MAX3780EVKIT [MAXIM]
Evaluation Kit for the MAX3780 ; 评估板MAX3780\n
| 型号： | MAX3780EVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Evaluation Kit for the MAX3780
|
| 文件： | 总11页 (文件大小：633K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2471; Rev 0; 5/02
MAX3780 Evaluation Kit
General Description
Features
ꢀ Fully Assembled and Tested
The MAX3780 evaluation kit (EV kit) is an assembled
demonstration board that provides easy evaluation of
the MAX3780 quad 2.5Gbps cable transceiver. The
MAX3780 EV kit requires only a single +3.3V supply
and includes an LED to indicate the lock status of the
MAX3780 PLLs.
ꢀ +3.3V Operation
ꢀ Allows Easy Testing of Thermal Performance
ꢀ Easy Selection of Operating Modes
Component Suppliers
Ordering Information
SUPPLIER
AVX
PHONE
FAX
PART
TEMP RANGE
IC PACKAGE
803-946-0690
847-639-6400
803-626-3123
847-639-1469
MAX3780EVKIT
*EP = exposed pad.
0°C to +70°C
100 TQFP-EP*
Coilcraft
Component List
DESIGNATION
QTY
DESCRIPTION
DESIGNATION
QTY
DESCRIPTION
JU1–JU4, JU6,
C1–C21,
6
1
3
Shunts
JU7
0.1µF 10ꢀ, 10V (min)
ceramic capacitors
0402
C26–C28, C31,
C32, C34–C49,
C68, C69, C73,
C79–C90
57
JU3
2-pin header, 0.1 in center
56nH inductors
Coilcraft 0805CS-XKBC
L1, L3, L4
22pF 5ꢀ, 10V (min)
ceramic capacitor (0402)
R1
R2, R23, R25
R4, R6, R13
R5, R7
1
3
3
2
2
0
0
1
383Ω 1ꢀ resistor ꢁ0402ꢂ
0Ω 5ꢀ resistors ꢁ0402ꢂ
10.0kΩ 1ꢀ resistors ꢁ0402ꢂ
4.99kΩ 1ꢀ resistors ꢁ0402ꢂ
49.9Ω 1ꢀ resistors ꢁ0402ꢂ
Open
C22
C23
1
1
3
1
0.1µF 10ꢀ, 10V (min)
ceramic capacitor (0603)
1.0µF 10ꢀ, 10V (min)
ceramic capacitors (0805)
R8, R9
C24, C70, C74
C29
R14–R22
TP2
33µF 10ꢀ, 4V (min)
tantalum capacitor
Open
U1
MAX3780CCQ 100-pin TQFP-EP
2.2µF 10ꢀ, 10V (min)
ceramic capacitor (0805)
Inverter
C30
D1
1
1
Digi-Key 296-1106-1 or
Texas Instruments
SN74AHCT04PWR
U2
1
Green LED T-1 package
SMB connectors, PC mount
Digi-Key J467-ND
J1–J38
38
VCC, GND,
TP1, TP3
4
1
Test points
J44–J48,
J51–J61
SMA connectors, side-mount tabs
Digi-Key J502-ND
16
5
MAX3780 EV kit circuit board,
rev B
None
JU1, JU2, JU4,
JU6, JU7
3-pin headers, 0.1in centers
None
None
1
1
MAX3780 EV kit data sheet
MAX3780 data sheet
________________________________________________________________ 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.
MAX3780 Evaluation Kit
Interfacing to LVDS Inputs and Outputs
The LVDS outputs ꢁRDAT1–RDAT8 and RCLK ꢂ are
AC-coupled to allow direct interfacing to 50Ω oscillo-
scopes. The LVDS inputs ꢁTDAT1–TDAT8 and TCLK ꢂ
are DC-coupled. For these inputs to function properly,
provide the proper AC and DC voltages. The LVDS
inputs require DC biasing and therefore cannot be AC-
coupled. For this reason, if the LVDS outputs are to be
externally looped back to the LVDS inputs, the AC-cou-
pling capacitors on the EV board ꢁC2–C9 and C11–C20ꢂ
must be replaced with 0Ω shorts.
Quick Start
1ꢂ Apply +3.3V to the V
pin ꢁJ49ꢂ. Connect the
CC
power-supply ground to the GND pin ꢁJ50ꢂ.
2ꢂ Disable system loopback by shorting the V
side
CC
of the LOOPEN jumper.
3ꢂ Set LVDS outputs for normal operation by shorting
the VCC side of TRIEN.
4ꢂ Apply 2.5Gbps data to the RX4 inputs. If possible,
apply 2.5Gbps data to all RX1 to RX4 inputs.
5ꢂ Apply a 125MHz reference clock to the REFCLK
inputs.
Interfacing to PECL Inputs and Outputs
The REFCLK inputs of the MAX3780 use PECL logic. To
simplify interfacing with test equipment, the evaluation
board includes terminations of 50Ω to ground on each
input, as well as DC-biasing resistors. The REFCLK
inputs should be driven with a differential signal with
6ꢂ Apply 1.25Gbps LVDS data to the TDAT1 and
TDAT2 inputs.
