AD9661A_15 Datasheet, PDF (11/12 Pages) Analog Devices – Laser Diode Driver with Light Power Control

AD9661A
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 board is
controlled by an IBM compatible personal computer through a
standard printer cable. The resource board interfaces to the
AD9661A DUT board, which contains the AD9661A, a level
shift circuit for the analog input, and a socket for an N type
laser diode. A dummy load circuit for the laser diode is in-
cluded for evaluation. Power for all the boards is provided
through the banana jacks on the AD9661A DUT board.
These should be connected to a linear, +5 V power supply.
Schematics for the LDD Resource Board, AD9661A DUT,
and Dummy Load are included, along with a bill of mate-
rial and layout information. Please contact Applications for
additional information.
STANDARD PARALLEL
PRINTER CABLE
E IBM-COMPATIBLE
PC
WITH WINDOWS
PARALLEL
PRINTER PORT
P1
CENTRONICS
CONNECTOR
40MHz
CLOCK
OSCILLATOR
32K x 16
MEMORY
READBACK
LATCH
ADDRESS
COUNTER
AND
RESOURCE
CONTROLLER
DIGITAL PATTERN GENERATOR
T ₈
DAC 1
0–2.55V
X1
E ₈
DAC 2
X1 ^0–2.55V
ANALOG REFERENCE
L _{LASER DIODE DRIVER RESOURCE BOARD}
PULSE
WIDTH
MODULATOR
(AD9560)
OUTPUT
BUFFER
OUTPUT
SMB
CONNECTORS
J4 _{PULSE1 (JPUL)}
J5 _{CAL (JCALB)}
J7
J8
DISABLE (JDIS)
PULSE2 (JPULB)
J6
J2
UNUSED
TRIGGER
J3
INTERFACE TO
AD9661A
EVALUATION
BOARD
12
11 ^{EXTERNAL LEVEL SHIFT CIRCUIT}
AD9661A
R9
R8 ^{LEVEL SHIFT IN}
20-PIN
HEADER
17–20
+5V POWER SUPPLY
1–10
GROUND
Figure 10. LDD Resource Board Block Diagram
O _{INPUT SMB CONNECTORS}
S_{FOR DIGITAL CONTROLS}
5
AD9661A
B20
20-PIN HEADER
FOR ANALOG
O ^CONTROLS
OPTIONAL
LEVEL SHIFT
CIRCUIT
DUMMY LOAD CIRCUIT/
LASER DIODE SOCKET
AD9661A
EVALUATION BOARD
Figure 11. Evaluation Board Block Diagram
REV. 0
–11–