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19-1420; Rev 1; 6/00
MAX3867 Evaluation Kit
General Description
The MAX3867 evaluation kit (EV kit) is an assembled demonstration board that provides optical or electrical evaluation of the MAX3867. The EV kit is composed of two independent sections on the PC board. The output of the electrical evaluation section is interfaced to an SMA connector, which can be connected to a 50 terminated oscilloscope. The output of the optical evaluation section is configured for attachment to a laser/monitor diode. o Fully Assembled and Tested o +3.3V to +5.0V Operation o Input Termination Provided On-Board
Features
Evaluates: MAX3867
Ordering Information
PART MAX3867EVKIT TEMP. RANGE -40C to +85C IC PACKAGE 48 TQFP
Electrical Component List
DESIGNATION QTY C14, C21, C31, C33, C44 C24, C25, C28, C32 C26, C27, C29, C30, C34 C37, C39 C40 C41, C45 C42 C43 D3 5 4 5 2 1 2 1 1 1 DESCRIPTION Do not install. 0.01F 10% ceramic capacitors (0402) 0.1F 10% ceramic capacitors (0603) 0.056F 10% ceramic capacitors (0603) 10F 20% tantalum (16V) capacitor AVX TAJC106M016 0.01F 10% ceramic capacitors (0603) 0.22F 10% ceramic capacitor (0603) 1000pF 10% ceramic capacitor (0402) LED Digi-Key P363-ND SMA edge-mount connectors EFJohnson 142-0701-801 or Digi-Key J502-ND Shunts Digi-Key S9000-ND 2-pin headers (0.1in center) Digi-Key S1012-36-ND 1k ferrite beads (0805) Murata BLM21A102S 1.2H inductor Coilcraft 1008LS-122XKBC 600 ferrite beads (0603) Murata BLM11A601SPT R41 R42 R43, R45 R44 R46 U2 U3 TP2, TP3, TP8, TP10-TP13, VCC1, GND1 TP17, TP18 None None 1 1 2 1 1 1 1 9 2 1 1 DESIGNATION QTY Q2 R5, R22, R47 R23 R25, R26, R30, R31 R28, R29, R32, R33 R34 R37 R38, R49 R40 1 3 1 4 4 1 1 2 1 DESCRIPTION PNP transistor (SOT23) Zetex FMMT591A ("91A" marking) 1.5k 1% resistors (0603) 1k 1% resistor (0603) 84.5 1% resistors (0402) 124 1% resistors (0402) 110 1% resistor (0603) Do not install. 49.9 1% resistors (0402) 100k variable resistor Bournes or Digi-Key 3296W-104-ND 50k variable resistor Bournes or Digi-Key 3296W-503-ND 200k variable resistor Bournes or Digi-Key 3296W-204-ND 0 resistors (0603) 24.9 1% resistor (0402) 15 1% resistor (0603) MAX3867ECM (48-pin TQFP) MAX495ESA Test points Digi-Key 5000K-ND Do not install. MAX3867 data sheet MAX3867 EV kit circuit board (Rev D)
J5-J9
5
JU4, JU5 JU4, JU5 L7, L13 L9 L10, L11
2 2 2 1 2
________________________________________________________________ Maxim Integrated Products
1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.
