19-1151; Rev 1; 2/97 MAX4144 Evaluation Kit _______________General Description ____________________________Features ♦ 130MHz Bandwidth (-3dB) ♦ Fully Assembled and Tested ____________________Component List ______________Ordering Information DESIGNATION QTY PART MAX4144EVKIT-SO DESCRIPTION C1, C2, C3, C4 4 0.1µF, 10% ceramic capacitors Vitramon VJ1206Y104KXX C5, C6 2 10µF, 10V, 20% tantalum capacitors AVX TAJB106M010 Sprague 293D106X0010B IN+, IN-, OUT 3 SMA connectors JU1 1 3-pin header R1, R2, R3 3 49.9Ω, 1% resistors RG 1 Open U1 1 MAX4144ESD None 1 MAX4144 PC board None 1 MAX4144 data sheet None 1 Shunt for JU1 AVX Sprague Vishay/Vitramon BOARD TYPE Surface Mount _________________________Quick Start The MAX4144 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. ______________Component Suppliers SUPPLIER TEMP. RANGE +25°C PHONE FAX (803) 946-0690 (603) 224-1961 (203) 268-6261 (803) 626-3123 (603) 224-1430 (203) 452-5670 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) Verify that there is a shunt across pins 1 and 2 of jumper JU1. 3) Apply signals to IN+ and IN- whose differential voltage does not exceed ±1.5V. These signals must not exceed the amplifier’s input common-mode range of ±2.8V. 4) Connect the output marked OUT to an oscilloscope through a terminated 50Ω cable. 5) Turn on the power supply and verify the output signal on the oscilloscope. ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 Evaluates: MAX4144 The MAX4144 evaluation kit (EV kit) simplifies evaluation of the MAX4144 high-speed differential line receiver. The EV kit circuit demonstrates the MAX4144 set to a fixed gain of 2V/V. Evaluates: MAX4144 MAX4144 Evaluation Kit _______________Detailed Description Shutdown Control The MAX4144 provides a SHDN pin to disable the output. Table 1 lists the options available for the shutdowncontrol jumper, JU1. To use an external controller, completely remove the shunt on JU1 and connect the external controller to the pad labeled SHDN. SHDN is a TTL/CMOS logic-level input. Table 1. Jumper JU1 Functions 2 SHUNT LOCATION SHDN PIN 1&2 Connected to GND MAX4144 enabled 2&3 Connected to VCC Shutdown mode MAX4144 OUTPUT Reference The MAX4144 REF pin is shorted to ground on the EV board. The connection to ground can be easily broken by cutting the PC board trace between jumper JU2’s pads. The REF pad allows easy access to the REF pin. Layout Considerations The MAX4144 EV kit layout is optimized for high-speed 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, C2, C3, and C4) are placed as close to the four MAX4144 supply pins as possible. The ground plane has been removed around and under the MAX4144 to reduce stray capacitance. The removal of ground plane around the input SMA connectors reduces distortion. _______________________________________________________________________________________ MAX4144 Evaluation Kit Evaluates: MAX4144 VEE (-5V) VCC (+5V) C6 10µF 10V C5 10µF 10V U1 1 C1 0.1µF 2 INR1 49.9Ω 3 5 VCC SHDN 3 2 1 JU1 4 6 IN+ R2 VEE (-5V) 49.9Ω C2 0.1µF 7 VEE IN- N.C. MAX4144 VCC SENSE N.C. N.C. OUT SHDN N.C. IN+ REF VEE VCC 14 C4 0.1µF 13 12 R3 49.9Ω 11 OUT 10 9 8 REF VCC (+5V) JU2 C3 0.1µF Figure 1. MAX4144 EV Kit Schematic _______________________________________________________________________________________ 3 Evaluates: MAX4144 MAX4144 Evaluation Kit Figure 2. MAX4144 EV Kit Component Placement Guide— Component Side Figure 3. MAX4144 EV Kit PC Board Layout—Component Side Figure 4. MAX4144 EV Kit PC Board Layout—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 © 1997 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.