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micropower, high accuracy voltage references data sheet adr3525/ adr3530 / adr3533 / adr3540 / adr3550 rev. 0 information furnished by analog devices is believed to be accurate and reliable. however, no responsibility is assumed by analog devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. specifications subject to change without notice. no license is granted by implication or otherwise under any patent or patent rights of analog devices. trademarks and registered trademarks are the property of their respective owners. one technology way, p.o. box 9106, norwood, ma 02062-9106, u.s.a. tel: 781.329.4700 www.analog.com fax: 781.461.3113 ?2011 analog devices, inc. all rights reserved. features maximum temperature coefficient: 5 ppm/c (b grade) low long-term drift (ltd): 30 ppm (initial 1 khr typical) initial output voltage error: 0.1% (maximum) operating temperature range: ?40c to +125c output current: +10 ma source/?3 ma sink low quiescent current: 100 a (maximum) low dropout voltage: 250 mv at 2 ma output voltage noise (0.1 hz to 10 hz): 29 v p-p at 4.096 v (typical) qualified for automotive applications applications automotive battery monitors portable instrumentation process transmitters remote sensors medical instrumentation pin configuration 09594-001 enable 1 gnd sense 2 gnd force 3 nc 4 v in 8 v out sense 7 v out force 6 nc 5 notes 1. nc = no connect. do not connect to this pin. adr35xx top view (not to scale) figure 1. 8-lead msop (rm-8 suffix) general description the adr3525w , adr3530w , adr3533w , adr3540w , and adr3550w are low cost, low power, high precision cmos voltage references, featuring a maximum temperature coeffi- cient (tc) of 5 ppm/c (b grade), 8 ppm/c (a grade), low operating current, and low output noise in an 8-lead msop package. for high accuracy, the output voltage and temperature coefficient are trimmed digitally during final assembly using the analog devices, inc., patented digitrim? technology. the low output voltage hysteresis and low long-term output voltage drift improve lifetime system accuracy. these cmos references are available in five output voltages, all of which are specified over the automotive temperature range of ?40c to +125c. table 1. selection guide model output voltage (v) input voltage range (v) adr3525w 2.500 2.7 to 5.5 adr3530w 3.000 3.2 to 5.5 adr3533w 3.300 3.5 to 5.5 adr3540w 4.096 4.3 to 5.5 adr3550w 5.000 5.2 to 5.5
adr3525/adr3530/adr3533/adr3540/adr3550 data sheet rev. 0 | page 2 of 20 table of contents features .............................................................................................. 1 ? applications ....................................................................................... 1 ? pin configuration ............................................................................. 1 ? general description ......................................................................... 1 ? revision history ............................................................................... 2 ? specifications ..................................................................................... 3 ? adr3525 electrical characteristics .......................................... 3 ? adr3530 electrical characteristics .......................................... 4 ? adr3533 electrical characteristics .......................................... 5 ? adr3540 electrical characteristics .......................................... 6 ? adr3550 electrical characteristics .......................................... 7 ? absolute maximum ratings ............................................................ 8 ? thermal resistance ...................................................................... 8 ? esd caution .................................................................................. 8 ? pin configuration and function descriptions ............................. 9 ? typical performance characteristics ........................................... 10 ? terminology .................................................................................... 16 ? theory of operation ...................................................................... 17 ? long-term output voltage drift ............................................. 17 ? power dissipation....................................................................... 17 ? applications information .............................................................. 18 ? basic voltage reference connection ....................................... 18 ? input and output capacitors .................................................... 18 ? 4-wire kelvin connections ...................................................... 18 ? v in slew rate considerations ................................................... 18 ? shutdown/enable feature ......................................................... 18 ? sample applications ................................................................... 19 ? outline dimensions ....................................................................... 20 ? ordering guide .......................................................................... 20 ? automotive products ................................................................. 20 ? revision history 9/11revision 0: initial version
data sheet adr3525/adr3530/adr3533/adr3540/adr3550 rev. 0 | page 3 of 20 specification s adr3525 electrical characteristics v in = 2.7 v to 5.5 v, i l = 0 ma, t a = 25c, unless otherwise noted. table 2. parameter symbol conditions min typ max unit output voltage v out 2.4975 2.500 2.5025 v initial output voltage error v oerr 0.1 % 2.5 mv temperature coefficient tcv out ?40c t a +125c a grade 2.5 8 ppm/c b grade 2.5 5 ppm/c line regulation v out /v in v in = 2.7 v to 5.5 v 5 50 ppm/v v in = 2.7 v to 5.5 v, ?40c t a +125c 120 ppm/v load regulation v out /i l sourcing i l = 0 ma to 10 ma, v in = 3.0 v, ?40c t a +125c 10 30 ppm/ma sinking i l = 0 ma to ?3 ma, v in = 3.0 v, ?40c t a +125c 10 50 ppm/ma output current capacity i l sourcing v in = 3.0 v to 5.5 v 10 ma sinking v in = 3.0 v to 5.5 v ?3 ma quiescent current i q normal operation enable v in 0.85 85 a enable = v in , ?40c t a +125c 100 a shutdown enable 0.7 v 5 a dropout voltage 1 v do i l = 0 ma, t a = ?40c t a +125c 50 200 mv i l = 2 ma, t a = ?40c t a +125c 75 250 mv enable pin shutdown voltage v l 0 0.7 v enable voltage v h v in 0.85 v in v enable pin leakage current i en enable = v in , t a = ?40c t a +125c 1 3 a output voltage noise e n p-p f = 0.1 hz to 10 hz 18 v p-p f = 10 hz to 10 khz 42 v rms output voltage noise density e n f = 1 khz 1 v/hz output voltage hysteresis 2 v out_hys t a = +25c to ?40c to +125c to +25c 70 ppm ripple rejection ratio rrr f in = 60 hz ?60 db long-term output voltage drift v out_ltd 1000 hours at 50c 30 ppm turn-on settling time t r c in = 0.1 f, c l = 0.1 f, r l = 1 k 600 s 1 refers to the minimum difference between v in and v out such that v out maintains a minimum accuracy of 0. 1%. see the termin section. ology terminology 2 see the section. the part is placed through the temperature cycle in the order of temperatures shown.
