general description maxim? mx584 is a temperature-compensated, bandgap voltage reference which provides pin-program- mable output voltages of +10.00v, +7.50v, +5.00v, and +2.50v. external components are not required for these outputs, but if other voltages are desired, they can be programmed with external resistors. laser trimming minimizes output error as well as tem- perature drift, to as low as 10mv and 15ppm/? with the mx584k. the input voltage range of the max584 is 4.5v to 30v. the reference also includes a strobe input which shuts down the reference output. typical current drain when on is 750?. this drops to about 100? when the reference is strobed off. the mx584 is designed for use with 8- to 14-bit a/d and d/a converters as well as data acquisition systems. it is available in 8-lead to-99 metal cans, plastic dips, cerdips, and so packages. applications cmos dac reference a/d converter reference measurement instrumentation data loggers precision analog systems programmable offset for pgas features ? +10.0v, +7.5v, +5.0v, +2.5v programmable outputs ? 10mv tolerance at +10v (mx584k) ? low tempco: 15ppm/c, max (max584k) ? no external components or trims ? short-circuit proof ? output sources and sinks current ? 10ma output current mx584 pin-programmable, precision voltage reference ________________________________________________________________ maxim integrated products 1 v bg v bg strobe strobe common common 1 2 8 7 +v s cap cap tab 5.0v 5.0v 2.5v 2.5v 10.0v 10.0v 8-lead dip top view to-39 3 4 6 5 mx584 mx584 8 7 6 5 4 3 2 1 pin configuration ordering information r fb v ref 2.4k ? gnd common -15v -5v reference for cmos dac 0 to 5v out2 0.01 f out1 10v 5v v out +v s 1 2 -5v 4 8 mx7533 mx584 max400 t ypical operating circuit 19-1115; rev 2; 11/04 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. part temp range pin-package error mx584jh 0? to +70? 8 to-99 can ?0mv mx584kh 0? to +70? 8 to-99 can ?0mv mx584jn 0? to +70? 8 pdip ?0mv mx584kn 0? to +70? 8 pdip ?0mv mx584jcsa 0? to +70? 8 so ?0mv mx584kcsa 0? to +70? 8 so ?0mv mx584jesa -40? to +85? 8 so ?0mv mx584kesa -40? to +85? 8 so ?0mv mx584jc/d 0? to +70? 8 dice ?0mv mx584sh -55? to +125? 8 to-99 can ?0mv mx584th -55? to +125? 8 to-99 can ?0mv mx584sq -55? to +125? 8 cerdip ?0mv mx584tq -55? to +125? 8 cerdip ?0mv
mx584 pin-programmable, precision voltage reference 2 _______________________________________________________________________________________ absolute maximum ratings stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. input voltage (v in to common)...............................-0.3v, +40v continuous power dissipation metal can (derate 6.7mw/? above +60?) ................600mw cerdip (derate 8mw/? above +75?) .......................600mw plastic dip (derate 6mw/? above +75?) ..................450mw so (derate 5.3mw/? above +75?) ...........................400mw output short-circuit duration (note 1) ..........................indefinite operating temperature range commercial (j, k) ................................................0? to +70? military (s, t) ...................................................-55? to +125? extended (j, k) .................................................-40? to +85? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? die junction temperature (t j ) ..........................-55? to +150? thermal resistance, junction to ambient metal can..................................................................+150?/w cerdip .....................................................................+125?/w plastic dip.................................................................+160?/w so .............................................................................+170?/w electrical characteristics (v in = +15v, t a = +25?, unless otherwise noted.) parameter symbol conditions min typ max units v out = +10v, max584j/s ?0 max584k/t ?0 v out = +7.5v, max584j/s ?2 max584k/t 8 v out = +5.0v, max584j/s ?5 max584k/t 6 v out = +2.5v, max584j/s ?.5 output voltage tolerance i l = 0ma, at pin 1 max584k/t ?.5 mv mx584j/s, all outputs 30 mx584k, all outputs 15 mx584ke, all outputs 20 mx584je, all outputs 30 mx584t, +10v, +7.5v, +5v out 15 output voltage temperature coefficient +2.5v out 20 ppm/? mx584k/t 3 differential tempco between outputs mx584j/s 5 ppm/? quiescent supply current i q i l = 0ma 750 1000 ? quiescent current tempco 1.5 ?/? turn-on settling time t on to ?% 200 ? noise e n(p-p) 0.1hz to 10hz 50 ? p-p long-term stability noncumulative 25 p p m /khr s short-circuit current i sc 30 ma (v out + 2.5v) < v in < +15v 0.005 line regulation no load +15v < v in < +30v 0.002 %/v note 1: absolute maximum power dissipation must not be exceeded.
