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19-2369; Rev 0; 4/02
MAX3802 Evaluation Kit
General Description
The MAX3802 evaluation kit (EV kit) is an assembled demonstration board that provides easy evaluation of the MAX3802 quad adaptive equalizer with cable drivers. SMA connectors with 50 controlled-impedance transmission lines to the MAX3802 are provided for all input and output ports. o Fully Assembled and Tested o Single +3.3V Power-Supply Operation o SMA Connectors for Inputs and Outputs o Includes Potentiometer for Adjusting Driver Output Amplitude
Features
Evaluates: MAX3802
Component List
DESIGNATION C1, C3 C2, C4 C7-C66 J1, J2, J35, J36, TP1-TP8 J3-J34 L1, L2 R1-R4 R5, R8, R10, R12 R6, R7, R9, R11 R13-R16 U1 None None QTY 2 2 60 12 32 2 4 4 4 4 1 1 1 DESCRIPTION 33F 10% tantalum capacitors (Case-B) 1F 10% ceramic capacitors (0805) 0.1F 10% ceramic capacitors (0402) Test points SMA connectors (edge mount) 56nH inductors (0805) 100k 1% resistors (0402) Open 0 resistors (0402) 20k potentiometers MAX3802UGK 68-pin QFN MAX3802 EV board MAX3802 data sheet PART MAX3802EVKIT
Ordering Information
TEMP RANGE 0C to +85C IC PACKAGE 68 QFN-EP
*EP = exposed pad
Quick Start
Connect power-supply ground to the GND pin (J35). Apply +3.3V to the VCC1 pin (J1). Due to a small voltage drop across the inductor, the true voltage on the part (measured across C1) is slightly lower than +3.3V. Adjust the power supply until the voltage across C1 measures +3.3V. Note: This step applies power to channels 1 and 2 only. To supply power to channels 3 and 4, ground and a +3.3V supply must be connected to J35 (GND) and J1 (VCC2).
Cable Driver
1) Connect a differential input signal (600mVP-P differential input amplitude) to one of the cable driver inputs at SMA edge connectors J9 (DIN1-) and J10 (DIN1+). 2) Connect a 50 oscilloscope to SMA output connectors J7 (DOUT-) and J8 (DOUT+) to observe the output of the cable driver.
Component Suppliers
SUPPLIER AVX Coilcraft Murata PHONE 803-946-0690 847-639-6400 814-237-1431 FAX 803-626-3123 847-639-1469 814-238-0490
Venkel 800-950-8365 512-794-0087 Please indicate that you are using the MAX3802 when contacting these component suppliers.
________________________________________________________________ Maxim Integrated Products
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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.
MAX3802 Evaluation Kit Evaluates: MAX3802
3) Adjust R13, the R MOD1 potentiometer, for 20k resistance by turning the potentiometer clockwise until a faint click is heard. 4) Potentiometer R13 (R MOD 1) can be adjusted between 10k and 20k to change the cable driver output amplitude. Note: Measuring the resistance on the potentiometer is difficult because of internal resistances and ESD diodes on the IC. The potentiometer can be removed and discrete resistors placed on the R5, R8, R10, and R12 positions, so that the exact resistance of RMOD can be known. Refer to Cable Driver Output vs. RMOD in the Typical Operating Characteristics of the MAX3802 data sheet for RMOD values.
Detailed Description
Connecting CML Outputs to 50 Oscilloscopes
CML outputs have a common-mode voltage near VCC, which is incompatible with oscilloscopes terminated in 50 to ground. To avoid interfering with the commonmode voltage, all MAX3802 CML outputs are ACcoupled on board with 0.1F capacitors. The CML outputs should not be connected directly through 50 to ground. Exposed-Pad Package The EP of the 68-pin QFN package provides a very low thermal resistance path for heat removal from the IC. The pad is also electrical ground on the MAX3802 and must be soldered to the circuit board for proper thermal and electrical performance. Refer to Maxim Application Note HFAN-08.1, Thermal Considerations for QFN and Other Exposed Pad Packages, available at www.maxim-ic.com for additional application information.
Adaptive Cable Equalizer
1) Connect a differential input signal (600mVP-P differential input amplitude) to a cable. Connect the other end of the cable to one of the cable equalizers' inputs at SMA edge connectors J3 (EIN1-) and J4 (EIN1+). 2) Connect a 50 oscilloscope to SMA output connectors J5 (EOUT1-) and J6 (EOUT1+) to view the output of the cable equalizer. 3) The cable integrity monitor (CIM1) high-impedance output can be monitored at TP1. 4) The loss-of-signal (LOS1) TTL output can be monitored at TP5. Note: The MAX3802 equalizer design requires that the data stream be scrambled or coded to provide a rich frequency spectrum for the adaptation algorithm. In the absence of an input signal (nonstandard application), amplified noise can appear at the output due to the large gain of the device.
