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high speed, rail-to-rail output op amps with ultralow power-down data sheet ada4850-1 / ada4850-2 rev. d document feedback 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 ?2005C2016 analog devices, inc. all rights reserved. technical support www.analog.com features ultralow power-down curren t: 150 na/amplifier maximum low quiescent current: 2.4 ma/amplifier high speed 175 mhz, ?3 db bandwidth 220 v/s slew rate 85 ns settling time to 0.1% excellent video specifications 0.1 db flatness: 14 mhz differential gain: 0.12% differential phase: 0.09 single-supply operation: 2.7 v to 6 v rail-to-rail output output swings to within 80 mv of either rail low voltage offset: 0.6 mv applications portable multimedia players video cameras digital still cameras consumer video clock buffers pin configurations figure 1. 8-lead, 3 mm 3 mm lfcsp figure 2. 16-lead, 3 mm 3 mm lfcsp general description the ada4850-1 / ada4850-2 are low price, high speed, voltage feedbacks rail-to-rail output op amps with ultralow power-down. despite their low price, the ada4850-1 / ada4850-2 provide excellent overall performance and versatility. the 175 mhz, ?3 db bandwidth and 220 v/s slew rate make these amplifiers well-suited for many general-purpose, high speed applications. the ada4850-1 / ada4850-2 are designed to operate at supply voltages as low as 2.7 v and up to 6 v at 2.4 ma of supply current per amplifier. in power-down mode, the supply current is less than 150 na, ideal for battery-powered applications. the ada4850-1 / ada4850-2 family provides users with a true single-supply capability, allowing input signals to extend 200 mv below the negative rail and to within 2.2 v of the positive rail. the output of the amplifier can swing within 80 mv of either supply rail. with its combination of low price, excellent differential gain (0.12%), differential phase (0.09), and 0.1 db flatness out to 14 mhz, these amplifiers are ideal for video applications. the ada4850-1 / ada4850-2 are designed to work in the extended temperature range of ?40c to +125c. figure 3. small signal frequency response power down nic ?in +in output +v s nic ?v s 05320-106 notes 1. exposed pad can be connected to gnd, or left floating. 2. nic = no internal connection. 3 4 1 2 6 5 8 7 ada4850-1 top view 05320-043 notes 1. exposed pad can be connected to gnd, or left floating. 2. nic = no internal connection. 12 11 10 1 3 4 9 2 6 5 7 8 1 6 1 5 1 4 1 3 ada4850-2 top view v out 1 ?in1 +in1 ?v s +v s pd2 pd1 nic nic v out 2 ?in2 +in2 nic nic nic nic closed-loop gain (db) 1 100 10 1000 05320-054 frequency (mhz) ?6 ?4 ?5 ?2 ?3 0 ?1 2 1 g = +1 v s = 5v r l = 1k ? v out = 0.1v p-p
ada4850- 1/ada4850 - 2 data sh eet rev. d | page 2 of 14 table of contents features .............................................................................................. 1 applications ....................................................................................... 1 pin configurations ........................................................................... 1 general description ......................................................................... 1 revision history ............................................................................... 2 specifications ..................................................................................... 3 specifications with +3 v supply ................................................. 3 specifications with +5 v supply ................................................. 4 absolute maximum ratings ............................................................ 5 thermal resistance ...................................................................... 5 esd caution ...................................................................................5 typical performance characteristics ..............................................6 circuit description ......................................................................... 12 headroom and overdrive recovery considerations ............ 12 operating the ada4850 - 1/ada4850 - 2 on bipolar supplies ....................................................................................................... 13 power - down pins ....................................................................... 13 outline dimensions ....................................................................... 