mx584 pin-programmable, precision voltage reference _______________________________________________________________________________________ 3 electrical characteristics (continued) (v in = +15v, t a = +25?, unless otherwise noted.) parameter symbol conditions min typ max units load regulation i l = 0ma to 5ma 30 ppm/ma t a = +25? 10 source t min to t max 5 mx584j/k 5 t min to t max mx584s/t 0.2 output current sink (note 2) i l v in > v out + 2.5v t a = -55? to +85? mx584s/t 5 ma t ypical operating characteristics (t a = +25?, unless otherwise noted.) 10.005 10.000 9.995 -55 25 070 125 typical temperature characteristics mx584 toc01 temperature ( c) v out (v) spectral noise density and rms noise vs. frequency mx584 toc02 frequency (hz) 100k 10k 1k 100 10 100 1000 1 10 1m no cap noise spectral density (mv/ hz) total noise rms up to specified frequency 100pf 1000pf 0.01 f no cap 0 4 2 6 12 14 10 8 -15 -10 -5 0 -20 5 10 1 520 output voltage vs. sink and source current mx584 toc03 source output voltage (v) +v s = +15v t a = +25 c sink output current (ma) 10 0 20 11 12 10 050 100 150 200 250 power-on settling characteristics mx584 toc04 power-supply input (v) settling time ( s) output (v) 10.030 output (v) 10.020 10.010 10.000 note 2: c load 10nf. see the output current section.
mx584 detailed description as shown in figure 1, most applications of the mx584 require no external components. connections to +v s and common (common is also tied to the case in the to-99 metal package) with all other pins unconnected result in a buffered +10.00v output at pin 1. the other pretrimmed voltages are obtained by strapping pins as shown in table 1. if one or more external buffer ampli- fiers are connected to the programming pins (pins 2, 3), multiple outputs can be obtained from one reference. other output voltages the mx584 can be adjusted to a different output volt- age by adding one or more resistors as in figure 2. as the diagram shows, the reference can be thought of as a 1.215v bandgap followed by a noninverting amplifier. if r1 and r2 are used alone, the adjustment range is widest but the resolution of the trim may be too coarse, even when a multi-turn trip pot is used. when adding external resistors, output voltages well above 10v can be obtained. r2 should therefore be chosen carefully since it sets the maximum output volt- age. r2? resistance should not be so low as to jeopar- dize other circuits if r1 is misadjusted. the fixed output voltages can also be varied by con- necting only one resistor, as in the dashed lines in figure 2. connecting r3 alone raises v out while r4 alone lowers it. these resistors (or potentiometers) must have very low temperature coefficients if accuracy over temperature is to be unaffected by the adjustment. if fine adjustment of the output is all that is required, the circuit of figure 3 is recommended. it provides good stability and resolution for a trim range of ?00mv. if the 2.5v output is adjusted, r2 should be connected to v bg , pin 6, and the trim range should be limited to ?00mv. voltage temperature coefficient the temperature characteristic of the mx584 consis- tently follows an "s-curve" as shown in the typical operating characteristics . a five-point 100% test guar- antees compliance with -55? to +125? specifications and a three-point 100% test guarantees 0? to +70? specifications. the tolerance specifications in the electrical characteristics table state the maximum deviation from the reference? initial value at +25?. by adding the maximum deviation for a given device to its initial toler- ance, the total possible error is determined. pin-programmable, precision voltage reference 4 _______________________________________________________________________________________ output voltage (v) programming (output on pin 1) 10 pins 2 and 3 are unconnected 7.5 connect pins 2 and 3 together 5.0 connect pins 2 and 1 together 2.5 connect pins 3 and 1 together table 1. programming pin connections +(v out + 2.5v) to +30v 10.0v 5.0v 2.5v v out , +2.5v, +5.0v, +7.5v, +10v +v s 1 2 3 4 8 mx584 figure 1. basic connection for positive outputs +2.5v* +1.215v +v s com v bg 2.5v 5v 10v 1 2 8k ? 4k ? r4 r1 r2 r3 4k ? 3 5 4 8 *the 2.5v tap (pin 3) is used internally as a bias point and should not be changed by more than 100mv in any trim configuration. mx584 v supply v out figure 2. variable output options