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MAX3802 Evaluation Kit Evaluates: MAX3802
C66 RMOD4 0.1F L1 56nH J1 C1 33F J35 TP8 LOS4 L2 56nH J2 C3 33F J36 VCC1 J3 C7 0.1F EIN1+ C8 0.1F VCC1 TP1 CIM1 VCC1 J5 C9 0.1F C10 0.1F VCC1 RMOD1 C63 0.1F R12 OPEN J7 R13 20k R11 0 VCC1 C11 0.1F C12 0.1F VCC1 J9 C13 0.1F DIN1+ TP5 LOS1 C14 0.1F C4 1F VCC2 R4 100k C37 0.1F VCC2 C35 0.1F VCC2 VCC2 C34 0.1F C38 0.1F C36 0.1F R7 0 TP4 CIM4 C33 0.1F C32 0.1F C2 1F DIN4+ J34 DOUT4+ J32 R16 20k EOUT4J29 EIN4J27 VCC1 DIN4J33 DOUT4J31 R8 OPEN EOUT4+ J30 EIN4+ J28 C51 0.1F C52 0.1F C53 0.1F C54 0.1F
VCC2
C55 0.1F
VCC2 C31 0.1F C56 0.1F VCC2 C57 0.1F C58 0.1F C59 0.1F C60 0.1F C61 0.1F C62 0.1F
VCC2
VCC2
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
VCCE4
VCCE4
VCCE4
VCCD4
VCCD4
DOUT4+
DOUT4-
EOUT4+
RMOD4
EOUT4-
VCCE4
DIN4+
DIN4-
EIN4+
R3 100k LOS3 DIN3+ DIN3VCCD3 DOUT3+ DOUT3VCCD3 51 50 49 48 47 46 45 44 43 42 41 40 39 38 VCC2 C24 0.1F VCC2 VCC2 C26 0.1F VCC2 C27 0.1F C30 0.1F C29 0.1F VCC2 C28 0.1F
EIN4-
LOS4
CIM4
TP7 LOS3 DIN3+ DIN3J25 J26
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
VCCE1 EIN1EIN1+ VCCE1 CIM1 VCCE1 EOUT1-
EIN1J4
DOUT3+ DOUT3J23
J24
EOUT1J6 EOUT1+
RMOD3 R15 20k J22 R5 OPEN C65 0.1F
U1
EOUT1+ RMOD3
MAX3802
VCCE1 RMOD1 VCCD1 DOUT1DOUT1+ VCCD1 DIN1DIN1+ LOS1 VCCE3 EOUT3+ EOUT3VCCE3 CIM3 VCCE3
R6 0 EOUT3+ EOUT3J21
DOUT1J8 DOUT1+
C25 0.1F TP3 CIM3
DIN1J10
EIN3+ 37 EIN3VCCE3 36 35 VCC2 C23 0.1F EIN3-
EIN3+ J19
J20
EOUT2+
EOUT2-
VCCD2
DOUT2-
RMOD2
DOUT2+
VCCE2
VCCE2
VCCE2
VCCE2
EIN2-
EIN2+
DIN2-
DIN2+
18
19
20
CIM2
22
23
21
24
25
26
27
28
29
30
31
33
32
34
LOS2
R2 100k TP6 LOS2 C22 0.1F
R1 100k
VCC1
VCC1 C16 0.1F
VCC1
VCC1 C18 0.1F
VCC1
VCCD2 VCC1 C20 0.1F C21 0.1F
VCC1
C15 0.1F
TP2 CIM2 J12 EIN2+ J11 EIN2-
C17 0.1F R9 0
C19 0.1F
C39 0.1F
C40 0.1F
C41 0.1F
C42 0.1F
C43 0.1F
J16 DOUT2+ J15 DOUT2J17 DIN2C44 0.1F C45 0.1F C46 0.1F C47 0.1F C48 0.1F C49 0.1F C50 0.1F J18 DIN2+ VCC1
J14 EOUT2+ J13 EOUT2-
R14 20k R10 OPEN RMOD2 C64 0.1F
Figure 1. MAX3802 EV Kit Schematic _______________________________________________________________________________________ 3
MAX3802 Evaluation Kit Evaluates: MAX3802
1.0"
Figure 2. MAX3802 EV Kit Component Placement Guide--Component Side
1.0"
Figure 3. MAX3802 EV Kit Component Placement Guide--Solder Side
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MAX3802 Evaluation Kit Evaluates: MAX3802
1.0"
Figure 4. MAX3802 EV Kit PC Board Layout--Component Side
1.0"
Figure 5. MAX3802 EV Kit PC Board Layout--Ground Plane
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MAX3802 Evaluation Kit Evaluates: MAX3802
1.0"
Figure 6. MAX3802 EV Kit PC Board Layout--Power Plane
1.0"
Figure 7. MAX3802 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 _____________________ 6 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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