MAX3645EVKIT [MAXIM]
Evaluation Kit for the MAX3645 ; 评估板MAX3645\n
| 型号： | MAX3645EVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Evaluation Kit for the MAX3645
|
| 文件： | 总7页 (文件大小：256K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-3074; Rev 0; 11/03
MAX3645 Evaluation Kit
_______________ General Description
___________________________Features
The MAX3645 evaluation kit (EV kit) simplifies evaluation
of the MAX3645 limiting amplifier. The EV kit allows easy
programming of the loss-of-signal (LOS) threshold and
provides layout options for alternate output terminations.
♦
♦
♦
♦
♦
Easy +2.97V to +5.5V Electrical Evaluation
Fully Assembled and Tested
Easy LOS Threshold Programming
Designed for 50Ω Test Interfaces
Allows Alternate Output Terminations
____________________Component List
DESIGNATION
QTY
DESCRIPTION
33µF 10% tantalum capacitors
AVX TAJB336K010R
C1, C2
2
______________Ordering Information
3.3µF 10% ceramic capacitors
C3, C4
2
7
1
4
3
PART
MAX3645ESEEVKIT
MAX3645EEEEVKIT
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
IC PACKAGE
16 SOIC
16 QSOP
(0805)
C5–C9,
0.1µF 10% ceramic capacitors
C12, C13
Murata GRP155R61A104K
1000pF 10% ceramic capacitor
C11
Murata GRP155R71H102K
SMA connectors (edge mount)
EF Johnson 142-0701-801
Test points
______________ Component Suppliers
J1, J2, J5, J6
J3, J4, J9
SUPPLIER
AVX
PHONE
FAX
Digi-Key 5000K-ND
843-448-9411
847-639-6400
800-344-4539
770-436-1300
843-626-3123
847-639-1469
218-681-3380
770-436-3030
2×5-pin header block, 0.1in centers
Digi-Key S1012-36-ND
2-pin headers, 0.1in centers
Shunts
JU1
1
3
4
Coilcraft
Digi-Key
Murata
JU2–JU4
JU1–JU4
Digi-Key S9000-ND
Note: Please indicate that you are using the MAX3645 when
1.2µH inductors
L1, L2
R1, R2
R3
2
2
1
ordering from these suppliers.
Coilcraft 1008CS-122XJBC
84.5Ω 1% resistors (0402)
5kΩ variable resistor
________________________ Quick Start
1) Place a shunt on JU3 and remove shunts from JU2
and JU4.
Digi-Key 3296W-1-502-ND
100Ω 1% resistor (0402)
1kΩ 1% resistor (0402)
2kΩ 1% resistor (0402)
R4
R5
R6
1
1
1
2
2
2
1
2) Set the threshold resistor (RTH) to 100Ω by placing
a shunt at position 4 of JU1.
R8, R9
R13, R15
R19, R21
SB1
49.9Ω 1% resistors (0402)
49.9Ω 1% resistors (0805)
Not installed
3) Connect a +2V power supply to J3 (VCC), a –1.3V
power supply to J9 (VEE), and the power supply
ground to J4 (GND).
Solder bridge, open
Test points
TP1–TP3,
6
4) Apply a 155Mbps differential signal (10mVP-P
)
TP9–TP11
Digi-Key 5000K-ND
between SMA connectors J1 (DIN+) and J2 (DIN-).
MAX3645ESE 16-pin SOIC
(MAX3645ESEEVKIT)
MAX3645EEE 16-pin QSOP
(MAX3645EEEEVKIT)
5) Connect an oscilloscope with 50Ω terminations to
SMA connectors J5 (DOUT-) and J6 (DOUT+).
(To avoid overloading the oscilloscope, use 20dB of
attenuation between the outputs and the
oscilloscope inputs.)
U1
1
MAX3645ESE EV kit circuit board,
Rev A (MAX3645ESEEVKIT)
None
1
2
MAX3645EEE EV kit circuit board,
Rev A (MAX3645EEEEVKIT)
6) Monitor LOS by connecting a voltage meter to TP9.
Z1, Z2
0Ω resistors (0402)
________________________________________________________________ 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.
MAX3645 Evaluation Kit
DC-Offset Correction
The DC offset correction is disabled when a shunt is on
JU2. For normal operation, leave JU2 open.
______________ Detailed Description
The MAX3645 EV kit is a fully assembled and factory
tested demonstration board that enables testing of all
MAX3645 functions.
Data Input Terminations
The EV kit has a 100Ω differential input termination. If
the input is driven single-ended, terminate both sides of
the input with 50Ω to ground by shorting solder bridge
SB1.