MAX3867 Evaluation Kit Evaluates: MAX3867
Optical Component List
DESIGNATION QTY C1-C4, C17, C38 C5, C8, C9, C15, C18, C35 C6 C7 C10-C13, C23 C16 C19 C20, C22, C36 D1 6 6 1 1 5 1 1 3 1 DESCRIPTION 0.01F 10% ceramic capacitors (0402) Do not install. 1000pF 10% ceramic capacitor (0402) 0.056F 10% ceramic capacitor (0603) 0.1F 10% ceramic capacitors (0603) 0.22F 10% ceramic capacitor (0805) 10F 20% tantalum (16V) capacitor AVX TAJC106M016 0.01F 10% ceramic capacitors (0603) LED Digi-Key P363-ND SMA edge-mount connectors EFJohnson 142-0701-801 or Digi-Key J502-ND 2-pin headers (0.1in center) Digi-Key S1012-36-ND Shunts Digi-Key S9000-ND 1k ferrite bead (0805) Murata BLM21A102S 600 ferrite bead (0603) Murata BLM11HA601SPT 0 resistor (0603) DESIGNATION QTY L4 L5, L6 R1, R2 R3 R6, R7, R10, R11 R8, R9, R12, R13 R14 R15 R16 R18 R19 R20 R21 R27 R35, R48 R36 TP1, TP4, TP5, TP6, TP14, VCC, GND TP15, TP16 U1 1 2 2 1 4 4 1 1 1 1 1 1 1 1 2 1 7 2 1 DESCRIPTION 1.2H Inductor Coilcraft 1008LS-122XKBC 600 ferrite beads (0603) Murata BLM11A601SPT 1.5k 1% resistors (0603) 1.0k 1% resistor (0603) 84.5 1% resistors (0402) 124 1% resistors (0402) 50k variable resistor Bournes or Digi-Key 3296W-503-ND 200k variable resistor Bournes or Digi-Key 3296W-204-ND 100k variable resistor Bournes or Digi-Key 3296W-104-ND 110 1% resistor (0603) Do not install. 27.4 1% resistor (0402) 49.9 1% resistor (0402) 24.9 1% resistor (0402) 0 resistors (0603) 43.2 1% resistor (0402) Test points Digi-Key 5000K-ND Do not install. MAX3867ECM (48-pin TQFP)
J1-J4
4
JU1, JU2 JU1, JU2 L1 L2 L3
2 2 1 1 1
Component Suppliers
SUPPLIER AVX Coilcraft Digi-Key EFJohnson Murata Zetex PHONE 803-946-0690 847-639-6400 218-681-6674 402-474-4800 814-237-1431 516-543-7100 FAX 803-626-3123 847-639-1469 218-681-3380 402-474-4858 814-238-0490 516-864-7630
Quick Start
Electrical Evaluation
In the electrical configuration, an automatic power control (APC) test circuit is included to emulate a semiconductor laser with a monitor photodiode. Monitor diode (MD) current is provided by Q2, which is controlled by an operational amplifier (U3). The APC test circuit, consisting of U3 and Q2, applies the simulated MD current (the laser bias current divided by 100) to the MD pin of the MAX3867. To ensure proper operation in the electrical configuration, set up the evaluation board as follows: 1) If data is to be latched, remove the shunt from JU4 to enable the input clock; otherwise, leave the shunt in place.
2
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MAX3867 Evaluation Kit
2) Remove the shunt from JU5 to enable the outputs. Note: When performing the following resistance checks, manually set the ohmmeter to a high range to avoid forward biasing the on-chip ESD protection diodes. 3) Adjust R41, the MOD potentiometer, for 10k resistance between pins 1 and 3 (test point 3 and ground). 4) Adjust R42, the BIAS potentiometer, for 10k resistance between pins 1 and 3 (test point 2 and ground). 5) Adjust R40, the APC potentiometer, for 10k resistance between pins 1 and 3 (test point 8 and ground). 6) Apply a differential input signal (max amplitude 800mV per side) to J7 and J8 (DATA+ and DATA-). 7) If the latch is enabled, apply a differential clock signal (max amplitude 800mV per side) to J5 and J6 (CLK+ and CLK-). 8) Attach a high-speed oscilloscope with 50 inputs to J9. 9) Power up the board with a +3.3V supply. 10) Adjust R42 until the desired laser bias current is achieved: V - VTP12 I BIAS = TP13 15 11) Adjust R41 until the desired laser modulation current is achieved: I MOD = Signal Amplitude (Volts) 25 * cutout portion 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. Three of these pads (the middle and outside positions) are initially not connected. The other two pads are connected to V CC . Solder the anode and cathode of the monitor photodiode to any two of the three pads that are not connected. Then connect the anode to the MD pin by shorting the corresponding solder jumper (Figure 1). Connect the cathode to VCC by using solder to bridge to an adjacent VCC pad.
Evaluates: MAX3867
Note: When performing resistance checks, manually set the ohmmeter to a high range to avoid forward biasing the on-chip ESD protection diodes. 4) Adjust R14, the MOD potentiometer, for maximum resistance between pins 1 and 3 (test point 5 and ground). 5) Adjust R15, the BIAS potentiometer, for maximum resistance between pins 1 and 3 (test point 4 and ground). 6) Adjust R16, the APC potentiometer, for desired optical power. (Refer to the Design Procedure section of the MAX3867 data sheet.) 7) Apply a differential input signal (800mV per side) to J1 and J2 (DATA+ and DATA-). 8) Apply a differential clock signal (800mV per side) to J3 and J4 (CLK+ and CLK-). 9) Attach the laser diode fiber connector to an optical/electrical converter. 10) Power up the board with a +3.3V supply. 11) Adjust R15 until the LED (D1) is no longer illuminated. Optical power can be observed on an oscilloscope connected to an optical/electrical converter. 12) Adjust R14 until the desired optical amplitude is achieved. Optical amplitude can be observed on an oscilloscope connected to an optical/electrical converter.