adr3525/adr3530/adr3533/adr3540/adr3550 data sheet rev. 0 | page 4 of 20 adr3530 electrical characteristics v in = 3.2 v to 5.5 v, i l = 0 ma, t a = 25c, unless otherwise noted. table 3. parameter symbol conditions min typ max unit output voltage v out 2.9970 3.0000 3.0030 v initial output voltage error v oerr 0.1 % 3.0 mv temperature coefficient tcv out ?40c t a +125c a grade 2.5 8 ppm/c b grade 2.5 5 ppm/c line regulation v out /v in v in = 3.2 v to 5.5 v 5 50 ppm/v v in = 3.2 v to 5.5 v, ?40c t a +125c 120 ppm/v load regulation v out /i l sourcing i l = 0 ma to 10 ma, v in = 3.5 v, ?40c t a +125c 9 30 ppm/ma sinking i l = 0 ma to ?3 ma, v in = 3.5 v, ?40c t a +125c 10 50 ppm/ma output current capacity i l sourcing v in = 3.5 v to 5.5 v 10 ma sinking v in = 3.5 v to 5.5 v ?3 ma quiescent current i q normal operation enable v in 0.85 85 a enable = v in , ?40c t a +125c 100 a shutdown enable 0.7 v 5 a dropout voltage 1 v do i l = 0 ma, t a = ?40c t a +125c 50 200 mv i l = 2 ma, t a = ?40c t a +125c 75 250 mv enable pin shutdown voltage v l 0 0.7 v enable voltage v h v in 0.85 v in v enable pin leakage current i en enable = v in , t a = ?40c t a +125c 0.85 3 a output voltage noise e n p-p f = 0.1 hz to 10 hz 22 v p-p f = 10 hz to 10 khz 45 v rms output voltage noise density e n f = 1 khz 1.1 v/hz output voltage hysteresis 2 v out_hys t a = +25c to ?40c to +125c to +25c 70 ppm ripple rejection ratio rrr f in = 60 hz ?60 db long-term output voltage drift v out_ltd 1000 hours at 50c 30 ppm turn-on settling time t r c in = 0.1 f, c l = 0.1 f, r l = 1 k 700 s 1 refers to the minimum difference between v in and v out such that v out maintains a minimum accuracy of 0. 1%. see the termin section. ology terminology 2 see the section. the part is placed through the temperature cycle in the order of temperatures shown.
data sheet adr3525/adr3530/adr3533/adr3540/adr3550 rev. 0 | page 5 of 20 adr3533 electrical characteristics v in = 3.5 v to 5.5 v, i l = 0 ma, t a = 25c, unless otherwise noted. table 4. parameter symbol test conditions/comments min typ max unit output voltage v out 3.2967 3.3000 3.3033 v initial output voltage error v oerr 0.1 % 3.3 mv temperature coefficient tcv out ?40c t a +125c a grade 2.5 8 ppm/c b grade 2.5 5 ppm/c line regulation v out /v in v in = 3.5 v to 5.5 v 5 50 ppm/v v in = 3.5 v to 5.5 v, ?40c t a +125c 120 ppm/v load regulation v out /i l sourcing i l = 0 ma to 10 ma, v in = 3.8 v, ?40c t a +125c 9 30 ppm/ma sinking i l = 0 ma to ?3 ma, v in = 3.8 v, ?40c t a +125c 10 50 ppm/ma output current capacity i l sourcing v in = 3.8 v to 5.5 v 10 ma sinking v in = 3.8 v to 5.5 v ?3 ma quiescent current i q normal operation enable v in 0.85 85 a enable = v in , ?40c t a +125c 100 a shutdown enable 0.7 v 5 a dropout voltage 1 v do i l = 0 ma, t a = ?40c t a +125c 50 200 mv i l = 2 ma, t a = ?40c t a +125c 75 250 mv enable pin shutdown voltage v l 0 0.7 v enable voltage v h v in 0.85 v in v enable pin leakage current i en enable = v in , t a = ?40c t a +125c 0.85 3 a output voltage noise e n p-p f = 0.1 hz to 10 hz 25 v p-p f = 10 hz to 10 khz 46 v rms output voltage noise density e n f = 1 khz 1.2 v/hz output voltage hysteresis 2 v out_hys t a = +25c to ?40c to +125c to +25c 70 ppm ripple rejection ratio rrr f in = 60 hz ?60 db long-term output voltage drift v out_ltd 1000 hours at 50c 30 ppm turn-on settling time t r c in = 0.1 f, c l = 0.1 f, r l = 1 k 750 s 1 refers to the minimum difference between v in and v out such that v out maintains a minimum accuracy of 0. 1%. see the termin section. ology terminology 2 see the section. the part is placed through the temperature cycle in the order of temperatures shown.
