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19-2346; Rev 0; 2/02
MAX3861 Evaluation Kit
General Description
The MAX3861 EV kit is a fully assembled demonstration kit that provides easy evaluation of the MAX3861 2.7Gbps +3.3V automatic gain-control amplifier. The evaluation kit also includes a calibration circuit that allows bandwidth measurements. o Fully Assembled and Tested o EV Kit Designed for 50 Interfaces
Features
o Easy 3.3V Electrical Evaluation of the MAX3861
Evaluates: MAX3861
Component Suppliers
SUPPLIER AVX Coilcraft Murata Venkel PHONE 843-448-9411 847-639-6400 814-237-1431 800-950-8365 FAX 843-448-1943 847-639-1469 814-238-0490 512-794-0087 PART MAX3861EVKIT
Ordering Information
TEMP RANGE -40C to +85C IC PACKAGE 24 QFN
Note: Please indicate that you are using the MAX3861 when ordering from these suppliers.
Component List
DESIGNATION C1-C8 C9, C12 C10, C11, C13-C17 C18 C19 C20 J1-J8 JU1 JU2-JU7, JU9 QTY 8 2 7 1 1 1 8 1 0 DESCRIPTION 0.1F 10% ceramic capacitors (0402) 0.22F 10% ceramic capacitors (0603) 0.1F 10% ceramic capacitors (0603) 2200pF 10% ceramic capacitor (0603) 2.2F 10% ceramic capacitor (1206) 33F 10% tantalum capacitor (1808) SMA connectors, edge mount 1 3-pin header (0.1in centers) 1 2-pin headers (0.1in centers) DO NOT INSTALL DESIGNATION L1, L2, L3 LED1 R1 R2, R3 R4 R5 R6, R7 TP1-TP7, VCC, GND (JU8) U1 None None QTY 3 1 1 2 1 1 2 10 1 1 1 DESCRIPTION 56nH inductors Coilcraft 1206CS-560XKBC Red LED 221 1% resistor (0603) 49.9k 1% resistors (0603) 392 1% resistor (0603) 500 potentiometer 50k potentiometers Test points MAX3861EGG 24-pin QFN* MAX3861 evaluation circuit board, rev C MAX3861 data sheet
*U1 has an exposed pad that requires it to be solder-attached to the circuit board to ensure proper part functionality.
________________________________________________________________ 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.
MAX3861 Evaluation Kit Evaluates: MAX3861
Quick Start
1) Connect a differential signal source with 100mVP-P amplitude with a 223 - 1 PRBS or K28.5 pattern to the differential inputs of the MAX3861 EV kit (J1 and J2). Set the signal source data rate to 2.7Gbps. 2) Connect OUT+ (J3) and OUT- (J4) to the 50 inputs of a high-speed oscilloscope 3) Connect a +3.3V power supply to the VCC test point, then connect the power-supply ground to the GND test point. Power-up board. 4) Adjust potentiometer R7 to set the output amplitude. Turn the potentiometer clockwise to increase amplitude.
Signal Detection Enable
Jumper JU1 sets the EN pin. To enable signal detection circuitry (SD and RSSI), shunt the top two pins of JU1 or leave the jumper open. To disable, shunt the bottom two pins.
TH Test Point
The TH test point (TP1) can be used to measure the voltage at the TH pin, or to measure the total resistance RTH to ground. Refer to the Signal Detect Threshold vs. RTH graph in the Typical Operating Characteristics section of the MAX3861 data sheet.
EN Test Point
The EN test point (TP2) is used to test the EN pin voltage. Make sure the pin has +3.3V to enable the signal detection circuitry and 0V to disable it.
Detailed Description
The MAX3861 EV kit simplifies MAX3861 evaluation. In jumper descriptions, "top" and "bottom" refer to the board positioned with the GND and VCC terminals at the top.
VREF Test Point
Use the VREF test point (TP3) to ensure VREF = 2V.
Threshold Resistor Setting
Potentiometers R5 and R6 set the signal detect threshold. The total threshold resistance RTH is the sum of R5, R6, and the 221 resistor R1. If R5 and R6 are both at maximum resistance, the threshold will be set at its minimum value. Refer to the Signal Detect Threshold vs. RTH graph in the Typical Operating Characteristics section in the MAX3861 data sheet for correct sizing.
SC Test Point
Use the SC test point (TP4) to measure the voltage on the SC pin. Refer to the Typical Operating Characteristics section of the MAX3861 data sheet.
OSM Test Point
The OSM test point (TP5) can be used to monitor the output signal strength.
Swing Control Setting
The output amplitude is controlled by potentiometer R7. If maximum output amplitude is desired, decrease R7 to its minimum value to create minimal resistance between VREF and SC. If maximum output amplitude is not desired, increase the resistance until the desired output amplitude is reached. Refer to the Output Signal Amplitude vs. SC Pin Voltage graph in the Typical Operating Characteristics section of the MAX3861 data sheet.
SD Test Point
Use the SD test point (TP6) to measure the signal detect output. This pin should indicate low (<0.4V) when the input signal falls below the threshold set at the TH pin, and indicate high (>2.4V) in normal operation.
RSSI Test Point
The RSSI test point (TP7) can be used to monitor the input signal strength.
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*JUMPER SHORTED ON BOTTOM PLANE TEST POINTS L3 56nF VCC_AUX LED1 GND JU7 VCC_OUT C14 0.1F L1 56nF JU6 C13 0.1F C16 0.1F RSSI JU4 RSSI CZ+ CZGND CD+ CDRSSI TP7 SD VCC OUT+ OUTVCC OSM VREF SC GND CG+ CGGND C4 0.1F J4 OUTSD TP6 JU5 R3 49.9k C19 2.2F C9 0.22F C10 0.1F C17 0.1F R4 392 C15 0.1F L2 56nF
C1 0.1F 3 TH TP1 VCC 3
JU9
TH
VCC_INT
Figure 1. MAX3861 EV Kit Schematic
R1 221 R5 500 31 1 2 R6 50k 31 1 2
VCC
C20 33F
GND
U1 MAX3861EGG
EXPOSED PADDLE
C3 0.1F J3 OUT+
IN+ J1 IN+ INJU1 VCC EN TP2 GND C11 0.1F EN
C2 0.1F
IN- J2
OSM TP5 EP BP JU3 BACK PLANE CONTACT TO EXPOSED PADDLE
1 1 3 TP3 JU2 SC TP4 C12 0.22F GND VREF GND 2
R7 50k 3
C18 2200pF
R2 49.9k
C5 0.1F
C7 0.1F J7
J5 CALP CALM C8 0.1F
C6 0.1F
Evaluates: MAX3861
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J8
J6
MAX3861 Evaluation Kit
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MAX3861 Evaluation Kit Evaluates: MAX3861
1.0"
Figure 2. MAX3861 EV Kit Component Placement Guide-- Component Side
1.0"
Figure 3. MAX3861 EV Kit PC Board Layout--Component Side
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MAX3861 Evaluation Kit Evaluates: MAX3861
1.0"
Figure 4. MAX3861 EV Kit PC Board Layout--Solder Side
1.0"
Figure 5. MAX3861 EV Kit PC Board Layout--Ground Plane
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MAX3861 Evaluation Kit Evaluates: MAX3861
1.0"
Figure 6. MAX3861 EV Kit PC Board Layout--Power 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.
6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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