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19-1451; Rev 0; 3/99
MAX3866 Evaluation Kit
General Description
The MAX3866 evaluation kit (EV kit) is a fully assembled, chip-on-board (COB) electrical demonstration kit. It provides easy evaluation of the MAX3866 2.5Gbps, +3.3V combined transimpedance/limiting amplifier.
Features
o Easy +3.3V or +5.0V Electrical Evaluation of MAX3866 o Evaluation of Adjustable Loss-of-Power (LOP) o Fully Assembled and Tested o EV Kit Designed for 50 I/O Interface
Evaluates: MAX3866
Component List
DESIGNATION QTY C1, C2, C3, C5-C8 C9, J2, J3, L2, R4, R10, R11, R12, TP2, TP3 L1 R1 R2 R3, R7 R5, R8 R6 R9 CR1 INPUT (J1), OUT+ (J4), OUT- (J5) LOP VCCS, VCCD, GND VCCS U1 None None None None None 7 DESCRIPTION 100nF, 25V min, 10% ceramic capacitors (0603) Leave site open 1H inductor Coilcraft 1008CS-102 XKBB, 10% 500 potentiometer 150, 1% resistor (0402) 1k, 1% resistors (0402) 49.9, 1% resistors (0402) 1k potentiometer 1M potentiometer LED SMA connectors (edge mount) E.F. Johnson 142-0701-801 or Digi-Key J502-ND Test point Mouser 151-203 2-pin headers (0.1" centers) Digi-Key S1012-36-ND Shunt (installed) Digi-Key S9000-ND MAX3866E/D MAX3866 circuit boards, Rev. B MAX3866 data sheet MAX3866 EV kit data sheet 0.5" spacers Screws for the spacers
Ordering Information
PART MAX3866EVKIT TEMP. RANGE -40C to +85C
0
1 1 1 2 2 1 1 1 3
Component Suppliers
SUPPLIER AVX Central Semiconductor Murata Zetex PHONE 803-946-0690 516-435-1110 814-237-1431 516-543-7100 FAX 803-626-3123 516-435-1824 814-238-0490 516-864-7630
Note: Please indicate that you are using the MAX3866 when ordering from these suppliers.
Electrical Quick Start
1) Attach matched 50 SMA cables from a 50 oscilloscope to OUT+ and OUT-. Set the oscilloscope to 20mV/div and 200ps/div. A single-ended evaluation is acceptable; however, the cable not terminated into the scope should be terminated with a 50 load at the end of the cable. 2) Ensure that there is a shunt across the VCCS pins. (Remove shunt for 5.0V operation.) 3) Attach ground to either side of the GND 2-pin header and +3.3V (or +5.0V) to either side of the VCCD 2-pin header. 4) Connect a 50 cable between the output of a 50 source and the input of the EV kit. Set the source to produce a 2.0Vp-p, 2.5Gbps 1-0 pattern. 5) Adjust R9 and R6 to produce a DC current of 1mA (1mA = 2.0Vp-p / 1k / 2) through R7. This can be verified by checking for a 1V drop across R7. 6) Verify that the input pattern is present at the output.
1
1 3 1 1 2 1 1 3 6
________________________________________________________________ Maxim Integrated Products
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.
MAX3866 Evaluation Kit Evaluates: MAX3866
Adjustment and Control Description
CONTROL VCCD NAME VCCD FUNCTION/MANIPULATION Power-Supply Voltage. Both pins of this dual-pin header are the same point. Power-Supply Select Jumper. Do not apply any external voltages at this point. Both pins of this 2-pin header are not connected electrically. Depending on what the operating voltage is, either place a shunt at VCCS or remove the shunt from VCCS. When evaluating at 3.14V to 3.47V, ensure that there is a shunt on VCCS. If the evaluation voltage is 5.0V to 5.5V, remove this shunt and place a 100nF capacitor in location C8. (EV kit is shipped with 100nF in the C8 location; see Figure 1.) Single-Ended Input, 3mVp-p to 2.5Vp-p range. This translates into a current of 3A to 2.5mA, respectively (voltage at input) / (R3 = 1k). Note that the EV kit input is terminated for a 50 source. Signal Outputs (AC-coupled). Note that the EV kit outputs are designed for 50 termination. Sets the LOP Threshold. For normal operation, Maxim recommends R8 + R1 = 510. However, if other values are desired, please refer to the Typical Operating Characteristics section (Assert/Deassert vs. RPD) of the MAX3866 data sheet. Micro and Macro Current Adjustment. Simulates the average DC current portion of a diode. The amount of current that should be set through these potentiometers is calculated by the formula (AC current into MAX3866) / 2 = DC bias current. LOP is active high. Therefore, when an LOP condition exists, the LED will be off. Solder Jumper. For normal operation, ensure that this solder jumper is open. TTL Output, active high. Probe this test point only with a high-impedance lead.
VCCS
VCCS
J1
INPUT
J4, J5
OUTP, OUTM
R1
--
R6, R9
--
CR1 SJ2 TP1
DIODE -- LOP
2
_______________________________________________________________________________________
ZTEST1 J2 SMA F ZO = 50 1 C9 OPEN R12 OPEN VCCS VCCD 1 2 C7 100nF C8 100nF 1 L2 OPEN 2 R9 1M 3 2 CHFCHF+ VCCS VCCS LOP GND GND VCCD VCCD LOP FILC1 100nF GND P2 (C8 IS NOT REQUIRED IN 3.3V OPERATION.) 2 1 VCCD P1 (3.13V... 3.47V OR 4.5V....5.5V) 2 R11 OPEN ZTEST2 J3 SMA 1 F
Figure 1. MAX3866 EV Kit Schematic
1 1 3 2 L1 1H R6 1k R2 150 CR1 DIODE VCCD
2
R10 OPEN
SJ2 SOLDER JUMPER OPEN
INPUT J1 SMA F 1
C3 100nF
R7 1k
U1
GND OUT+ IN+ R3 1k
GND
C5 100nF 1
OUT+ J4 SMA 2 OUTJ5 SMA
2
MAX3866
INGND N.C. PDC INV GND GND GND
R5 50 LINE TERMINATION
OUTGND CPD- CPD+ GND R4 OPEN C6 100nF
1
2
R8 50 C2 100nF 2 1 R1 500 3
Evaluates: MAX3866
_______________________________________________________________________________________
MAX3866 Evaluation Kit
3
MAX3866 Evaluation Kit Evaluates: MAX3866
1.0"
Figure 2. MAX3866 EV Kit Component Placement Guide-- Component Side
4
_______________________________________________________________________________________
MAX3866 Evaluation Kit Evaluates: MAX3866
1.0"
Figure 3. MAX3866 EV Kit PC Board Layout--Component Side
1.0"
Figure 4. MAX3866 EV Kit--Ground Plane
_______________________________________________________________________________________
5
MAX3866 Evaluation Kit Evaluates: MAX3866
1.0"
Figure 5. MAX3866 EV Kit--Power Plane
1.0"
Figure 6. MAX3866 EV Kit PC Board Layout--Solder Side
6
_______________________________________________________________________________________
MAX3866 Evaluation Kit Evaluates: MAX3866
HF23Z
1.0"
Figure 7. MAX3866 EV Kit--Bond Diagram
_______________________________________________________________________________________
7
MAX3866 Evaluation Kit Evaluates: MAX3866
NOTES
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) 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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