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low cost, high speed, rail-to-rail, output op amps ada4851-1/ada4851-2/ada4851-4 rev. j 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 ?2004C2010 analog devices, inc. all rights reserved. features qualified for automotive applications high speed 130 mhz, ?3 db bandwidth 375 v/s slew rate 55 ns settling time to 0.1% excellent video specifications 0.1 db flatness: 11 mhz differential gain: 0.08% differential phase: 0.09 fully specified at +3 v, +5 v, and 5 v supplies rail-to-rail output output swings to within 60 mv of either rail low voltage offset: 0.6 mv wide supply range: 2.7 v to 12 v low power: 2.5 ma per amplifier power-down mode available in space-saving packages 6-lead sot-23, 8-lead msop, and 14-lead tssop applications automotive infotainment systems automotive driver assistance systems consumer video professional video video switchers active filters clock buffers pin configurations v out 1 +in 3 2 ada4851-1 top view (not to scale) ?v s +v s 6 ?in 4 5 power down 05143-001 figure 1. ada4851-1, 6-lead sot-23 (rj-6) out1 1 ?in1 2 +in1 3 ?v s 4 +v s 8 out 7 ?in2 6 +in2 5 ada4851-2 top view (not to scale) 05143-058 figure 2. ada4851-2, 8-lead msop (rm-8) 1 2 3 4 5 6 7 ada4851-4 top view (not to scale) ?in 1 +in 1 +v s v out 2 ?in 2 +in 2 v out 1 14 13 12 11 10 9 8 ?in 4 +in 4 ?v s v out 3 ?in 3 +in 3 v out 4 05143-054 figure 3. ada4851-4, 14-lead tssop (ru-14) general description the ada4851-1 (single), ada4851-2 (dual), and ada4851-4 (quad) are low cost, high speed, voltage feedback rail-to-rail output op amps. despite their low price, these parts provide excellent overall performance and versatility. the 130 mhz, ?3 db bandwidth and high slew rate make these amplifiers well suited for many general-purpose, high speed applications. the ada4851 family is designed to operate at supply voltages as low as +3 v and up to 5 v. these parts provide 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. on the output, the amplifiers can swing within 60 mv of either supply rail. with their combination of low price, excellent differential gain (0.08%), differential phase (0.09o), and 0.1 db flatness out to 11 mhz, these amplifiers are ideal for consumer video applications. the ada4851-1w, ada4851-2w, and ada4851-4w are automotive grade versions, qualified for automotive applications. see the automotive products section for more details. the ada4851 family is designed to work over the extended temperature range (?40c to +125c). closed-loop gain (db) 1 100 10 1k 05143-004 frequency (mhz) ?6 ?4 ?5 ?2 ?3 0 ?1 2 1 4 3 g = +1 v s = 5v r l = 1k c l = 5pf figure 4. small-signal frequency response
ada4851-1/ada4851-2/ada4851-4 rev. j | page 2 of 24 table of contents features .............................................................................................. 1 ? applications ....................................................................................... 1 ? pin configurations ........................................................................... 1 ? general description ......................................................................... 1 ? revision history ............................................................................... 2 ? specifications ..................................................................................... 4 ? specifications with +3 v supply ................................................. 4 ? specifications with +5 v supply ................................................. 6 ? specifications with 5 v supply ................................................. 8 ? absolute maximum ratings .......................................................... 10 ? thermal resistance .................................................................... 10 ? esd caution................................................................................ 10 ? typical performance characteristics ........................................... 11 ? circuit description......................................................................... 17 ? headroom considerations ........................................................ 17 ? overload behavior and recovery ............................................ 18 ? single-supply video amplifier ................................................. 