adr3525/adr3530/adr3533/adr3540/adr3550 data sheet rev. 0 | page 6 of 20 adr3540 electrical characteristics v in = 4.3 v to 5.5 v, i l = 0 ma, t a = 25c, unless otherwise noted. table 5. parameter symbol test conditions/comments min typ max unit output voltage v out 4.0919 4.0960 4.1000 v initial output voltage error v oerr 0.1 % 4.096 mv temperature coefficient tcv out ?40c t a +125c a grade 2.5 8 ppm/c b grade 2.5 5 ppm/c line regulation v out /v in v in = 4.3 v to 5.5 v 3 50 ppm/v v in = 4.3 v to 5.5 v, ?40c t a +125c 120 ppm/v load regulation v out /i l sourcing i l = 0 ma to 10 ma, v in = 4.6 v, ?40c t a +125c 6 30 ppm/ma sinking i l = 0 ma to ?3 ma, v in = 4.6 v, ?40c t a +125c 15 50 ppm/ma output current capacity i l sourcing v in = 4.6 v to 5.5 v 10 ma sinking v in = 4.6 v to 5.5 v ?3 ma quiescent current i q normal operation enable v in 0.85 85 a enable = v in , ?40c t a +125c 100 a shutdown enable 0.7 v 5 a dropout voltage 1 v do i l = 0 ma, t a = ?40c t a +125c 50 200 mv i l = 2 ma, t a = ?40c t a +125c 75 250 mv enable pin shutdown voltage v l 0 0.7 v enable voltage v h v in 0.85 v in v enable pin leakage current i en enable = v in , t a = ?40c t a +125c 0.85 3 a output voltage noise e n p-p f = 0.1 hz to 10 hz 29 v p-p f = 10 hz to 10 khz 53 v rms output voltage noise density e n f = 1 khz 1.4 v/hz output voltage hysteresis 2 v out_hys t a = +25c to ?40c to +125c to +25c 70 ppm ripple rejection ratio rrr f in = 60 hz ?60 db long-term output voltage drift v out_ltd 1000 hours at 50c 30 ppm turn-on settling time t r c in = 0.1 f, c l = 0.1 f, r l = 1 k 800 s 1 refers to the minimum difference between v in and v out such that v out maintains a minimum accuracy of 0. 1%. see the termin section. ology terminology 2 see the section. the part is placed through the temperature cycle in the order of temperatures shown.
data sheet adr3525/adr3530/adr3533/adr3540/adr3550 rev. 0 | page 7 of 20 adr3550 electrical characteristics v in = 5.2 v to 5.5 v, t a = 25c, i load = 0 ma, unless otherwise noted. table 6. parameter symbol test conditions/comments min typ max unit output voltage v out 4.995 5.000 5.005 v initial output voltage error v oerr 0.1 % 5.0 mv temperature coefficient tcv out ?40c t a +125c a grade 2.5 8 ppm/c b grade 2.5 5 ppm/c line regulation v out /v in v in = 5.2 v to 5.5 v 3 50 ppm/v v in = 5.2 v to 5.5 v, ?40c t a +125c 120 ppm/v load regulation v out /i l sourcing i l = 0 ma to 10 ma, v in = 5.5 v, ?40c t a +125c 3 30 ppm/ma sinking i l = 0 ma to ?3 ma, v in = 5.5 v, ?40c t a +125c 19 50 ppm/ma output current capacity i l sourcing v in = 5.5 v 10 ma sinking v in = 5.5 v ?3 ma quiescent current i q normal operation enable > v in 0.85 85 a enable = v in , ?40c t a +125c 100 a shutdown enable < 0.7 v 5 a dropout voltage 1 v do i l = 0 ma, ?40c t a +125c 50 200 mv i l = 2 ma, ?40c t a +125c 75 250 mv enable pin shutdown voltage v l 0 0.7 v enable voltage v h v in 0.85 v in v enable pin leakage current i en enable = v in , ?40c t a +125c 0.85 3 a output voltage noise e n p-p f = 0.1 hz to 10 hz 35 v p-p f = 10 hz to 10 khz 60 v rms output voltage noise density e n f = 1 khz 1.5 v/hz output voltage hysteresis 2 v out_hys t a = +25c to ?40c to +125c to +25c 70 ppm ripple rejection ratio rrr f in = 60 hz ?58 db long-term output voltage drift v out_ltd 1000 hours at 50c 30 ppm turn-on settling time t r c in = 0.1 f, c l = 0.1 f, r l = 1 k 900 s 1 refers to the minimum difference between v in and v out such that v out maintains a minimum accuracy of 0. 1%. see the termin section. ology terminology 2 see the section. the part is placed through the temperature cycle in the order of temperatures shown.