Setting the LOS Threshold Resistor
Jumper bank JU1 is used to select the value of the
threshold resistor (RTH). Position 1 connects to the
potentiometer R3 that can be set to any resistance
value between 0Ω and 5kΩ. Positions 2–5 provide fixed
resistance settings of 2kΩ, 1kΩ, 100Ω, 0Ω respectively.
PECL Output Terminations
The outputs of the MAX3645 are PECL compatible and
any standard DC or AC termination can be used. Figure
1 illustrates typical DC and AC terminations.
Automatic Squelch
Placing a shunt on JU3 enables automatic squelch. This
jumper connects the LOS output directly to the DIS
input. If the data input signal drops below the LOS
assert level the outputs are automatically disabled.
When the data input signal returns above the LOS
deassert level the outputs are enabled.
When the data outputs are AC-coupled a shunt can be
put on JU4 to short VEE to ground. Otherwise JU4
should be left open.
To avoid overloading the oscilloscope, use 20dB of
attenuation between the data outputs and the
oscilloscope inputs.
2 _________________________________________________________________________________________
MAX3645 Evaluation Kit
DC-COUPLED PECL TERMINATION (DEFAULT)
+2V
VCC
OSCILLOSCOPE
Z1
0Ω
DOUT+
DOUT-
LOS
20dB
20dB
ZO = 50Ω
ZO = 50Ω
R21
OPEN
Z2
0Ω
50Ω
R19
OPEN
50Ω
MAX3645ESE
MAX3645EEE
R15
50Ω
LOS
VEE
R13
50Ω
-0.97V TO -3.5V
AC-COUPLED PECL TERMINATION
+3.3V OR +5V
VCC
OSCILLOSCOPE
Z1
0.1µ F
DOUT+
DOUT-
LOS
20dB
ZO = 50Ω
ZO = 50Ω
Z2
0.1µ F
R21
50Ω
20dB
R19
50Ω
MAX3645ESE
MAX3645EEE
R13, R15,
R19, R21
SUPPLY
R15
3.3V
5V
150Ω
270Ω
LOS
R13
VEE
0V
Figure 1. PECL Output Terminations
_________________________________________________________________________________________ 3
MAX3645 Evaluation Kit
L1
VCC
TP1
TP2
1.2µ H
VCC
GND
VEE
J3
J4
J9
R3
JU1
5kΩ
R2
C1
C3
84.5Ω
33µ F
3.3µ F
1
2
3
4
5
R6
2kΩ
C2
C4
L2
JU4
TP3
33µ F
3.3µ F
1.2µ H
R5
1kΩ
R1
VEE
84.5Ω
R4
100Ω
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CAZ2
CAZ1
GNDA
DIN+
DIN-
VCCA
TH
N.C.
C5
Z1
JU2
VEE
0.1µ F
J6
J5
0Ω
DOUT+
DOUT-
C6
C12
VCC
R21
0.1µ F
0.1µ F
J1
OPEN
DIN+
DIN-
VCCE
C8
R8
0.1µ F
VEE
49.9Ω
Z2
SB1
DOUT+
DOUT-
GNDE
LOS
0Ω
U1
OPEN
R9
C9
0.1µ F
49.9Ω
R19
OPEN
MAX3645ESE
MAX3645EEE
C7
VCC
C13
0.1µ F
J2
0.1µ F
VCC
C11
1nF
TP10
VEE
CSD
DIS
R15
49.9Ω
LOS
TP9
JU3
TP11
R13
49.9Ω
Figure 2. MAX3645 EV Kit Schematic
4 _________________________________________________________________________________________
MAX3645 Evaluation Kit
Figure 3. MAX3645ESE EV Kit Component Placement Guide—
Figure 4. MAX3645ESE EV Kit PC Board Layout—Component
Side
Component Side
Figure 5. MAX3645ESE EV Kit PC Board Layout—Ground
Plane
Figure 6. MAX3645ESE EV Kit PC Board Layout—Power
Plane
_________________________________________________________________________________________ 5
MAX3645 Evaluation Kit
Figure 8. MAX3645EEE EV Kit Component Placement Guide—
Component Side
Figure 7. MAX3645ESE EV Kit PC Board Layout—Solder
Side
Figure 10. MAX3645EEE EV Kit PC Board Layout—Ground
Plane
Figure 9. MAX3645EEE EV Kit PC Board Layout—
Component Side
6 _________________________________________________________________________________________
MAX3645 Evaluation Kit
Figure11. MAX3645EEE EV Kit PC Board Layout—Power
Plane
Figure12. MAX3645EEE 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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600____________________7
2003 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products
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