general description the max4447 evaluation kit (ev kit) simplifies evaluation of the max4447 high-speed differential line driver. the ev kit includes the max4447, which has a fixed gain of +2v/v, but it can also be used to evaluate the adjustable-gain max4448 (stable with a minimum gain of +2v/v) or the max4449 (stable with a minimum gain of +5v/v). to evaluate the max4448 or max4449, order a free sample of the max4448ese or max4449ese along with the max4447 ev kit. features ? 430mhz full-power bandwidth (max4447) ? 6500v/s slew rate ? proven pc board layout ? fully assembled and tested surface-mount board evaluates: max4447/max4448/max4449 max4447 evaluation kit 19-1584; rev 0; 10/99 component list 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. quick start the max4447 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 v cc pin and a -5v power supply to the v ee pin. connect power- supply ground to the gnd pads. 2) ensure that the shunt is removed from jumper ju1. 3) apply a signal of up to +1.5v peak to the sma connector marked in. 4) connect the output marked out+ to a 50 terminated oscilloscope input, and connect the output marked out- to another 50 terminated oscilloscope input. 5) turn on the power supply and verify the output sig- nals on the oscilloscope. the output amplitude at either of the two outputs (vout+, vout-) observed on the oscilloscope will be the same as that on the input. this is due to the multiplication of the +2 gain with the voltage divider formed by the 49.9 back-ter- minating resistor (r3) and the oscilloscope input termi- nation. note that the differential output (defined as vout+ - vout-) will be twice the amplitude of the input. component suppliers note: please indicate that you are using the max4447, max4448, or max4449 when contacting the component supplier above. supplier avx 803-946-0690 phone fax 803-626-3123 none 1 max4447/max4448/max4449 data sheet qty description c1, c3 2 4.7f 20%, 10v tantalum capacitors avx taja475m010r c2, c4 2 0.1f ceramic capacitors r1, r2, r3 3 49.9 1% resistors rg 0 not installed designation ju1 1 2-pin header none 1 shunt (ju1) in, out-, out+ 3 sma connectors u1 1 max4447ese none 1 max4447 ev kit pc board none 1 max4447 ev kit data sheet ________________________________________________________________ maxim integrated products 1 max4447evkit part temp. range 0c to +70c 16 so ic package ordering information
evaluates: max4447/max4448/max4449 max4447 evaluation kit 2 _______________________________________________________________________________________ detailed description enable control the max4447 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. layout considerations the max4447 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 max4447 supply pins as possible. signal traces have been kept as short as possible by using 0805-sized ter- mination and gain-set resistors. evaluating the max4448 or max4449 to evaluate the max4448 or max4449, turn off the power to the ev kit. replace the max4447 with a max4448ese or max4449ese, and install a gain-set- ting resistor r g (0805, 1%) according to the following formula: note that the gain must be at least +2v/v for the max4448 and must be at least +5v/v for the max4449 for the amplifier to be stable. r= 300 g / 2 - 1 g w table 1. jumper ju1 functions shunt max4447 enable pin max4447 output installed connected to gnd max4447 in shutdown not installed floating (internally pulled up) max4447 enabled 16 15 out- 10 9 1 2 3 4 r g open r3 49.9 w 1% r2 49.9 w 1% ju1 c2 0.1 m f r1 49.9 w 1% c1 4.7 m f 10v 5 6 7 8 u1 max4447 c4 0.1 m f c3 4.7 m f 10v out+ v cc gnd out- shdn out+ vcc v ee vee gnd in v cc n.c. n.c. n.c. in v ee 14 11 v ee v ee v ee v ee 13 12 vee figure 1. max4447 ev kit schematic
evaluates: max4447/max4448/max4449 max4447 evaluation kit _______________________________________________________________________________________ 3 figure 2. max4447 ev kit component placement guide component side 1.0" figure 3. max4447 ev kit pc board layoutcomponent side figure 4. max4447 ev kit pc board layoutsolder side 1.0" 1.0"
evaluates: max4447/max4448/max4449 max4447 evaluation kit notes 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 ? 1999 maxim integrated products printed usa is a registered trademark of maxim integrated products.
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