19 ? video reconstruction filter ...................................................... 19 ? outline dimensions ....................................................................... 20 ? ordering guide .......................................................................... 21 ? automotive products ................................................................. 21 ? revision history 10/10rev. i to rev. j added output characteristics, linear output current parameter, table 2 ............................................................................. 7 added output characteristics, linear output current parameter, table 3 ............................................................................. 9 5/10rev. h to rev. i changes to power-down bias current parameter, table 1 ........ 3 moved automotive products section .......................................... 20 4/10rev. g. to rev. h added automotive product information ................... throughout changes to table 1 through table 3 .............................................. 3 updated outline dimensions ....................................................... 19 changes to ordering guide .......................................................... 20 9/09rev. f. to rev. g moved automotive products section .......................................... 18 updated outline dimensions ....................................................... 19 5/09rev. e. to rev. f changes to features, applications, and general description sections .............................................................................................. 1 changes to table 1 ............................................................................ 3 changes to table 2 ............................................................................ 5 changes to table 3 ............................................................................ 7 changes to figure 27 and figure 28 ............................................. 13 changes to figure 47, added automotive products section ... 18 updated outline dimensions ....................................................... 19 changes to ordering guide .......................................................... 20 8/07rev. d to rev. e changes to applications ................................................................... 1 changes to common-mode rejection ratio, conditions ........... 5 changes to headroom considerations section ......................... 13 4/06rev. c to rev. d added video reconstruction filter section ............................... 15 5/05rev. b to rev. c changes to general description ..................................................... 1 changes to input section .............................................................. 14 4/05rev. a to rev. b added ada4851-2, added 8-lead msop ..................... universal changes to features .......................................................................... 1 changes to general description ..................................................... 1 changes to table 1 ............................................................................. 3 changes to table 2 ............................................................................. 4 changes to table 3 ............................................................................. 5 changes to table 4 and figure 5 ...................................................... 6 changes to figure 12, figure 15, and figure 17 ............................ 8 changes to figure 18 ......................................................................... 9 changes to figure 28 caption ...................................................... 10 changes to figure 33 ...................................................................... 11 changes to figure 36 and figure 38, added figure 39 ............. 12 changes to circuit description section ...................................... 13 changes to headroom considerations section ......................... 13 changes to overload behavior and recovery section .............. 14 added single-supply video amplifier section .......................... 15 updated outline dimensions ....................................................... 16 changes to ordering guide .......................................................... 17