Optical Evaluation
For optical evaluation of the MAX3867, configure the EV kit as follows: 1) If data is to be latched, remove the shunt from JU1 to enable the input clock; otherwise, leave the shunt in place. 2) Remove the shunt from JU2 to enable the outputs. 3) 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 MD (Figure 1) as follows: * Keeping its leads as short as possible, connect the laser diode to two of the three pads in the
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MAX3867 Evaluation Kit Evaluates: MAX3867
Adjustment and Control Descriptions (see Quick Start first)
COMPONENT OPTICAL JU1 JU2 -- R14 R15 ELECTRICAL JU4 JU5 J8 R41 R42 NAME FUNCTION Enables/disables the clock input. Shunt for direct data transmission. Remove shunt to enable clock input. Enables/disables the output currents. Shunt to disable the part. Remove shunt for normal operation. Electrical Output Adjusts the laser modulation current. Adjusts the laser bias current. In open-loop mode, R15 or R42 adjusts the laser bias current. In closed-loop operation, R15 or R42 adjusts the maximum laser bias current. For closed-loop operation, R16 or R40 adjusts the MD current level. TTL low level indicates a failure in the APC loop. Refer to the Design section of the MAX3867 data sheet. Set APC current, then increase bias current until LED goes off (LED is illuminated when the APC loop is open, and off when the APC loop is closed).
CLOCK DISABLE OUTPUT DISABLE Electrical Output SMA MOD BIAS
R16 TP1 D1
R40 TP10 D3
APC Fail Indicator Fail Indicator
4
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MAX3867 Evaluation Kit Evaluates: MAX3867
CONFIGURATION 1
CONFIGURATION 2
TOP OF PC BOARD VCC
R20 VCC
TOP OF PC BOARD VCC
R20 VCC
LD
TO-46 CAN LASER/PHOTODIODE PAIR
LD
TO-46 CAN LASER/PHOTODIODE PAIR
PD
PD
SOLDER BRIDGES
VCC
VCC
SOLDER BRIDGES TO MD
VCC
VCC
TO MD BOTTOM OF PC BOARD
BOTTOM OF PC BOARD
CONFIGURATION 3
CONFIGURATION 4
TOP OF PC BOARD VCC
R20 VCC
TOP OF PC BOARD VCC
R20 VCC
LD
TO-46 CAN LASER/PHOTODIODE PAIR
LD
TO-46 CAN LASER/PHOTODIODE PAIR
PD
PD
SOLDER BRIDGES
VCC
VCC
SOLDER BRIDGES TO MD
VCC
VCC
TO MD BOTTOM OF PC BOARD
BOTTOM OF PC BOARD
Figure 1. Attachment of Laser Diode/Monitor Diode to MAX3867 EV Kit _______________________________________________________________________________________ 5
Evaluates: MAX3867
TP8 R40 100k TP3 VCC TP2 TP13 VCC VCC TP11 R5 1.5k C45 0.01F 2 Q2 FMMT591A 1 4 APC TEST CIRCUIT MAX495 3 3 MD C24 0.01F BIAS 6 U3 7 2 R46 15 C21 OPEN C41 0.01F C42 0.22F VCC C14 OPEN R22 1.5k R23 1.0k R47 1.5k
48
47
46
45
44
43
42
41
40
39
38
VCC
N.C.
GND
APCSET
GND
GND
DATA+ R28 124 GND GND VCC DATA+ DATAVCC GND 33 VCC 32 31 30 29 28 27 26 25 VCC C44 OPEN GND 34 MD 35 GND 2 3 4 5 1 36
N.C.
N.C.
BIASMAX
MODMAX
CAPAPC
VCC
J7 SMA C25 0.01F
C26 0.1F
R25 84.5
37
MAX3867 Evaluation Kit
GND
GND
SLWSTRT
VCC
FAIL
GND
LATCH
GND
N.C.
