general description the max9092 evaluation kit (ev kit) provides a proven design to evaluate the max9092 dual comparator. the ev kit circuit can be easily configured by installing shunts and changing a few components to support multiple com - parator applications such as window detector and pulse- width modulation (pwm) generator. the ev kit provides 0603 component pcb pads for ease of evaluation. the ev kit operates from a +1.8v to +5.5v vdd supply. the ev kit comes with a max9092aka+ installed. contact the factory for the pin-compatible max9093aka+. features accommodates multiple comparator configurations accommodates easy-to-use components proven pcb layout fully assembled and tested 19-6692; rev 0; 5/13 ordering information appears at end of data sheet. note: indicate that you are using the max9092 when contacting this component supplier. designation qty description c1 1 0.1f 10%, 16v x7r ceramic capacitor (0603) murata gcm188r71c104k c2 1 4.7f 10%, 16v x7r ceramic capacitor (0805) murata grm21br71c475k ju1Cju5 5 2-pin headers ina-, ina+, inam, inap, inb-, inb+, inbm, inbp, outa, outb, vdd, vpulla, vpullb 13 red multipurpose test points designation qty description vss 4 black multipurpose test points r1Cr4 4 0? 5% resistors (0603) r5, r6, r9Cr11 0 not installed, resistors (0603) r7, r8 2 100k? 5% resistors (0603) u1 1 dual comparator (8 sot23) maxim max9092aka+ 5 shunts 1 pcb: max9092 evkit supplier phone website murata americas 800-241-6574 www.murataamericas.com component list component supplier max9092 evaluation kit evaluates: max9092/max9093
maxim integrated 2 quick start required equipment max9092 ev kit three adjustable 0 to +5v dc power supplies oscilloscope procedure the ev kit is fully assembled and tested. follow the steps below to verify board operation. caution: do not turn on the power supplies until all connections are completed. 1) verify that jumpers ju1-ju5 are in their default position, as shown in table 1. 2) set the first dc power supply to +3.3v and connect the positive terminal to vdd and the negative terminal to the gnd pcb pads. 3) set the second dc power supply to +2.5v and connect the positive terminal to vdd and the negative terminal to the gnd pcb pads. 4) set the third dc power supply to +2v and connect the positive terminal to vdd and the negative terminal to the gnd pcb pads. 5) connect an oscilloscopes channel to the outa test point on the ev kit. 6) enable all three power supplies. 7) verify that the outa signal is logic-high (+3.3v). 8) increase the third dc power supply to +3v . 9) verify that the outa signal is logic-low (0v). detailed description of hardware the max9092 ev kit is a fully assembled and tested pcb that evaluates the max9092 dual comparator. the ev kit requires a +1.8v to +5.5v input supply voltage at vdd for normal operation. the ev kit is configurable for different applications, such as logic-level translation, window detector, and pwm generator by adjusting the jumper settings and installing appropriate resistors on the pcb. comparator application circuits logic-level translation jumpers ju2 and ju3 are available to change the logic level of the comparators output. install a shunt on the jumpers to set vdd as the comparator output logic level. remove the shunt from the jumper and apply the desired voltage at the vpulla and/or vpullb test points to set the comparator output logic level independent of the sup - ply voltage. note that the out_ pins on the comparator have an absolute maximum of (vss - 0.3v) to 6v. see table 1 for proper jumper configurations. figure 1. logic-level translator circuit *default position. table 1. ev kit jumper settings (ju1Cju5) vdd v pull v in v ref gnd out_ r7/r8 max9092 jumper shunt position description ju1 installed window detection confguration. connects the outa to outb pin of the device. not installed* disconnects the outa from outb pin of the device. ju2 installed* pulls up to vdd through resistor r7. not installed pulls up to vpulla through resistor r7. external voltage must be applied at the vpulla test point. ju3 installed* pulls up to vdd through resistor r8. not installed pulls up to vpullb through resistor r8. external voltage must be applied at the vpullb test point. ju4 installed window detection confguration. connects the ina- to inb+ pin of the device. not installed* disconnects the ina- from inb+ pin of the device. ju5 installed pwm generator confguration. connects the ina- to inb- pin of the device. not installed* disconnects the ina- from inb- pin of the device. max9092 evaluation kit evaluates: max9092/max9093 www.maximintegrated.com