ada4851-1/ada4851-2/ada4851-4 rev. j | page 3 of 24 1/05rev. 0 to rev. a added ada4851-4 ............................................................ universal added 14-lead tssop...................................................... universal changes to features ..........................................................................1 changes to general description .....................................................1 changes to figure 3...........................................................................1 changes to specifications.................................................................3 changes to figure 4...........................................................................6 changes to figure 8...........................................................................7 changes to figure 11 ........................................................................8 changes to figure 22 ........................................................................9 changes to figure 23, figure 24, and figure 25..........................10 changes to figure 27 and figure 28 .............................................10 changes to figure 29, figure 30, and figure 31..........................11 changes to figure 34 ......................................................................11 added figure 37 ..............................................................................12 changes to ordering guide...........................................................15 updated outline dimensions........................................................15 10/04revision 0: initial version
ada4851-1/ada4851-2/ada4851-4 rev. j | page 4 of 24 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 noted. table 1. parameter conditions/comments min typ max unit dynamic performance ?3 db bandwidth g = +1, v out = 0.1 v p-p 104 130 mhz ada4851-1w/2w/4w only: t min to t max 95 mhz g = +1, v out = 0.5 v p-p 80 105 mhz ada4851-1w/2w/4w only: t min to t max 72 mhz g = +2, v out = 1 v p-p, r l = 150 40 mhz bandwidth for 0.1 db flatness g = +2, v out = 1 v p-p, r l = 150 15 mhz slew rate g = +2, v out = 1 v step 100 v/s settling time to 0.1% g = +2, v out = 1 v step, r l = 150 50 ns noise/distortion performance harmonic distortion, hd2/hd3 f c = 1 mhz, v out = 1 v p-p, g = ?1 ?73/?79 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 out = 2 v p-p 0.44 % differential phase g = +3, ntsc, r l = 150 , v out = 2 v p-p 0.41 degrees crosstalk (rti)ada4851-2/ada4851-4 f = 5 mhz, g = +2, v out = 1.0 v p-p ?70/?60 db dc performance input offset voltage 0.6 3.3 mv ada4851-1w/2w/4w only: t min to t max 7.3 mv input offset voltage drift 4 v/c input bias current 2.3 4.0 a ada4851-1w/2w/4w only: t min to t max 5.0 a input bias current drift 6 na/c input bias offset current 20 na open-loop gain v out = 0.25 v to 0.75 v 80 105 db ada4851-1w/2w/4w only: t min to t max 78 db ada4851-1w only: t min to t max 75 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, ?0.5 v, g = +1 60/60 ns common-mode rejection ratio v cm = 0 v to 0.5 v ?81 ?103 db ada4851-1w/2w/4w only: t min to t max ?65 db power-downada4851-1 only power-down input voltage power-down <1.1 v power-up >1.6 v turn-off time 0.7 s turn-on time 60 ns power-down bias current enabled power down = 3 v 4 10 a ada4851-1w only: t min to t max 10 a power-down power down = 0 v ?14 ?20 a ada4851-1w only: t min to t max ?20 a
ada4851-1/ada4851-2/ada4851-4 rev. j | page 5 of 24 parameter conditions/comments min typ max unit output characteristics output overdrive recovery time (rise/fall) v in = +0.7 v, ?0.1 v, g = +5 70/100 ns output voltage swing 0.05 to 2.91 0.03 to 2.94 v ada4851-1w/2w/4w only: t min to t max 0.06 to 2.89 v short-circuit current sinking/sourcing 90/70 ma power supply operating range 2.7 12 v quiescent current per amplifier 2.4 2.7 ma ada4851-1w/2w/4w only: t min to t max 2.7 ma quiescent current (power-down) power down = low 0.2 0.3 ma ada4851-1w only: t min to t max 0.3 ma positive power supply rejection +v s = +2.5 v to +3.5 v, ?v s = ?0.5 v ?81 ?100 db ada4851-1w/2w/4w only: t min to t max ?81 db negative power supply rejection +v s = +2.5 v, ?v s = ?0.5 v to C1.5 v ?80 ?100 db ada4851-1w/2w/4w only: t min to t max ?80 db