adr3525/adr3530/adr3533/adr3540/adr3550 data sheet rev. 0 | page 8 of 20 absolute maximum ratings t a = 25c, unless otherwise noted. table 7. parameter rating supply voltage 6 v enable to gnd sense voltage v in operating temperature range ?40c to +125c storage temperature range ?65c to +150c junction temperature range ?65c to +150c stresses above those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. thermal resistance ja is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. table 8. thermal resistance package type ja jc unit 8-lead msop (rm-8 suffix) 132.5 43.9 c/w esd caution
data sheet adr3525/adr3530/adr3533/adr3540/adr3550 rev. 0 | page 9 of 20 pin configuration and fu nction descriptions 09594-002 enable 1 gnd sense 2 gnd force 3 nc 4 v in 8 v out sense 7 v out force 6 nc 5 notes 1. nc = no connect. do not connect to this pin. adr35xx top view (not to scale) figure 2. pin configuration table 9. pin function descriptions pin no. mnemonic description 1 enable enable connection. enables or disables the device. 2 gnd sense ground voltage sense connection. connect directly to the point of lowest potential in the application. 3 gnd force ground force connection. 4 nc no connect. do not connect to this pin. 5 nc no connect. do not connect to this pin. 6 v out force reference voltage output. 7 v out sense reference voltage output sensing connection. connect directly to the voltage input of the load devices. 8 v in input voltage connection.
adr3525/adr3530/adr3533/adr3540/adr3550 data sheet rev. 0 | page 10 of 20 typical performance characteristics t a = 25c, unless otherwise noted. 2.4990 2.4992 2.4994 2.4996 2.4998 2.5000 2.5002 2.5004 2.5006 2.5008 2.5010 ?40 ?25 ?10 5 20 35 50 65 80 95 110 125 output voltage (v) temperature (oc) v in = 5.5v 09594-003 figure 3. adr3525 output voltage vs. temperature 0 5 10 15 20 25 30 35 40 01234567891011 number of devices temperature coefficient (ppm/c) 09594-004 figure 4. adr3525 temperature coefficient distribution 0 2 4 6 8 10 12 14 16 18 20 22 24 ?40 ?25 ?10 5 20 35 50 65 80 95 110 125 load regul a tion (ppm/v) temperature (c) i l = 0ma to 10ma sourcing 09594-005 adr3525 adr3530 adr3533 adr3540 adr3550 figure 5. load regulation vs. temperature (sourcing) 4.9975 4.9980 4.9985 4.9990 4.9995 5.0000 5.0005 5.0010 5.0015 5.0020 5.0025 ?40 ?25 ?10 5 20 35 50 65 80 95 110 125 output voltage (v) temperature (oc) 09594-006 v in = 5.5v figure 6. adr3550 output voltage vs. temperature 0 5 10 15 20 25 30 40 35 45 01234567891011 number of devices temperature coefficient (ppm/c) 09594-007 figure 7. adr3550 temperature coefficient distribution ?40 ?25 ?10 5 20 35 50 65 80 95 110 125 load regul a tion (ppm/v) temperature (c) i l = 0ma to ?3ma sinking 09594-008 adr3525 adr3530 adr3533 adr3540 adr3550 5 10 15 20 25 30 35 figure 8. load regulation vs. temperature (sinking)
data sheet adr3525/adr3530/adr3533/adr3540/adr3550 rev. 0 | page 11 of 20 0 50 100 150 200 250 300 350 400 ?3 ?2 ?1 0 1 2 3 4 5 6 7 8 9 10 differenti a l voltage (mv) load current (ma) ?40c +25c +125c 09594-009 figure 9. adr3525 dropout voltage vs. load current 0 50 100 150 200 250 300 350 differenti a l voltage (mv) load current (ma) ?3 ?2 ?1 0 1 2 3 4 5 6 7 8 9 10 09594-010 ?40c +25c +125c figure 10. adr3550 dropout voltage vs. load current 0 20 40 60 80 100 120 140 ?40 ?25 ?10 5 20 35 50 65 80 95 110 125 line regul a tion (ppm/v) temperature (c) adr3525 adr3530 adr3533 adr3540 adr3550 09594-011 figure 11. line regulation vs. temperature 09594-012 ch1 pk-pk = 18v ch1 rms = 3.14v 1 10v/div time = 1s/div figure 12. adr3525 output voltage noise (0.1 hz to 10 hz) 09594-013 ch1 pk-pk = 300v ch1 rms = 42.0v 1 100v/div time = 1s/div figure 13. adr3525 output voltage noise (10 hz to 10 khz) 0 2 4 6 8 10 12 0.1 1 10 100 1k 10k frequency (hz) 09594-014 noise density (v p-p/ hz) figure 14. adr3525 output noise spectral density
adr3525/adr3530/adr3533/adr3540/adr3550 data sheet rev. 0 | page 12 of 20 ?90 ?80 ?70 ?60 ?50 ?40 ?30 ?20 ?10 0 10 100 1k 10k 100k ripple rejection r a tio (db v out /v in ) frequency (hz) c l = 1.1f c in = 0.1f 09594-015 figure 15. adr3525 ripple rejection ratio vs. frequency 0 9594-016 1 2 c in = c l = 0.1f r l = v out = 1v/div v in = 2v/div time = 200s/div figure 16. adr3525 start-up response 0 9594-017 1 2 v enable = 1v/div v in = 3.0v c in = c l = 0.1f r l = v out = 1v/div enable time = 200s/div figure 17. adr3525 restart response from shutdown 09594-018 ch1 pk-pk = 33.4v ch1 rms = 5.68v 1 10v/div figure 18. adr3550 output voltage noise (0.1 hz to 10 hz) 09594-019 ch1 pk-pk = 446v ch1 rms = 60.3v 1 100v/div figure 19. adr3550 output voltage noise (10 hz to 10 khz) 0 2 4 6 8 10 12 0.1 1 10 100 1k 10k frequency (hz) 09594-020 noise density (v p-p/ hz) figure 20. adr3550 output noise spectral density