14 ordering guide .......................................................................... 14 r evision h istory 5 /1 6 rev. c to rev. d change cp - 8 - 2 to cp - 8 - 13 and cp - 16 - 3 to cp - 16- 21 .. throughout changes to figure 1 and figure 2 ................................................... 1 updated o utline dimensions ....................................................... 14 changes to ordering guide .......................................................... 14 5/12 rev. b to rev. c added exposed pat notation to figure 1 and figure 2 ............... 1 change s to table 4 and figure 4 ..................................................... 5 added exposed pad notation to outline dimensions ............. 14 changes to ordering guide .......................................................... 14 12 /07 rev. a to rev. b changes to applications .................................................................. 1 updated o utline dimensions ....................................................... 14 changes to ordering guide .......................................................... 14 4/05 rev. 0 to rev. a added ada 4850 - 1 ............................................................. universal added 8 - lead lfcs p ......................................................... universal changes to features .......................................................................... 1 changes to general description ..................................................... 1 changes to figure 3 ........................................................................... 1 changes to table 1 ............................................................................. 3 changes to table 2 ............................................................................. 4 changes to power - down pin s section and table 5 ................... 13 updated outline dimensions ....................................................... 14 changes to ordering guide .......................................................... 14 2/05 revision 0: initial version
data sheet ada4850- 1/ada4850 - 2 rev. d | page 3 of 14 specifications specifications with +3 v supply t a = 25c, r f = 0 ? for g = +1, r f = 1 k? for g > +1, r l = 1 k? , unless otherwise no ted. table 1 . parameter test conditions /comments min typ max unit dynamic performance ?3 db bandwidth g = +1, v o = 0.1 v p -p 160 mhz g = +2, v o = 0.5 v p - p, r l = 150 45 mhz bandwidth for 0.1 db flatness g = +2, v o = 0.5 v p - p, r l = 150 14 mhz slew rate g = +2, v o = 1 v st ep 110 v/s settling time to 0.1% g = +2, v o = 1 v s tep, r l = 150 80 ns noise/distortion performance harmonic distortion (dbc) hd2/hd3 f c = 1 mhz, v o = 2 v p - p, g = +3, r l = 150 ?72/?77 dbc input voltage noise f = 100 khz 10 nv/ hz input current noise f = 100 khz 2.5 pa/ hz differential gain g = +3, ntsc, r l = 150 , v o = 2 v p -p 0.2 % differential phase g = +3, ntsc, r l = 150 , v o = 2 v p - p 0.2 degrees dc performance input offset voltage 0.6 4.1 mv input offset voltage drift 4 v/ c input bias current 2.4 4.4 a input bias current drift 4 na/ c input bias offset current 30 na open - loop gain v o = 0.25 v to 0.75 v 78 100 db input characteristics input resistance differential/common - mode 0.5/5.0 m input capacitance 1.2 pf input common - mode voltage range ?0.2 to +0.8 v input overdrive recovery time (rise/fall) v in = +3.5 v to ?0.5 v, g = +1 60/50 ns common - mode rejection ratio v cm = 0.5 v ?76 ?108 db power - down power - down input voltage power - down ada4850 -1 / ada4850 -2 <0.7/<0.6 v enabled ada4850 -1 / ada4850 -2 >0.8/>1.7 v turn - off time 0.7 s turn - on time 60 ns power - down bias current/ power down pin enabled power - down = 3 v 37 55 a power - down power - down = 0 v 0.01 0.2 a output characteristics output overdrive recovery time (rise/fall) v in = +0.7 v to ?0.1 v, g = +5 70/100 ns output voltage swing 0.06 to 2.83 0.03 to 2.92 v short - circuit current sinking/sourcing 105/74 ma power supply operating range 1 2.7 6 v quiescent current/amplifier 2.4 2.8 ma quiescent current (power - down)/amplifier 15 150 na positive power supply rejection +v s = +3 v to +4 v, ?v s = 0 v ?83 ?100 db negative power supply rejection +v s = +3 v, ?v s = 0 v to C 1 v ?83 ?102 db 1 for operation on bipolar supplies, see the operating the ada4850 - 1 / ada4850 - 2 on bipolar supplies section.