mx584 pin-programmable, precision voltage reference _______________________________________________________________________________________ 5 10.0v 5.0v 2.5v v bg v out v supply +v s com r2 300k ? r1 10k ? 1 2 3 4 8 mx584 6 figure 3. fine adjustment of output voltage (?00mv) *increases cold start turn-on time. 10.0v 5.0v 0.01 f to 0.1 f 2.5v cap v bg v out +v s com 1 2 3 4 8 mx584 7 6 figure 4. additional noise filtering with an external capacitor 10v 5v com strb 100 ? * 10k ? 20k ? 2.5v 2n2222 *see text. v supply v out +v s 1 2 3 logic input (high = off low = on) 4 5 8 mx584 figure 5. use of strobe terminal com 470 ? 2n6040 c1 0.1 f v out + 10v at 4a v in 15v v out +v s 8 1 4 mx584 figure 6. high-current precision supply com 10v 5v 2.5v 1k ? darlington npn 2n8057 v out = +10v v supply +v s 1 2 3 4 8 mx584 figure 7. npn output current booster 10.0v 2.5v +v s com r 1 3 4 8 mx584 i ? 2.5v + 0.75ma r figure 8. precision current limiter
mx584 output current the mx584 is capable of sinking as well as sourcing current. the circuit is also protected for output shorts to either +vs or ground (common). the output? voltage versus current characteristic is shown in the typical operating characteristics section. for applications that require the mx584 to sink current, maintain a load capacitance of 10nf or greater for proper operation. dynamic performance the turn-on settling performance of the mx584 is shown in the typical operating characteristics . both coarse and fine transient response is shown. the refer- ence typically settles to 1mv (10v output) within 180? after power is applied. noise filtering the bandwidth of the mx584? output amplifier can be limited by connecting a capacitor between the cap and vbg pins (see figure 4). typical values range from 0.01? to 0.1?. the reduction of wideband and feedthrough noise is plotted in a graph in the typical operating characteristics section. strobe input the strobe input, pin 5, zeroes the reference output when it is pulled low. if no current is pulled from strobe, operation is normal. the threshold of the input is 200mv, so an open-drain n-channel fet or open-collector transistor driven from logic is recom- mended (see figure 5). the current-sinking ability should be at least 500? and the leakage current should be 5? or less. while shut down, the mx584 should not be required to source or sink current unless a 0.7v residual output is acceptable. if the reference is required to sink transient current while shut down, the current flowing out of strobe should be limited with 100 ? as shown in the dashed connection in figure 5. applications information precision high-current reference a pnp power transistor, or darlington, is easily connect- ed to the mx584 to greatly increase its output current. the circuit in figure 6 provides a +10v output at up to 4a. if the load has a significant capacitive component, c1 should be added. if the load is purely resistive, high- frequency supply rejection is improved without c1. an npn output transistor or darlington can also be used to boost output current as shown in figure 7. current limiter by adding a single resistor as shown in figure 8, the mx584 is turned into a precision current limiter for pin-programmable, precision voltage reference 6 _______________________________________________________________________________________ 10v com -15v rs 2.4k ? 