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, TP1-
TP3, 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
0.047µF
±10%
ceramic
capacitors (0402)
0.1µF
±10%
ceramic
capacitors (0402)
0.1µF
±10%
ceramic
capacitor (0603)
0.47µF
±10%
ceramic
capacitor (0603)
Not Installed
10µF tantalum capacitor
0.01µF
±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)
1µH inductor
Coilcraft 1008CS-102XKB
49.9Ω
±1%
resistors (1206)
49.9Ω
±1%
resistors (0603)
16.2kΩ
±1%
resistor (0603)
29.4kΩ
±1%
resistor (0603)
10kΩ
±1%
resistor (0603)
4.99Ω
±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
-40°C to +140°C**
32 QFN
**Junction Temperature for die; EV Kit materials should
not be heated beyond 85°C.
______________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 0Ω 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 IN-
Enables 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 29.4kΩ resistor. Enables
low power mode when 4.75V
≤
VCC
≤
5.25V.
NORMAL POWER
5V
Connects 3DB pad to VCC with a 16.2kΩ resistor. Enables
normal power mode when 4.75V
≤
VCC
≤
5.25V.
For electrical evaluation, a bias voltage 0.9V
≤
V
BIAS
≤
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
4.99Ω
TP3
JP17
L1
1µH
C22
10µF
C 23
0.01µF
C6
0.1µF
C3
0.1µF
C8
0.47µF
C9
0.1µF
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
16.2kΩ
VC C
VCC
R4
29.4kΩ
LOW
POWER
VCC
JP3
C5
JP16
SQEN
0.1µF
R5
49.9Ω
C4
0.1µF
R6
10kΩ
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
49.9Ω
R13
49.9Ω
R11
49.9Ω
R12
49.9Ω
2
3
4
5
6
IN+
J2
R2
49.9Ω
C1
0.047µF
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
IN-
J3
R9
49.9Ω
C2
0.047µF
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
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