ada4850- 1/ada4850 - 2 data sh eet rev. d | page 4 of 14 s pecifications with +5 v supply t a = 25c, r f = 0 ? for g = +1, r f = 1 k? for g > +1, r l = 1 k?, unless otherwise no ted. table 2 . parameter test conditions /comments min typ max unit dynamic performance ?3 db bandwidth g = +1, v o = 0.1 v p -p 175 mhz g = +1, v o = 0.5 v p -p 110 mhz bandwidth for 0.1 db flatness g = +2, v o = 1.4 v p - p, r l = 150 9 mhz slew rate g = +2, v o = 4 v s tep 220 v/s g = +2, v o = 2 v s tep 160 v/s settling time to 0.1% g = +2, v o = 1 v s tep, r l = 150 85 ns noise/distortion performance harmonic distortion (dbc) hd2/hd3 f c = 1 mhz, v o = 2 v p - p, g = +2, r l = 150 ?81/?86 dbc input voltage noise f = 100 khz 10 nv/ hz input current noise f = 100 khz 2.5 pa/ hz differential gain g = +3, ntsc, r l = 150 0.12 % differential phase g = +3, ntsc, r l = 150 0.09 degrees crosstalk (rti) C ada4850 -2 f = 4.5 mhz, r l = 150 , v o = 2 v p -p 60 db dc performance input offset voltage 0.6 4.2 mv input offset voltage drift 4 v/ c input bias current 2.3 4.2 a input bias current drift 4 na/ c input bias offset current 30 na open - loop gain v o = 2.25 v to 2.75 v 83 105 db input characteristics input resistance differential/common - mode 0.5/5.0 m input capacitance 1.2 pf input common - mode voltage range ?0.2 to +2.8 v input overdrive recovery time (rise/fall) v in = +5.5 v to ?0.5 v, g = +1 50/40 ns common - mode rejection ratio v cm = 2.0 v ?85 ?110 db power - down power - down input voltage power - down ada4850 -1 / ada4850 -2 <0.7/<0.6 v enabled ada4850 -1 / ada4850 -2 >0.8/>1.7 v turn - off time 0.7 s turn - on time 50 ns power - down bias current/ power down pin enabled power - down = 5 v 0.05 0.13 ma power - down power - down = 0 v 0.02 0.2 a output characteristics output overdrive recovery time (rise/fall) v in = +1.1 v to ?0.1 v, g = +5 60/70 ns output voltage swing 0.14 to 4.83 0.07 to 4.92 v short - circuit current sinking/sourcing 118/94 ma power supply operating range 1 2.7 6 v quiescent current/amplifier 2.5 2.9 ma quiescent current (power - down)/amplifier 15 150 na positive power supply rejection +v s = +5 v to +6 v, ?v s = 0 v ?84 ?100 db negative power supply rejection +v s = +5 v, ?v s = ?0 v to ?1 v ?84 ?102 db 1 for operation on bipolar supplies, see the operating the ada4850 - 1 / ada4850 - 2 on bipolar supplies section.