ada4851-1/ada4851-2/ada4851-4 rev. j | page 6 of 24 specifications 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 noted. table 2. parameter conditions min typ max unit dynamic performance ?3 db bandwidth g = +1, v out = 0.1 v p-p 96 125 mhz ada4851-1w/2w/4w only: t min to t max 90 mhz g = +1, v out = 0.5 v p-p 72 96 mhz ada4851-1w/2w/4w only: t min to t max 64 mhz g = +2, v out = 1.4 v p-p, r l = 150 35 mhz bandwidth for 0.1 db flatness g = +2, v out = 1.4 v p-p, r l = 150 11 mhz slew rate g = +2, v out = 2 v step 200 v/s settling time to 0.1% g = +2, v out = 2 v step, r l = 150 55 ns noise/distortion performance harmonic distortion, hd2/hd3 f c = 1 mhz, v out = 2 v p-p, g = +1 ?80/?100 dbc input voltage noise f = 100 khz 10 nv/hz input current noise f = 100 khz 2.5 pa/hz differential gain g = +2, ntsc, r l = 150 , v out = 2 v p-p 0.08 % differential phase g = +2, ntsc, r l = 150 , v out = 2 v p-p 0.11 degrees crosstalk (rti)ada4851-2/ada4851-4 f = 5 mhz, g = +2, v out = 2.0 v p-p ?70/?60 db dc performance input offset voltage 0.6 3.4 mv ada4851-1w/2w/4w only: t min to t max 7.4 mv input offset voltage drift 4 v/c input bias current 2.2 3.9 a ada4851-1w/2w/4w only: t min to t max 4.9 a input bias current drift 6 na/c input bias offset current 20 na open-loop gain v out = 1 v to 4 v 97 107 db ada4851-1w/2w/4w only: t min to t max 90 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, ?0.5 v, g = +1 50/45 ns common-mode rejection ratio v cm = 0 v to 2 v ?86 ?105 db ada4851-1w/2w/4w only: t min to t max ?80 db power-downada4851-1 only power-down input voltage power-down <1.1 v power-up >1.6 v turn-off time 0.7 s turn-on time 50 ns power-down bias current enabled power down = 5 v 33 40 a ada4851-1w only: t min to t max 40 a power-down power down = 0 v ?22 ?30 a ada4851-1w only: t min to t max ?30 a
ada4851-1/ada4851-2/ada4851-4 rev. j | page 7 of 24 parameter conditions min typ max unit output characteristics output overdrive recovery time (rise/fall) v in = +1.1 v, ?0.1 v, g = +5 60/70 ns output voltage swing 0.09 to 4.91 0.06 to 4.94 v ada4851-1w/2w/4w only: t min to t max 0.11 to 4.89 v linear output current 1% thd with 1 mhz, v out = 2 v p-p 66 ma short-circuit current sinking/sourcing 110/90 ma power supply operating range 2.7 12 v quiescent current per amplifier 2.5 2.8 ma ada4851-1w/2w/4w only: t min to t max 2.8 ma quiescent current (power-down) power down = low 0.2 0.3 ma ada4851-1w only: t min to t max 0.3 ma positive power supply rejection +v s = +5 v to +6 v, ?v s = 0 v ?82 ?101 db ada4851-1w/2w/4w only: t min to t max ?82 db negative power supply rejection +v s = +5 v, ?v s = ?0 v to ?1 v ?81 ?101 db ada4851-1w/2w/4w only: t min to t max ?81 db
ada4851-1/ada4851-2/ada4851-4 rev. j | page 8 of 24 specifications 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 noted. table 3. parameter conditions min typ max unit dynamic performance ?3 db bandwidth g = +1, v out = 0.1 v p-p 83 105 mhz ada4851-1w/2w/4w only: t min to t max 75 mhz g = +1, v out = 1 v p-p 52 74 mhz ada4851-1w/2w/4w only: t min to t max 42 mhz g = +2, v out = 2 v p-p, r l = 150 40 mhz bandwidth for 0.1 db flatness g = +2, v out = 2 v p-p, r l = 150 11 mhz slew rate g = +2, v out = 7 v step 375 v/s g = +2, v out = 2 v step 190 v/s settling time to 0.1% g = +2, v out = 2 v step, r l = 150 55 ns noise/distortion performance harmonic distortion, hd2/hd3 f c = 1 mhz, v out = 2 v p-p, g = +1 ?83/?107 dbc input voltage noise f = 100 khz 10 nv/hz input current noise f = 100 khz 2.5 pa/hz differential gain g = +2, ntsc, r l = 150 , v out = 2 v p-p 0.08 % differential phase g = +2, ntsc, r l = 150 , v out = 2 v p-p 0.09 degrees crosstalk (rti)ada4851-2/ada4851-4 f = 5 mhz, g = +2, v out = 2.0 v p-p ?70/?60 db dc performance input offset voltage 0.6 3.5 mv ada4851-1w/2w/4w only: t min to t max 7.5 mv input offset voltage drift 4 v/c input bias current 2.2 4.0 a ada4851-1w/2w/4w only: t min to t max 4.5 a input bias current drift 6 na/c input bias offset current 20 na open-loop gain v out = 2.5 v 99 106 db ada4851-1w/2w/4w only: t min to t max 90 db input characteristics input resistance differential/common-mode 0.5/5.0 m input capacitance 1.2 pf input common-mode voltage range ?5.2 to +2.8 v input overdrive recovery time (rise/fall) v in = 6 v, g = +1 50/25 ns common-mode rejection ratio v cm = 0 v to ?4 v ?90 ?105 db ada4851-1w/2w/4w only: t min to t max ?86 db power-downada4851-1 only power-down input voltage power-down < ?3.9 v power-up > ?3.4 v turn-off time 0.7 s turn-on time 30 ns power-down bias current enabled power down = +5 v 100 130 a ada4851-1w only: t min to t max 130 a power-down power down = ?5 v ?50 ?60 a ada4851-1w only: t min to t max ?60 a
