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19-0019; Rev 0 ; 8/04
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The MAX3746 evaluation kit (EV kit) simplifies evaluation of the MAX3746 limiting amplifier. The EV kit allows for quick threshold level selections, provides a RSSI output signal (when used with the MAX3744) and includes a calibration circuit. The MAX3746 EV kit is fully assembled and tested.

Fully Assembled and Tested Test Point for Easy Monitoring of LOS Polarity Reversal Control Jumpers Allow Quick Selection for Loss of Signal Threshold Level
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DESIGNATION C1, C2, C7, C10
C3, C4, C6, C8, C9, C11, C14-C18
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IC PACKAGE 16 QFN
QTY 4 12 1 1 1
DESCRIPTION 1000pF 10% 10V min ceramic capacitor (0201) 0. 1 F, 10% 10V min ceramic capacitor (0402) 2.2F, 10%, 10V min ceramic capacitor (0805) 33F 10V min 5% tantalum Capacitor (CASE B) 30.1k , 1% resistor (0402) 2k , 1% resistor (0402)
PART MAX3746EVKIT
TEMP. RANGE -40C to +85C
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SUPPLIER AVX Coilcraft Murata PHONE 843-444-2863 847-639-6400 415-964-6321 FAX 843-626-3123 847-639-1469 415-964-8165
C20 C21 R1 R3 R4 R5 R6 R7 R8 L1 JU2-JU5, JU9, JU6, JU7 JU8 TP2, TP3, TP9, TP10 JU2-JU9 J1-J8 U1
Note: Please indicate that you are using the MAX3746 when ordering from these suppliers.
1 1 1 1 1 1 5 3 1 4 8 8
14k , 1% resistor (0402) 24.9k , 1% resistor (0402) 4.75k , 1% resistor (0402) 10k , 1% resistor (0402) 3.01k , 1% resistor (0402) 1.2H, 5% Chip inductor (Coilcraft 1008LS) Jumper blocks, 2 Pins 0.1" spacing Jumper blocks, 3 Pins 0.1" spacing Jumper block, 3 Pins +1 Pin 0.1" Test point Digikey 5000KND Shunts SMA edge mount tab Johnson 142-0701-851 MAX3746EGE MAX3746 Rev A Evaluation Circuit Board
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_________________________________________________________________Maxim Integrated Products
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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
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Connect OUT+ and OUT- to a 50 terminated oscilloscope. Connect IN+ and IN- to a 500mVP-P, 3.2Gbps differential data stream. Remove all shunts. Shunt JU8 to VCC so that there is no inversion of signal polarity. (OUTPOL, VCC). Figure 2 shows the jumper diagram for the board. Shunt JU4 connecting R3 = 13k (RTH). Shunt JU6 connecting R7 = 10k (RLOS). Shunt JU5 connecting pin LOS to DISABLE.
8) Connect TP2 to VCC.
Connect the power-supply ground to the GND pad and then connect a +3.3V power supply to the VCC. 10) Observe a limited signal at the output, roughly 0.8Vp-p. 11) Lower the amplitude of the input signal from 500mVp-p to 15mVp-p or less. The output signal is squelched.
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FUNCTION Selects loss of signal assert/deassert level.
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NAME JU2, JU3, JU4 JU5
Shunt to connect the LOS pin to the DISABLE pin (Squelch) Shunt to connect series resistor from LOS to test point TP2. Make sure TP2 is connected to a positive supply. Disable. Shunting to VCC holds the outputs static. Shunt center pin (OUTPOL) to VCC for full-swing non-inverted output signal. Shunt to GND to have an inverted full-swing output. Leave open for reduced-amplitude non-inverted output. Connect to 30k for reduced-amplitude inverted output signal. Shunt to connect RSSI output to RSSI resistor R8.
JU6 JU7
JU8
JU9
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L1 1.2H VCC C21 + 33F C20 2.2F
V CC C18 0.1F
GND C11 0.1F JU9 J1 IN+ C4 0.1F C1 0.001F J2 INC3 0.1F C6 = 0.1uF C2 0.001F
GND NC NC RSSI
R8 3.01k
TP10 TP9
V CC C9 0.1F
V CC
IN+ IN-
V CC
C10 0.001F
OUT+
MAX3746
U1
DIS LOS
OUT-
C8 0.1F
V CC
TH
OUTPOL GND
JU5 JU7
TP3
JU8
C7 0.001 F
J3 OUT-
JU6
TP2
J6
C14 0.1F C16 0.1F J7
J5 C15 0.1F
C17 0.1F
J8
Figure 1. MAX3746 electrical schematic.
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MAX3746 JUMPER DIAGRAM
RSSI JU9
JU4 RTH= 2k RTH= 13k RTH= 25k JU3 JU2
LOS-DISABLE Connect JU7 JU6 JU8 GND OUTPOL 30k VCC R6 =10k (top) R7 =4.75k(bottom) Disable Outputs not reversed. Full signal swing.
JU5
TP2 - Connect to VCC to power LOS circuitry Outputs Enabled. Use only when LOS-DISABLE not connected
Figure 2. Jumper Diagram.
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Figure 3. MAX3746 EV Kit Component Placement Guide - Component Side (2X)
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Figure 4. MAX3746 EV Kit PC Board Layout - Component Side (2X)
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Figure 5. MAX3748A EV Kit PC Board Layout - Ground Plane (2X)
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Figure 6. MAX3746 EV Kit PC Board Layout - Power Plane (2X)
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Figure 7. MAX3746 EV Kit PC Board Layout - Solder Side (2X)
Maxim makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Maxim assume any liability arising out of the application or use of any product or circuit and specifically disclaims any and all liability, including without limitation consequential or incidental damages. "Typical" parameters can and do vary in different applications. All operation parameters, including "typicals" must be validated for each customer application by customer's technical experts. Maxim products are not designed, intended or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Maxim product could create a situation where personal injury or death may occur.
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 ___________________ 9
(c) 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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