MAX3781EVKIT [MAXIM]
MAX3781 Evaluation Kit; MAX3781评估套件
| 型号： | MAX3781EVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | MAX3781 Evaluation Kit |
| 文件： | 总5页 (文件大小：302K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1763; Rev 1; 10/01
MAX3781 Evaluation Kit
General Description
Features
ꢀ Fully Assembled and Tested
The MAX3781 evaluation kit (EV kit) is an assembled
demonstration board that provides easy evaluation of
the MAX3781 multiplexer/buffer. The MAX3781 EV kit
provides 100Ω differential output terminations on-
board, simplifying termination of unused outputs.
ꢀ +3.3V Operation
ꢀ On-Board Output Termination
ꢀ Easy Selection of Operating Modes
Ordering Information
Component List
PART
TEMP RANGE
IC PACKAGE
DESIGNATION QTY
DESCRIPTION
MAX3781EVKIT
0°C to +85°C
48 TQFP-EP*
C1−C24,
28
0.1µF 10%, 25V min ceramic
capacitors (0603)
C27−C30
*Exposed pad
C25
1
1
33µF tantalum capacitor (C)
2.2µF 10%, 25V min tantalum
capacitor (B)
C26
R1, R2, R3
3
6
1kΩ 1% resistors (0603)
100Ω 1% resistors (0603)
Component Suppliers
R4−R9
SUPPLIER
PHONE
FAX
4.7nH inductor
TOKOLL1608-FH4N7K
L1
U1
1
1
AVX
803-946-0690
803-626-3123
TOKO
800-745-8656
847-699-7864
MAX3781UCM 48-pin TQFP-EP
Note: Please indicate that you are using the MAX3781 when
contacting these component suppliers.
SMA connectors (PC mount)
EFJohnson 142-0701-301
J1–J24
24
2-pin headers (0.1in centers)
Digi-Key S1012-36-ND
JU1, JU2, JU3
JU1, JU2, JU3
VCC, GND
3
3
2
Shunts
Digi-Key S9000-ND
Quick Start
1) Apply +3.3V to the VCC pin. Connect power-supply
ground to the GND pin.
Test points
Digi-Key 5000-ND
None
None
1
1
MAX3781 EV kit circuit board, rev A
MAX3781 data sheet
2) Shunt jumpers JU1 (SELA), JU2 (PD), and JU3
(SELB). Refer to Table 1 in the MAX3781 data sheet
for other configurations.
3) Apply up to 2.75Gbps differential data to LI2A
(J17 and J18).
4) Remove R9 (differential termination resistor) from
the evaluation board.
5) Connect SOA (J23 and J24) to a high-speed 50Ω
oscilloscope.
________________________________________________________________ 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.
MAX3781 Evaluation Kit
Control Lines
Jumpers JU1, JU2, and JU3 are provided to set the
operating mode of the MAX3781. Shorting these
jumpers pulls the corresponding TTL control line to a
logical zero. All TTL control lines are internally pulled
high through 15kΩ resistors. See Table 1 for more infor-
mation regarding setting operating modes.
Detailed Description
Connecting CML Outputs to 50Ω
Oscilloscopes
CML outputs have a common-mode voltage near VCC.
To avoid changing this optimum common-mode volt-
age, all CML outputs are AC-coupled on-board with
0.1µF capacitors. The CML outputs should not be con-
nected directly through 50Ω to ground.
Exposed-Pad Package
The exposed paddle (EP) 48-pin TQFP has features
that provide a very low thermal resistance path for heat
removal from the IC. The paddle is electrical ground on
the MAX3781 and should be soldered to the circuit
board for proper thermal and electrical performance.
Terminating Unused Outputs
The MAX3781 EV kit has 100Ω differential resistors
placed across all outputs. These resistors must be
removed before connecting the outputs to a 50Ω oscil-
loscope. For best performance, keep all outputs termi-
nated, either to a 50Ω measurement device or to the
100Ω differential resistor.
Table 1. Operating Modes
SEL_
PD
LO1_
SI_
−
LO2_
SI_
SI_
SI_
−
SO_
LI2_
LI2_
LI1_
LI1_
0
0
1
1
0
1
0
SI_
SI_
1
2
_______________________________________________________________________________________
MAX3781 Evaluation Kit
J24
J23
J22
J21
J20
J19
C23
C21
0.1µF
C20
0.1µF
0.1µF
C24
0.1µF
C22
0.1µF
C19
0.1µF
VCC
L1
J27
J28
4.7nH
J25
J26
J29
J30
CALIBRATION
STRIP
R9
100Ω
R8
100Ω
R7
100Ω
C25
33µF
C26
2.2µF
C27
0.1µF
C28
0.1µF
C29
0.1µF
C30
0.1µF
VCC
VCC VCC
VCC
VCC
48 47 46 45 44 43 42 41 40 39 38 37
C18
0.1µF
C1
0.1µF
1
2
3
4
5
6
7
8
36
35
34
33
32
31
30
29
J18
J16
J1
GND
LI2A-
J17
V
LI2A+
CC
VCC
R1
C16
C17
1kΩ
V
JU1
JU2
JU3
VCC
VCC
J2
SIA-
SIA+
SELA
PD
CC
0.1µF
0.1µF
C2
0.1µF
LI1A+
LI1A-
GND
GND
R2
1kΩ
J15
C15
0.1µF
MAX3781
C14
0.1µF
R3
1kΩ
SELB
GND
SIB+
SIB-
C3
J14
J12
LI1B-
LI1B+
0.1µF
9
10
11
12
28
27
26
25
J13
J3
J4
C12
0.1µF
C13
0.1µF
V
CC
V
LI2B+
LI2B-
VCC
CC
J11
GND
C4
0.1µF
C11
0.1µF
13 14 15 16 17 18 19 20 21 22 23 24
VCC
VCC
VCC
VCC
R4
100Ω
R5
100Ω
R6
100Ω
C6
0.1µF
C8
0.1µF
C9
0.1µF
C5
0.1µF
C7
0.1µF
C10
0.1µF
J5
J6
J7
J8
J9
J10
Figure 1. MAX3781 EV Kit Schematic
_______________________________________________________________________________________
3
MAX3781 Evaluation Kit
1.0"
Figure 2. MAX3781 EV Kit Component Placement Guide—Component Side
4
_______________________________________________________________________________________
MAX3781 Evaluation Kit
1.0"
1.0"
Figure 3. MAX3781 EV Kit PC Board Layout—Component Side
Figure 4. MAX3781 EV Kit PC Board Layout—Solder Side
1.0"
1.0"
Figure 5. MAX3781 EV Kit PC Board Layout—Power Plane
Figure 6. MAX3781 EV Kit PC Board Layout—Ground Plane
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 _____________________ 5
© 2001 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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