ada4851-1/ada4851-2/ada4851-4 rev. j | page 9 of 24 parameter conditions min typ max unit output characteristics output overdrive recovery time (rise/fall) v in = 1.2 v, g = +5 80/50 ns output voltage swing ?4.87 to +4.88 ?4.92 to +4.92 v ada4851-1w/2w/4w only: t min to t max ?4.85 to +4.85 v linear output current 1% thd with 1 mhz, v out = 2 v p-p 83 ma short-circuit current sinking/sourcing 125/110 ma power supply operating range 2.7 12 v quiescent current per amplifier 2.9 3.2 ma ada4851-1w/2w/4w only: t min to t max 3.2 ma quiescent current (power-down) power down = low 0.2 0.325 ma ada4851-1w only: t min to t max 0.325 ma positive power supply rejection +v s = +5 v to +6 v, ?v s = ?5 v ?82 ?101 db ada4851-1w/2w/4w only: t min to t max ?82 db negative power supply rejection +v s = +5 v, ?v s = ?5 v to ?6 v ?81 ?102 db ada4851-1w/2w/4w only: t min to t max ?81 db
ada4851-1/ada4851-2/ada4851-4 rev. j | page 10 of 24 absolute maximum ratings p d = quiescent power + ( total drive power ? load power ) table 4. arameter ratin supply voltage 12.6 v power dissipation see figure 5 common-mode input voltage ?v s ? 0.5 v to +v s + 0.5 v differential input voltage +v s to ?v s storage temperature range ?65c to +125c operating temperature range ?40c to +125c lead temperature jedec j-std-20 junction temperature 150c () l out l out s ss d r v r vv ivp 2 C 2 ? ? ? ? ? ? += rms output voltages should be considered. if r l is referenced to ?v s , as in single-supply operation, the total drive power is v s i out . if the rms signal levels are indeterminate, consider the worst case, when v out = v s /4 for r l to midsupply. () ( ) l s ss d r v ivp 2 4/ += 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. in single-supply operation with r l referenced to ?v s , the worst case is v out = v s /2. airflow increases heat dissipation, effectively reducing ja . in addition, more metal directly in contact with the package leads and through holes under the device reduces ja . figure 5 shows the maximum safe power dissipation in the package vs. the ambient temperature for the 6-lead sot-23 (170c/w), the 8-lead msop (150c/w), and the 14-lead tssop (120c/w) on a jedec standard 4-layer board. ja values are approximations. thermal resistance ja is specified for the worst-case conditions; that is, ja is specified for device soldered in circuit board for surface-mount packages. 0 2.0 ?55 125 maximum power dissipation (w) 05143-057 ambient temperature ( c) 1.5 1.0 0.5 ?45?35?25?15?5 5 152535455565758595105115 sot-23-6 tssop msop table 5. thermal resistance acae te ja nit 6-lead sot-23 170 c/w 8-lead msop 150 c/w 14-lead tssop 120 c/w maximum power dissipation the maximum safe power dissipation for the ada4851-1/ ada4851-2/ada4851-4 is limited by the associated rise in junction temperature (t j ) on the die. at approximately 150c, which is the glass transition temperature, the plastic changes its properties. even temporarily exceeding this temperature limit may change the stresses that the package exerts on the die, permanently shifting the parametric performance of the amplifiers. exceeding a junction temperature of 150c for an extended period can result in changes in silicon devices, potentially causing degradation or loss of functionality. figure 5. maximum power dissipation vs. temperature for a 4-layer board esd caution the 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 drive of the amplifier at the output. the quiescent power is the voltage between the supply pins (v s ) times the quiescent current (i s ).