data sheet adr3525/adr3530/adr3533/adr3540/adr3550 rev. 0 | page 13 of 20 ?90 ?80 ?70 ?60 ?50 ?40 ?30 ?20 ?10 0 10 100 1k 10k 100k ripple rejection r a tio (db v out /v in ) frequency (hz) c l = 1.1f c in = 0.1f 09594-021 figure 21. adr3550 ripple rejection ratio vs. frequency 0 9594-022 1 2 time = 200s/div c in = 0f c l = 0.1f r l = v in 2v/div v out 2v/div figure 22. adr3550 start-up response 0 9594-023 1 2 v enable = 2v/div v in = 5.5v c in = c l = 0.1f r l = v out = 2v/div enable time = 200s/div figure 23. adr3550 restart response from shutdown 0 9594-024 1 2 c in = c l = 0.1f v in = 3v r l = 1k ? v out = 1v/div enable 1v/div time = 200s/div figure 24. adr3525 shutdown response 09594-025 1 2 c in = c l = 0.1f v out = 10mv/div 500mv/div 3.2v 2.7v time = 1ms/div figure 25. adr3525 line transient response 0 9594-026 c in = 0.1f c l = 0.1f r l = 250 ? v out = 20mv/div sinking sinking ?3ma 2.5v +10ma sourcing i l time = 1ms/div figure 26. adr3525 load transient response
adr3525/adr3530/adr3533/adr3540/adr3550 data sheet rev. 0 | page 14 of 20 09594-027 1 2 c in = c l = 0.1f v in = 5v r l = 1k ? v out = 2v/div enable 2v/div time = 200s/div figure 27. adr3550 shutdown response 09594-028 1 2 c in = c l = 0.1f v out = 5mv/div v in = 100mv/div 5.5v 5.2v time = 1ms/div figure 28. adr3550 line transient response 09594-029 c in = 0.1f c l = 0.1f r l = 500 ? v out = 20mv/div sinking sinking ?3ma 5.0v +10ma sourcing i l time = 1ms/div figure 29. adr3550 load transient response 0 10 20 30 40 50 60 70 80 90 100 ?40 ?25 ?10 5 20 35 50 65 80 95 110 125 supply current (a) temperature (c) v in = 5.5 v 09594-030 figure 30. supply current vs. temperature 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0 10 20 30 40 50 60 70 80 90 100 supply current (ma) enable voltage (% of v in ) 09594-031 ?40c +25c +125c figure 31. supply current vs. enable pin voltage 0.01 0.1 1 10 0.01 0.1 1 10 100 1k 10k output impedance ( ? ) frequency (hz) c l = 0.1f c l = 1.1f 09594-032 figure 32. adr3550 output impedance vs. frequency
data sheet adr3525/adr3530/adr3533/adr3540/adr3550 rev. 0 | page 15 of 20 0 1 2 3 4 5 6 7 8 9 ?0.008 ?0.010 ?0.006 ?0.004 ?0.002 0 0.002 0.004 0.006 0.008 0.010 0.012 0.014 0.016 0.018 0.020 number of devices relative shift in v out (%) 09594-033 figure 33. output voltage drift distribution after reflow (shr drift) 0 1 2 3 4 5 6 7 8 ?150 ?140 ?130 ?120 ?110 ?100 ?90 ?80 ?70 ?60 ?50 ?40 ?30 ?20 ?10 0 10 20 30 40 number of devices output voltage hysteresis (ppm) t a = +25c ?40c +125c +25c 09594-034 figure 34. adr3550 thermally induced output voltage hysteresis distribution 80 60 40 20 0 ?20 ?40 ?60 ?80 0 200 400 800 600 1000 09594-035 long-term output voltage drift (ppm) elapsed time (hours) figure 35. adr3550 typical long-term output voltage drift (four devices, 1000 hours)
adr3525/adr3530/adr3533/adr3540/adr3550 data sheet rev. 0 | page 16 of 20 terminology dropout voltage (v do ) dropout voltage, sometimes referred to as supply voltage headroom or supply-output voltage differential, is defined as the minimum voltage differential between the input and output such that the output voltage is maintained to within 0.1% accuracy. v do = (v in ? v out ) min | i l = constant because the dropout voltage depends upon the current passing through the device, it is always specified for a given load current. in series-mode devices, dropout voltage typically increases proportionally to load current (see figure 9 and figure 10 ). temperature coefficient (tcv out ) the temperature coefficient relates the change in output voltage to the change in ambient temperature of the device, as normalized by the output voltage at 25c. this parameter is expressed in ppm/c and can be determined by the following equations: ]/[10 )()( )},(min{)},(max{ 6 cppm tttv ttvttv tcv 122 out 21 out 21 out 1 out ? ? = ]/[10 )()( )},(min{)},(max{ 6 cppm tttv ttvttv tcv 232 out 32 out 32 out 2 out ? ? = }, max{ 2 out out1 out tcv tcv tcv = (1) where: v out (t) is the output voltage at temperature t. t 1 = ?40c. t 2 = +25c. t 3 = +125c. this three-point method ensures that tcv out accurately portrays the maximum difference between any of the three temperatures at which the output voltage of the part is measured. thermally induced output voltage hysteresis (v out_hys ) thermally induced output voltage hysteresis represents the change in output voltage after the device is exposed to a specified temperature cycle. this is expressed as either a shift in voltage or a difference in ppm from the nominal output. tcout out hysout vcv v _ _ )25( ?= [v] 6 _ _ 10 )25( )25( ? = cv vcv v out tcout out hysout [ppm] where: v out (25c) is the output voltage at 25c. v out_tc is the output voltage after temperature cycling. long-term output voltage drift (v out_ltd ) long-term output voltage drift refers to the shift in output voltage after 1000 hours of operation in a constant 50c environment. this is expressed as either a shift in voltage or a difference in ppm from the nominal output. )()( _ 0 out 1 out ltdout tvtv v ?