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| 19-2255; Rev 0; 12/01 MAX3873 Evaluation Kit General Description The MAX3873 evaluation kit (EV kit) simplifies evaluation of the MAX3873, a low-power 2.488Gbps/2.67Gbps clock recovery and data retiming IC. The EV kit enables testing of all the MAX3873 functions. SMA connectors are provided for the differential CML-compatible data and clock outputs. The differential data and clock outputs have on-board AC-coupling capacitors to allow direct connection to a high-speed oscilloscope. The MAX3873 EV kit is configured for 3.3V operation and consumes up to 150mA. 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: MAX3873 Ordering Information PART MAX3873EVKIT TEMP RANGE -40C to +85C IC PACKAGE 20 QFN-EP (4mm x 4mm) Component List DESIGNATION C1-C6, C10-C22 C7 C8 C9 C23-C26 D1 J1-J6 J9-J12 R1 L1-L4 JU1-JU5, JU9, JU11 JU6-JU8, JU10 JU6-JU8, JU10 VCC, GND U1 None None QTY 19 1 1 1 0 1 6 0 1 4 0 4 4 2 1 1 1 DESCRIPTION 0.1F 10% ceramic capacitors (0402) 0.01F 10% ceramic capacitor (0402) 33F 20% tantalum capacitor 2.2F 10% ceramic capacitor (1206) Not installed Red LED SMA connectors (edge-mount) Not installed 392 1% resistor (0402) 56nH inductors Not installed 3-pin headers (0.1in centers) Shunts Test points MAX3873EGP (20-pin QFN) 4mm x 4mm MAX3873 evaluation kit MAX3873 data sheet Detailed Description The MAX3873 EV kit is fully assembled and factory tested. It enables testing of all MAX3873 functions. Test Equipment Required * 3.3V power supply with 300mA current capability * Signal-source, 2.7Gbps minimum capability * Jitter analyzer capable of 2.7Gbps performance * Oscilloscope with at least 3GHz performance Connections The serial data inputs (SDI+, SDI-) have on-board ACcoupling capacitors. All the MAX3873 data and clock outputs (SDO+, SDO-, SCLKO+, SCLKO-) are internally terminated to 50 and have on-board AC-coupling capacitors. Configured in this way, these outputs can be directly connected to the 50 inputs of a highspeed oscilloscope for analysis. Setup 1) Select either 2.488Gbps or 2.67Gbps with JU10 (RATESET). 2) Enable/Disable FASTRACK capture mode with JU6 (FASTRACK). 3) Enable/Disable Clock output with JU8 (SCLKEN). 4) Select amplitude of CML outputs to high/medium/low with JU7 (MODE). 5) Connect a 2.488Gbps/2.67Gbps PRBS NRZ signal to (SDI+, SDI-) inputs with 50 cables. 6) Connect the (SDO+, SDO-, SCLKO+, SCLKO-) outputs to a 50 high-speed oscilloscope. Terminate unused outputs with 50. ________________________________________________________________ Maxim Integrated Products 1 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. MAX3873 Evaluation Kit Evaluates: MAX3873 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. quency design techniques, including minimizing ground inductances and using controlled-impedance transmission lines on the data and clock signals. Layout Considerations The MAX3873's performance can be greatly affected by circuit board layout and design. Use good high-fre- Jumpers and Test Points NAME JU10 JU6 JU7 JU8 TYPE 3-pin 3-pin 3-pin 3-pin DESCRIPTION Sets VCO frequency Enables quick phase lock Sets amplitude of CML outputs Enables clock output VCC 2.67Gbps Enabled Medium Enabled GND 2.488Gbps Disabled Low Disabled OPEN N/A N/A High N/A J7 VCC C8 33F C9 2.2F L1 56nH L2 56nH C10 0.1F C11 0.1F VCC_TTL J8 GND JU2 OPEN VCC_BUF C14 0.1F VCC_ANA C15 0.1F VCC_VCD C16 0.1F JU11 OPEN C7 0.01F VCC_TTL L3 56nH JU3 OPEN D1 L4 56nH C12 0.1F JU4 OPEN R1 392 JU1 OPEN 17 GND 16 SDO+ SDOVCC_BUF SCLKO+ FASTRACK VCC_VCO SCLKEN 15 14 VCC_BUF 13 12 C5 0.1F C6 0.1F J5 SMA J6 SMA C3 0.1F C4 0.1F LOL J3 SMA J4 SMA C13 0.1F VCC_TTL 20 JU10 C22 0.1F C1 0.1F C2 0.1F VCC_ANA 2 3 4 5 1 RATESET VCC SDI+ SDIGND 19 FIL+ 18 FILU1 J1 SMA J2 SMA MAX3873 6 CALSTRIP J9 SMA OPEN J11 SMA OPEN C23 OPEN C24 OPEN J10 SMA OPEN J12 SMA OPEN VCC_TTL JU9 C21 OPEN 0.1F VCC_TTL VCC 7 8 9 VCC_VCO MODE VCC SCLKO- 11 10 VCC_TTL VCC_TTL JU8 VCC_TTL JU6 C19 0.1F JU5 C17 OPEN 0.1F C18 0.1F JU7 C20 0.1F C25 OPEN C26 OPEN Figure 1. MAX3873 EV Kit Schematic 2 _______________________________________________________________________________________ MAX3873 Evaluation Kit Evaluates: MAX3873 1.0" 1.0" Figure 2. MAX3873 EV Kit Component Placement Guide-- Component Side Figure 3. MAX3873 EV Kit PC Board Layout--Component Side 1.0" Figure 4. MAX3873 EV Kit PC Board Layout--Ground Plane _______________________________________________________________________________________ 3 MAX3873 Evaluation Kit Evaluates: MAX3873 1.0" Figure 5. MAX3873 EV Kit PC Board Layout--Power Plane 1.0" Figure 6. MAX3873 EV Kit PC Board Layout--Solder Side 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 _____________________ 4 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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