19-1585; Rev 0; 10/99 MAX4444 Evaluation Kit Features ♦ 500MHz Full-Power Bandwidth ♦ 5000V/µs Slew Rate ♦ Proven PC Board Layout ♦ Fully Assembled and Tested Surface-Mount Board Ordering Information Component List DESIGNATION QTY C1, C3 2 C2, C4 2 0.1µF ceramic capacitors R1, R2, R3 3 49.9Ω ±1% resistors R4 1 1MΩ ±5% resistor RG 0 Not installed JU1 1 2-pin header None 1 Shunt (JU1) IN-, IN+, OUT 3 SMA connectors U1 1 MAX4444ESE (16-Pin SO) None 1 MAX4444 EV kit PC board None 1 MAX4444 EV kit data sheet None 1 MAX4444/MAX4445 data sheet Component Supplier AVX TEMP. RANGE 0°C to +70°C IC PACKAGE 16 SO DESCRIPTION 4.7µF ±20%, 10V tantalum capacitors AVX TAJA475M010R SUPPLIER PART MAX4444EVKIT PHONE FAX 803-946-0690 803-626-3123 Quick Start The MAX4444 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) Connect a +5V power supply to the VCC pin and a -5V power supply to the VEE pin. Connect power-supply ground to the GND pads. 2) Ensure that the shunt is installed on 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 -2.9V to +2.9V. 4) Connect the output marked OUT to a 50Ω terminated oscilloscope input. 5) Turn on the power supply and verify the output signal on the oscilloscope. The output amplitude observed on the oscilloscope will be the same as the amplitude of the differential input. This is due to the multiplication of the gain of +2V/V with the voltage divider formed by the 49.9Ω back-terminating resistor (R3) and the oscilloscope input termination. Note: Please indicate that you are using the MAX4444 or MAX4445 when contacting the above component supplier. ________________________________________________________________ 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. Evaluate: MAX4444/MAX4445 General Description The MAX4444 evaluation kit (EV kit) simplifies evaluation of the MAX4444 ultra-fast differential line receiver. The EV kit includes the MAX4444, which has a fixed gain of +2V/V. This EV kit can also be used to evaluate the adjustable-gain MAX4445, which is stable with a minimum gain of +2V/V. To evaluate the MAX4445, order a free sample of the MAX4445ESE along with the MAX4444 EV kit. Evaluate: MAX4444/MAX4445 MAX4444 Evaluation Kit Detailed Description Table 1. Jumper JU1 Functions Enable Control Layout Considerations The MAX4444 EV kit layout has been optimized for high-speed signals, with careful attention given to grounding, power-supply bypassing, and signal-path layout. The small, surface-mount, ceramic bypass capacitors (C2, C4) have been placed as close to the MAX4444 supply pins as possible. Signal traces have been kept as short as possible by using 0805-sized termination and gain-set resistors. MAX4444 ENABLE PIN SHUNT The MAX4444 provides an enable pin (EN) to enable or disable the output. Table 1 lists the options available for the enable/disable control jumper (JU1). EN is a TTL/CMOS-logic level input. Installed Not installed MAX4444 OUTPUT Connected to VCC MAX4444 enabled Pulled to GND through 1MΩ resistor (R4) MAX4444 in shutdown Evaluating the MAX4445 To evaluate the MAX4445, turn off the power to the EV kit. Replace the MAX4444 with a MAX4445ESE, and install gain-setting resistor RG (0805, 1%) according to the following formula: RG = 600Ω / (gain - 1) Note: The gain must be at least +2V/V (RG ≤ 600Ω) for the amplifier to be stable. 1 VCC C1 4.7µF 10V C2 0.1µF 2 VCC VCC GND U1 MAX4444 3 INR1 49.9Ω 1% 4 INN.C. RG OPEN 5 6 IN+ OUT VEE VEE IN+ VEE VEE REF 8 VEE C3 4.7µF 10V C4 0.1µF 15 R3 49.9Ω 1% OUT 14 13 VEE N.C. R2 49.9Ω 1% 7 16 12 11 10 VCC VEE VEE EN JU1 9 R4 1M GND Figure 1. MAX4444 EV Kit Schematic 2 _______________________________________________________________________________________ MAX4444 Evaluation Kit Evaluate: MAX4444/MAX4445 1.0" Figure 2. MAX4444 EV Kit Component Placement Guide— Component Side 1.0" 1.0" Figure 3. MAX4444 EV Kit PC Board Layout—Component Side Figure 4. MAX4444 EV Kit PC Board Layout—Solder Side _______________________________________________________________________________________ 3 Evaluate: MAX4444/MAX4445 MAX4444 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 © 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.