= [v] 6 _ 10 )( )()( ? = 0 out 0 out 1 out ltdout tv tvtv v [ppm] where: v out (t 0 ) is the v out at 50c at time 0. v out (t 1 ) is the v out at 50c after 1000 hours of operation at 50c. line regulation line regulation refers to the change in output voltage in response to a given change in input voltage and is expressed in percent per volt, ppm per volt, or microvolts per volt change in input voltage. this parameter accounts for the effects of self-heating. load regulation load regulation refers to the change in output voltage in response to a given change in load current and is expressed in microvolts per ma, ppm per ma, or ohms of dc output resistance. this parameter accounts for the effects of self- heating. solder heat resistance (shr) drift shr drift refers to the permanent shift in output voltage induced by exposure to reflow soldering, expressed in units of ppm. this is caused by changes in the stress exhibited upon the die by the package materials when exposed to high tempera- tures. this effect is more pronounced in lead-free soldering processes due to higher reflow temperatures.
data sheet adr3525/adr3530/adr3533/adr3540/adr3550 rev. 0 | page 17 of 20 theory of operation band gap voltage reference enable gnd force v out force v out sense r fb2 r fb1 v in v bg gnd sense 09594-036 figure 36. block diagram the adr3525w / adr3530w / adr3533w / adr3540w / adr3550w use a patented voltage reference architecture to achieve high accuracy, low temperature coefficient (tc), and low noise in a cmos process. like all band gap references, the references combine two voltages of opposite tcs to create an output voltage that is nearly independent of ambient tempera- ture. however, unlike traditional band gap voltage references, the temperature-independent voltage of the references is arranged to be the base-emitter voltage, v be , of a bipolar transistor at room temperature rather than the v be extrapolated to 0 k (the v be of bipolar transistor at 0 k is approximately v g0 , the band gap voltage of silicon). a corresponding positive tc voltage is then added to the v be voltage to compensate for its negative tc. the key benefit of this technique is that the trimming of the initial accuracy and tc can be performed without interfering with one another, thereby increasing overall accuracy across temperature. curvature correction techniques further reduce the temperature variation. the band gap voltage (v bg ) is then buffered and amplified to produce stable output voltages of 2.5 v and 5.0 v. the output buffer can source up to 10 ma and sink up to ?3 ma of load current. the adr35xx references leverage analog devices patented digitrim technology to achieve high initial accuracy and low tc, and precision layout techniques lead to very low long-term drift and thermal hysteresis. long-term output voltage drift one of the key parameters of the adr35xx references is long- term output voltage drift. independent of the output voltage model and in a 50c environment, these devices exhibit a typical drift of approximately 30 ppm after 1000 hours of continuous, unloaded operation. it is important to understand that long-term output voltage drift is not tested or guaranteed by design and that the output from the device may shift beyond the typical 30 ppm specification. because most of the drift occurs in the first 200 hours of device operation, burning in the system board with the reference mounted can reduce subsequent output voltage drift over time. see the an-713 application note , the effect of long-term drift on voltage references , at www.analog.com for more information regarding the effects of long-term drift and how it can be minimized. power dissipation the adr35xx voltage references are capable of sourcing up to 10 ma of load current at room temperature across the rated input voltage range. however, when used in applications subject to high ambient temperatures, the input voltage and load cur- rent should be carefully monitored to ensure that the device does not exceed its maximum power dissipation rating. the maximum power dissipation of the device can be calculated via the following equation: ][ w tt p ja a j d ? ? ? where: p d is the device power dissipation. t j is the device junction temperature. t a is the ambient temperature. ja is the package (junction-to-air) thermal resistance. because of this relationship, the acceptable load current in high temperature conditions may be less than the maximum current- sourcing capability of the device. in no case should the part be operated outside of its maximum power rating because doing so can result in premature failure or permanent damage to the device.
