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745783_

TXRX_982_R1 Evaluation Board

Micrel 

Micrel

Set-Up and Operation

Follow the step-by-step procedure to set-up the board

safely and properly:

1. Connect the on board DB-25 connector to the

parallel port of a computer.

2. Connect the differential input of the laser

driver to DATA output of the pattern generator.

3. Use a multimode fiber jumper, with

appropriate connectors to connect optical

output of the VCSEL to a VOA (variable

optical attenuator) preset to 0dB attenuation.

4. Connect the output of the VOA to the optical

input of the DCA, power-meter, or optical to

electrical converter.

5. Pre-adjust the power supply to 3.3V and turn it

off. Connect TP3 to VCC (3.3V) and TP5 to

GND, then turn the power supply ON. The

total current drawn from the power supply

should be less than 300mA.

6. Launch the MIC3000/1 software. The

MIC3001 Optical Transceiver Management

IC panel opens with Panels and Help grayed

out and only Utilities can be run.

7. Refer to MIC3000/1 Software User’s Guide for

the detailed settings.

8. On the main window select Utilities to open

the utilities panel, then select SCAN to read

the address of the MIC3001 and GET to read

the manufacturer ID, Device ID, and Die

Revision. If there is a failure in reading one of

these parameters, you cannot proceed further.

If all the parameters are read correctly, close

the Utilities window to return to the main

window where Panels and Help are no longer

grayed out.

9. Select Panels to display the list of setting

panels.

10. All the bits displayed on the panels can be

read and/or modified on the panels or by

accessing the registers directly by selecting

ALL REGISTERS, enter the serial address,

the register address, select GET to read the

content or type a value and select SET NEW

to write. In this procedure the bits are set on

the panels.

11. Select OEM CONFIG 0-2 to open the OEM

configuration registers 0, 1, and 2 windows.

TXRX_982_R1 Evaluation Board

12. In OEM Configuration Register 0 window,

set ENABLE/DISABLE to DISABLE, VMOD

REFERENCE to GND, and temperature

zone to INTERNAL.

13. In OEM Configuration Register 1 window:

a. Set APC OP-AMP TYPE to COMMON

EMITTER.

Note: Set the selection bit to 0, 0 should correspond

to EMITTER FOLLOWER, which should be displayed

on the bottom and COMMON EMITTER on the top.

b. Select the voltage to report in

VINH:VINL.

c. Set Feedback voltage source to 1.22V.

d. Set FEEDBACK BIAS REF and RES

TERMINATION to GND and VBIAS

DRIVE to SOURCE (NPN). Set

INTERNAL FEEDBACK RESISTOR to

an arbitrary value (1.6K for example).

e. Set FEEDBACK BIAS REF and RES

TERMINATION to GND and VBIAS

DRIVE to SOURCE (NPN).

f. Set INTERNAL FEEDBACK

RESISTOR to arbitrary value (1.6K for

example).

14. In OEM Configuration Register 2, the

MIC3001 address and look-up table offset can

be modified. The look-up table covers 128°C.

The temperature range for offset = 0 is 0° to

+127°C.) This range can be shifted down by

2x the value. The offset is set to. If offset = 15,

the temperature range becomes –30° to

+97°C.

15. In OEM Configuration Register 0 window,

set ENABLE/DISABLE to ENABLE.

16. On Panels list select OEM CONFIG 3-4 and

select EXTERNAL CALIBRATION (default

setting), LOS COMPARATOR ENABLE,

SHDN, RXLUT INPUT TEMPERATURE, and

RSOUT. If needed, later set ISTART to a

different value to speed up the APC loop

during laser turn ON after a FAULT

occurrence. Close the window to return to

main window.

17. On Panels list, select External Calibration.

Set all the offsets to 0 and slopes to 1. Set

RX_PWR(1) to 1. These parameters might

need to be changed later to correct the

measured values (calibration). Return to the

main window.

September 2004

3

M9999-092304

hbwhelp@micrel.com or (408) 955-1690

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