19-1212; Rev 0; 3/97 MAX3680 Evaluation Kit The MAX3680 evaluation kit (EV kit) simplifies evaluation of the MAX3680 622Mbps, SDH/SONET 1:8 deserializer. The EV kit requires only a +3.3V supply, and includes all the external components necessary to interface with 3.3V PECL/TTL logic. The board can be connected directly to the output of a clock-and-data-recovery circuit (such as the MAX3675) and to the TTL input of an overhead termination circuit. It can also be used with a signal generator and an oscilloscope to evaluate the MAX3680’s basic functionality. ____________________________Features ♦ Single +3.3V Supply ♦ Inputs Terminated for Interfacing with 3.3V PECL ♦ Outputs Configured for 50Ω or High-Impedance Interface ♦ Fully Assembled and Tested ______________Ordering Information PART MAX3680EVKIT-SO TEMP. RANGE -40°C to +85°C BOARD TYPE Surface Mount ____________________Component List DESIGNATION QTY DESCRIPTION 4 0.1µF ceramic capacitors _______________Detailed Description C5 1 33µF, 10V tantalum capacitor AVX TAJC336K010 or Sprague 293D336X0010C2 C6 1 2.2µF tantalum capacitor AVX TAJA225K010 or Sprague 293D225X0010A2 The MAX3680 EV kit simplifies evaluation of the MAX3680 622Mbps, SDH/SONET 1:8 deserializer. The EV kit operates from a single +3.3V supply and includes all the external components necessary to interface with 3.3V PECL/TTL logic. C7–C12 6 100pF ceramic capacitors J3–J16 14 SMA connectors (PC edge mount) L1 1 56nH inductor Coilcraft 0805CS-560-XKBC R1, R3, R5, R7 4 82Ω, 5% resistors R2, R4, R6, R8 4 130Ω, 5% resistors C1–C4 R9–R17 9 2.4kΩ, 5% resistors +3.3V, GND JR9–JR17 11 2-pin headers U1 1 MAX3680EAI None 1 MAX3680 data sheet The TTL outputs (PCLK, PD_) can interface to either 50Ω or high-impedance inputs. To interface to 50Ω inputs, connect the inputs directly to the SMA connectors labeled PCLK and PD0–PD7. This configuration forms a 50-to-1 voltage divider that maintains a highimpedance load to each TTL output while interfacing to 50Ω. To interface to high-impedance inputs, connect the inputs to the 2-pin headers at R9–R17, which provide direct connections to the TTL outputs. ______________Component Suppliers SUPPLIER PHONE Each PECL input (SCLK+, SCLK-, SD+, SD-) is terminated on the EV board with the Thevenin equivalent of 50Ω to (VCC - 2V). These inputs can be driven directly by any 3.3V PECL device's output, such as a clockand-data-recovery circuit (e.g., the MAX3675). The synchronization input (SYNC) is a TTL input. FAX AVX (803) 946-0690 (803) 626-3123 Coilcraft (847) 639-6400 (847) 639-1469 Sprague (603) 224-1961 (603) 224-1430 Please indicate that you are using the MAX3680 when contacting the above component suppliers. _____________Layout Considerations To minimize propagation-delay skew, all PECL input signal lines are 50Ω transmission lines of equal length. To allow accurate characterization of the parallel-clock to data-output delay, the output data lines (prior to the series 2.4kΩ termination resistors) are matched and kept as short as possible. Excluding the series termination resistor, each output data line measures approximately 3pF at the 2-pin header (JR9–JR17). ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468. Evaluates: MAX3680 _______________General Description 2 SCLK+ SD+ J5 R6 130Ω R2 130Ω SCLK- C3 0.1µF SD- C1 0.1µF J6 VCC R5 82Ω J4 VCC R1 82Ω R8 130Ω R4 130Ω Figure 1. MAX3680 EV Kit Schematic _______________________________________________________________________________________ GND +3.3V C5 33µF 10V THIS SYMBOL REPRESENTS A TRANSMISSION LINE OF CHARACTERISTIC IMPEDANCE ZO = 50Ω VCC J3 VCC C6 2.2µF 10V C4 0.1µF C2 0.1µF PCLK L1 56nH J8 J7 R7 82Ω R3 82Ω SYNC VCC SCLK- VCC PCLK GND GND SYNC GND VCC U1 MAX3680 C8 100pF SCLK+ VCC SD- SD+ VCC VCC C7 100pF 14 13 12 11 10 9 8 7 6 5 4 3 2 1 15 16 17 18 19 20 21 22 23 24 25 26 27 C9 100pF PD0 GND PD1 VCC PD2 GND PD3 PD4 GND PD5 VCC PD6 GND PD7 28 C10 100pF R10 2.4k R12 2.4k R14 2.4k VCC C11 100pF JR8 JR6 JR4 JR2 R16 2.4k PD0 PD2 PD4 PD6 C12 100pF J16 J14 J12 J10 VCC JR7 JR5 JR3 JR1 R11 2.4k R13 2.4k R15 2.4k R17 2.4k J15 J13 J11 J9 PD1 PD3 PD5 PD7 Evaluates: MAX3680 MAX3680 Evaluation Kit MAX3680 Evaluation Kit Evaluates: MAX3680 1.0" 1.0" Figure 2. MAX3680 EV Kit Component Placement Guide 1.0" Figure 3. MAX3680 EV Kit PC Board Layout—Component Side* 1.0" Figure 4. MAX3680 EV Kit PC Board Layout—Bottom Silkscreen* Figure 5. MAX3680 EV Kit PC Board Layout—Solder Side* *Not to scale _______________________________________________________________________________________ 3 Evaluates: MAX3680 MAX3680 Evaluation Kit 1.0" 1.0" Figure 6. MAX3680 EV Kit PC Board Layout—GND Plane* Figure 7. MAX3680 EV Kit PC Board Layout— Power Plane* *Not to scale 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. 4 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 1997 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.