19-1281; Rev 0; 8/97 MAX4223 Evaluation Kit ____________________________Features ♦ 1GHz -3dB Bandwidth The MAX4223 EV kit uses a PC board design optimized for high-frequency amplifiers. This board can also be used to evaluate the MAX4224 and other Maxim amplifiers that share the same pinout . ♦ Optional Adjustable Gain ____________________Component List DESIGNATION QTY DESCRIPTION C1, C2 2 0.1µF, 10% ceramic capacitors C3, C4 2 10µF, 10V, 20% tantalum capacitors AVX TAJB106M010 or Sprague 293D106X0010B R1, R2 2 49.9Ω, 1% resistors RF 1 560Ω, 5% resistor RG 0 Open IN, OUT 2 SMA connectors U1 1 MAX4223ESA JU1 1 3-pin header None 1 Shunt for JU1 None 1 PC board None 1 MAX4223 data sheet PHONE ♦ 1100V/µs Slew Rate ♦ ±5V Supply Operation ♦ High-Impedance Shutdown Mode ♦ Fully Assembled and Tested ______________Ordering Information PART TEMP. RANGE BOARD TYPE MAX4223EVKIT-SO -40°C to +85°C Surface Mount Note: To evaluate the MAX4224, request a MAX4224ESA free sample. _________________________Quick Start The MAX4223 EV kit is fully assembled and tested. Follow these steps to verify board operation. 1) The circuit requires supply voltages of ±2.85V to ±5.5V. For evaluation purposes, connect a +5V supply to the pad labeled VCC and a -5V supply to the pad labeled VEE. Connect the power-supply ground to the pad labeled GND. ______________Component Suppliers SUPPLIER ♦ 300MHz 0.1dB Gain Flatness FAX AVX (803) 946-0690 (803) 626-3123 Sprague (603) 224-1961 (603) 224-1430 Note: Please indicate that you are using the MAX4223 when contacting these component suppliers. 2) Verify that the shunt is across pins 1 and 2 of jumper JU1. 3) Connect the output labeled OUT to an oscilloscope input. For best performance, terminate the output with a 50Ω load. 4) Turn on the power supply. Apply a signal of ±2.5V maximum to the SMA connector labeled IN. 5) Verify the output signal on the oscilloscope. Note: When using a 50Ω-terminated oscilloscope input, the output amplitude observed will be half that of the input, due to the voltage divider formed by the 49.9Ω back-terminating resistor (R1) and the oscilloscope input termination impedance. ________________________________________________________________ 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: MAX4223/MAX4224 _______________General Description The MAX4223 evaluation kit (EV kit) simplifies evaluation of the 1GHz, low-power MAX4223 current-feedback amplifier. The EV kit circuit demonstrates the MAX4223 in the noninverting unity-gain configuration. RF-style connectors (SMA) and 50Ω terminating resistors are included for test equipment compatibility. Evaluates: MAX4223/MAX4224 MAX4223 Evaluation Kit _______________Detailed Description Shutdown Control The MAX4223 provides a shutdown pin (SHDN) to enable or disable the output. Table 1 lists the options available for the shutdown control jumper, JU1. To use an external controller, remove the shunt on JU1 completely and connect the external controller to the pad labeled SHDN. SHDN is a TTL/CMOS logic-level input. MAX4223 SHDN PIN MAX4223 OUTPUT 1&2 Connected to VCC Enabled 2&3 Connected to GND Disabled 1 Layout Considerations The PC board layout has been optimized for highspeed signals and low distortion, with careful attention given to grounding, power-supply bypassing, and signal-path layout. The small, surface-mount, ceramic bypass capacitors (C1 and C2) have been placed as close to the amplifier’s supply pins as possible. The ground plane has been removed around and under the amplifier to reduce stray capacitance. Capacitance at the inverting input pins has been minimized by reducing the length and width of the input and feedback traces, and by using 0805-size surface-mount feedback and gain-set resistors. Table 1. Jumper JU1 Functions SHUNT LOCATION Voltage Gain Adjustment The MAX4223 is optimized for applications requiring a gain of +1 (0dB) or greater. Its gain can be set by changing the feedback (RF) and gain-set (RG) resistors. For improved performance at a gain of +2 (6dB) or greater, replace the MAX4223 with a free sample of the MAX4224. Refer to the MAX4223–MAX4228 data sheet for recommended feedback-resistor values. N.C. SHDN 8 3 2 JU1 SHDN 1 2 IN- MAX4223 VCC 7 RG OPEN VCC C2 0.1µF OUT 3 IN C4 10µF 10V 6 IN+ OUT R1 49.9Ω R2 49.9Ω 4 VEE C3 10µF 10V VEE N.C. 5 C1 0.1µF RF 560Ω Figure 1. MAX4223 EV Kit Schematic 2 _______________________________________________________________________________________ MAX4223 Evaluation Kit Evaluates: MAX4223/MAX4224 1.0" Figure 2. MAX4223 EV Kit Component Placement Guide 1.0" 1.0" Figure 3. MAX4223 EV Kit PC Board Layout—Component Side Figure 4. MAX4223 EV Kit PC Board Layout—Solder Side _______________________________________________________________________________________ 3 Evaluates: MAX4223/MAX4224 MAX4223 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 © 1997 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.