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19-4767; Rev 2; 1/99
MAX3885 Evaluation Kit
________________General Description
The MAX3885 evaluation kit (EV kit) simplifies evaluation of the MAX3885 2.488Gbps, SDH/SONET 1:16 deserializer. The EV kit requires only a single +3.3V supply and includes all the external components necessary to interface with 3.3V PECL and LVDS logic. The board can be connected directly to the output of a clock-and-data-recovery circuit (such as the MAX3875) and to the input of an LVDS device (such as an overhead termination circuit). A signal generator or stimulus system can be used with an oscilloscope to evaluate the MAX3885's basic functionality.
____________________________Features
o Single +3.3V Supply o Inputs and Outputs Terminated for Interfacing with 3.3V PECL and LVDS Logic o Fully Assembled and Tested Surface-Mount Board
Evaluates: MAX3885
Component Suppliers
SUPPLIER Coilcraft Sprague PHONE 847-639-6400 603-224-1961 FAX 847-639-1469 603-224-1430 PART MAX3885EVKIT
Ordering Information
TEMP. RANGE -40C to +85C IC PACKAGE 64 TQFP
Note: Please indicate that you are using the MAX3885 when contacting these component suppliers.
Component List
DESIGNATION C1, C3, C5, C7, C12-C21 C2, C4, C6, C8 C9 C10 C11 R1, R3, R5, R7 R2, R4, R6, R8 R12, R15, R18, R21, R24, R27, R30, R33, R36, R39, R42, R45, R48, R53, R56, R59, R62 QTY 14 0 1 1 0 4 4 DESCRIPTION 0.1F, 25V min, 10% ceramic caps (0603) Not installed (shorted by PC board trace) 33F, 10V min, 10% tantalum cap Sprague 293D336X0010C2 2.2F, 10V min, 10% tantalum cap Sprague 293D225X0010A2 Not installed (open) 133, 1% resistors (0603) 86.6, 1% resistors (0603) DESIGNATION R13, R14, R16, R17, R19, R20, R22, R23, R25, R26, R28, R29, R31, R32, R34, R35, R37, R38, R40, R41, R43, R44, R46, R47, R49-R52, R54, R55, R57, R58, R60, R61 J1-J6 J7-J40 L1 IN1, IN2 17 100, 1% resistors (0603) U1 None None QTY DESCRIPTION
0
Not installed
6 34 1 2 1 1 1
SMA connectors (PC mount) SMB connectors (PC mount) 56nH inductor Coilcraft 0805CS-560XKBC Test points MAX3885ECB MAX3885 EV kit PC board MAX3885 data sheet
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.
MAX3885 Evaluation Kit Evaluates: MAX3885
_______________Detailed Description
The MAX3885 EV kit simplifies evaluation of the MAX3885 deserializer. The EV kit operates from a single +3.3V supply and includes all the external components necessary to interface with 3.3V PECL and LVDS logic. Each PECL input (SCLK+, SCLK-, SD+, SD-) is terminated on the EV board with the Thevenin equivalent of 53 to (VCC - 2V). These inputs can be driven directly by the output of any 3.3V PECL device, such as a clock-and-data-recovery circuit (e.g., the MAX3875). For inputs other than directly coupled 3.3V PECL, provision is made on the board to AC couple the input. Remove the trace between C2, C4, C6, and C8 and install 0.1F 0603 ceramic capacitors (see the MAX3885 data sheet). All LVDS outputs (PCLK+, PCLK-, PD_+, PD_-) are differentially terminated with 100 resistors between complementary outputs. Each output can directly drive an LVDS input or a high-impedance input oscilloscope (see Connecting LVDS Outputs to 50 Oscilloscope Inputs). When driving an LVDS input that already includes 100 differential termination, remove the termination resistor corresponding to the appropriate LVDS output. The synchronization inputs (SYNC+, SYNC-) are internally terminated LVDS inputs with 100 differential input resistance. Ensure that LVDS devices driving these inputs are not redundantly terminated. All signal inputs and outputs use coupled 50 transmission lines. All input signal lines are of equal length to minimize propagation-delay skew. Likewise, all output signal lines are of equal length.
__________Applications Information
Connecting LVDS Outputs to 50 Oscilloscope Inputs
To monitor an LVDS signal on a 50 input oscilloscope, remove the differential load resistor between the complementary outputs and AC couple each output to an oscilloscope input. For example, to observe the PD0 signal on a 50 input instrument, remove resistor R15 from the EV board and place a capacitor or DC block in series with each output (PD0+ or PD0-) and the instrument input. Do not connect MAX3885 outputs directly to 50 inputs or terminations to ground. Choose a coupling capacitor large enough in value to prevent pattern-dependent distortion of the output signal.
