MAX4159 Evaluation Kit ____________________________Features ♦ 350MHz -3dB Bandwidth The EV kit comes with the MAX4159 installed. To evaluate the MAX4259, simply order a free sample (MAX4259ESD), replace the MAX4159 with the MAX4259 on the EV board, and change the gainsetting resistors for the desired gain. The MAX4259’s minimum closed-loop gain is 2V/V (6db). ♦ Directly Drives 50Ω Cables ♦ 100MHz 0.1dB Gain Flatness ♦ 700V/µs Slew Rate ♦ 0.01%/0.01° Differential Gain/Phase Error ♦ Fully Assembled and Tested ♦ Low Power: 100mW ♦ 20ns Settling Time to 0.1% ♦ 20ns Channel-Switching Time ____________________Component List ______________Ordering Information DESIGNATION QTY PART MAX4159EVKIT-SO DESCRIPTION TEMP. RANGE -40°C to +85°C BOARD TYPE Surface Mount C1, C4 2 0.1µF, 10% ceramic capacitors C2, C3 2 10µF, 10V, 20% tantalum capacitors AVX TAJB106M010 or Sprague 293D106X0010B IN0, IN1, OUT 3 SMA connectors R1, R2, R3 3 49.9Ω, 1% resistors _________________________Quick Start RF 1 430Ω, 1% resistor The MAX4159 EV kit is fully assembled and tested. Follow these steps to verify board operation. RG 0 Open SW1 1 DIP switch U1 1 MAX4159ESD None 1 MAX4159 data sheet None 1 MAX4159 PC board ______________Component Suppliers SUPPLIER PHONE FAX AVX (803) 946-0690 (803) 626-3123 Sprague (603) 224-1961 (603) 224-1430 1) Set all switches on DIP switch SW1 to the logic-low (off) position. 2) Connect the power-supply grounds to the pad marked GND. Connect a +5V supply to the pad marked V+ and a -5V supply to the pad marked V-. 3) Connect the output marked OUT to a 50Ω terminated oscilloscope input. 4) Turn on the power supply. Apply a signal of ±2.5V (max) to the SMA connector marked IN0. 5) Verify the output signal on the oscilloscope. The output amplitude will be half that on the input, due to the voltage divider formed by the 49.9Ω back-terminating resistor (R3) and the oscilloscope input termination. ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 Evaluates: MAX4159/MAX4259 _______________General Description The MAX4159 evaluation kit (EV kit) simplifies evaluation of the MAX4159 two-channel, 350MHz video multiplexer (mux) amplifier. The EV kit circuit demonstrates the MAX4159 in the noninverting unity-gain configuration. RF connectors (SMA) and 50Ω terminating resistors are included. Evaluates: MAX4159/MAX4259 MAX4159 Evaluation Kit _______________Detailed Description Layout Considerations The MAX4159 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, C4) are located as close to the MAX4159 supply pins as possible. The ground plane has been removed around and under RF and RG to reduce stray capacitance. Removing the ground plane around the input SMA connectors reduces distortion. Evaluating the MAX4259 The MAX4159 EV kit can also be used to evaluate the MAX4259. Simply replace the MAX4159 with the MAX4259 and change the gain-setting resistors for the desired gain (2V/V min). Refer to the Choosing Feedback and Gain Resistors section of the MAX4158/MAX4159/MAX4258/MAX4259 data sheet for more information. Logic Controls The MAX4159 EV kit has control logic for input channel address (A0), input latch enable (LE), and output enable (EN). DIP switch SW1 provides simple manual control of these inputs by switching each input to V+ (logic inputs default low when the circuit is open). Table 1 lists the options available with SW1. An external controller can be used by connecting the controller to the appropriate user pad and opening the corresponding switch (SW1_). A0, LE, and EN are TTL/CMOS-compatible logic-level inputs. Table 1. SW1 Settings SW1 SETTINGS LOGIC INPUTS LOGIC LOW LOGIC HIGH A0 Input channel 0 selected Input channel 1 selected LE Input address transparent Input address latched EN Output enabled Output disabled (high impedance) V+ V+ C3 10µF 10V SW1C C4 0.1µF 4 11 3 V+ 7 VC2 10µF 10V IN0 V- A0 13 A0 C1 0.1µF 3 R1 49.9Ω IN0 U1 LE 14 5 MAX4159 5 IN1 2 R2 49.9Ω 4 IN1 GND GND 8 EN V+ OUT 1 EN R3 49.9Ω 12 6 OUT 1 SW1A RF 430Ω GND 9 GND GND 2 SW1B FB 6 LE RG OPEN GND 10 ON = LOGIC HIGH OFF = LOGIC LOW Figure 1. MAX4159 EV Kit Schematic 2 _______________________________________________________________________________________ V+ MAX4159 Evaluation Kit Figure 2. MAX4159 EV Kit Component Placement Guide— Component Side Evaluates: MAX4159/MAX4259 1.0" 1.0" Figure 3. MAX4159 EV Kit Component Placement Guide— Solder Side _______________________________________________________________________________________ 3 Evaluates: MAX4159/MAX4259 MAX4159 Evaluation Kit 1.0" 1.0" Figure 4. MAX4159 EV Kit PC Board Layout—Component Side Figure 5. MAX4159 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.