data sheet ada4850- 1/ada4850 - 2 rev. d | page 5 of 14 absolute maximum rat ings table 3 . parameter rating supply voltage 12.6 v power dissipation see figure 4 power down pin voltage (?v s + 6) v common - mode input voltage range (?v s ? 0.5 ) v to (+v s + 0.5) v differential input voltage range +v s to ?v s storage temperature range ?65c to +125c operating temperature range ?40c to +125c lead temperature range (soldering 10 sec) 300c junction temperature 150c stresses at or above those listed under absolute maximum ratings may cause permanent damage to the product. this is a stress rating only; functional operation of the product at these or any other conditions above those indicated in the operational section of this specification is not implied. operation beyond the maximum operatin g conditions for extended periods may affect product reliability. thermal resistance ja is specified for the worst - case conditions, that is, ja is specified for the device soldered in the circuit board for surface - mount packages. table 4 . package type ja unit 16 - lead lfcsp 72.8 c/w 8 - lead lfcsp 80 c/w maximum power dissipation the maximum safe power dissipation for the ada4850 - 1 / ada4850 - 2 is limited by the associated rise in junction temperature (t j ) on the die. at approximately 150 c, which is the glass transition temperature, the plastic changes its propertie s. even temporarily exceeding this temperature limit may change the stresses that the package exerts on the die, permanently shifting the parametric performance of the ada4850 - 1 / ada4850 - 2 . exceeding a junction temperature of 150c for an extended period of time can result in changes in silicon devices, potentially causing degradation or loss of functionality. th e power dissipated in the package (p d ) is the sum of the quiescent power dissipation and the power dissipated in the die due to the ada4850 - 1 / ada4850 - 2 drive at the output. the quiescent power is the voltage between the supply pins (v s ) times the quiescent current (i s ). p d = quiescent power + ( total drive power ? load power ) ( ) l out l out s s s d r v r v v i v p 2 2 ? ? ? ? ? ? ? ? ? + = v out = v s /4 for r l to midsupply. ( ) ( ) l s s s d r 4 v i v p 2 / + = v out = v s /2. airflow increases heat dissipation, effectively reducing ja . in addition , more metal directly in contact with the package leads and ex posed paddle from metal traces through holes, ground, and power planes reduce ja . figure 4 shows the maximum safe power dissipation in the package vs. the ambient temperature for the lfcsp (91c/w) package on a jedec standard 4 - layer board. ja values are approximations. figure 4 . maximum power dissipation vs. temperature for a 4 - layer board esd caution ?55 125 ?45 ?35 ?25 ?15 ?5 5 15 25 35 45 55 65 75 85 95 105 115 maximum power dissipation (w) ambient temperature ( c) 05320-055 0 3.0 2.5 2.0 1.5 1.0 0.5 lfcsp-8 lfcsp-16 t j = 150c
ada4850-1/ada4850-2 data sheet rev. d | page 6 of 14 typical performance characteristics t a = 25c, r f = 0 for g = +1, r f = 1 k for g > +1, r l = 1 k, unless otherwise noted. figure 5. small signal frequency response for various gains figure 6. small signal frequency response for various loads figure 7. small signal frequency response for various supplies figure 8. small signal frequency response for various capacitor loads figure 9. 0.1 db flatness response figure 10. large frequency response for various loads normalized closed-loop gain (db) 05320-044 frequency (mhz) ?6 ?5 ?4 ?3 ?2 ?1 0 1 1 10 100 v s = 5v r l = 150 ? v out = 0.1v p-p g = +10 g = ?1 g = +2 closed-loop gain (db) 1 100 10 1000 05320-045 frequency (mhz) ?6 ?4 ?5 ?2 ?3 0 ?1 2 1 v s = 5v g = +1 v out = 0.1v p-p r l = 150 ? r l = 1k ? closed-loop gain (db) 05320-046 frequency (mhz) ?6 ?5 ?4 ?3 ?2 ?1 0 1 2 3 1 100 10 1000 v s = 5v v s = 3v g = +1 r l = 150 ? v out = 0.1v p-p closed-loop gain (db) 1 100 10 300 05320-007 frequency (mhz) ?6 ?4 ?5 ?2 ?3 0 ?1 2 1 4 3 g = +1 v s = 5v r l = 1k? v out = 0.1v p-p 6pf 1pf 0pf 6.2 5.4 100k 100m 05320-047 frequency (hz) gain (db) 6.1 6.0 5.9 5.8 5.7 5.6 5.5 1m 10m v s = 5v g = +2 r l = 150 ? v s = 5v, v out = 0.1v p-p v s = 5v, v out = 2v p-p v s = 5v, v out = 1.4v p-p v s = 3v, v out = 0.5v p-p closed-loop gain (db) 1 100 10 1000 05320-048 frequency (mhz) ?7 ?5 ?6 ?3 ?4 ?1 ?2 1 0 v s = 5v g = +1 v out = 0.5v p-p r l = 150 ? r l = 1k ?
