MAX3741EVKIT [MAXIM]
Evaluation Kit for the MAX3741 ; 评估板MAX3741\n
| 型号： | MAX3741EVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Evaluation Kit for the MAX3741
|
| 文件： | 总6页 (文件大小：248K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2695; Rev 0; 12/02
MAX3741 Evaluation Kit
General Description
Features
ꢀ Fully Assembled and Tested
The MAX3741 evaluation kit (EV kit) is an assembled
demonstration board that provides complete optical
and electrical evaluation of the MAX3741 compact
VCSEL driver.
ꢀ Single +3.3V Power-Supply Operation
ꢀ Allows Optical and Electrical Evaluation
The EV kit has an electrical test section and an optical
test section. Electrically, the output of the evaluation
board is interfaced to an SMA connector, which can be
connected to a 50Ω terminated oscilloscope. Optically,
the board can be configured to interface with a com-
mon-cathode VCSEL.
Component Suppliers
Ordering Information
SUPPLIER
PHONE
FAX
PART
TEMP RANGE IC PACKAGE
AVX
803-946-0690
847-639-6400
814-237-1431
516-543-7100
803-626-3123
847-639-1469
814-238-0490
516-864-7630
MAX3741EVKIT -40°C to +85°C 16 Thin QFN (3mm x 3mm)
Coilcraft
Murata
Zetex
Note: When contacting these suppliers, please indicate that
you are using the MAX3741.
Component List
DESIGNATION
QTY
DESCRIPTION
DESIGNATION
R4
QTY
1
DESCRIPTION
20kΩ potentiometer
C1, C2, C9, C10,
C12, C13, C14
0.1µF 10% ceramic capacitors
(0402)
7
R5, R9
R6
2
49.9Ω resistors (0402)
50kΩ potentiometer
350Ω resistor (0402)
120Ω resistor (0402)
0Ω resistor (0402)*
MAX3741ETE
1
0.01µF 10% ceramic capacitors
(0402)
C3–C7
5
2
R10
1
R11
1
10µF 10% tantalum capacitors,
case B
C8, C11
R12
1
U1
1
GND, VCC,
TP1–TP7, TP9,
TP10
11
Test points
None
None
None
1
Shunt
1
MAX3741 EV board
MAX3741 data sheet
JU1
J1, J2, J3, J6–J9
L1
1
7
1
2-pin header, 0.1in center
SMA connectors, tab contacts
1µH inductor (805)
1
*Not populated, but can be installed for optical evaluation.
Quick Start
Electrical Evaluation
To ensure proper operation in the electrical configura-
tion, set up the evaluation board as follows:
600Ω ferrite bead (0603)
Murata BLM18HD102SN1B
L2
L3
1
1
600Ω ferrite bead (0603)*
Murata BLM18HD102SN1B
R1
1
4
10kΩ potentiometer
1) To enable the outputs, connect TX_DISABLE to
GND by placing a shunt on JU1.
R2, R3, R7, R8
Open
Note: When performing the following resistance
checks, autoranging DMMs can forward bias the
on-chip ESD protection and cause inaccurate mea-
surements. To avoid this problem, manually set the
DMM to a high range.
________________________________________________________________ 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.
MAX3741 Evaluation Kit
2) Adjust R6, the R
potentiometer, for 1.7kΩ
surements. To avoid this problem, manually set the
DMM to a high range.
BIASSET
resistance between TP3 (BIASSET) and ground.
3) Adjust R4, the R
potentiometer, for 20kΩ
5) Adjust R6, the R
potentiometer, for 1.7kΩ
BIASSET
PEAKSET
resistance between TP2 (PEAKSET) and ground to
disable peaking.
resistance between TP3 (BIASSET) and ground.
6) Adjust R4, the R
potentiometer, for 20kΩ
PEAKSET
4) Adjust R1, the R
potentiometer, for 10kΩ
resistance between TP2 (PEAKSET) and ground to
disable peaking.
