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19-1763; Rev 1; 10/01
MAX3781 Evaluation Kit
General Description
The MAX3781 evaluation kit (EV kit) is an assembled demonstration board that provides easy evaluation of the MAX3781 multiplexer/buffer. The MAX3781 EV kit provides 100 differential output terminations onboard, simplifying termination of unused outputs. o Fully Assembled and Tested o +3.3V Operation o On-Board Output Termination o Easy Selection of Operating Modes
Features
Evaluates: MAX3781
Component List
DESIGNATION C1-C24, C27-C30 C25 C26 R1, R2, R3 R4-R9 L1 U1 J1-J24 JU1, JU2, JU3 JU1, JU2, JU3 VCC, GND None None QTY 28 1 1 3 6 1 1 24 3 3 2 1 1 DESCRIPTION 0.1F 10%, 25V min ceramic capacitors (0603) 33F tantalum capacitor (C) 2.2F 10%, 25V min tantalum capacitor (B) 1k 1% resistors (0603) 100 1% resistors (0603) 4.7nH inductor TOKOLL1608-FH4N7K MAX3781UCM 48-pin TQFP-EP SMA connectors (PC mount) EFJohnson 142-0701-301 2-pin headers (0.1in centers) Digi-Key S1012-36-ND Shunts Digi-Key S9000-ND Test points Digi-Key 5000-ND MAX3781 EV kit circuit board, rev A MAX3781 data sheet SUPPLIER AVX TOKO PART MAX3781EVKIT
Ordering Information
TEMP RANGE 0C to +85C IC PACKAGE 48 TQFP-EP*
*Exposed pad
Component Suppliers
PHONE 803-946-0690 800-745-8656 FAX 803-626-3123 847-699-7864
Note: Please indicate that you are using the MAX3781 when contacting these component suppliers.
Quick Start
1) Apply +3.3V to the VCC pin. Connect power-supply ground to the GND pin. 2) Shunt jumpers JU1 (SELA), JU2 (PD), and JU3 (SELB). Refer to Table 1 in the MAX3781 data sheet for other configurations. 3) Apply up to 2.75Gbps differential data to LI2A (J17 and J18). 4) Remove R9 (differential termination resistor) from the evaluation board. 5) Connect SOA (J23 and J24) to a high-speed 50 oscilloscope.
________________________________________________________________ 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.
MAX3781 Evaluation Kit Evaluates: MAX3781
Detailed Description
Connecting CML Outputs to 50 Oscilloscopes
CML outputs have a common-mode voltage near VCC. To avoid changing this optimum common-mode voltage, all CML outputs are AC-coupled on-board with 0.1F capacitors. The CML outputs should not be connected directly through 50 to ground.
Control Lines
Jumpers JU1, JU2, and JU3 are provided to set the operating mode of the MAX3781. Shorting these jumpers pulls the corresponding TTL control line to a logical zero. All TTL control lines are internally pulled high through 15k resistors. See Table 1 for more information regarding setting operating modes.
Exposed-Pad Package
The exposed paddle (EP) 48-pin TQFP has features that provide a very low thermal resistance path for heat removal from the IC. The paddle is electrical ground on the MAX3781 and should be soldered to the circuit board for proper thermal and electrical performance.
Terminating Unused Outputs
The MAX3781 EV kit has 100 differential resistors placed across all outputs. These resistors must be removed before connecting the outputs to a 50 oscilloscope. For best performance, keep all outputs terminated, either to a 50 measurement device or to the 100 differential resistor.
Table 1. Operating Modes
SEL_ 0 0 1 1 PD 0 1 0 1 LO1_ SI_ - SI_ SI_ LO2_ SI_ SI_ SI_ - SO_ LI2_ LI2_ LI1_ LI1_
2
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MAX3781 Evaluation Kit Evaluates: MAX3781
J24 C23 0.1F J29 L1 4.7nH VCC
J23
J22 C21 0.1F
J21
J20
J19 C20 0.1F
C24 0.1F R9 100 VCC SOA+
C22 0.1F R8 100 VCC VCC LO1A+ LO1ASOAVCC VCC VCC LO2A+
C19 0.1F R7 100 VCC LO2AGND
J27 CALIBRATION STRIP J28
J25
C25 33F J30
C26 2.2F
C27 0.1F
C28 0.1F
C29 0.1F
C30 0.1F
J26
C1 0.1F J1 R1 1k R2 1k R3 1k VCC JU1 J2 C2 0.1F JU2 C3 0.1F J3 J4 C4 0.1F VCC
48 47 46 45 44 43 42 41 40 39 38 37 VCC VCC 1 2 3 4 5 6 7 8 9 10 11 12 VCC GND VCC SIASIA+ SELA PD SELB GND SIB+ SIBVCC GND VCC LI2ALI2A+ VCC LI1A+ LI1AGND GND LI1BLI1B+ VCC LI2B+ LI2BGND VCC 36 35 34 33 32 31 30 29 28 27 26 25
C18 0.1F J18 J17 VCC C17 0.1F J15 C15 0.1F C14 0.1F J14 VCC C13 0.1F C11 0.1F J13 C12 0.1F J12 J11 C16 0.1F J16
MAX3781
JU3
LO1B+
LO2B+
LO1B-
13 14 15 16 17 18 19 20 21 22 23 24 VCC VCC R4 100 C6 0.1F C5 0.1F J5 J6 C7 0.1F J7 J8 J9 R5 100 C8 0.1F R6 100 C9 0.1F C10 0.1F J10 VCC VCC
Figure 1. MAX3781 EV Kit Schematic
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LO2B-
SOB+
SOB-
VCC
VCC
VCC
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MAX3781 Evaluation Kit Evaluates: MAX3781
1.0"
Figure 2. MAX3781 EV Kit Component Placement Guide--Component Side
4
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MAX3781 Evaluation Kit Evaluates: MAX3781
1.0"
1.0"
Figure 3. MAX3781 EV Kit PC Board Layout--Component Side
Figure 4. MAX3781 EV Kit PC Board Layout--Solder Side
1.0"
1.0"
Figure 5. MAX3781 EV Kit PC Board Layout--Power Plane
Figure 6. MAX3781 EV Kit PC Board Layout--Ground Plane
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 _____________________ 5 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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