device description the zref50 uses a bandgap circuit design to achieve a precision micropower voltage reference of 5.0 volts. the device is available in a small outline surface mount package, ideal for applications where space saving is important, as well as packages for through hole requirements. the zref50 design provides a stable voltage without an external capacitor and is stable with capacitive loads. the zref50 is recommended for operation between 50 m a and 15ma and so is ideally suited to low power and battery powered applications. excellent performance is maintained to an absolute maximum of 25ma, however the rugged design and 20 volt processing allows the reference to withstand transient effects and currents up to 200ma. superior switching capability allows the device to reach stable operating conditions in only a few microseconds. features small outline so8 and to92 style packages no stabilising capacitor required typical t c 15ppm/c typical slope resistance 0.33 w 1% tolerance industrial temperature range (military temperature range available on request) operating current 50 m a to 15ma transient response, stable in less than 10 m s alternative package options and tolerances are available applications battery powered and portable equipment. metering and measurement systems. instrumentation. test equipment. data acquisition systems. precision 5.0 volt micropower voltage reference issue 2 - february 1998 zref50 v r g nd schematic diagram 4-275 not recommended for new design please use zrb500
absolute maximum rating reverse current 25ma forward current 25ma operating temperature -40 to 85c storage temperature -55 to 125c power dissipation (t amb =25c) e-line, 3 pin (to92) 500mw e-line, 2 pin (to92) 500mw so8 625mw electrical characteristics test conditions (unless otherwise stated) t amb =25c symbol parameter conditions limits tol. % units min typ max v r reverse breakdown voltage i r =150 m a 4.95 5.0 5.05 1 v i min minimum operating current 30 50 m a i r recommended operating current 0.05 15 ma t c ? average reverse breakdown voltage temp. co. i r(min) to i r(max) 15 50 ppm/c r s slope resistance 0.33 1.5 w z r reverse dynamic impedance i r =1ma f = 100hz i ac = 0.1 i r 0.4 1 w e n wideband noise voltage i r =150 m a f = 10hz to 10khz 105 m v(rms) zref50 reverse characteristics reverse voltage (v) r everse cur rent ( m a ) 0 60 6.0 2.0 4.0 0 10 20 30 40 50 t a =-40c t a =85c ? t c = ( v r ( max ) - v r ( min ) ) x 1000000 v r x ( t ( max ) - t ( min ) ) note: v r(max) - v r(min) is the maximum deviation in reference voltage measured over the full operating temperature range. r s = v r change ( i r ( min ) to i r ( max ) ) i r ( max ) - i r ( min ) 4-276 not recommended for new design please use zrb500
zref50 typical characteristics forw ard v ol tage (v) temperature (c) reference current (ma) frequency (khz) temperature drift slope resistance v current r e f erenc e v o l t age (v) sl op e res i stanc e ( w ) time ( m s) 0 500 -40 100 0.1 slope resistance v frequency -20 0 20 40 60 80 forward characteristics forward current (ma) 0.1 1 10 100 1000 i r =150 m a to 15ma 1 0.1 10 100 1000 10 100 1 0.1 0.01 1000 0 1 2 3 4 time ( m s) sl op e r e si stan ce ( w ) i r =150 m a i r =5ma 0.4 0.6 0.8 1.0 1.2 1.4 1.6 t a =25c t a =-40c t a =85c 0 10 0 4.0 6.0 4.96 5.02 5.00 4.98 0 2.0 3.0 1.0 11 0 2.0 0 10 0 4.0 6.0 2.0 transient response (single pulse) transient response (repetitive pulse) v in v r 33k 150 m a 5 ma 150 m a 1k 5ma 33k 150 m a 1k 5ma v in - (v) v r - (v) v in - (v) v r - (v) v in v r 4-277 not recommended for new design please use zrb500
so8 package suffix C n8 top view e-line, 3 pin,rev package suffix C r bottom view C pin 3 floating or connected to pin 1 e-line, 2 pin package suffix C y bottom view connection diagrams part no tol% package partmark zref50d 1 so8 zref50 ZREF50Z 1 e-line * zref50 zref50 1 e-line ? zref50 * e-line 3 pin reversed ? e-line 2 pin ordering information zref50 4-278 not recommended for new design please use zrb500
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