data sheet ada4850-1/ada4850-2 rev. d | page 7 of 14 figure 11. small signal frequency response for various temperatures figure 12. small signal frequency response for various temperatures figure 13. open-loop gain and phase vs. frequency figure 14. slew rate vs. output voltage figure 15. supply current vs. power-down voltage figure 16. crosstalk vs. frequency 3 ?5 1 1000 05320-057 frequency (mhz) closed-loop gain (db) 2 1 0 ?1 ?2 ?3 ?4 10 100 v s = 3v g = +1 r l = 1k ? v out = 0.1v p-p +125 ?c ?40 ?c +25 ?c +85 ?c 3 ?5 1 1000 05320-098 frequency (mhz) closed-loop gain (db) 2 1 0 ?1 ?2 ?3 ?4 10 100 v s = 5v g = +1 r l = 1k ? v out = 0.1v p-p +125 ?c ?40 ?c +25 ?c +85 ?c ?20 0 20 40 60 80 100 120 open-loop gain (db) open-loop phase (degrees) 100k 10k 100 1k 10 1m 10m 100m 1g frequency (hz) 05320-012 phase gain v s = 5v 140 ?240 ?210 ?180 ?150 ?120 ?90 ?60 ?30 0 0 100 200 150 50 300 250 slew rate (v/ ? s) 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 output voltage step (v) 05320-024 g = +2 v s = 5v r l = 1k ? 5.0 positive slew rate negative slew rate supply current ( ?a) power-down voltage (v) 05320-036 0.1 10k 0 5.0 1 10 100 1k 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 v s = 3v, 5v, ada4850-2 v s = 3v, 5v, ada4850-1 power down v s = 3v, 5v, ada4850-1 enable crosstalk (db) frequency (hz) 1m 100k 10m 100m 05320-037 v out 1 to v out 2 ?100 ?90 ?80 ?70 ?60 ?50 ?40 v out 2 to v out 1 g = +2 v s = 5v r l = 150 ? v out = 2v p-p
ada4850-1/ada4850-2 data sheet rev. d | page 8 of 14 figure 17. harmonic distortion vs. frequency for various loads figure 18. harmonic distortion vs. frequency for various v out figure 19. small signal transient response for various supplies figure 20. small signal transient response for capacitive load figure 21. large signal transient response figure 22. large signal transient response for various supplies ? 40 ?110 0.1 100 05320-102 frequency (mhz) harmonic distortion (dbc) ?50 ?60 ?70 ?80 ?90 ?100 11 0 r l = 150 ? hd2 r l = 1k ? hd3 r l = 1k ? hd2 r l = 150 ? hd3 g = +1 v s = 5v v out = 500mv p-p ? 50 ?120 0.1 100 05320-103 frequency (mhz) harmonic distortion (dbc) ?60 ?70 ?80 ?90 ?100 ?110 11 0 g = +2 v s = 5v r l = 1k ? v out = 200mv p-p hd2 v out = 500mv p-p hd2 v out = 200mv p-p hd3 v out = 500mv p-p hd3 0.35 0.40 0.45 0.50 0.55 0.60 0.65 output voltage (v) time (ns) 50 0 100 150 200 05320-019 g = +2 r l = 1k ? v s = 5v output voltage (v) 0 20 40 60 80 100 120 140 160 180 200 time (ns) 05320-020 2.425 2.450 2.475 2.525 2.550 2.575 2.500 g = +1 v s = 5v r l = 150 ? 10pf 0pf 1.75 2.00 2.25 2.50 2.75 3.00 3.25 output voltage for 5v supply (v) time (ns) 50 0 100 150 200 05320-050 g = +2 r l = 1k ? v s = 5v 2.125 2.250 2.375 2.500 2.625 2.750 2.875 output voltage for 5v supply (v) time (ns) 50 0 100 150 200 05320-049 g = +1 r l = 1k? v s = 5v v s = 3v 0.125 0.250 0.375 0.625 0.750 0.875 output voltage for 3v supply (v) 0.500