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MAX3885 Evaluation Kit Evaluates: MAX3885
JH1 1 3 PD15PD14PD13PD12PD11PD10PD9PD85 7 9 11 13 15 17 19 2 4 6 8 10 12 14 16 18 20 PD15+ PD14+ PD13+ PD12+ PD11+ PD10+ PD9+ PD8+ C1 0.1F VCC JH2 1 PCLKPD7PD6PD5PD4PD3PD2PD1PD03 5 7 9 11 13 15 17 19 2 4 6 8 10 12 14 16 18 20 SD+ PCLK+ PD7+ PD6+ PD5+ PD4+ PD3+ PD2+ PD1+ PD0+ J3 SCLK+ C7 0.1F VCC R7 133 J4 1% SCLKL1 56nH C12 0.1F C13 0.1F C14 0.1F C15 0.1F VCC C16 0.1F C17 0.1F C18 0.1F R8 86.6 1% SYNCJ6 SYNC+ VCC R5 133 1% R6 86.6 1% SCLKC8 SHORT J5 SYNCSDC5 0.1F VCC R3 133 J2 1% R4 86.6 1% C4 SHORT C6 SHORT C3 0.1F R1 133 J1 1% R2 86.6 1% R10 OPEN JU3 R11 OPEN JU1 VCC R9 OPEN JU2 C11 OPEN
JU4 GND C2 SHORT SD+ SD-
SCLK+
SYNC+
IN1 +3.3V C9 33F 10V GND IN2
C10 2.2F 10V
C19 0.1F
C20 0.1F
C21 0.1F
Figure 1. MAX3885 EV Kit Schematic
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MAX3885 Evaluation Kit Evaluates: MAX3885
PD15PD15+ R60 OPEN J39 R61 OPEN J40 PD14+
PD14PD13+ R57 OPEN J37 R58 OPEN J38
PD13PD12+ R54 OPEN J35 R55 OPEN J36
PD12PD11+ R51 OPEN J33 R52 OPEN J34
PD11R46 OPEN J29 R47 OPEN J30
R62 100 1%
R59 100 1%
R56 100 1%
R53 100 1%
R48 100 1%
VCC PD10+ PD1064 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 PD14+ PD15PD14PD15+ PD13+ PD13GND PD12PD11PD12+ PD11+ PD10+ PD10GND GND VCC
1 GND SD+ SD2 3 4 5 6 7 8 9 SCLK+ SCLK10 11 12 13 14 SYNC15 16
GND GND VCC SD+ VCC SDVCC GND VCC SCLK+ VCC SCLKVCC SYNCSYNC+ GND GND
GND VCC PD9+ PD9PD8+ PD8VCC GND PD7+ PD7PD6+ PD6PD5+ PD5VCC GND
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 PD7+ PD7PD6+ PD6PD5+ PD5PD9+ PD9PD8+ PD8-
U1
MAX3885
PCLK+
PCLK-
PD2+
PD0+
PD1+
PD3+
PD0-
PD1-
PD4+
PD2-
PD3-
PD4-
GND
SYNC+ 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 PD4+ PD4-
J7
R12 100 1% J8
J9
R15 100 1% J10
VCC
J11
R18 100 1% J12
GND R21 100 1% J14
J13
J15
R24 100 1% J16
R13 OPEN PCLKPCLK+ R14 OPEN PD0-
R16 OPEN R17 OPEN PD0+ PD1-
R19 OPEN R20 OPEN PD1+ PD2-
R22 OPEN R23 OPEN PD2+ PD3-
R25 OPEN R26 OPEN PD3+
Figure 1. MAX3885 EV Kit Schematic (continued)
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MAX3885 Evaluation Kit Evaluates: MAX3885
PD10PD10+ R49 OPEN J31 R50 OPEN J32
R45 100 1%
PD10+ PD10R39 100 1% J26 PD9+ PD9PD8+ PD8PD8PD8+ PD7+ PD7PD6+ PD6PD5+ PD5R34 OPEN PD6PD6+ R35 OPEN PD7PD7+ J22 R37 OPEN R38 OPEN J24 J21 R33 100 1% R36 100 1% R40 OPEN R41 OPEN PD9PD9+ R43 OPEN R44 OPEN R42 100 1% J28
J25
J27
J23
PD4+ PD4J19
R30 100 1% J20
J17
R27 100 1% PD5J18
R31 OPEN R32 OPEN PD5+
R28 OPEN PD4PD4+ R29 OPEN
Figure 1. MAX3885 EV Kit Schematic (continued)
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MAX3885 Evaluation Kit Evaluates: MAX3885
1.0"
Figure 2. MAX3885 EV Kit Component Placement Guide--Component Side
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MAX3885 Evaluation Kit Evaluates: MAX3885
1.0"
Figure 3. MAX3885 EV Kit Component Placement Guide--Solder Side
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MAX3885 Evaluation Kit Evaluates: MAX3885
1.0"
Figure 4. MAX3885 EV Kit PC Board Layout--Component Side
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MAX3885 Evaluation Kit Evaluates: MAX3885
1.0"
Figure 5. MAX3885 EV Kit PC Board Layout--Solder Side
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MAX3885 Evaluation Kit Evaluates: MAX3885
1.0"
Figure 6. MAX3885 EV Kit PC Board Layout--Power Plane
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MAX3885 Evaluation Kit Evaluates: MAX3885
1.0"
Figure 7. MAX3885 EV Kit PC Board Layout--Ground Plane
______________________________________________________________________________________
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MAX3885 Evaluation Kit Evaluates: MAX3885
NOTES
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.
12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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