adr3525/adr3530/adr3533/adr3540/adr3550 data sheet rev. 0 | page 18 of 20 applications information basic voltage reference connection v in 2.7v to 5.5v v out 2.5v 0.1f 1f 0.1f v in enable v out force v out sense gnd force gnd sense 8 1 6 7 2 3 09594-037 ad3525/adr3530/ ard3533/adr3540/ adr3550 figure 37. basic reference connection the circuit shown in figure 37 illustrates the basic configuration for the adr35xx references. bypass capacitors should be connected according to the following guidelines. input and output capacitors a 1 f to 10 f electrolytic or ceramic capacitor can be connected to the input to improve transient response in applications where the supply voltage may fluctuate. an additional 0.1 f ceramic capacitor should be connected in parallel to reduce high frequency supply noise. a ceramic capacitor of at least a 0.1 f must be connected to the output to improve stability and help filter out high fre- quency noise. an additional 1 f to 10 f electrolytic or ceramic capacitor can be added in parallel to improve transient performance in response to sudden changes in load current; however, the designer should keep in mind that doing so increases the turn-on time of the device. best performance and stability is attained with low esr (for example, less than 1 ), low inductance ceramic chip-type output capacitors (x5r, x7r, or similar). if using an electrolytic capacitor on the output, a 0.1 f ceramic capacitor should be placed in parallel to reduce overall esr on the output. 4-wire kelvin connections current flowing through a pcb trace produces an ir voltage drop, and with longer traces, this drop can reach several millivolts or more, introducing a considerable error into the output voltage of the reference. a 1 inch long, 5 millimeter wide trace of 1 ounce copper has a resistance of approximately 100 m at room temperature; at a load current of 10 ma, this can introduce a full millivolt of error. in an ideal board layout, the reference should be mounted as close to the load as possible to minimize the length of the output traces, and, therefore, the error introduced by voltage drop. however, in applications where this is not possible or convenient, force and sense connections (sometimes referred to as kelvin sensing connections) are provided as a means of minimizing the ir drop and improving accuracy. kelvin connections work by providing a set of high impedance voltage-sensing lines to the output and ground nodes. because very little current flows through these connections, the ir drop across their traces is negligible, and the output and ground voltages can be sensed accurately. these voltages are fed back into the internal amplifier and used to automatically correct for the voltage drop across the current-carrying output and ground lines, resulting in a highly accurate output voltage across the load. to achieve the best performance, the sense connections should be connected directly to the point in the load where the output voltage should be the most accurate. see figure 38 for an example application. load v in 0.1f 0.1f 1f 09594-038 output cap a citor(s) should be mounted as close to v out force pin as possible. sense connections should connect as close to load device as possible. v in enable v out force v out sense gnd force gnd sense 8 1 6 7 2 3 ad3525/adr3530/ ard3533/adr3540/ adr3550 figure 38. application showing kelvin connection it is always advantageous to use kelvin connections whenever possible. however, in applications where the ir drop is negligi- ble or an extra set of traces cannot be routed to the load, the force and sense pins for both v out and gnd can simply be tied together, and the device can be used in the same way as a normal 3-terminal reference (as shown in figure 37 ). v in slew rate considerations in applications with slow rising input voltage signals, the refer- ence exhibits overshoot or other transient anomalies that appear on the output. these phenomena also appear during shutdown as the internal circuitry loses power. to avoid such conditions, ensure that the input voltage wave- form has both a rising and falling slew rate of at least 0.1 v/ms. shutdown/enable feature the adr35xx references can be switched to a low power shut- down mode when a voltage of 0.7 v or lower is input to the enable pin. likewise, the reference becomes operational for enable voltages of 0.85 v in or higher. during shutdown, the supply current drops to less than 5 a, useful in applications that are sensitive to power consumption. if using the shutdown feature, ensure that the enable pin voltage does not fall between 0.7 v and 0.85 v in because this causes a large increase in the supply current of the device and may keep the reference from starting up correctly (see figure 31 ). if not using the shutdown feature, however, the enable pin can simply be tied to the v in pin, and the reference remains operational continuously.
