from the 50% point of the rising edge of DISABLE to the 50% point of the falling transition of the output current. Fall time during disable is similar to fall time during normal operation. 8 PULSE, PULSE2, DISABLE, and CAL are TTL/CMOS compatible inputs. Specifications subject to change without notice. (+ Temperature = +25 C unless otherwise noted) S Test AD9661AKR Level Temp Min Typ Max IV Full ...

Page 3

... S POWER LEVEL, LEVEL SHIFT TTL/CMOS INPUTS . . . . . . . . . . . . . . . . . . . . –0 Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 mA Operating Temperature AD9661AKR . . . . . . . . . . . . . . . . . . . . . . . . . +70 C Storage Temperature . . . . . . . . . . . . . . . . . . – +150 C Maximum Junction Temperature . . . . . . . . . . . . . . . . . +150 C Lead Soldering Temp (10 sec +300 C *Absolute maximum ratings are limiting values applied individually, and beyond which the serviceability of the circuit may be impaired. Functional operability under any of these conditions is not necessarily implied ...

Page 4

... GAIN and POWER MONITOR. See text for choosing . MONITOR connections should be tied together externally. S LEVEL SHIFT OUT PIN ASSIGNMENTS PULSE2 1 DNC REF LEVEL SHIFT IN 4 GAIN 5 POWER MONITOR 6 AD9661AKR SENSE INPUT 7 (Not to Scale) GROUND GROUND HOLD 11 POWER LEVEL 12 LEVEL SHIFT OUT 13 14 DISABLE –4– ...

Page 5

THEORY OF OPERATION The AD9661A combines a very fast output current switch with an onboard analog light power control loop to provide the user with a complete laser diode driver solution. The block diagram illustrates the key internal functions. The ...

Page 6

AD9661A The laser diode’s output power will then vary from for an input range +1 the POWER REF REF LEVEL input. Minimum specifications for I MONITOR MAX choosing R . Users ...

Page 7

TIME CONSTANTS – Figure 4. Calibration Time Initial calibration is required after power-up or any other time the laser has been disabled. Disabling the AD9661A drives ...

Page 8

AD9661A Minimizing the Impedance of the Output Current Path Because of the very high current slew that the AD9661A is capable of producing (120 1.5 ns), the inductance of the output current path to and from the laser ...

Page 9

Choosing a hold caps based on this –9 0 HOLD 266.6 A • The initial calibration time for < 0.1% error 550 0.034 F • Recalibration for a 0.1% error after ...

Page 10

AD9661A–Typical Performance Characteristics 180 160 140 120 100 1.7 2 2.3 2.6 2.9 3.2 V – V HOLD Figure 8. Typical AD9661A V/I Transfer Function 4.2 3.5 3.8 4.1 4.4 2pF LOW ...

Page 11

AD9661A EVALUATION BOARD The AD9661A Evaluation Board is comprised of two printed circuit boards. The Laser Diode Driver (LDD) Resource Board is both a digital pattern generator and an analog reference gen- erator (see LDD Resource Board Block Diagram.) The ...

Page 12

AD9661A 28 0.300 (7.60) 0.292 (7.40) 1 PIN 1 0.012 (0.30) 0.004 (0.10) OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 28-Pin Plastic SOIC (R-28) 0.712 (18.08) 0.700 (17.78) 15 0.419 (10.64) 0.393 (9.98) 14 0.104 (2.64) 0.093 (2.36) 0.0500 ...

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