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| 19-1642; Rev 0; 1/00 MAX3876 Evaluation Kit General Description The MAX3876 evaluation kit (EV kit) simplifies evaluation of the MAX3876 2.5Gbps clock-recovery and dataretiming IC. The EV kit enables testing of all MAX3876 functions. SMA connectors are provided for the differential CML data and clock outputs, as well as for system loopback functions. The MAX3876 EV kit comes configured for +3.3V operation and consumes approximately 140mA. Features o SMA Connections for All System I/Os o Test Point for Monitoring Loss-of-Lock (LOL) o Single +3.3V Power-Supply Operation o Fully Assembled and Tested Evaluates: MAX3876 Component Suppliers SUPPLIER Coilcraft PHONE 847-639-6400 FAX 847-639-1469 PART MAX3876EVKIT Ordering Information TEMP. RANGE -40C to +85C IC PACKAGE 5mm 32 TQFP Note: Please indicate that you are using the MAX3876 when contacting this component supplier. Component List DESIGNATION C1-C6, C14-C18, C21-C26, C29, C30 C7-C11 C12 C19 C20 D1 L1, L2, L3 R1 R10, R13, R17, R21 QTY 19 5 1 1 1 1 3 1 4 DESCRIPTION 0.1F, 10V min ceramic capacitors Open 1F, 10V min X7R ceramic capacitor 33F 20%, 10V min tantalum capacitor 2.2F, 10V min ceramic capacitor Red LED 56nH inductors Coilcraft 0805HS-560TKBC 392 1% resistor Open U1 None None 1 1 1 DESIGNATION R25, R28 LOL, GND, +3.3V JP10 None SDI+, SDI-, SLBI+, SLBI-, SCLKO+, SCLKO-, SDO+, SDOQTY 2 3 1 2 DESCRIPTION 0 5% resistors Test points 3-pin header (0.1in centers) Shunts 8 Edge-mount SMA connectors MAX3876EHJ (5mm 32-pin TQFP) MAX3876 evaluation kit MAX3876 data sheet ________________________________________________________________ Maxim Integrated Products 1 For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. MAX3876 Evaluation Kit Evaluates: MAX3876 Detailed Description The MAX3876 EV kit is fully assembled and factory tested. It enables testing of all MAX3876 functions. Layout Considerations The MAX3876's performance can be greatly affected by circuit board layout and design. Use good high-frequency design techniques, including minimizing ground inductances and using fixed-impedance transmission lines on the data and clock signals. Test Equipment Required * * * * +3.3V power supply with 300mA current capability Signal-source, 2.5Gbps minimum capability Jitter analyzer capable of 2.5Gbps performance Oscilloscope with at least 3GHz performance Table 1. Jumpers and Test Points NAME TYPE DESCRIPTION Used to select between the serial data input (labeled SDI EN) and the system loopback function (labeled SLBI EN) of the MAX3876 Used to monitor LOL voltage level NORMAL POSITION Connections The MAX3876 EV kit provides on-board capacitors for all data and clock I/O ports. The serial data and system loopback inputs (SDI+, SDI-, SLBI+, and SLBI-) can be connected directly to a 50 source. Additional pads for 50 pull-up resistors and 0.1F power-supply decoupling capacitors are provided on the serial data and clock outputs (SDO+, SDO-, SCLKO+, and SCLKO-). The EV kit is shipped without 50 pull-up resistors and can be connected directly to standard test equipment. For evaluation with high-impedance probes, install the 50 pull-up resistors and 0.1F decoupling capacitors. JP10 3-Pin -- LOL Test Point -- Setup 1) Select either the serial data inputs, pins 2 and 3 of JP10 (SDI EN), or the system loopback inputs, pins 1 and 2 of JP10 (SLBI EN), with jumper JP10 (Table 1). 2) Connect the +3.3V power supply to the appropriate terminals marked on the EV kit, and apply power. 3) Connect a 2.5Gbps PRBS NRZ signal to the selected inputs with 50 cables. 4) Connect the outputs to a 50 high-speed oscilloscope. Jitter analysis and product performance can also be observed by appropriately interfacing the EV kit with a bit-error-rate tester (BERT) and a jitter analyzer. Jumpers, and Test Points PLL frequency lock conditions can be monitored at the high-impedance LOL test point. A TTL high (LED off) indicates PLL frequency lock, while a TTL low (LED on) indicates a loss-of-lock condition. Note that the LOL circuitry will not detect a loss-of-power condition (refer to the MAX3876 data sheet). 2 _______________________________________________________________________________________ MAX3876 Evaluation Kit Evaluates: MAX3876 L1 56nH VCCPLL C21 0.1F C22 0.1F C29 0.1F VCCVCO C23 0.1F C24 0.1F VCCOUT C25 0.1F C26 0.1F C3 0.1F C14 0.1F C30 0.1F C15 0.1F L2 +3.3V 1 C19 33F 2 C20 2.2F 56nH L3 56nH J10 GND +3.3V R25 0 JP1 R28 0 C12 1F VCCPLL D1 C11 OPEN R1 392 LOL R10 OPEN C4 0.1F SDO+ +3.3V 32 GND 31 FIL+ 30 FIL- 29 GND 28 VCC 27 VCC 26 GND 25 LOL C7 OPEN 1 C1 0.1F VCCPLL 2 3 4 5 SDIC2 0.1F VCCPLL VCCPLL 1 SLBI EN 2 3 JP10 SDI EN JP3 6 7 8 GND GND VCC SDI+ SDIVCC SIS GND SLBI+ SLBITEST GND GND VCC VCC VCC VCC SDO+ SDOVCC VCC SCLKO+ SCLKOVCC 24 23 22 21 20 19 18 17 VCCOUT C16 0.1F SDO- SDI+ R13 OPEN +3.3V C8 OPEN U1 MAX3876 VCCOUT VCCOUT R17 OPEN C17 0.1F SCLKO+ +3.3V C9 OPEN VCCOUT C18 0.1F R21 OPEN SCLKO- 9 10 11 12 13 14 15 16 GND +3.3V C10 OPEN SLBI+ C5 0.1F VCCPLL SLBI- C6 0.1F Figure 1. MAX3876 EV Kit Schematic _______________________________________________________________________________________ 3 VCCVCO VCCPLL MAX3876 Evaluation Kit Evaluates: MAX3876 Figure 2. MAX3876 EV Kit Component Placement Guide Figure 3. MAX3876 EV Kit PC Board Layout--Component Side Figure 4. MAX3876 EV Kit PC Board Layout--Ground Plane 4 _______________________________________________________________________________________ MAX3876 Evaluation Kit Evaluates: MAX3876 Figure 6. MAX3876 EV Kit PC Board Layout--Solder Side Figure 5. MAX3876 EV Kit PC Board Layout--Power Plane _______________________________________________________________________________________ 5 MAX3876 Evaluation Kit Evaluates: MAX3876 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. 6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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