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19-2903; Rev 0; 7/03
MAX3656 Evaluation Kit
_______________ General Description
The MAX3656 evaluation kit (EV-Kit) is an assembled demonstration board that provides optical and electrical evaluation of the MAX3656 155Mbps to 2.5Gbps laser driver. The optical output of the evaluation board allows connection with coaxial laser packages as well as BIDI packages. The electrical output of the evaluation board is interfaced to an SMP connector that can be connected to a 50 terminated oscilloscope.
_________________________Features
Evaluates: MAX3656

Fully Assembled and Tested Single +3.3V Power-Supply Operation Allows Optical and Electrical Evaluation
______________ Ordering Information
PART MAX3656EVKIT *Exposed Pad TEMP. RANGE -40C to +85C IC PACKAGE 24QFN*
______________________________________ Electrical Evaluation Component List
DESIGNATION QTY C16, C17, C25C28 DESCRIPTION 0.01F 5% ceramic capacitors (0402) Murata GRM36X7R103J016AD 0.1F 10% ceramic capacitors (0402) Murata GRP155R61A104K 10F tantalum capacitor (B CASE) AVX TAJB106K010R LED, green T1 package SMA connectors, tab contact (edge mount) Johnson 142-0701-851 SMP 698 (edge mount) Johnson 131-1701-201 Open Open 1X2 pin headers (0.1in centers) 1X3 pin headers (0.1 in centers) FMMT591A Zetex FMMT491A Zetex 49.9 1% resistor (0402) 3k resistor (0402) 26.7 resistor (0402) DESIGNATION QTY R2, R7, R12, R17, R29, R55, R67, R68, R70, R71, R74, R76, R77 R1, R22, R26 R3, R36, R62R65 R30 R33 R34 R39, R40 R52 R53 R54 R8 R9, R10 TP3, TP5, TP7, TP9, J17, J19 U1 U3 None None None DESCRIPTION
6
13
Open
C5, C6, C8
3
3
C7 D1 J1-J4, J11 J10 J5, J7, J9, J12, J13 JP5 JP6, JP7, JP9, JP11, JP16 JP8, JP10, JP12, JP13, JP15 Q0 Q1 R14 R20, R24 R28, R32
1 1 5 1 5 1 5 5 1 1 1 2 2
50k potentiometers (3296W) BOURNS Digi-Key 3296W-202-ND 0 resistor (0402) 121 resistor (0402) 35.7 resistor (0402) 511 resistor (0402) 100 resistor (0402) 30 resistor (0402) 330 resistor (0402) 4.64k resistor (0402) 4.42k resistor (0402) 22.1 resistor (0402) Test points Digi-Key 5000K-ND MAX3656ETG 24-QFN MAX495 8-SOIC Shunts MAX3656 EV Kit MAX3656 data sheet
6 1 1 1 2 1 1 1 1 2 6 1 1 10 1 1
_________________________________________________________________Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
MAX3656 Evaluation Kit
_________________________________________Optical Evaluation Component List
Evaluates: MAX3656
DESIGNATION QTY
DESCRIPTION 0.01F 5% ceramic capacitors (0402) Murata GRM36X7R103J016AD 0.1F 10% ceramic capacitors (0402) Murata GRP155R61A104K 10F tantalum capacitor (B CASE) AVX TAJB106K010R 10pF ceramic capacitor (0402) LED, green T1 package Open Phone Jack Digi-Key A9036-ND SMA connectors, tab contact (edge mount) Johnson 142-0701-851 1X2 pin headers (0.1in centers) 1X3 pin headers (0.1in centers) Open FMMT491A Zetex 100 resistor (0402) 15 resistor (0402) Open 43 resistor (0402) 10 resistor (0402) 13 resistor (0402) 0 resistor (0402) 511 resistor (0402) 4.7k resistor (0402)
DESIGNATION QTY R61, R119 R59, R79, R90 R82, R120 R88 R91, R92, R94, R95, R97, R98, R100, R101 SB1-SB6 TP1, TP23, TP27, J18, J20 U2 U4 None None None 2 3 2 1 8 6 5 1 1 6 1 1
DESCRIPTION 3k resistor (0402) 50k potentiometers (3296W) BOURNS Digi-Key 3296W-202-ND 1.5k resistor (0402) 4.42k resistor (0402) Open Solder Bridge Test points Digi-Key 5000K-ND MAX3656ETG 24-QFN DS1847 14-TSSOP Shunts MAX3656 EV Kit MAX3656 data sheet
C10-C15, C30
7
C18, C20, C21, C32, C35-C37
7
C19
1
C24* D2 J14 J16 J23-J26
1 1 1 1 4
JP25 JP26, JP28, JP30, JP32, JP33 L1 Q4 R103, R104 R109, R122 R118 R121* R124 R126 R41, R42, R113-R116 R43 R44, R45
1
5 1 1 2 2 1 1 1 1 6 1 2
*These components are part of a compensation network to reduce overshoot and ringing caused by parasitic inductance of the laser. For most lasers the starting values will be R121 = 43 and C24 = 10pF. These values should be experimentally tested to optimize the output waveform.
