19-1369; Rev 0; 7/98 MAX4188 Evaluation Kit ____________________________Features ♦ Fast Enable/Disable Times (120ns/35ns) ____________________________Component List _______________Ordering Information DESIGNATION QTY DESCRIPTION C1, C4 2 10µF, 10V, 20% tantalum capacitors AVX TAJB106M010 or Sprague 293D106X0010B C2, C5 2 0.33µF, 10% ceramic capacitors C3, C6 2 0.01µF, 10% ceramic capacitors R1–R6 6 49.9Ω, 1% resistors RF1, RF2, RF3, RG1, RG2, RG3 6 390Ω, 1% resistors ♦ Single +5V or Dual ±5V Supply Operation ♦ 130MHz -3dB Bandwidth ♦ 350V/µs Slew Rate ♦ 70MHz -0.1dB Gain Flatness ♦ 0.04%/0.32% Gain/Phase Errors (RL = 150Ω) ♦ Fully Assembled and Tested Surface-Mount Board PART** MAX4188EVKIT TEMP. RANGE -40°C to +85°C IC PACKAGE 14 SO **To evaluate the MAX4189, request a MAX4189ESD sample. Quick Start IN1+, IN2+, IN3+, OUT1, OUT2, OUT3 6 SMA connectors JU1, JU2, JU3 3 2-pin header The MAX4188 EV kit is fully assembled and tested. Follow these steps to verify board operation. 1) The circuit requires supply voltages of ±2.25V 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 power-supply ground to the pad labeled GND. U1 1 MAX4188ESD None 1 MAX4188 EV kit PC board None 3 Shunts for JU1, JU2, JU3 Component Suppliers SUPPLIER* ♦ Very Low Switching Transient (45mVp-p) PHONE FAX AVX (803) 946-0690 (803) 626-3123 Sprague (603) 224-1961 (603) 224-1430 2) Connect an output (OUT1–OUT3) to an oscilloscope input. Remove shunt from the corresponding jumper (JU1–JU3) to enable the selected amplifier. 3) Turn on the power supply. Apply a ±1.35V signal to the appropriate amplifier input (IN1–IN3). The 100Ω load (chosen for ease of evaluation) limits the output voltage range. Wider output voltage swings are achievable with lighter loads. See the MAX4188/ MAX4189/MAX4190 data sheet. 4) Verify the output signal on the oscilloscope. *Please indicate that you are using the MAX4188 when contacting these component suppliers. ________________________________________________________________ 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: MAX4188/MAX4189 General Description The MAX4188 evaluation kit (EV kit) simplifies evaluation of the MAX4188 triple, low-power, current-feedback amplifier. The MAX4188 amplifier is set to a gain of +2V/V. SMA connectors and 50Ω terminating resistors are included for 50Ω test equipment compatibility. For video test equipment compatibility, simply change the terminating resistors to 75Ω and change RF and RG resistors to the values shown in the MAX4188/ MAX4189/MAX4190 data sheet. The EV kit comes with the MAX4188 installed. To evaluate the MAX4189, order a free sample (MAX4189ESD), replace the MAX4188 with the MAX4189 on the EV board, and change the gain-setting and feedback resistors for unity gain as shown in the MAX4188/MAX4189/ MAX4190 data sheet. Evaluates: MAX4188/MAX4189 MAX4188 Evaluation Kit _______________Detailed Description Setting the Voltage Gain The gain of the MAX4188’s amplifiers can be individually set by changing the appropriate feedback (RF) and gain-set (RG) resistors. For example, the gain of amplifier 1 can be set using resistors RF1 and RG1. Refer to the MAX4188/MAX4189 data sheet for recommended values. Enable/Disable Control The MAX4188 provides DISABLE pins to enable or disable each of the three outputs and isolate the amplifiers from the external inputs. Jumpers JU1–JU3 can be used to manually control each DISABLE pin. An external controller may also be used by connecting the controller to the appropriate disable pad (DISABLE_) and removing the corresponding jumper shunt. The amplifiers default to the enable mode if the DISABLE pin is left floating/ unconnected. For a single +5V supply or dual ±5V supplies, the DISABLE inputs are CMOS-logic compatible. The logic threshold is VCC - 2.5V. 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 (C2, C3, C5, C6) have been placed as close to the amplifier’s supply pins as possible. 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 feedback and gain-set resistors. OUT2 DISABLE1 1 DISABLE2 JU1 2 DISABLE3 3 JU2 2 DISABLE1 R6 49.9Ω 14 IN2- 13 IN2+ 12 OUT2 RF2 390Ω RG2 390Ω DISABLE2 DISABLE3 IN2+ R5 49.9Ω JU3 MAX4188 4 VCC C1 10µF 10V VCC VEE 5 IN1+ IN1+ IN3+ IN1- RF1 390Ω IN3- 1 7 R2 49.9Ω C4 10µF 10V IN3+ R4 49.9Ω 6 OUT1 C5 0.33µF 10 R1 49.9Ω RG1 390Ω VEE C6 0.01µF C3 0.01µF C2 0.33µF 11 OUT1 9 RF3 390Ω 3 OUT3 RG3 390Ω 8 OUT3 R3 49.9Ω Figure 1. MAX4188 EV Kit Schematic 2 _______________________________________________________________________________________ MAX4188 Evaluation Kit 1.0" Figure 2. MAX4188 EV Kit Component Placement Guide— Component Side Figure 3. MAX4188 EV Kit PC Board Layout—Component Side _______________________________________________________________________________________ 3 Evaluates: MAX4188/MAX4189 1.0" Evaluates: MAX4188/MAX4189 MAX4188 Evaluation Kit 1.0" 1.0" Figure 4. MAX4188 EV Kit PC Board Layout—Solder Side Figure 5. MAX4188 EV Kit Component Placement Guide— 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. 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.