data sheet ada4850-1/ada4850-2 rev. d | page 9 of 14 figure 23. enable/disable time figure 24. input overdrive recovery figure 25. output overdrive recovery figure 26. voltage noise vs. frequency figure 27. current noise vs. frequency figure 28. input offset voltage distribution ?1 0 1 2 3 4 5 6 voltage (v) 03 0 15 45 05320-025 time ( ? s) g = +2 v s = 5v f in = 400khz v out v disable 5.5 ?0.5 0 1000 05320-058 time (ns) input and output voltage (v) 100 200 300 400 500 600 700 800 900 input output g = +1 v s = 5v r l = 150 ? f = 1mhz 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 ?0.5 0 1000 05320-060 time (ns) input and output voltage (v) 2.5 100 200 300 400 500 600 700 800 900 5 ? input output 3.0 2.0 1.5 1.0 0.5 0 3.5 g = +5 v s = 3v r l = 150 ? f = 1mhz 1 voltage noise (nv/ hz) 100k 10k 100 1k 10 1m 10m 100m frequency (hz) 05320-059 1000 10 100 1 current noise (pa/ hz) 100k 10k 100 1k 10 1m 10m 100m 1g frequency (hz) 05320-095 100 10 350 0 ?4 4 05320-065 v offset (mv) count 300 250 200 150 100 50 ?3 ?2 ?1 0 1 2 3 v s = 5v n = 1720 x = 450? v ? = 750 ? v
ada4850-1/ada4850-2 data sheet rev. d | page 10 of 14 figure 29. input offset voltage vs. common-mode voltage figure 30. output saturation voltage vs. load current (voltage differential from rails) figure 31. power-down bias current vs. temperature for various supplies figure 32. input bias current vs. temperature for various supplies figure 33. output saturation voltage vs. temperature (voltage differential from rails) figure 34. current vs. temperature for various supplies 400 200 ?1.0 3.5 05320-063 v cm (v) v os ( ? v) 380 360 340 320 300 280 260 240 220 ?0.5 0 0.5 1.0 1.5 2.0 2.5 3.0 v s = 5v 0.6 0 050 05320-064 load current (ma) output saturation voltage (v) 0.5 0.4 0.3 0.2 0.1 5 1015202530354045 v s = 3v ?v sat +v sat v s = 5v ?30 ?46 ?44 ?42 ?40 ?38 ?36 ?34 ?32 ?40 125 05320-091 temperature ( ?c) power-down pin bias current ( ? a) ?25?105 203550658095110 v s = 3v v s = 5v ?1.2 ?2.4 ?2.2 ?2.0 ?1.8 ?1.6 ?1.4 ?40 125 05320-092 temperature ( ?c) input bias current ( ? a) ?25?105 203550658095110 v s = 3v +i b ?i b v s = 5v 95 65 ?40 125 05320-062 temperature ( ?c) output saturation voltage (mv) 90 85 80 75 70 ?25?105 203550658095110 +v s ? v out ?v s ? v out v s = 5v r l = 1k ? 4.9 4.2 4.3 4.4 4.5 4.6 4.7 4.8 ?40 125 05320-090 temperature ( ?c) supply current (ma) ?25?105 203550658095110 v s = 5v v s = 3v
data sheet ada4850-1/ada4850-2 rev. d | page 11 of 14 figure 35. power supply reje ction (psr) vs. frequency figure 36. input offset voltage vs. temperature for various supplies figure 37. common-mode rejection (cmr) vs. frequency 05320-094 frequency (hz) power supply rejection (db) ?10 ?20 ?30 ?40 ?50 ?60 ?70 ?80 ?90 ?100 0 ?110 100 1m 100k 1k 10k 10m 100m v s = 5v +psr ?psr 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 ?0.1 ?40 125 05320-093 temperature ( ?c) input offset voltage (mv) ?25?105 203550658095110 v s = 5v v s = 3v ?20 ?120 1k 05320-034 frequency (hz) common-mode rejection (db) ?30 ?40 ?50 ?60 ?70 ?80 ?90 ?100 ?110 10k 100k 1m 10m 100m v s = 5v channel 1 channel 2
ada4850- 1/ada4850 - 2 data sh eet rev. d | page 12 of 14 circuit description t he ada4850 - 1 / ada4850 - 2 feature a high slew rate input stage that is a true single - supply topology, capable of sensing signals at or below the negative supply rail. the rail - to - rail output s tage can swing to within 80 mv of either supply rail when driving light loads and within 0.17 v when driving 150 ?. high speed performance is maintained at supply voltages as lo w as 2.7 v. headroom and overdri ve recovery considerations input the ada4850 - 1 / ada4850 - 2 are designed for use in low voltage systems. to obtain optimum performance, it is useful to