______________Component Suppliers
SUPPLIER AVX Digi-Key Murata PHONE 803-946-0690 218-681-6674 814-237-1431 FAX 803-626-3123 218-681-3380 814-238-0490
Note: Please indicate that you are using the MAX3656 when ordering from these suppliers.
2 _________________________________________________________________________________________
MAX3656 Evaluation Kit Evaluates: MAX3656
______________ Electrical Quick Start
The MAX3656 EV kit's electrical section comes equipped with APC open loop functionality, but can be configured for APC closed loop operation. 1) 2) 3) 4) 5) Install a shunt on JP15 from center pin to GND. Install a shunt on JP13 from center pin to VCC. Install a shunt on JP8, JP12, and JP10 from the center pin to R20, R24, and R8 respectively. Set R22, R26, and R1 to 50k. Measure their values on TP7, TP9, and TP5 respectively. Connect the differential data signal on J1 and J2 with the common mode for each single ended signal within the MAX3656 data sheet limits. Connect a +3.3V power supply to J17. ground to J19. Configure the MAX3656 in operation in one of two ways. a) b) 8) Connect mode 11) Reduce the resistance on R22 to change the bias current. Change the bias current until the APC loop is operational. The APC loop is operational when the LED, D1, is lit. 12) The bias current is (VCC - Voltage at BIAS+) divided by 30. 13) Connect for burst mode operation by removing the voltage sources on J3 and J4 and removing R67, R68, R70, and R71. Install a 100 resistor on R39. 14) Connect the burst signal on J3 and J4.
________________ Optical Quick Start
1) 2) 3) 4) 5) 6) Install a shunt on JP26 from the center pin to GND. Install a shunt on JP28 from the center pin to VCC. Shunt JP25. Install a shunt on JP33, JP30, and JP32 from the center pin to R120, R119, and R88 respectively. Set R79, R59, and R90 to 50k. Measure their values on TP27, TP23, and TP1 respectively. Connect the differential data signal on J26 and J25 with the common mode for each single ended signal within the MAX3656 data sheet limits. The EV kit is designed to allow connection of a variety of possible laser/monitor diode pin configurations. Connect a TO-header style laser with monitor diode as follows: * Keeping its leads as short as possible, connect the laser diode to two of the three pads on the top (component) side of the PC board. Solder the laser diode cathode to the center pad, and solder the anode to either of the other two pads (they are both connected to VCC). Connect the monitor photodiode to two of the five pads on the bottom (solder) side of the PC board, directly below the laser diode pads. Connect the anode and cathode of the photodiode as shown in figure 1. Connect mode
6) 7)
continuous
Remove R39. Connect a 1k resistor on R70 and a 3k resistor on R71, R67, and R68. Connect a +2.3V power supply on J3. Connect a +1.7V power supply on J4.
Connect J10 (OUT+) to a high-speed 50 oscilloscope, through a DC blocking capacitor. An attenuator might be necessary to meet the oscilloscope requirements, since the voltage at OUT+ may exceed the maximum voltage for the oscilloscope. Reduce the resistance on R26 to change the amplitude of the modulation. The modulation current is the amplitude from the oscilloscope divided by 15, assuming no external attenuation.
7)
APC Open Loop
9) Remove shunts on JP9 and JP6. 10) Connect J11 to a high-speed 50 oscilloscope. Reduce the resistance on R1 to change the amplitude of the bias. The bias current is the amplitude from the oscilloscope divided by 15. 11) Connect for burst mode operation by removing the voltage sources on J3 and J4 and removing R67, R68, R70, and R71. Install a 100 resistor on R39. 12) Connect the burst signal on J3 and J4.
*
8) 9)
Connect +3.3V power supply to J18. ground to J20. Configure the MAX3656 in operation in one of two ways. a) b)
continuous
APC Closed Loop
9) Remove R28 and R30. Install a 0 resistor for R29. 10) Install shunts on JP9, JP6, JP16, and JP7.
Remove R103. Connect a 1k resistor on R101 and a 3k resistor on R100, R92, and R91. Connect a +2.3V power supply on J24. Connect a +1.7V power supply on J23.