5% 5v 5v 0.01 f v ref = -5v +v s 1 2 analog ground 4 8 mx584 figure 9. two-terminal -5v reference r fb v ref gnd digital input 4-13 com 7.5v to 15v 0 to -5v -7.5v to -15v out2 out1 10v 5v 5v v out +v s 1 2 1 2 3 16 14 15 4 8 mx7533 mx584 max400 figure 10. low-power, 10-bit cmos dac connection dgnd agnd digital outputs com input 0 to +2.5v 0.01 f 1k ? 5% -5v +5v 2.5v -2.5v ref 10v +v s 1 3 18 42 5 1 8 mx584 db0 db7 13-6 v ref b ofs a in v dd mx7574 figure 11. mx584 as negative 2.5v reference for a cmos adc
applications where the driving voltage is 5v to 40v. the programmed current ranges from 0.75ma to 5ma. negative 10v reference in applications which require a -10v, -7.5v, -5.0v, or -2.5v reference, the mx584 can be connected as a two-terminal device and biased like a zener diode. the circuit is shown in figure 9. +v s and v out are connect- ed to the analog ground bus, and the mx584? com- mon pin is connected, through a resistor, to the negative supply. with 1ma flowing in the reference, the output voltage is typically 2mv greater than what is obtained with the conventional, positive hook-up. when using the 2-terminal connection, the load and the bias resistor must be selected so that the current flow- ing in the reference is maintained between 1ma and 5ma. the operating temperature range for this connec- tion is limited to -55? to +85?. reference for dacs and adcs the mx584 is well suited for use with a wide variety of dacs, especially cmos dacs. figure 10 shows a cir- cuit in which an mx7533 10-bit dac outputs 0 to -5v when using a +5v reference. for a positive dac out- put, the mx584 can be configured as a two-terminal negative reference as well by using the connection of figure 9. in figure 11, an mx7574 cmos adc uses an mx584, connected for -2.5v, as its reference input so that the system can operate from ?v power. the analog input range for the circuit is 0v to +2.5v. mx584 pin-programmable, precision voltage reference _______________________________________________________________________________________ 7 0.071" (1.803mm) strobe common common 2.5v 5.0v 10.0v +v s v bg cap 0.087" (2.209mm) chip topography chip information transistor count: 72 substrate connected to gnd
mx584 pin-programmable, precision voltage reference 8 _______________________________________________________________________________________ package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation, go to www.maxim-ic.com/packages .) to-99, 8ld .eps
mx584 pin-programmable, precision voltage reference _______________________________________________________________________________________ 9 package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation, go to www.maxim-ic.com/packages .) pdipn.eps
mx584 pin-programmable, precision voltage reference 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. 10 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2004 maxim integrated products printed usa is a registered trademark of maxim integrated products. soicn .eps package outline, .150" soic 1 1 21-0041 b rev. document control no. approval proprietary information title: top view front view max 0.010 0.069 0.019 0.157 0.010 inches 0.150 0.007 e c dim 0.014 0.004 b a1 min 0.053 a 0.19 3.80 4.00 0.25 millimeters 0.10 0.35 1.35 min 0.49 0.25 max 1.75 0.050 0.016 l 0.40 1.27 0.394 0.386 d d min dim d inches max 9.80 10.00 millimeters min max 16 ac 0.337 0.344 ab 8.75 8.55 14 0.189 0.197 aa 5.00 4.80 8 n ms012 n side view h 0.244 0.228 5.80 6.20 e 0.050 bsc 1.27 bsc c h e e b a1 a d 0 -8 l 1 variations: package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation, go to www.maxim-ic.com/packages .)
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