7ꢂ Apply a 625MHz input clock to the TCLK inputs.
The phase drift between TCLK and REFCLK must
be < 800ps after reset. For more information, refer
to the MAX3780 data sheet.
amplitude between 620mV
and 1860mV
.
P-P
P-P
Terminating Unused Outputs
If one side of a differential signal is being observed on
a 50Ω oscilloscope, balance the circuit by similarly ter-
minating the other output.
8ꢂ Briefly short the GND side of the RESET jumper.
Move the short to the V
side.
CC
9ꢂ The LOCK LED should light, indicating that the
transmitter and receiver are in lock.
Temperature Sensor
The MAX3780 has an integrated temperature sensor to
indicate the die temperature. To independently power
the temperature circuit, remove the jumper from JU3
and apply 3.3V to TP3. This allows calibration of the
temperature sensor.
10ꢂ The demultiplexed data from RX4 should be pre-
sent at the RDAT7 and RDAT8 outputs, with the
recovered 625MHz clock at the RCLK outputs.
11ꢂ The data applied at the TDAT1 and TDAT2
inputs should be multiplexed and present at the
TX1 outputs.
Exposed-Pad Package
The exposed-pad ꢁEPꢂ, 100-pin TQFP incorporates fea-
tures that provide a low thermal resistance path for heat
removal from the IC. The pad is electrical ground on the
MAX3780 and must be soldered to the circuit board for
proper thermal and electrical performance.
Detailed Description
Interfacing to CML Inputs and Outputs
All CML inputs ꢁRX1–RX4 ꢂ and outputs ꢁTX1–TX4 ꢂ on
the MAX3780 are AC-coupled and terminated to simpli-
fy connections. Differential input data with between
200mV
and 800mV
ꢁ100mV
and 400mV
as
P-P
P-P
P-P
P-P
measured single endedꢂ amplitude should be applied
to the CML inputs. The CML outputs are AC-coupled,
allowing direct connection to 50Ω oscilloscopes.
2
_______________________________________________________________________________________
MAX3780 Evaluation Kit
Table 1. Controls, Test Points, and LEDs
HEADER
NAME
TYPE
DESCRIPTION
PIN
V
Short for normal operation.
CC
TRIEN ꢁJU1ꢂ
3-pin header
GND
Short to put LVDS outputs in high-impedance state.
V
Short for normal operation.
CC
LOOPEN ꢁJU2ꢂ
RESET ꢁJU4ꢂ
EQ2 ꢁJU6ꢂ
3-pin header
3-pin header
3-pin header
3-pin header
2-pin header
LED
GND
Short to enable loopback testing.
V
Short for normal operation.
CC
GND
MIN
Momentarily short to reset FIFO and receiver components.
Sets EQ2 = 1 for minimum compensation ꢁrefer to Table 1 in MAX3780 data sheetꢂ.
Sets EQ2 = 0 for maximum compensation ꢁrefer to Table 1 in MAX3780 data sheetꢂ.
Sets EQ1 = 1 for minimum compensation ꢁrefer to Table 1 in MAX3780 data sheetꢂ.
Sets EQ1 = 0 for maximum compensation ꢁrefer to Table 1 in MAX3780 data sheetꢂ.
MAX
MIN
EQ1 ꢁJU7ꢂ
MAX
VCCTEMP
ENABLE ꢁJU3ꢂ
—
—
Short to connect VCCTEMP to rest of board supply network.
D1 lights to indicate that the transmitter and receiver PLLs of the MAX3780 are in
lock.
LOCK ꢁD1ꢂ
When the TMPSENS circuit is powered, the voltage at TP1 is proportional to the die
junction temperature.
TMPSENS ꢁTP1ꢂ
PTPIN ꢁTP2ꢂ
Test point
Test point
Test point
—
—
—
Reserved for Maxim use.
With JU3 removed, the temperature-sensing circuit can be independently powered
by applying +3.3V to TP3.
