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19-7610; Rev 0, 05/04
MAX3905 Evaluation Kit
_______________ General Description
The MAX3905 evaluation kit (EV Kit) is an assembled demonstration board that provides electrical and optical evaluation of the MAX3905 150Mbps Automotive VCSEL Driver. All output current settings are adjustable by jumpers.
_________________________Features
Evaluates: MAX3905

Fully Assembled and Tested Easy Selection of Operating Modes Includes 3-Pin Socket for VCSEL Insertion
____________________ Component List
DESIGNATION QTY C1, C2 C3-C5, C9 C6 C8 C10, C11 C22 C23 J1-J4 J18, J19, TP1TP3, TP5, TP7 JP1, JP3, JP5 -JP13, JP16, JP17 JP2 JP18 L1 R1, R11-R13 R2, R5, R9 R3 R4 R6 R7 R10 U1 None None 2 4 1 1 2 1 1 4 7 13 1 1 1 4 3 1 1 1 1 1 1 DESCRIPTION 0.047F 10% ceramic capacitors (0402) 0.1F 10% ceramic capacitors (0402) 0.1F 10% ceramic capacitor (0603) 0.47F 10% ceramic capacitor (0603) Not Installed 10F tantalum capacitor 0.01F 10% ceramic capacitor (0603) SMA connectors, tab contact, edge mount Test points Digi-Key 5000K-ND 2-pin headers, 0.1in centers 3-pin + 1-pin header, 0.1in centers VCSEL (Not Installed) 1H inductor Coilcraft 1008CS-102XKB 49.9 1% resistors (1206) 49.9 1% resistors (0603) 16.2k 1% resistor (0603) 29.4k 1% resistor (0603) 10k 1% resistor (0603) 4.99 1% resistor (0603) Not Installed MAX3905* (packaged in 32 QFN for EV Kit only) MAX3905 evaluation circuit board, rev A MAX3905 data sheet
_________________________________________________________________Maxim Integrated Products
*Note: U1 has an exposed pad, which requires it to be solder attached to the circuit board to ensure proper functionality of the part.
______________ Ordering Information
PART TEMP. RANGE IC PACKAGE MAX3905EVKIT -40C to +140C** 32 QFN **Junction Temperature for die; EV Kit materials should not be heated beyond 85C.
______________Component Suppliers
SUPPLIER AVX Digi-Key Murata PHONE 843-448-9411 218-681-6674 770-436-1300 FAX 843-448-1943 218-681-3380 770-436-3030
Note: Please indicate that you are using the MAX3905 when ordering from these suppliers.
________________________ Quick Start
Electrical Evaluation
1) 2) 3) Connect a +3.3V or +5V supply to J19 and ground to J18. Apply 10Mbps to 50Mbps data to IN_TTL (J1) or 50Mbps to 150Mbps data to IN+ and IN- (J2 and J3). If TTL data is applied, leave jumper JP1 (DIFF) open. If differential data is applied, shunt jumper JP1. Shunt jumper JP3 to provide bias to the OUT pad. Shunt jumper JP2 (3DB) in the "Normal Power" position. Adjust jumpers JP5 - JP13 to change the output current as desired.
4) 5) 6)
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.
MAX3905 Evaluation Kit
Optical Evaluation
1) 2) Connect a +3.3V or +5V supply to J19 and ground to J18. Apply 10Mbps to 50Mbps data to IN_TTL (J1) or 50Mbps to 150Mbps data to IN+ and IN- (J2 and J3). If TTL data is applied, leave jumper JP1 (DIFF) open. If differential data is applied, shunt jumper JP1. Replace resistor R6 with a 0 resistor and remove resistor R5 and capacitor C4. 6) 7) 5) Solder a VCSEL at JP18, with the cathode of the VCSEL in the hole connected to R6 and the anode in either of the two other holes. Components R10 and C10 may be installed if necessary to compensate the VCSEL lead inductance. Shunt jumper JP2 (3DB) in the "Normal Power" position. Adjust jumpers JP5 - JP13 to change the output current as desired.