_________________________________________________________________________________________
3
MAX3656 Evaluation Kit Evaluates: MAX3656
10) Reduce the resistance on R90 to set the maximum allowable bias current. 11) Reduce the resistance on R79 to achieve the desired average power. The average power can be measured by connecting the output of the laser to an optical power meter. 12) Reduce the resistance on R59 to achieve the desired extinction ratio. The extinction ratio can be measured on an oscilloscope connected to an optical/electrical converter. Laser overshoot and _______________Adjustment ringing can be improved by appropriate selection of R121 and C24. 13) The APC loop is functional when the LED, D2, is lit. 14) Connect for burst mode operation by removing the voltage sources on J24 and J23 and removing R91, R92, R100, and R101. Install a 100 resistor on R103 15) Connect the burst signal on J24 and J23.
and Control Descriptions (see Quick Start first)
COMPONENT NAME OPTICAL D2 JP25 JP26 JP28 ----------JP33 JP30 JP32 ELECTRICAL D1 JP16 JP15 JP13 JP7 JP6, JP9 JP8 JP12 JP10 ------FAIL --EN LONGB ----------------When lit the APC loop is tracking the average power and FAIL is high. When not lit the APC loop is not tracking the average power and FAIL is low. Shunting drives the base of a transistor to swtich LED on and off based on the TTL output of FAIL. When connected to VCC disables the MAX3656. When connected to GND enables the MAX3656. Connect the center pin to VCC or GND to set the LONGB pin. Shunting this jumper sets IMD/IBIAS = 1/11. Leaving this jumper open sets IMD/IBIAS = 3/497. Shunting these jumpers, removing R28 and R30, and installing a 0 resistor on R29 allows closed loop opertion. Allows connecting the APCSET pin to either the resistor, R20, or to a fixed, uninstalled resistor R17. Allows connecting the MODSET pin to either the resistor, R24, or to a fixed, uninstalled resistor R7. Allows connecting the BIASMAX pin to either the resistor, R8, or to a fixed, uninstalled resistor R12. Allows conneting the APCSET pin to either the DS1847 or the resistor R120. Allows connecting the MODSET pin to either the DS1847 or the resistor R119. Allows connecting the BIASMAX pin to either the resistor, R88, or to a fixed, uninstalled resistor R118. FUNCTION
4 _________________________________________________________________________________________
MAX3656 Evaluation Kit Evaluates: MAX3656
R76, R77, R2, R74, R67, R68, R70, R71 --R22 R26 R1 Allows for external DC biasing for PECL termination on the MAX3656 inputs. Remove R40 and R39 when connecting the resistors. Allows for external DC biasing for PECL termination on the MAX3656 inputs. Remove R104 and R103 when connecting the resistors. Adjusts the current going into APCSET, which is used to set the average power when APC loop is closed. Adjusts the current going into MODSET, which is used to set the modulation current amplitude. Adjusts the current going into BIASMAX, which is used to set the maximum bias current with closed APC loop and the bias current with open APC loop.
--R94, R95, R98, R97, R101, R100, R92, R91 R79 R59 R90
-----------
_________________________________________________________________________________________
5
MAX3656 Evaluation Kit
Evaluates: MAX3656
C ON F I GU R ATI ON CONFIGURATION11
TOP OF PC BOAR D R124 V CC VC C
C ON F I GU R ATI ON CONFIGURATION22
TOP OF PC BOAR D R124 VC C V CC
LD
T0 -4 6 C AN L ASER /PH OTOD IOD E PAIR
LD
T0 -4 6 C AN L ASER /PH OTOD IOD E PAIR
PD
PD
SOL D ER BR ID GES
VC C
VC C
SOL D ER BR ID GES TO MD
VC C
VC C
TO MD
BOTTOM OF PC BOAR D
BOTTOM OF PC BOAR D
CONFIGURATION33 C ON F I GU R ATI ON
TOP OF PC BOAR D R124 V CC V CC
