19-0489; Rev 0; 3/96 MAX4108 Evaluation Kit The MAX4108 evaluation kit (EV kit) simplifies evaluation of the MAX4108 high-speed amplifier. The EV kit circuit demonstrates the MAX4108 in the noninverting, unity-gain configuration. The EV kit comes with the MAX4108 installed.To evaluate the MAX4109, simply order a free sample (MAX4109ESA), replace the MAX4108 with the MAX4109 on the EV board, and change the gain-setting resistors for the desired gain. The minimum closed-loop gain for the MAX4109 is +2V/V. ____________________________Features ♦ 400MHz Unity-Gain Bandwidth ♦ Optional Adjustable Gain ♦ Fully Assembled and Tested ______________Ordering Information PART MAX4108EVKIT-SO TEMP. RANGE +25°C BOARD TYPE Surface Mount Note: To evaluate the MAX4109, request a MAX4109ESA free sample. ____________________Component List DESIGNATION QTY U1 DESCRIPTION _________________________Quick Start 1 MAX4108ESA C3, C6 2 10µF, 10V 20% tantalum capacitors AVX TAJB106M010 Sprague 293D106X0010B C1, C2, C4, C5 4 0.1µF, 10% ceramic capacitors Vitramon VJ1206Y104KXX R1, R2 2 49.9Ω, 1% resistors RF 1 24Ω, 5% resistor IN, OUT 2 SMA connectors None 1 MAX4108 PC board None 1 MAX4108/MAX4109 data sheet The MAX4108 EV kit is fully assembled and tested. Follow these steps to verify board operation. Do not turn on the power supply until all connections are completed. 1) The circuit requires supply voltages of ±5V. Connect ±5V supplies to the corresponding pads marked VCC and VEE. Connect the power-supply ground to the pad marked GND. 2) Apply a signal between +2.5V and -3.1V to the SMA connector marked IN. 3) Connect the output marked OUT to an oscilloscope through a terminated 50Ω cable. 4) Turn on the power supply and verify the output signal on the oscilloscope. _______________Detailed Description ______________Component Suppliers SUPPLIER AVX Sprague Vishay/Vitramon PHONE (803) 946-0690 (603) 224-1961 (203) 268-6261 FAX (803) 626-3123 (603) 224-1430 (203) 452-5670 Voltage-Gain Adjustment The MAX4108 gain can be adjusted with the following minor modifications to the EV board. 1) Referring to Table 1, select the feedback (R F) and gain-setting (RG) resistors for the desired gain. 2) Install RF and RG. ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 Evaluates: MAX4108/MAX4109 _______________General Description Evaluates: MAX4108/MAX4109 MAX4108 Evaluation Kit Layout Considerations Table 1. Gain-Set Resistors GAIN RF (Ω) RG (Ω) SMALL-SIGNAL BANDWIDTH (MHz) 1 24 Open 400 MAX4108 2 270 270 225 MAX4109 5 270 68 50 MAX4109 10 270 30 25 MAX4109 VCC The MAX4108 EV kit layout has been optimized for high-speed signals and low distortion, with careful attention to grounding, power-supply bypassing, and signal-path layout. The small, surface-mount, ceramic bypass capacitors (C1, C2, C4, and C5) have been placed as close to the four MAX4108 supply pins as possible. Bypass capacitors for pins 5 and 8 must connect to a low-impedance ground. Individual power-supply traces are used to separate the MAX4108 input and output stage currents to reduce distortion. Unused pin 1 is grounded to prevent unwanted noise from coupling into the circuit. DEVICE C6 10µF 10V GND C5 0.1µF C4 0.1µF 3 IN 8 U1 R1 49.9Ω 7 6 MAX4108 2 OUT 1 R2 49.9Ω 5 4 RG OPEN C2 0.1µF C1 0.1µF RF 24Ω VEE C3 10µF 10V Figure 1. MAX4108 EV Kit Schematic 2 _______________________________________________________________________________________ MAX4108 Evaluation Kit Figure 3. MAX4108 EV Kit Component Placement Guide— Solder Side Figure 4. MAX4108 EV Kit PC Board Layout—Component Side Figure 5. MAX4108 EV Kit PC Board Layout—Solder Side _______________________________________________________________________________________ Evaluates: MAX4108/MAX4109 Figure 2. MAX4108 EV Kit Component Placement Guide— Component Side 3 Evaluates: MAX4108/MAX4109 MAX4108 Evaluation Kit 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 © 1996 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.