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Application note PPEB200, vA February 2015 of 9

ITLA Evaluation Board

Clean Light portfolio – PPEB200 – Application Note

The PPEB200 ITLA evaluation board is a convenient tool to use the Pure Photonics

tunable laser in a lab environment. It provides convenient features that facilitate the

evaluation of the ITLA, saving the user time by providing the following:

1. Mechanical interface: the unit comes with a metal plate onto which an ITLA can be

mounted. The metal plate slides under two clamps to provide heat-sinking to the

base-plate.

2. Electrical interface: the unit comes with a 110V power adapter and converts the

input 16V (from the power supply) to the required -5.2V and +3.3V for the ITLA. In

addition, the digital lines are controlled and displayed (through LEDs) on the board.

3. Communication interface: the ITLA is controlled through a low-voltage RS-232

interface. The evaluation board converts this signal to a high voltage RS-232 signal

that can be connected to the serial port on the PC (or to a USB-serial converter).

Pure Photonics Confidential


1. Contents 1. Contents ................................................................................................................... 2

2. Power Supply Circuitry ............................................................................................. 3

3. ITLA Connector ......................................................................................................... 4

4. Evaluation Board Control and Monitoring Hardware ................................................. 5

Push Button Controls ................................................................................................... 5

Dip Switch Controls ..................................................................................................... 5

LEDs ............................................................................................................................ 5

5. Evaluation Board RF Inputs and Outputs ................................................................. 6

6. Other Evaluation Board Connectors ......................................................................... 7

7. Installation of the ITLA on the Evaluation Board ....................................................... 8

Installing the ITLA ........................................................................................................ 8

Mounting the ITLA to the Evaluation Board ................................................................. 8

Completing the Installation .......................................................................................... 9



2. Power Supply Circuitry The PPEB200 evaluation board can be powered through two separate inputs: a 16V input

from a power adapter (included with the unit) or through banana-plugs powered from

separate voltage sources. The latter configuration allows for monitoring of current draw

and power consumption. The source selection is done with on-board switches.

The different components that are relevant for the power supply are indicated in the below

picture. The DC input jack can be used to input a DC voltage from 8 to 25 volts. This

voltage can be supplied by a standard laptop computer power supply (included). The

specific power supply voltages to run both the evaluation board and the ITLA module are

derived from this single power supply input.

The banana input jacks can be used to input separate DC power supply voltages (jacks

for +3.3V, -5.2V, and ground are provided). The banana jack inputs would typically be

used in a situation where the power dissipation or per-supply current draw needs to be

measured.

The board and module power supply sources are selectable using two switches on the

evaluation board. The board power supply switch (marked “BOARD POWER” on the

board) can be set to either banana (power to the board comes from the banana input

jacks) or DC (power to the board comes from the DC input jack). These switch positions

are also labeled (“DC” and “BAN.”) on the board. The ITLA power supply switch (marked

“ITLA POWER” on the board) sets the power source for the ITLA module itself; this can

be set to select power coming from the evaluation board, or power coming from the

banana jacks. These switch positions are labeled (“BOARD” and “BAN.”) on the board.

The four possible combinations of these two switches are shown in the table above.



3. ITLA Connector The host-side (on the evaluation board) and module-side (on the ITLA module itself)

connectors are used to connect the ITLA to the evaluation board. The ITLA connectors

are shown in below figure. The pinout of the connector is shown in below table.

The host- and module-side ITLA connectors are connected with a flex cable; for details

on installing the ITLA module and the flex cable, please refer to section 6.



4. Evaluation Board Control and Monitoring Hardware

Push Button Controls • Reset button (left): resets the ITLA module by pulling the RST line low

• Module I/O Select button (right): pressing and releasing this button resets the

module communications interface (MS signal on the OIF interface)

Dip Switch Controls The ON position noted on the switch module corresponds to a signal low (note that the

signals are active low).

• Disable (switch position 1): Disables the module’s optical output when switched to

the ON position (connected to the DIS pin, pin 2 on the ITLA module connector).

• Switch position 2 is unused.

• Module I/O select SW enable (switch position 3): enables the module select signal

to be controlled through software.

LEDs • Module I/O Select (top left): on when module select enabled (connected to MS

signal on ITLA connector)

• Heartbeat (top right): pulses when the evaluation board communication link with

the ITLA module is OK (LED will appear dim)

• +3.3V (bottom, second from left): on when +3.3V power supply OK

• -5.2V (bottom, third from left): on when -5.2V power supply OK

• Disable (bottom, third from right): on when laser is disabled (connected to DIS

signal on ITLA connector)

• Reset (bottom, second from right): on when ITLA module in reset (connected to

RST signal on ITLA connector)

• SRQ (bottom, far right): on when service request received from ITLA module

(connected to SRQ signal on ITLA connector)



5. Evaluation Board RF Inputs and Outputs

The evaluation board comes equipped with three BNC connectors as shown above. The

BNC connector on the far left of the picture is an input for TxTRACE; this connector can

be used to input a trace tone to the ITLA.

The other two BNC connectors provide diagnostic outputs for supplier use only.



6. Other Evaluation Board Connectors

Several other connectors are provided on the evaluation board for communication and

control purposes. These connectors are pictured above:

• RS-232 connector: This connector is used to communicate with the ITLA module

using a PC. Pin-out is as follows; Rx (pin 2); Tx (pin 3); GND (pin 5); RTS (pin 7,

tied to module select MS*).

• JTAG connector: This connector is for supplier use only.

• I2C connector: This connector is for supplier use only.

• Service connector: This connector is for supplier use only.



7. Installation of the ITLA on the Evaluation Board

Installing the ITLA To install the ITLA on the metal mounting plate, align the screws of the ITLA with the

holes in the mounting plate (only one correct direction). Start to tighten each screw slightly

and then pull-out the black mounting tabs.

Then gradually tighten each screw in a zig-zag pattern, to prevent that any one mounting

area gets excessive stress (due to lack of freedom of movement). Do not overtighten the

screws (either hand-tighten or apply 1 lb-force torque).

Dependent on the connection cable used, determine if the flex-cable on the ITLA needs

to be removed. If so, apply only upwards force to remove the connector, a small wiggling

movement can help to free up the connector. Avoid shearing forces on the connector.

Please observe the following precautions:

• Optical fibers and connectors should always be handled with care to avoid

breakage and scratched or dirty connector end faces. When the unit is not

mounted on the evaluation board, it should be kept in the clamshell container it

shipped in, with the fiber pigtail loosely coiled inside the container.

• The electrical and optoelectronic circuitry on the evaluation board can be damaged

by inadvertent electrostatic discharges (ESD). Use wrist-straps, grounded work

surfaces, and anti-static techniques when operating these modules.

• The units must be kept in a static-free environment/container when not in use and

when being transported.

Mounting the ITLA to the Evaluation Board

First, slide the tray with the ITLA module under the white holding clamps. Ensure that the

tray slides in straight and without excessive friction. Guide the fiber away from the clamps

to avoid damage.



Connect the provided ITLA connector cable between the connector on the ITLA module

and the connector on the evaluation board.

Completing the Installation Connect power to the evaluation board either through the DC jack, through the banana

jacks, or both, and configure the power supply select switches to the desired configuration

(see section 1 for details on power supply selection/configuration).

Connect an RS-232 cable between the serial port of a PC and the RS-232 port of the

evaluation board.

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