Evaluates: MAX3905
3)
4)
_______________________________________________ NAME DIFF (JP1) TYPE 2-pin header SHUNT POSITION OPEN SHUNT (GND) OPEN
Jumper and Test Point Descriptions
DESCRIPTION Enables TTL data input IN_TTL Enables differential data inputs IN+ and INEnables low power mode
NORMAL POWER Enables normal power mode 3DB (JP2) 3-pin + 1-pin header LOW POWER Connects 3DB pad to VCC with a 29.4k resistor. Enables low power mode when 4.75V VCC 5.25V. NORMAL POWER 5V
Connects 3DB pad to VCC with a 16.2k resistor. Enables normal power mode when 4.75V VCC 5.25V. For electrical evaluation, a bias voltage 0.9V VBIAS VCC should be applied at this jumper to turn on the output stage Applies an output stage bias voltage of VCC Sets the DT0 bit low Sets the DT0 bit high Sets the MOD bit low Sets the MOD bit high Sets the TC bit low Sets the TC bit high Sets the LOW bit low Sets the LOW bit high Enables squelch Disables squelch Monitors voltage on the TEMPSENS pad, corresponding to the junction temperature of the die.
JP3 DT01 and DT02 (JP5 and JP6) MOD1 and MOD2 (JP8 and JP7) TC1, TC2 and TC3 (JP9, JP10, and JP11) LOW1 and LOW2 (JP12 and JP13) SQEN (JP16) TEMPSENS (TP1)
2-pin header 2-pin headers 2-pin headers 2-pin headers 2-pin headers 2-pin header Test Point
OPEN SHUNT (VCC) OPEN SHUNT (VCC) OPEN SHUNT (VCC) OPEN SHUNT (GND) OPEN SHUNT (GND) OPEN SHUNT (GND) -
2 _________________________________________________________________________________________
MAX3905 Evaluation Kit Evaluates: MAX3905
R7 4.99 TP3 JP17 L1 1H C22 10F C 23 0.01F C6 0.1F C3 0.1F C8 0.47F C9 0.1F TP2 GN D VC C TP5 VC C TP7 VCC
J19
J18
JP13 JP12 LOW2 LOW1
JP11 TC 3
JP10 TC2
JP9 TC 1
VCC R3 16.2k VC C
VCC R4 29.4k LOW POWER VCC JP3 C5 JP16 SQEN 0.1F R5 49.9 C4 0.1F R6 10k JP18 R10 NOT IN STALLED C 10 N OT INSTALLED J4
32
31
30
29
28
27
26
25
JP2 NORMAL POWER 5V VEE 3DB SQEN OUT 24 23 22 21 VCC 20 VCC 19 18 17 JP8 MOD1 VCC VC C C11 NOT INSTALLED
TC3
TC2
LOW2
LOW1
TC1
1 JP1 DIFF J1 R1 49.9 R13 49.9 R11 49.9 R12 49.9 2 3 4 5 6 IN+ J2 R2 49.9 C1 0.047F 8 7
N .C. DIFF IN_TTL N .C. N .C. N .C. IN+ N .C.
IN _TTL
N.C.
VEE
VEE
OUT
MAX3905
OUT VC C MOD1
TEMPSEN S
N.C.
TP1 TEMPSENS
9
10
11
12
13
14
15
VCC INJ3 R9 49.9 C2 0.047F VCC JP5 DT01 JP6 DT02 JP7 MOD2 VCC
Figure 1. MAX3905 EV Kit Schematic
16
MOD2
DT01
DT02
VCC
N.C.
N.C.
IN-
_________________________________________________________________________________________
3
MAX3905 Evaluation Kit
Evaluates: MAX3905
2.625in
2.65in
Figure 2. MAX3905 EV Kit Component Placement Guide - Component Side
4 _________________________________________________________________________________________
MAX3905 Evaluation Kit Evaluates: MAX3905
Figure 3. MAX3905 EV Kit PC Board Layout - Component Side
Figure 4. MAX3905 EV Kit PC Board Layout - Ground Plane
_________________________________________________________________________________________
5
MAX3905 Evaluation Kit
Evaluates: MAX3905
Figure 5. MAX3905 EV Kit PC Board Layout - Power Plane
Figure 6. MAX3905 EV Kit 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.
6 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products

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