EVAL-ADN2525-NT_15 Datasheet, PDF (3/8 Pages) Analog Devices – Optical Evaluation Kit for the ADN2525

EVALUATION BOARD HARDWARE
CONNECTORS
The ADN2525 is capable of delivering an 80 mA differential
modulation current and 100 mA bias current. Applying dc
voltages to the ADN2525 BSET and MSET pins sets the bias
and modulation currents. The board is set up so that the
outputs of the ADN2525 are ac-coupled to the TOSA. The
board is fitted with connectors that allow the user to connect
the evaluation board to the test setup. Table 1 describes the
name and function of each connector on the board.
Table 1. Connector Description
Connector Description
J1
Allows the user to apply an external dc voltage
source to control the differential modulation
current provided by the ADN2525.
J2
Allows the user to apply an external dc voltage
source to control the bias current provided by the
ADN2525.
J3
Automatic Laser Shutdown. Allows the user to
enable/disable the bias and modulation current by
applying a low/high logic level (not greater than
VCC).
J4
Power Supply Connector. The board supply
voltage is 3.3 V with respect to GND.
J5
Negative data input. A PECL/CML data signal
should be applied.
J6
Positive Data Input. A PECL/CML data signal
should be applied.
J9
25 Ω Test Transmission Line.
TERMINALS
The evaluation board accommodates the terminal assignment
of the multisource agreement for the 10 Gbps XMD miniature
device (EVAL-ADN2525-OP).
Table 2. XMD MSA TOSA Terminal Function Definition
Terminal Number
Option 1
Option 2
1
PD Cathode
PD Cathode
2
Signal Ground
Signal Ground
3
LD Cathode
LD Cathode
4
LD Anode
LD Anode
5
Signal Ground
Signal Ground
6
Thermistor
NC
EVAL-ADN2525-NT/ADN2525-OP
TOP LAYER
6
5
4
3
2
1
BOTTOM LAYER
Figure 2. Pinout of TOSA Footprint on PCB
(Looking Toward the Edge of the Board Cross Section)
For additional optical eye diagram performance data and for
information on optimizing the performance of the evaluation
board for different TOSAs, contact a local Analog Devices
representative.
JUMPERS
Automatic laser shutdown is configurable, driven either by
voltages generated on the board or by external voltages as
described in Table 3.
Table 3. Jumper Configurations
Jumper
Jumper Setting
Configuration Description
P4
A
Enables the bias and differential
modulation currents.
B
Disables the bias and differential
modulation currents.
Removed
Allows the user to enable/disable the
bias and differential modulation
currents by applying a low/high logic
level to J3 from an external source.
Rev. 0 | Page 3 of 8