AN-630 APPLICATION NOTE One Technology Way P.O. Box 9106 Norwood, MA Tel: 781/ Fax: 781/
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1 APPLICATION NOTE One Technology Way P.O. Box 9106 Norwood, MA Tel: 781/ Fax: 781/ ADN2841 Optical Evaluation Kit By Ferenc Barany, Mark Murphy, and Michael O Flanagan INTRODUCTION This application note describes the ADN2841 laser diode driver Rev. E1 evaluation kit. The evaluation kit is a demonstration board that provides optical evaluation of the ADN2841. This document describes how to configure the board in order to operate the part optically. This application note contains the following information: Board description Quick start for optical operation Description of board settings Component list Schematic of board Board layout information Silkscreen image of board Optical eyes BOARD DESCRIPTION The ADN2841 is a dual-loop 50 Mbps to 2.7 Gbps laser diode driver. To use the board in an optical configuration, a suitable laser diode driver must be soldered onto the board. The monitor photodiode, MPD, current is fed into the ADN2841 to control the average power and extinction ratio. The ADN2841 uses automatic power control, APC, to maintain a constant average power over time and temperature. The ADN2841 uses closed-loop extinction ratio control to allow optimum setting of extinction ratio for every device. This board is configured for lasers in mini- DIL packages only. LEDs for Power Supply, DEGRADE, and FAIL are made available for monitoring purposes. Power to the evaluation circuitry is 5 V only. QUICK START FOR OPTICAL OPERATION To ensure proper operation in the optical configuration, verify the following: 1. Jumpers K3 and K4 are connected to A; Jumpers K2 and K5 are connected to B. 2. If the input data is clocked, it is necessary to enable the clock select pin (CLKSEL). CLKSEL is enabled by connecting K4 to B. If the clock inputs are not used or the input data is not latched, connect K4 to A. 3. The power supply is diode protected to ensure the device is not damaged if a +5 V power supply is accidently connected. The user may connect Jumper K1 (short circuit) and power up the board by applying 5 V to the power input SMA, J3. If Jumper K1 is not connected, the user should make the power supply sufficiently negative to ensure that the DUT supply is 5 V. The actual DUT supply can be measured at the anode of D1. 4. Apply a differential signal, typically 500 mv, to J6 and J7 (DATAN and DATAP). Single-ended operation may result in a degraded eye. 5. If the clock select pin is enabled by K4, apply a differential clock signal, typically 500 mv, to J4 and J5 (CLKN and CLKP). 6. The optical eye and switching characteristics of the ADN2841 may be observed using a digital communications analyzer that has an optical input channel with the required bandwidth. 7. The bias and modulation currents can also be monitored by observing IBMON and IMMON, respectively. IBMON and IMMON are both a 1:100 ratio of I BIAS and IMOD. Both are terminated with resistors and so can be viewed at Test Points T3 and T4 using a voltmeter or oscilloscope. 8. To establish the desired average power and extinction ratio, the user should follow this procedure: a. With the power supply turned off, adjust Potentiometers R20 (ERSET) and R21 (PSET) to approximately 20 k. b. With the evaluation board powered on, reduce the value of Potentiometer R21 to establish the desired average optical power. c. Potentiometer R20 can then be reduced in value to increase the modulation current and therefore increase the extinction ratio. The bias current will decrease as the modulation current increases. The bias and modulation currents can be monitored using IBMON and IMMON. When adjusting the extinction ratio, the user should allow adequate time for the eye to settle. The allowable resistance range at the Power Set Input (PSET), the Extinction Ratio Set Input (ERSET), and the Alarm Set (ASET) is between 1 k and 25 k. Resistors R31 through R33 ensure that the resistance at these nodes never falls below the minimum allowable value. If the node resistances increase above 25 k, the ADN2841 may not operate within its specifications.
2 Table I. Description of Board Settings Component Name Function J3 POWER 5 V Power Input to Board J1 IDTONE IDTONE Input J4 CLKN CLKN Input J5 CLKP CLKP Input J6 DATAP DATAP Input J7 DATAN DATAN Input T1 IMPDMON IMPD Current Mirror Monitor T2 IMPDMON2 MPD2 Current Mirror Monitor T3 IBMON Bias Current Mirror Monitor T4 IMMON Modulation Current Mirror Monitor R19 ASET Potentiometer Adjusts the Bias Threshold Current for DEGRADE and FAIL Alarms R20 ERSET Potentiometer Adjusts the Extinction Ratio R21 PSET Potentiometer Adjusts the MPD Current and Thus the Average Power K1 K1 Jumper to Bypass Supply Protection Diode K2 K2 Jumper for LBWSET K3 K3 Jumper to Exercise ALS K4 K4 Jumper for CLKSEL K5 K5 Jumper for IDTONE 2
3 Table II. Component List Component Quantity Description R19, R20, R k Trim Potentiometers D1 1 Supply Protection Diode (1N4001) D2, D3, D4 3 SMD LEDs C3 C12, C16 C nf Capacitors C F Capacitor C13, C F Capacitors (Loop Bandwidth Setting) Q3, Q4 2 Transistors (SOT-23) C F Capacitor C pf Capacitor R15, R k Resistors R Resistor R Resistor R Resistor R1, R16, R Resistors R6 1 1 k Resistor R31 R Resistors R11, R12, R13, R k Resistors R10, R25, R26*, R27*, R28, R Resistors K1 K5 5 Pin Header Jumper Sockets J1, J3 J7 6 SMA Connectors U1 1 ADN2841 U2* 1 Laser Diode Not supplied by Analog Devices L1, L H Inductors *Components that are not populated. 3
4 AN-630 Figure 1. Schematic of Board 4
5 BOARD LAYOUT Figure 2. PC Component Side Figure 4. PC Ground Plane Figure 3. 5 V Power Plane Figure 5. Solder Side 5
6 Figure 6. Silkscreen Image Figure 7. Unfiltered 2.5 Gbps Optical Eye. Average Power = 3 dbm, Extinction Ratio = 9.5 db. Eye Obtained Using a Mitsubishi FU-445-SDF. Figure 8. Filtered 2.5 Gbps Optical Eye. Average Power = 3 dbm, Extinction Ratio = 9 db. Eye Obtained Using a Mitsubishi FU-445-SDF. 6
7 7
8 2003 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective companies. 8 E /03(0)
AN-631 APPLICATION NOTE One Technology Way P.O. Box 9106 Norwood, MA Tel: 781/ Fax: 781/
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