maxim integrated 3 window detector table 2 depicts the proper jumper configuration for evalu - ating the ev kit window detector application circuit using comparators a and b. resistor r1, r5, and r6 pads are available for setting the overvoltage and undervoltage-threshold levels. outa provides an active-low undervoltage indication and outb provides an active-low overvoltage indication. the open- drain outputs of both comparators are wired in an or configuration using jumper ju1 to give an active-high power-good signal on either outa or outb. for accurate thr eshold set tings, use the following equations in this section. the input bias current into inb- is worst-case 400na over temperature (t a = -40c to +125c) and approximately 250na (max) at room temperature (t a = +25c), so the current through r1 should exceed 40a for the threshold to be accurate over temperature. calculate r5 using equation 1: ( ) ref v 5 (txdw = where v inap is the reference voltage applied at the in- and r5 is in the order of k. choose the desired overvoltage threshold and calculate resistance r t using equation 2 for resistor r5 value: ( ) oth t ref r r5 1 equation 2 v ?? = ? ?? ?? where r t = r6 + r1 in k and v oth is the desired over- voltage threshold in volts. calculate r6 using the equation 3: ( ) t ref uth (r r5)( v ) r6 (r5) equation 3 v + = ? where v uth is the desired undervoltage threshold. obtain the r1 resistor value using equation 4: ( ) t r1 r r5 r6 equation 4 = ?? figure 2. window detector circuit table 2. window detection circuit jumper configuration vdd vdd v inap inb+ ina+ r7 ina- inb- gnd r5 r6 r1 gnd outb outa power good max9092 ref jumper shunt position ju1, ju2, ju4 installed ju3, ju5 not installed max9092 evaluation kit evaluates: max9092/max9093 www.maximintegrated.com
maxim integrated 4 pwm generator the ev kit can be configured to generate a simple pwm signal using comparators a and b. see table 3 for proper jumper configurations on the ev kit for a simple pwm generation circuit. configure comparator a as a relaxation oscillator as follows: 1) add a suitable resistor and capacitor at the r11 and r5 pcb pads, respectively. 2) connect the inap test point to the vdd test point. 3) the trip thresholds are set by applying suitable exter - nal hysteresis using resistors r1, r9, and r10. jumper ju5 connects the sawtooth waveform gener - ated on comparator as inverting input to comparator bs inverting input. the analog control voltage, applied on the noninverting input of comparator b (inb+), determines the pulse width. note: since the relaxation oscillator gener- ates a sawtooth waveform, the duty cycle is not a linear function of the applied analog control voltage. table 3. pwm generation circuit jumper configuration figure 3. pwm generator circuit jumper shunt position ju1, ju4 no installed ju2, ju3, ju5 installed vdd vdd vdd ina- ina+ inb+ inb- gnd r1 outb outa max9092 r10 analog control voltage r8 r7 r11 r9 r5 max9092 evaluation kit evaluates: max9092/max9093 www.maximintegrated.com
maxim integrated 5 figure 4. max9092 ev kit schematic max9092 evaluation kit evaluates: max9092/max9093 www.maximintegrated.com
maxim integrated 6 figure 7. max9092 ev kit pcb layoutsolder side figure 5. max9092 ev kit component placement guide component side figure 6. max9092 ev kit pcb layoutcomponent side 1.0? 1.0? 1.0? max9092 evaluation kit evaluates: max9092/max9093 www.maximintegrated.com
maxim integrated 7 #denotes rohs compliant. part type MAX9092EVKIT# ev kit ordering information max9092 evaluation kit evaluates: max9092/max9093 www.maximintegrated.com
? 2013 maxim integrated products, inc. 8 revision number revision date description pages changed 0 5/13 initial release revision history maxim integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim integrated product. no circuit patent licenses are implied. maxim integrated reserves the right to change the circuitry and specifcations without notice at any time. max9092 evaluation kit evaluates: max9092/max9093 maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrateds website at www.maximintegrated.com.
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