understand the behavior of the amplifier as input and output signals approach the headroom limits of the amplifier. the input common - mode voltage range extends 200 mv below the negative supply voltage or ground for single - supply operation to within 2.2 v of the positive supply voltage. therefore, in a gain of +3, the ada4850 - 1 / ada4850 - 2 can provide full rail - to - rail output swing for supply voltage as low as 3.3 v, assuming the input signal swing is from ?v s (or ground) to 1.1 v. exceeding the headroom limit is not a concer n for any inverting gain on any supply voltage, as long as the reference voltage at the positive input of the amplifier lies within the input common - mode range of the amplifier. the input stage sets the headroom limit for signals when the amplifier is used in a gain of +1 for signals approaching the positive rail. for high speed signals, however, there are other considerations. figure 38 shows ?3 db bandwidth vs. dc inp ut voltage for a unity - gain follower. as the common - mode voltage approaches the positive supply, the bandwidth begins to drop when within 2 v of +v s . this can manifest itself in increased distortion or settling time. figure 38 . unity - gain follower bandwidth vs. frequency for various input common - mode higher frequency signals require more headroom than the lower frequencies to maintain distortion performance. figure 39 illust rates how the rising edge settling time for the amplifier configured as a unity - gain follower stretches out as the top of a 1 v step input approaches and exceeds the specified input comm on - mode voltage limit. figure 39 . pulse response, input headroom limits the recovery time from input voltages 2.2 v or closer to the positive supply is approximately 50 ns, which is limited by the settling artifacts caused by tr ansistors in the input stage coming out of saturation. the ada4850 - 1 / ada4850 - 2 do not exhibit phase reversal, even for input voltages beyond the voltage supply rails. going more than 0.6 v beyond the power supplies turns on protection diodes at the input stage, which greatly increase the current draw of the devices. output for signals approaching the negative supp ly and inverting gain, and high positive gain configurations, the headroom limit is the output stage. the ada4850 - 1 / ada4850 - 2 amplifiers use a common - emitter output stage. this output stage maximizes the available output range, limited by the saturation voltage of the output transistors. the saturation voltage increases with drive current, due to the output transi stor collector resistance. as the saturation point of the output stage is approached, the output signal shows increasing amounts of compression and clipping. as in the input headroom case, higher frequency signals require a bit more headroom than the lowe r frequency signals. output overload recovery is typically within 40 ns after the input of the amplifier is brought to a nonoverloading value. 2 ? 6 0.1 1000 05320-096 frequency (mhz) gain (db) 1 0 ? 1 ? 2 ? 3 ? 4 ? 5 1 10 100 v s = 5v g = +1 r l = 1k ? v out = 0.1v p-p v cm = 3v v cm = 3.1v v cm = 3.2v v cm = 3.3v 3.6 1.8 0 100 05320-061 time (ns) output voltage (v) 3.4 3.2 3.0 2.8 2.6 2.4 2.2 2.0 10 20 30 40 50 60 70 80 90 v s = 5v g = +1 r l = 1k ? v step = 2v to 3v v step = 2.4v to 3.4v v step = 2.3v to 3.3v v step = 2.2v to 3.2v v step = 2.1v to 3.1v