VCCTEMP ꢁTP3ꢂ
_______________________________________________________________________________________
3
MAX3780 Evaluation Kit
VCC
J38
SMB
J37
SMB
J36
SMB
J35
SMB
J34
SMB
J33
SMB
J32
SMB
J31
SMB
J30
SMB
J29
SMB
VCC1
R23
0
L1
56nH
C69
0.1
C70
1.0
F
F
R2
0
VCC2
L4
56nH
C31
0.1
C24
1.0
F
F
F
VCC5
R25
0
L3
56nH
C68
J49
J50
0.1
F
VCC
GND
C29
33
C74
1.0
C30
2.2
C73
0.1
C32
0.1
F
F
F
F
100
99
98
97
96
95
94
93
92
91
90
89
J1
SMB
R22
OPEN
1
2
3
4
5
6
7
8
9
GND
VCC1
C1
J2
0.1
F
SMB
VCC1
C2
0.1
F
F
F
F
J3
SMB
RDAT1+
C3
0.1
R21
RDAT1-
RDAT2+
RDAT2-
RDAT3+
OPEN
C4
0.1
J4
SMB
C5
0.1
J5
SMB
C6
0.1
F
F
F
R20
OPEN
C7
0.1
J6
SMB
RDAT3-
RDAT4+
C8
0.1
J7
SMB
C9
0.1
F
10
11
R19
OPEN
RDAT4-
VCC1
VCC1
J8
SMB
C10
0.1
F
12
13
14
15
U1
GND
C11
0.1
J9
SMB
F
F
MAX3780
RDAT5+
R18
OPEN
C12
0.1
RDAT5-
RDAT6+
J10
SMB
C13
0.1
F
F
C14
0.1
J11
SMB
16
17
RDAT6-
RDAT7+
RDAT7-
RDAT8+
RDAT8-
C15
0.1
R17
OPEN
F
F
F
F
F
F
C16
0.1
J12
SMB
18
19
20
21
22
23
24
25
C17
0.1
J13
SMB
C18
0.1
R16
OPEN
C19
0.1
J14
SMB
RCLK+
C20
0.1
RCLK-
TRIEN
VCC1
GND
J15
SMB
R15
OPEN
VCC1
J16
SMB
C21
0.1
F
J17
SMB
VCC
26
D1
LED
27 28
VCC
29
30 31
VCC2
32
33
34
35
36
37
R14
OPEN
VCC1
VCC1
C23
0.1
J18
F
C26
0.1
C27
0.1
C28
F
C34
0.1
SMB
R13
10.0k
C22
22pF
C85
F
VCC1
R1
383
F
F
0.1
F
0.1
C84
F
U2-A
0.1
2
JU1
TRIEN
74HCO4
J61
SMATAB
J60
SMATAB
J58
SMATAB
J59
SMATAB
Figure 1. MAX3780 EV Kit Schematic (Sheet 1 of 2)
_______________________________________________________________________________________
4
MAX3780 Evaluation Kit
J25
SMB
J24
SMB
J21
SMB
J28
SMB
J27
SMB
J26
SMB
J23
SMB
J22
SMB
J20
SMB
J19
SMB
VCC
R9
49.9
R7
4.99k
VCC
C49
C48
R8
49.9
R6
10.0k
0.1
F
0.1
F
R5
VCC1
79
C82
0.1
4.99k
F
R4
10.0k
88
87
86
85
84
83
82
81
80
78
77
76
75
74
GND
VCC5
VCC5
VCC
C47
0.1
F
73
72
TXFIL
RESET
JU4
RESET
71
GND
VCC4
TX1+
VCC1
C46
C81
0.1
F
70
69
0.1
F
J44
SMATAB
C45
J45
0.1
F
68
67
TX1-
SMATAB
VCC1
VCC4
C90
C44
0.1
0.1
F
F
66
65
J46
TX2+
TX2-
VCC4
GND
SMATAB
C43
0.1
VCC1
F
J47
SMATAB
64
U1
C80
0.1
F
63
62
MAX3780
VCC1
VCC4
TX3+
C89
C42
0.1
0.1
F
J48
SMATAB
F
61
C41
0.1
VCC1
F
J51
SMATAB
60
59
TX3-
VCC4
TX4+
TX4-
C88
0.1
C40
F
F
0.1
58
57
J52
SMATAB
C39
F
0.1
J53
SMATAB
VCC1
C79
56
55
54
VCC4
VCC1
0.1
F
GND
EQ1
EQ2
JU7
EQEN1
53
52
VCC1
PTPIN
GND
TP2
PTPIN
51
JU6
EQEN2
38
39
40
41
42
43
44
VCC1
45
46
47
VCC1
48
49 50
VCC1
VCC1
TMPSENS
TP1
C83
0.1
C35 C36
0.1
0.1
F
C37
C38
0.1
VCCTEMP
TP3
C86
F
F
F
C87 0.1
F
F
0.1
VCC1
0.1
F
JU3
VCC1
VCCTEMP
ENABLE
JU2
LOOPEN
J56
SMATAB
J54
SMATAB
J57
SMATAB
J55
SMATAB
Figure 1. MAX3780 EV Kit Schematic (Sheet 2 of 2)
_______________________________________________________________________________________
5
MAX3780 Evaluation Kit
1.0"
Figure 2. MAX3780 EV Kit Component Placement Guide—Component Side
6
_______________________________________________________________________________________
MAX3780 Evaluation Kit
1.0"
Figure 3. MAX3780 EV Kit PC Board Layout—Component Side
_______________________________________________________________________________________
7
MAX3780 Evaluation Kit
1.0"
Figure 4. MAX3780 EV Kit PC Board Layout—Solder Side
8
_______________________________________________________________________________________
MAX3780 Evaluation Kit
1.0"
Figure 5. MAX3780 EV Kit PC Board Layout—Power Plane
_______________________________________________________________________________________
9
MAX3780 Evaluation Kit
1.0"
Figure 6. MAX3780 EV Kit PC Board Layout—Ground Plane
10 ______________________________________________________________________________________
MAX3780 Evaluation Kit
1.0"
Figure 7. MAX3780 EV Kit Component Placement Guide—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 ____________________ 11
© 2002 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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