MODSET
resistance between TP1 (MODSET) and ground.
5) Apply a differential input signal (250mV
to
7) Adjust R1, the R
potentiometer, for 10kΩ
MODSET
P-P
2200mV ) between SMA connectors J1 and J2
resistance between TP1 (MODSET) and ground.
P-P
(IN+ and IN-).
8) Apply a differential input signal (250mV
to
P-P
6) Attach a high-speed oscilloscope with a 50Ω input
2200mV ) between SMA connectors J1 and J2
P-P
to SMA connector J3 (OUT).
(IN+ and IN-).
7) Connect a +3.3V supply between VCC and GND.
Adjust the power supply until the voltage between
TP10 and ground is +3.3V.
9) Attach the laser-diode fiber connector to an opti-
cal/electrical converter.
10) Connect a +3.3V supply between VCC and GND.
Adjust the power supply until the voltage between
TP10 and ground is +3.3V.
8) Adjust R6 (R
) until the desired laser bias
BIASSET
current is achieved.
11) Adjust R6 (R
) until desired average optical
BIASSET
V
120Ω
TP6
power is achieved.
12) The BIAS current can be monitored at TP5
(V ) using the equation below:
I
=
BIAS
BIASMON
9) The BIAS current can be monitored at TP5
(V ) using the equation below:
BIASMON
9 × V
BIASMON
I
=
BIAS
350Ω
9 × V
BIASMON
I
=
BIAS
350Ω
13) Adjust R1 (R
) until the desired optical ampli-
MODSET
tude is achieved. Optical amplitude can be
observed on an oscilloscope connected to an opti-
cal/electrical converter.
10) Adjust R1 (R
) until the desired laser modu-
MODSET
lation current is achieved.
14) Adjust R14 (R
) until the desired amount of
PEAKSET
peaking is achieved.
Signal Amplitude (V)
I
=
MOD
50Ω
Adjustment and Control
Descriptions (see Quick Start)
11) Adjust R14 (R
) until the desired amount of
PEAKSET
peaking is achieved.
COMPONENT
NAME
FUNCTION
Optical Evaluation
For optical evaluation of the MAX3741, configure the
evaluation kit as follows:
Enables/disables the output
currents, install a shunt to
enable output currents
JU1
TX_DISABLE
1) Remove component R11.
2) Install a 0Ω resistor at R12 and install a 600Ω ferrite
Adjusts the laser modulation
current
R1
R4
R
MODSET
bead at L3 (Murata BLM18HD102SN1).
3) To enable the outputs, connect TX_DISABLE to
GND by placing a shunt on JU1.
Adjusts the peaking for the
falling edge of the VCSEL
R
PEAKSET
4) Connect a common-cathode VCSEL as shown in
Figure 1. Keep the leads short to reduce reflection.
Adjusts the VCSEL bias
current
R6
R
BIASSET
Note: When performing the following resistance
checks, autoranging DMMs can forward bias the
on-chip ESD protection and cause inaccurate mea-
TP5
BIASMON
Monitors the bias current
2
_______________________________________________________________________________________
MAX3741 Evaluation Kit
G N D
B I A S
B I A S S E T
P E A K S E T
M O D S E T
V C C
V C C
G N D
Figure 1. MAX3741 EV Kit Schematic
_______________________________________________________________________________________
3
MAX3741 Evaluation Kit
1.0"
1.0"
Figure 2. MAX3741 EV Kit Component Placement Guide—
Component Side
Figure 3. MAX3741 EV Kit PC Board Layout—Component Side
4
_______________________________________________________________________________________
MAX3741 Evaluation Kit
1.0"
1.0"
Figure 4. MAX3741 EV Kit PC Board Layout—Ground Plane
Figure 5. MAX3741 EV Kit PC Board Layout—Power Plane
_______________________________________________________________________________________
5
MAX3741 Evaluation Kit
1.0"
Figure 6. MAX3741 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
© 2002 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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