_______________general description the max4159 evaluation kit (ev kit) simplifies evalua- tion of the max4159 two-channel, 350mhz video multi- plexer (mux) amplifier. the ev kit circuit demonstrates the max4159 in the noninverting unity-gain configura- tion. rf connectors (sma) and 50 terminating resis- tors are included. the ev kit comes with the max4159 installed. to evalu- ate the max4259, simply order a free sample (max4259esd), replace the max4159 with the max4259 on the ev board, and change the gain- setting resistors for the desired gain. the max4259? minimum closed-loop gain is 2v/v (6db). ____________________________features ? 350mhz -3db bandwidth ? 100mhz 0.1db gain flatness ? 700v/? slew rate ? 0.01%/0.01 differential gain/phase error ? directly drives 50 cables ? fully assembled and tested ? low power: 100mw ? 20ns settling time to 0.1% ? 20ns channel-switching time _________________________quick start the max4159 ev kit is fully assembled and tested. follow these steps to verify board operation. 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 50 termi- nated oscilloscope input. 4) turn on the power supply. apply a signal of ?.5v (max) to the sma connector marked in0. 5) verify the output signal on the oscilloscope. the out- put amplitude will be half that on the input, due to the voltage divider formed by the 49.9 back-terminating resistor (r3) and the oscilloscope input termination. evaluates: max4159/max4259 max4159 evaluation kit ________________________________________________________________ maxim integrated products 1 part MAX4159EVKIT-so qty description c1, c4 2 c2, c3 2 in0, in1, out 3 sma connectors r1, r2, r3 3 rf 1 430 , 1% resistor rg 0 sw1 1 u1 1 none 1 max4159 data sheet none 1 max4159 pc board 49.9 , 1% resistors 10?, 10v, 20% tantalum capacitors avx tajb106m010 or sprague 293d106x0010b 0.1?, 10% ceramic capacitors supplier phone fax avx (803) 946-0690 (803) 626-3123 ______________component suppliers designation open dip switch max4159esd ____________________component list ______________ordering information for free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 temp. range -40? to +85? board type surface mount sprague (603) 224-1961 (603) 224-1430
evaluates: max4159/max4259 max4159 evaluation kit 2 _______________________________________________________________________________________ _______________ detailed description 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 con - troller 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-compati - ble logic-level inputs. 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 r f and r g to reduce stray capacitance. removing the ground plane around the input sma connectors reduces distortion. table 1. sw1 settings logic inputs a0 input channel 0 selected input channel 1 selected le input address transparent input address latched gnd in1 in0 r1 49.9 w r2 49.9 w r3 49.9 w c1 0.1 m f c4 0.1 m f c2 10 m f 10v c3 10 m f 10v v- 7 11 3 5 v+ v- in0 in1 gnd v+ 10 9 1 4 5 3 sw1c 2 sw1b r f 430 w r g open 6 out 1 sw1a a0 le v+ v+ v+ gnd gnd gnd 2 12 14 13 4 6 8 en out le a0 fb gnd on = logic high off = logic low en u1 max4159 figure 1. max4159 ev kit schematic en output enabled output disabled (high impedance) logic low logic high sw1 settings
evaluates: max4159/max4259 max4159 evaluation kit _______________________________________________________________________________________ 3 figure 3. max4159 ev kit component placement guide solder side figure 2. max4159 ev kit component placement guide component side 1.0" 1.0"
maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it 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. evaluates: max4159/max4259 max4159 evaluation kit figure 4. max4159 ev kit pc board layout?omponent side figure 5. max4159 ev kit pc board layout?older side 1.0" 1.0"
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