CLK+ 13 14 15 16 17 18 19 20 21 22 23 24 R32 124
ENABLE
APCFILT
VCC
Figure 2. MAX3867 EV Kit Schematic--Electrical Configuration
R41 50k R42 200k C40 10F VCC MD C43 1000pF L13 MURATA BLM21A1025S
6
U2
VCC N.C. OUTOUT+ N.C. VCC N.C. BIAS 6 7 GND VCC CLK+ CLKVCC GND C28 0.01F 8 9 10 11 R30 84.5 12
R38 49.9
VCC1
L9 1.2H
GND1
VCC
VCC
J8 SMA
R26 84.5
DATA-
C27 0.1F
R29 124
MAX3867
L10 MURATA BLM11HA601SPT
C39 0.056F R44 24.9 L11 C37 MURATA 0.056F BLM11HA601SPT L7 MURATA BLM21A1025S
VCC
J9 SMA
J5 SMA
C29 0.1F
BIAS TP12 C32 0.01F
R49 49.9
VCC
J6 SMA
R31 84.5
CLKJU4 JU5 TP10 D3 LED C33 OPEN
C34 0.1F
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R45 0 VCC VCC R37 OPEN TP17 OPEN TP18 OPEN R43 0 VCC R34 110 C31 OPEN
C30 0.1F
R33 124
R16 100k TP5
TP6
R14 50k TP4
R21 49.9 R15 200k
TP14 C9 OPEN C15 OPEN
VCC VCC C20 0.01F C16 0.22F VCC C2 0.01F MONITOR PHOTODIODE MOUNTING PADS (USE ANY TWO) SB1 47 46 45 44 43 42 41 40 39 38 37 R1 1.5k R2 1.5k R3 1.0k
GND
L4 1.2H
C19 10F
VCC
VCC R6 84.5 VCC N.C. GND N.C. APCSET GND GND N.C. VCC C1 0.01F GND MD GND GND 33 VCC MURATA BLM11A601SPT L5 32 31 30 29 28 27 26 25 MURATA BLM21A102SPT L1 VCC C4 0.01F C23 0.1F L2 MURATA BLM11HA601SPT R20 27.4 R36 43.2 34 C8 OPEN 35 L3 0 36 BIASMAX CAPAPC 1 GND GND VCC DATA+ DATAVCC GND VCC OUT+ N.C. VCC N.C. BIAS GND VCC GND SLWSTRT VCC FAIL GND LATCH GND N.C. APCFILT ENABLE CLK+ CLKVCC GND N.C. 2 3 4 5 48
SB4
C22 0.01F SB2 SB5
J1 SMA R8 124 MODMAX
C10 0.1F
DATA+
SB3 C6 1000pF
SB6
13
14
15
16
17
18
19
20
21
22
23
R12 124
VCC
24
Figure 3. MAX3867 EV Kit Schematic--Optical Configuration
C36 0.01F VCC C7 0.056F VCC
VCC
J2 SMA
R7 84.5
DATA-
U1
VCC OUT-
6 7 C3 0.01F 8 9 10 11 R10 84.5 12
R27 24.9
C11 0.1F
R9 124
MAX3867
MURATA BLM11A601SPT L6
VCC
J3 SMA
C12 0.1F
CLK+
C35 OPEN
C17 0.01F
LASER DIODE MOUNTING PADS (USE TWO) VCC
C38 0.01F
J4 SMA
R11 84.5
CLKJU1 JU2 D1 LED TP1 C5 OPEN
C13 0.1F
R13 124
R48 0 C18 OPEN VCC R19 OPEN TP15 OPEN
R18 110
VCC VCC R35 0 TP16 OPEN
Evaluates: MAX3867
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MAX3867 Evaluation Kit
7
MAX3867 Evaluation Kit Evaluates: MAX3867
1.0"
1.0"
Figure 4. MAX3867 EV Kit Component Placement Guide-- Component Side
Figure 5. MAX3867 EV Kit PC Board Layout--Component Side
8
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MAX3867 Evaluation Kit Evaluates: MAX3867
1.0"
1.0"
Figure 6. MAX3867 EV Kit PC Board Layout--Ground Plane
Figure 7. MAX3867 EV Kit PC Board Layout--Power Plane
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9
MAX3867 Evaluation Kit Evaluates: MAX3867
1.0"
Figure 8. MAX3867 EV Kit PC Board Layout--Solder Side
10
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MAX3867 Evaluation Kit Evaluates: MAX3867
NOTES
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11
MAX3867 Evaluation Kit Evaluates: MAX3867
NOTES
Maxim makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Maxim assume any liability arising out of the application or use of any product or circuit and specifically disclaims any and all liability, including without limitation consequential or incidental damages. "Typical" parameters can and do vary in different applications. All operating parameters, including "typicals" must be validated for each customer application by customer's technical experts. Maxim products are not designed, intended or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Maxim product could create a situation where personal injury or death may occur.
12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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