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19-2169; Rev 0; 9/01
MAX3980/MAX3981 Evaluation Kits
General Description
The MAX3980/MAX3981 evaluation kits (EV kits) simplify evaluation of the MAX3980/MAX3981 quad equalizer. The EV kits enable testing of all the device functions. SMA connectors with 50 controlled-impedance connections to the MAX3980/MAX3981 are provided for all input and output ports to facilitate connection to highspeed test equipment.
Features
o SMA Connectors for All High-Speed Inputs and Outputs o Fully Assembled and Tested o Single +3.3V Operation
Evaluate: MAX3980/MAX3981
Component Suppliers
SUPPLIER AVX Murata Toko PHONE 843-444-2863 415-964-6321 800-PIK-TOKO FAX 843-626-3123 415-964-8165 847-699-7864 PART MAX3980EVKIT MAX3981EVKIT
Ordering Information
TEMP RANGE 0C to +85C 0C to +85C IC PACKAGE 44 QFN-EP* 44 QFN-EP*
*Exposed pad
Note: Please indicate that you are using the MAX3980/MAX3981 when contacting these component suppliers.
Component List
DESIGNATION C1 C2, C5-C24, C27, C28 L1 QTY 1 DESCRIPTION 33F tantalum capacitor AVX TAJC336K010 0.1F 10% ceramic capacitors (0603) Murata GRM39X5R104K010 4.7H inductor Toko LL1608FH-4N7K SMA connectors (edge-mount, tab) EFJohnson 142-0701-851 2-pin headers (0.1in centers) Digi-Key S1012-36-ND 10k 1% resistor (0603) MAX3980UGH (MAX3980 EV kit) MAX3981UGH (MAX3981 EV kit) DESIGNATION VCC, GND None None None None None QTY 2 2 1 1 1 1 DESCRIPTION Test points Digi-Key 5000-ND Shunts Digi-Key S9000-ND MAX3980/MAX3981 EV kit circuit board, rev D MAX3980/MAX3981 EV kit data sheet MAX3980 data sheet (MAX3980 EV kit) MAX3981 data sheet (MAX3981 EV kit)
23
1
J1-J16
16
JP1, JP2 R5 U1
2 1 1
________________________________________________________________ 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.
MAX3980/MAX3981 Evaluation Kits Evaluate: MAX3980/MAX3981
Quick Start
1) Connect a +3.3V power supply to JH1 (VCC). Connect the power-supply ground to JH2 (GND). 2) Connect a differential signal between 200mVp-p and 800mVp-p to the inputs IN1+ and IN1- using 50 cables. 3) Terminate unused inputs with 50 terminations. 4) If not already done, remove shunt from JP2. This ensures the part is enabled and is not in the standby mode. 5) Connect signals OUT1+ and OUT1- to an oscilloscope with 50 input terminations. 6) The input signal should be a short pattern, such as 27 - 1 PRBS or K28.5, at 3.125Gbps. 7) The enable (EN) signal is available at JP2. It is pulled high with a 10k resistor on the EV board so no other pullup is necessary. To disable the equalizer, connect shunt (B) as shown in Figure 1. Otherwise, remove the shunt. 8) The SDET pin, as shown in Figure 1, indicates the presence of a signal. When a shunt (A) is connected to JP1, the equalizer will automatically be enabled when a signal is detected. Otherwise, remove the shunt.
SDET (SIGNAL DETECT, PIN 44) VCC (A) (B) JP1 JP2 10k EN (ENABLE, PIN 43) (A) SHUNT TO AUTOMATICALLY HAVE SIGNAL DETECT (SDET) ENABLE EQUALIZER (B) SHUNT TO DISABLE EQUALIZER
Figure 1. Control Functions
MAX3980 Evaluation: After the board has been checked out initially, evaluation can begin with an FR4 PC board. It is advisable to start with a board length of 20in and then progress to longer lengths. The user needs to adapt SMA connectors to the PC board. 10) MAX3981 Evaluation: After the board has been checked out initially, evaluation can begin with a twin-axial or shielded twisted-pair cable. It is advisable to start with a cable length of 5ft and then progress to longer lengths. The user needs to adapt SMA connectors to the cable.
9)
2
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MAX3980/MAX3981 Evaluation Kits Evaluate: MAX3980/MAX3981
VCC
L1 4.7H JH1 VCC C1 33F JH2 GND C2 0.1F C5 0.1F C6 0.1F C7 0.1F C8 0.1F C27 0.1F
C28 0.1F
VCC
JP1 JP2
SDET EN
R5 10k VCC
J2 OUT1VCC
44 43 42 41 40 39 38 37 36 35
J1 OUT1+ C9 0.1F
C10 0.1F
GND 34
SDET EN N.C. N.C. N.C. N.C. GND OUT1+ OUT1VCC
1
J4 IN1+ C12 0.1F J8 IN2+ C16 0.1F J12 IN3+ C20 0.1F J14 IN3C22 0.1F J10 IN2C18 0.1F J6 IN1C14 0.1F
2 3 4 5 6 7 8 9 10 11
VCC IN1+ IN1GND VCC IN2+ IN2GND VCC IN3+ IN3-
U1
OUT2+ 33 OUT2- 32 VCC 31 GND OUT3+ OUT3VCC GND OUT4+ OUT4VCC
30 29 28 27 26 25 24 23
J5 OUT2C13 0.1F J9 OUT3C17 0.1F J13 OUT4C21 0.1F
J3 OUT2+ C11 0.1F J7 OUT3+ C15 0.1F J11 OUT4+ C19 0.1F
MAX3980 MAX3981
12 GND
16 GND
14 IN4+
17 N.C.
18 N.C.
19 N.C.
20 N.C.
21 N.C.
J15 IN4+ C23 0.1F J16 IN4C24 0.1F
Figure 2. MAX3980/MAX3981 EV Kit Schematic Diagram
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22 N.C.
15 IN4-
13 VCC
3
MAX3980/MAX3981 Evaluation Kits Evaluate: MAX3980/MAX3981
1.0"
Figure 3. MAX3980/MAX3981 EV Kit Component Placement Guide--Component Side
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MAX3980/MAX3981 Evaluation Kits Evaluate: MAX3980/MAX3981
1.0"
Figure 4. MAX3980/MAX3981 EV Kit PC Board Layout--Component Side
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MAX3980/MAX3981 Evaluation Kits Evaluate: MAX3980/MAX3981
1.0"
Figure 5. MAX3980/MAX3981 EV Kit PC Board Layout--Ground Plane
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MAX3980/MAX3981 Evaluation Kits Evaluate: MAX3980/MAX3981
1.0"
Figure 6. MAX3980/MAX3981 EV Kit PC Board Layout--Power Plane
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MAX3980/MAX3981 Evaluation Kits Evaluate: MAX3980/MAX3981
1.0"
Figure 7. MAX3980/MAX3981 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.
8 _____________________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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