19-0373; Rev 1; 12/98 MAX497 Evaluation Kit ____________________________Features The MAX497 evaluation kit (EV kit) simplifies the evaluation of the MAX496 and MAX497 quad video buffers. RF-style connectors (SMA) and 75Ω terminating resistors are included for video test equipment compatibility. The evaluation board comes with the MAX497 installed, but can also be used to evaluate the MAX496. Simply contact Maxim’s Sample Department to order a MAX496CSE free sample, and replace the MAX497 with the MAX496; no other changes are necessary. ♦ 375MHz -3dB Bandwidth (MAX496) 275MHz -3dB Bandwidth (MAX497) ♦ Low Differential Gain/Phase Error: 0.01%/0.01° ♦ 1500V/µs Slew Rate (MAX497) ♦ 5.6nV/√Hz Input-Referred Voltage Noise ♦ Directly Drives 50Ω/75Ω Back-Terminated Cable ♦ Fully Assembled and Tested ♦ ±5V Supply ____________________Component List DESIGNATION QTY _______________Ordering Information DESCRIPTION C1, C2 2 10µF, 10V, 20% tantalum capacitors Sprague 293D106X0016B or AVX TAJB106M016 C3–C6 4 0.1µF ceramic capacitors Vitramon VJ1206Y104KXX IN0–IN3, OUT0–OUT3 8 SMA connectors R1–R8 8 75Ω, 5% resistors _________________________Quick Start U1 1 MAX497CSE None 1 MAX496/MAX497 PC board The MAX497 EV kit is fully assembled and tested. Follow these steps to verify board functionality. Do not turn on the power supply until all connections are completed. 1) The circuit requires 5V supply voltages. Connect the +5V supply to the pad marked VCC, and the -5V supply to the pad marked VEE. Connect power-supply ground to the pad marked GND. 2) Connect a 75Ω cable from a signal source to the input marked IN0. 3) Connect the output marked OUT0 to an oscilloscope through a terminated 75Ω cable. 4) Turn on the power supply, apply a 1.25V (maximum) signal, and verify the output signal on the oscilloscope. AVX Sprague Vishay/Vitramon PHONE (803) 946-0690 (603) 224-1961 (203) 268-6261 TEMP. RANGE 0°C to +70°C BOARD TYPE Surface Mount Note: To evaluate the MAX496, request a MAX496CSE free sample. ______________Component Suppliers SUPPLIER PART MAX497EVKIT-SO FAX (803) 626-3123 (603) 224-1430 (203) 452-5670 _______________ Detailed Description The MAX496/MAX497 operate from 5V supplies. SMA jacks are provided for all input and output signals. The MAX496 allows ±2.5V input signal levels and the MAX497 accepts levels to ±1.25V. ________________________________________________________________ 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 1-800-835-8769. Evaluates: MAX496/MAX497 ________________ General Description Evaluates: MAX496/MAX497 MAX497 Evaluation Kit Driving Coaxial Cable Layout Considerations The MAX497 EV kit is designed to drive a terminated 75Ω video cable. The back-termination resistor is included to match the impedance of the cable’s driven end to the characteristic impedance of the cable itself. For 50Ω systems, replace the 75Ω termination resistors (R1–R8) with 50Ω resistors. This, along with the load termination resistor, eliminates signal reflections from the cable’s ends. The back-terminating resistor forms a voltage divider with the load impedance, which attenuates the signal at the cable’s output by one-half. The MAX497 operates with a 2V/V closed-loop gain to provide unity gain at the cable’s output. With the MAX496 installed, the overall gain is reduced to one-half the input signal when driving a terminated cable. The MAX497 evaluation board layout is optimized for high-speed signals, giving careful attention to grounding, power-supply bypassing, and signal-path layout. The small, surface-mount ceramic bypass capacitors C3–C6 have been placed as close to the MAX497 supply pins as possible. Back-termination resistors were placed as close to the MAX496/MAX497 as possible to isolate board capacitance. For further layout recommendations, refer to the Grounding and Layout section of the MAX496/MAX497 data sheet. 1 2 IN0 R1 75Ω 3 4 IN1 R2 75Ω 5 6 IN2 R3 75Ω 7 8 IN3 R4 75Ω OUT0 GND IN0 GND IN1 GND IN2 VCC U1 MAX497 OUT1 VEE OUT2 VEE GND OUT3 IN3 VCC R5 75Ω 16 15 OUT0 VCC C6 0.1µF OUT1 VEE C5 0.1µF VEE R7 75Ω 12 11 C1 10µF 10V R6 75Ω 14 13 VCC C2 10µF 10V OUT2 VEE C4 0.1µF R8 75Ω 10 GND OUT3 9 C3 0.1µF VCC Figure 1. MAX497 EV Kit Schematic 2 _______________________________________________________________________________________ MAX497 Evaluation Kit Figure 3. MAX497EV Kit Component Placement Guide— Solder Side Figure 4. MAX497EV Kit PC Board Layout—Component Side Figure 5. MAX497EV Kit PC Board Layout—Solder Side _______________________________________________________________________________________ Evaluates: MAX496/MAX497 Figure 2. MAX497EV Kit Component Placement Guide— Component Side 3 Evaluates: MAX496/MAX497 MAX497 Evaluation Kit 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. 4 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.