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19-1978; Rev 0; 3/01
MAX3840 Evaluation Kit
General Description
The MAX3840 evaluation kit (EV kit) is a surface-mount demonstration board that provides easy evaluation of the MAX3840 2.7Gbps, dual 22 crosspoint switch. The board includes an extra transmission line for calibration purposes. The MAX3840 EV kit is fully assembled and tested. o +3.3V Single Supply o Includes Transmission Line for Calibration o Part Assembled in a 32-pin QFN Exposed-Pad (EP) Package
Features
o Fully Assembled and Tested Surface-Mount Board
Evaluates: MAX3840
Component List
DESIGNATION C1 C2 C3-C24, C27, C29-C31 R1-R8 R9-R12 L1 U1 JP1-JP8 JP1-JP8 J1-J20 J21, J22 None None None QTY 1 1 26 8 4 1 1 8 8 20 2 1 1 1 DESCRIPTION 33F 10% tantalum capacitor 2.2F 10% tantalum capacitor AVX TAJC225K016 0.1F 10% ceramic capacitors (0402) 1k 1% (0402) resistors 100 1% (0402) resistors 4.7H inductor, Coilcraft MAX3840EGJ, 32-pin QFN EP 1x2 pin headers (0.1in centers) Shunts Digi-Key S9000-ND SMA connectors (edge-mount) Test points MAX3840 Evaluation Kit circuit board MAX3840 Evaluation Kit data sheet MAX3840 data sheet SUPPLIER AVX Digi-Key Murata PART MAX3840EVKIT
Ordering Information
TEMP. RANGE -40C to +85C IC PACKAGE 32 QFN-EP
Component Suppliers
PHONE 803-946-0690 218-681-6674 814-237-1431 FAX 843-626-3123 218-681-3380 814-238-0490
Note: Please indicate that you are using the MAX3840 when contacting these component suppliers.
________________________________________________________________ Maxim Integrated Products
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For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
MAX3840 Evaluation Kit Evaluates: MAX3840
Detailed Description
The MAX3840 EV kit simplifies evaluation of the MAX3840 dual 22 crosspoint switch. The EV kit operates from a single +3.3V power supply and includes all external components necessary to interface with the CML inputs and outputs. The CML inputs (DIA_ and DIB_) are internally terminated on the MAX3840 with 100 differential input resistance and require no external termination. Ensure that the CML devices driving these inputs are not redundantly terminated. The CML outputs (DOA_ and DOB_) must be AC-coupled to a 50 termination (100 differential) load. On-board 100 differential terminations are provided to reduce noise outputs that are not used. the output monitored, otherwise the load impedance will not match the characteristic impedance of the line and the resulting reflections will cause a degradation in the output signal quality. If you are observing a singleended output, balance the other half with a 50 termination to ground (through the AC-coupling capacitor).
Connecting CML Outputs to High-Impedance Oscilloscope Inputs
To monitor the CML signals with high-impedance oscilloscope inputs, leave the coupling capacitors in series with the outputs, and make sure the differential load resistors are on all the outputs on the EV kit (R9-R12).
Layout Considerations
The input and output data lines have equal lengths to minimize channel-to-channel skew.
Connecting CML Outputs to 50 Oscilloscope Inputs
To monitor one or more CML signals with 50 oscilloscope inputs, leave the coupling capacitors in series with the outputs. Remove the associated 100 differential load resistors from the EV kit on the outputs (R9-R12). It is important to remove the 100 resistor on
Jumpers
Jumpers JP1, JP2, JP5, and JP6 select the input signals for channel A and B outputs. Jumpers JP3, JP4, JP7, and JP8 enable the output drivers for channel A and B (refer to Table 1).
Table 1. Output Routing
ROUTING CONTROLS SELA0/SELB0 0 0 1 1 X SELA1/SELB1 0 1 0 1 X OUTPUT CONTROLS ENA0/1 1 1 1 1 0 ENB0/1 1 1 1 1 0 DIA0/DIB0 DIA0/DIB0 DIA1/DIB1 DIA1/DIB1 Power Down OUTPUT SIGNALS SIGNAL AT DOA0/DOB0 SIGNAL AT DOA1/DOB1 DIA0/DIB0 DIA1/DIB1 DIA0/DIB0 DIA1/DIB1 Power Down
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MAX3840 Evaluation Kit
Board Effects
Evaluates: MAX3840
40 DETERMINISTIC JITTER (ps PK-P) 35 ATTENUATION (dB) PRBS 27-1 PRBS 215-1 30 25 20 15 10 5 0 K28.5 CJTPAT DATA PATTERNS
0 -5 -10 -15 -20 -25 -30 -35 -40 1 10 100 FREQUENCY (MHz) 1000 10000
Figure 1. Deterministic Jitter From Board Traces (Refer to application note HFAN-4.5.0, Rev 0, 12/00)
Figure 2. Attenuation vs. Frequency--Attenuation of Board Trace (Refer to application note HFAN-4.5.0, Rev 0, 12/00)
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MAX3840 Evaluation Kit Evaluates: MAX3840
L1 4.7H
VCC JP8 JP7 JP6 JP5 1 2 C12 0.1F 1 2 C11 0.1F 1 C13 0.1F J14 2 1 32 31 30 29 28 27 26 2 25 J1 1 SELA0 DIA0ENA0 DIA0+ DIASELA1 DIA+ C7 0.1F C13 0.1F 24 GND VCC DOAOP DOAON 23 VCC 22 21 20 VCC 19 18 17 VCC VCC 16 R10 100 R9 100 J14 2 R5 1k R6 1k R7 1k R8 1k VCC
C1 33F
C2 2.2F
C23 0.1F
C24 0.1F
J15 VCC
C3 0.1F
C4 0.1F
C5 0.1F
C6 0.1F
J16
1 2
ENA1 ENB1
VCC JP4 JP3 JP2 J2 2 1
DIP1P DIB1N ENBO
C15 0.1F J12 1 2 C16 0.1F J11 1 2
3 C8 0.1F 4 5 6 7
MAX3840
SELB0 DIB0P DIB0N DOB0N DOB0P DOP1P SELB1 VCC GND 9 VCC DOA1P DOAIN VCC
C17 0.1F J10 1 2 C18 0.1F J9 2
JP1 C9 0.1F 1 R4 1k R3 1k R2 1k R1 1k 2 J4 2 1 C10 0.1F
8 J3
1
10
11
12
13
14
DOBIN
VCC
VCC R12 100
VCC
15 1 2
VCC R11 100 C20 0.1F J7 C19 0.1F J8 2
J19
C30 0.1F 1
C29 0.1F 1
J17 2
J20 1 2
C27 0.1F
C31 0.1F 1
J18 2
C22 0.1F J5
1 2
C21 0.1F J6
1 2
1
2
Figure 3. MAX3840 EV Kit Schematic Diagram
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MAX3840 Evaluation Kit Evaluates: MAX3840
1.0"
Figure 4. MAX3840 EV Kit Component Placement Guide-- Component Side
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MAX3840 Evaluation Kit Evaluates: MAX3840
1.0"
Figure 5. MAX3840 EV Kit PC Board Layout--Component Side
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MAX3840 Evaluation Kit Evaluates: MAX3840
1.0"
Figure 6. MAX3840 EV Kit PC Board Layout--Ground Plane
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MAX3840 Evaluation Kit Evaluates: MAX3840
1.0"
Figure 7. MAX3840 EV Kit PC Board Layout--Power Plane
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MAX3840 Evaluation Kit Evaluates: MAX3840
1.0"
Figure 8. MAX3840 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.
9 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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