data sheet adr3525/adr3530/adr3533/adr3540/adr3550 rev. 0 | page 19 of 20 sample applications negative reference figure 39 shows how to connect the adr3550 and a standard cmos op amp, such as the ad8663 , to provide a negative reference voltage. this configuration provides two main advantages: first, it requires only two devices and, therefore, does not require excessive board space; second, and more importantly, it does not require any external resistors, meaning that the performance of this circuit does not rely on choosing expensive parts with low temperature coefficients to ensure accuracy. ad8663 0.1f 1f +vdd ?vdd 0.1f 0.1f ?5v 09594-039 adr3550 v in enable v out force v out sense gnd force gnd sense 8 1 6 7 2 3 figure 39. adr3550 negative reference in this configuration, the v out force and v out sense pins of the reference sit at virtual ground, and the negative reference voltage and load current are taken directly from the output of the operational amplifier. note that in applications where the negative supply voltage is close to the reference output voltage, a dual-supply, low offset, rail-to-rail output amplifier must be used to ensure an accurate output voltage. the operational amplifier must also be able to source or sink an appropriate amount of current for the application. bipolar output reference figure 40 shows a bipolar reference configuration. by connecting the output of the adr3550 to the inverting terminal of an operational amplifier, it is possible to obtain both positive and negative reference voltages. r1 and r2 must be matched as closely as possible to ensure minimal difference between the negative and positive outputs. resistors with low temperature coefficients must also be used if the circuit is used in environments with large temperature swings; otherwise, a voltage difference develops between the two outputs as the ambient temperature changes. v in +15v ?15v ?5v +5v ada4000-1 0.1f 1f 0.1f r1 10k ? r2 10k ? r3 5k? 0 9594-040 adr3550 v in enable v out force v out sense gnd force gnd sense 8 1 6 7 2 3 figure 40. adr3550 bipolar output reference boosted output current reference figure 41 shows a configuration for obtaining higher current drive capability from the adr35xx references without sacrificing accuracy. the op amp regulates the current flow through the mosfet until v out equals the output voltage of the reference; current is then drawn directly from v in instead of from the reference itself, allowing increased current drive capability. 0.1f c l 0.1f 09594-041 2n7002 ad8663 v in u6 v out +16v 0.1f 1f r1 100 ? r l 200 ? v in enable v out force v out sense gnd force gnd sense 8 1 6 7 2 3 ad3525/adr3530/ ard3533/adr3540/ adr3550 figure 41. boosted output current reference because the current-sourcing capability of this circuit depends only on the i d rating of the mosfet, the output drive capability can be adjusted to the application simply by choosing an appropriate mosfet. in all cases, the v out sense pin should be tied directly to the load device to maintain maximum output voltage accuracy.
adr3525/adr3530/adr3533/adr3540/adr3550 data sheet rev. 0 | page 20 of 20 outline dimensions compliant to jedec standards mo-187-aa 6 0 0.80 0.55 0.40 4 8 1 5 0.65 bsc 0.40 0.25 1.10 max 3.20 3.00 2.80 coplanarity 0.10 0.23 0.09 3.20 3.00 2.80 5.15 4.90 4.65 pin 1 identifier 15 max 0.95 0.85 0.75 0.15 0.05 10-07-2009-b figure 42. 8-lead mini small outline package [msop] (rm-8) dimensions show in millimeters ordering guide model 1 , 2 output voltage (v) temperature range package description package option ordering quantity branding ADR3525WARMZ-R7 2.500 ?40c to +125c 8-lead msop rm-8 1000 r3c adr3525wbrmz-r7 2.500 ?40c to +125c 8-lead msop rm-8 1000 r2t adr3530warmz-r7 3.000 ?40c to +125c 8-lead msop rm-8 1000 r3d adr3530wbrmz-r7 3.000 ?40c to +125c 8-lead msop rm-8 1000 r37 adr3533warmz-r7 3.300 ?40c to +125c 8-lead msop rm-8 1000 r3e adr3533wbrmz-r7 3.300 ?40c to +125c 8-lead msop rm-8 1000 r38 adr3540warmz-r7 4.096 ?40c to +125c 8-lead msop rm-8 1000 r3f adr3540wbrmz-r7 4.096 ?40c to +125c 8-lead msop rm-8 1000 r39 adr3550warmz-r7 5.000 ?40c to +125c 8-lead msop rm-8 1000 r3g adr3550wbrmz-r7 5.000 ?40c to +125c 8-lead msop rm-8 1000 r3b 1 z = rohs compliant part. 2 w = qualified for auto motive applications. automotive products the adr3525w / adr3530w / adr3533w / adr3540w / adr3550w models are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. note that these automotive models may have specifications that differ from the commercial models; therefore, designers should review th e specifications section of this data sheet carefully. only th e automotive grade products shown are available for use in automotive applications. contact your local analog devices account representative for specific product ordering information and to obtain the specific automotive reliability reports for these mo dels. ?2011 analog devices, inc. all rights reserved. trademarks and registered trademarks are the prop erty of their respective owners. d09594-0-9/11(0)

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