data sheet ada4850- 1/ada4850 - 2 rev. d | page 13 of 14 figure 40 shows the output recovery transients for the amplifier recovering from a saturated output from the top and bottom supplies to a point at midsupply. figure 40 . overlo ad recovery operating the ada4850 - 1 / ada4850 - 2 on bipolar supplies the ada4850 - 1 / ada4850 - 2 can operate on bipolar supplies up to 5 v. the only restriction is that the voltage between ?v s and the power down pin must not exceed 6 v. voltage differences greater than 6 v can cause permanent damage to the amplifier. for example, when operating on 5 v supplies, the power down pin must not exceed +1 v. power - down pins the ada4850 - 1 / ada4850 - 2 feature an ultralow power - down mode that lowers the supply current to less than 150 na. when a power - down pin is brought to within 0.6 v of the n egative supply, the amplifier is powered down. table 5 outlines the power - down p i n s functionality. to ensure proper operation, do not leave the power - down pins (pd 1, pd2 ) floating. table 5 . power - down pins functionality 3 v and 5 v supply voltage ada4850 - 1 ada4850 - 2 power down 0 v to 0.7 v 0 v to 0.6 v enabled 0.8 to +v s 1.7 v to +v s 6.5 ? 1.5 0 100 05320-042 time (ns) input and output voltage (v) 5.5 4.5 3.5 2.5 1.5 0.5 ? 0.5 10 20 30 40 50 60 70 80 90 v s = 5v g = ? 1 r l = 1k ? input voltage edges v out = +2.5v to 0v v out = ? 2.5v to 0v
ada4850-1/ada4850-2 data sheet rev. d | page 14 of 14 outline dimensions figure 41. 8-lead lead frame chip scale package [lfcsp] 3 mm 3 mm body and 0.75 mm package height (cp-8-13) dimensions shown in millimeters figure 42. 16-lead lead frame chip scale package [lfcsp] 3 mm 3 mm body and 0.75 mm package height (cp-16-21) dimensions shown in millimeters ordering guide model 1 temperature range package description package option branding ADA4850-1YCPZ-RL7 ?40c to +125c 8-lead lead frame chip scale package [lfcsp] cp-8-13 hwb ada4850-2ycpz-rl ?40c to +125c 16-lead lead frame chip scale package [lfcsp] cp-16-21 htb ada4850-2ycpz-rl7 ?40c to +125c 16-lead lead frame chip scale package [lfcsp] cp-16-21 htb ada4850-2ycp-ebz evaluation board for 16-lead lfcp 1 z = rohs compliant part. top view 8 1 5 4 0.30 0.25 0.20 bottom view pin 1 index area seating plane 0.80 0.75 0.70 1.55 1.45 1.35 1.84 1.74 1.64 0.203 ref 0.05 max 0.02 nom 0.50 bsc exposed pad 3.10 3.00 sq 2.90 for proper connection of the exposed pad, refer to the pin configuration and function descriptions section of this data sheet. coplanarity 0.08 0.50 0.40 0.30 compliant to jedec standards mo-229-weed 12-07-2010-a p i n 1 i n d i c a t o r ( r 0 . 1 5 ) 1.45 1.30 sq 1.15 111808-a 1 0.50 bsc bottom view top view 16 5 8 9 12 13 4 exposed pad p i n 1 i n d i c a t o r 3.10 3.00 sq 2.90 0.50 0.40 0.30 seating plane 0.05 max 0.02 nom 0.20 ref 0.25 min coplanarity 0.08 pin 1 indicator 0.30 0.23 0.18 compliant to jedec standards mo-220-weed. for proper connection of the exposed pad, refer to the pin configuration and function descriptions section of this data sheet. 0.80 0.75 0.70 ?2005C2016 analog devices, inc. all rights reserved. trademarks and registered trademarks are the prop erty of their respective owners. d05320-0-5/16(d)

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