v r g nd device description the zref25 uses a bandgap circuit design to achieve a precision micropower voltage reference of 2.5 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 zref25 design provides a stable voltage without an external capacitor and is stable with capacitive loads. the zref25 is recommended for operation between 50 m a and 5ma 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 30ppm/c typical slope resistance 0.4 w 2% and 1% tolerance industrial temperature range (military temperature range available on request) operating current 50 m a to 5ma 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 power supplies. precision 2.5 volt micropower voltage reference issue 2 - february 1998 zref25 schematic diagram 4-271 not recommended for new design please use zxrc250
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 2.475 2.45 2.5 2.5 2.525 2.55 1 2 v i min minimum operating current 25 50 m a i r recommended operating current 0.05 5 ma t c ? average reverse breakdown voltage temp. co. i r(min) to i r(max) 30 90 ppm/c r s slope resistance 0.4 2 w z r reverse dynamic impedance i r = 1ma f = 100hz i ac = 0.1 i r 0.3 0.8 w e n wideband noise voltage i r = 150 m a f = 10hz to 10khz 45 m v(rms) zref25 0 reverse characteristics reverse voltage (v) r evers e c urren t ( m a ) 0.2 0.6 10 20 30 40 50 60 1.0 1.8 2.6 1.4 2.2 t a =25 c t a =85 c t a = -40c ? 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 ) 4-272 not recommended for new design please use zxrc250
zref25 v in - (v) v r - (v) transient response (i r =150 mm a) v i n - (v) v r - (v) 2.50 2.49 2.48 2.47 2.53 2.52 2.51 typical characteristics f orw a r d v ol ta g e (v) temperature (c) reference current (ma) frequency (khz) temperature drift slope resistance v current r ef erenc e v o l t a ge (v) s l ope res i stan ce ( w ) time ( m s) 01 2 -40 11 0 0.1 slope resistance v frequency -20 0 20 40 60 80 forward characteristics forward current (ma) 0.1 1 0.2 0.4 0.6 0.8 1.0 1.2 1.4 10 100 1000 i r =150 m a to 5ma 0 0.5 1.0 1 0.1 10 100 1000 10 100 1 0.1 0.01 34 0 10 0 1.0 2.0 3.0 0 10 0 1.0 2.0 3.0 0 0.1 0.2 0.3 0.4 time ( m s) input input s l ope re si s t an ce ( w ) i r =150 m a i r =1ma i r =5ma t a =25c t a =-40c t a =85c 50k output output 1k5 transient response (i r =5ma) 4-273 not recommended for new design please use zxrc250
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 zref25d02 2 so8 zref2502 zref25d 1 so8 zref25 ZREF25Z02 2 e-line * zref2502 zref25z 1 e-line * zref25 zref2502 2 e-line ? zref2502 zref25 1 e-line ? zref25 * e-line 3 pin reversed ? e-line 2 pin ordering information zref25 4-274 not recommended for new design please use zxrc250
|