CONFIGURATION 4 C ON F I GU R ATI ON 4
TOP OF PC BOAR D R124 V CC VC C
LD
T0 -4 6 C AN L ASER /PH OTOD IOD E PAIR
LD
T0 -4 6 C AN L ASER /PH OTOD IOD E PAIR
PD
PD
SOL D ER BR ID GES
VC C
VC C
SOL D ER BR ID GES TO MD
VC C
VC C
TO MD
BOTTOM OF PC BOAR D
BOTTOM OF PC BOAR D
Figure 1. Attachment of Laser Diode/Monitor Diode to the MAX3656 EV kit
6 _________________________________________________________________________________________
MAX3656 Evaluation Kit Evaluates: MAX3656
R17 OP E N
R22 50k R20 3k
R7 OP E N J P 11 TP 5
R26 50k TP 9 R24 3k
R12 OP E N
R1 50k TP 5 R8 4.42k
JP8
J P 12
J P 10 R54 4.64k J9 OP E N JP5 R53 OP E N V C C 330 Q0 JP6 V CC 7 6 4 V CC C16 0.01 F C17 V 0.01 F C C 19 MD GND V CC V C C 18 17 R14 49.9 J 10 JP9 V CC R28 26.7 R32 26.7 R33 35.7 V CC C28 0.01F R29 OP E N R30 121 J 11 R9 22.1 R10 22.1 C25 0.01 F TP 3
U3 2
V CC R52 30 3
JP7
R55 OP E N
M A X 495
24 A P CS E T V CC V CC J1 R62 0 R76 OP E N R77 R40 OP E N 100 V CC J2 V CC J3 R63 0 R70 OP E N R71 OP E N V CC J4 R65 0 R67 OP E N R68 OP E N R39 100 R64 0 R2 OP E N R74 OP E N R36 0
23 MODS E T
22 B IA S MA X
21 V CC
20
1
V CC
2
IN+
OUT-
3 INV C26 C C 4 V CC 0.01 F 5 B E N+
U1
OUT+
16
M AX3656
V C C 15 14
B IA S +
6
V CC 7 J P 15 J 13 OP E N
EN
8
9 C27 0.01 F V CC D1
10 V CC
11
12 R3 0
LONGB
B E NGND GND FA IL V CC
B IA S -
13
V CC J P 13
J 12 OP E N
V CC J 17 J 19 C8 0.1 F C7 C6 10F 0.1 F +
Q1 R34 511
J P 16
C5 0.1 F
J5 OP E N
J7 OP E N
Figure 2. MAX3656 EV Kit Schematic-Electrical Configuration
_________________________________________________________________________________________
7
MAX3656 Evaluation Kit
J 16 A M P P HONE 6 6 5 4 3 2 1
V CC2
Evaluates: MAX3656
R44 4.7k
R45 4.7k
U4
1 2 3 4 R42 0 5 6 7 14 13
V CC2
C30 0.01 F
D S1847
12 11 10 9 8 R82 1.5k R79 50k R120 1.5k TP 27 R61 3k R59 50k TP 23 R119 3k R118 OP E N R90 50k TP 1 R88 4.42k
TS S OP 14
J P 33
J P 30
J P 32
V CC 2 C12 0.01 F 24 A P CS E T V CC2 V CC 2 J 26 R94 OP E N R95 R115 OP E N R104 0 100 V CC 2 J 25 V C C2 J 24 R114 0 R101 OP E N R100 OP E N R103 100 R116 0 R98 OP E N R97 OP E N R41 0 23 MODS E T 22 B IA S MA X 21 VCC 20 MD 19 GND
C10 V 0.01 F C C 2 SB1 SB2 C37 0.1 F SB3 V CC2
V CC2 V CC 18 R109 15 C11 0.01 F
SB6 SB5
1
V CC
C36 0.1F
SB4
2
IN+
OUT-
17 R124 10 R121 43 C24 10pF R126 13 C32 0.1 F C35 0.1 F
3
U2
INOUT+
16
V C15 C C 2 4 V CC 0.01 F 5 B E N+
M AX3656
V C C 15 14 R122 15
B IA S +
6
V CC2 C13 0.01F L1 OP E N
V C C2 R113 J 23 0 R92 OP E N R91 OP E N
V CC2 7 J P 26
EN
8
9 C14 0.01 F
10 V CC2
11
12 V CC2 J P 28
J 14 OP E N
V CC2 D2 J P 25
V C C2 J 18 J 20 C18 0.1 F C19 C20 10 F 0.1F +
Q4 R43 511
C21 0.1 F
Figure 3. MAX3656 EV Kit Schematic-Optical Configuration
8 _________________________________________________________________________________________
LONGB
B E NFA IL GND GND V CC
B IA S -
13
MAX3656 Evaluation Kit Evaluates: MAX3656
Figure 4. MAX3656 Component Placement Guide-Component Side
Figure 5. MAX3656 Component Placement Guide-Solder Side
_________________________________________________________________________________________
9
MAX3656 Evaluation Kit
Evaluates: MAX3656
Figure 6. MAX3656 PC Board Layout-Component Side
Figure 7. MAX3656 PC Board Layout-Ground Plane
10 _________________________________________________________________________________________
MAX3656 Evaluation Kit Evaluates: MAX3656
Figure 8. MAX3656 PC Board Layout-Power Plane
Figure 9. MAX3656 PC Board Layout-Solder Side
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ______________ 11
2003 Maxim Integrated Products Printed USA
_________________________________________________________________________________________
__ 11
is a registered trademark of Maxim Integrated Products.

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