ada4851-1/ada4851-2/ada4851-4 rev. j | page 11 of 24 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. closed-loop gain (db) 1 100 10 05143-006 frequency (mhz) ?7 ?5 ?6 ?3 ?4 ?1 ?2 1 0 v s = 5v r l = 150 v out = 0.1v p-p g = ?1 g = +2 g = +10 figure 6. small-signal frequency response for various gains ?6 ?5 ?4 ?3 ?2 ?1 0 1 closed-loop gain (db) 1 100 10 300 05143-009 frequency (mhz) v s = 5v g = +1 v out = 0.1v p-p r l = 150 r l = 1k figure 7. small-signal frequency response for various loads closed-loop gain (db) 1 100 10 300 05143-007 frequency (mhz) ?6 ?4 ?5 ?2 ?3 0 ?1 2 1 g = +1 r l = 150 v out = 0.1v p-p v s = +5v v s = 5v figure 8. small-signal frequency response for various supplies closed-loop gain (db) 1 100 10 300 05143-010 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 10pf 5pf 0pf figure 9. small-signal frequency response for various capacitive loads ?6 ?5 ?4 ?3 ?2 ?1 0 1 closed-loop gain (db) 1 100 10 05143-008 frequency (mhz) ?40 c +25 c +85 c +125c v s = 5v g = +1 v out = 0.1v p-p 300 figure 10. small-signal frequency response for various temperatures closed-loop gain (db) 1 100 10 05143-012 frequency (mhz) ?7 ?5 ?6 ?3 ?4 ?1 ?2 1 0 v s = 5v r l = 150 v out = 1v p-p g = +10 g = ?1 g = +2 figure 11. large-signal frequency response for various gains
ada4851-1/ada4851-2/ada4851-4 rev. j | page 12 of 24 5.4 6.2 0.1 100 closed-loop gain (db) 05143-021 frequency (mhz) 11 0 6.1 6.0 5.9 5.8 5.7 5.6 5.5 v s = 5v g = +2 r l = 150 r f = 1k v out = 100mv p-p v out = 1v p-p v out = 2v p-p figure 12. 0.1 db flatness response for various output amplitudes ?6 ?5 ?4 ?3 ?2 ?1 0 1 closed-loop gain (db) 1 100 10 300 05143-015 v s = 5v g = +1 v out = 1v p-p r l = 1k r l = 150 frequency (mhz) figure 13. large frequency response for various loads ?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) 05143-029 phase gain v s = 5v 140 ?240 ?210 ?180 ?150 ?120 ?90 ?60 ?30 0 figure 14. open-loop gain and phase vs. frequency ?110 ? 40 0.1 10 harmonic distortion (dbc) 05143-014 frequency (mhz) 1 ?50 ?60 ?70 ?80 ?90 ?100 g = ? 1 v s = 3v r l = 150 ? v out = 2v hd3 hd2 figure 15. harmonic distortion vs. frequency ?120 ?110 ?100 ?90 ?80 ?70 ?60 ? 50 harmonic distortion (dbc) 012345678910 output amplitude (v p-p) 05143-017 g = +2 v s = 5v r l = 1k f = 2mhz hd2 hd3 figure 16. harmonic distortion vs. output amplitude 0.1 10 harmonic distortion (dbc) 05143-016 frequency (mhz) 1 ? 40 ?50 ?60 ?70 ?80 ?90 ?100 ?110 r l = 1k ? hd2 r l = 150 ? hd2 r l = 1k ? hd3 r l = 150 ? hd3 g = +1 v out = 2v p-p v s =5v figure 17. harmonic distortion vs. frequency for various loads
ada4851-1/ada4851-2/ada4851-4 rev. j | page 13 of 24 ? 40 0.1 10 harmonic distortion (dbc) 05143-013 frequency (mhz) 1 ?50 ?60 ?70 ?80 ?90 ?100 ?110 g = +1 v out = 2v p-p v s = 5v r l = 1k ? hd2 r l = 150 ? hd2 r l = 1k ? hd3 r l = 150 ? hd3 figure 18. harmonic distortion vs. frequency for various loads ?6 ?4 ?2 ?3 ?5 0 ?1 input and output voltage (v) 2 1 4 3 6 5 0 100 200 300 400 500 600 700 800 900 1k time (ns) 05143-019 g = +5 v s = 5v r l = 150 f = 1mhz 5 input output figure 19. output overdrive recovery ?6 ?4 ?2 ?3 ?5 0 ?1 input and output voltage (v) 2 1 4 3 6 5 0 100 200 300 400 500 600 700 800 900 1k time (ns) 05143-022 g = +1 v s = 5v r l = 150 f = 1mhz input output figure 20. input overdrive recovery ?0.075 ?0.050 ?0.025 0 0.025 0.050 0.075 output voltage for 5v supply (v) time (ns) 50 0 100 150 200 05143-024 v s = +5v v s = 5v g = +1 or +2 r l = 1k 2.425 2.450 2.475 2.500 2.525 2.550 2.575 output voltage for 5v supply (v) figure 21. small-signal transient response for various supplies output voltage (v) 0 20 40 60 80 100 120 140 160 180 200 time (ns) 05143-026 2.425 2.450 2.475 2.525 2.550 2.575 2.500 g = +1 v s = 5v r l = 150 10pf 0pf figure 22. small-signal transient response for various capacitive loads ?1.5 ?1.0 ?0.5 0 0.5 1.0 1.5 output voltage for 5v supply (v) 0 0.5 1.0 1.5 2.0 2.5 3.0 output voltage for 5v supply (v) time (ns) 50 0 100 150 200 05143-028 v s = +5v v s = 5v g = +2 r l = 150 figure 23. large-signal transient response for various supplies
ada4851-1/ada4851-2/ada4851-4 rev. j | page 14 of 24 ?1.5 ?1.0 ?0.5 0 0.5 1.0 1.5 output voltage for 5v supply (v) 0 0.5 1.0 1.5 2.0 2.5 3.0 output voltage for 5v supply (v) time (ns) 50 0 100 150 200 05143-027 v s = +5v v s = 5v g = +1 r l = 150 figure 24. large-signal transient response for various supplies 0 0.1 0.2 0.3 0.4 0.5 0 5 10 15 20 25 30 35 dc voltage differential from v s (v) 05143-049 load current (ma) +v s ? v out v s = +3v v s = 5v ?v s ? v out figure 25. output saturation voltage vs. load current 0 200 400 300 100 600 500 slew r a te (v/s) 0123456789 output voltage step (v p-p) 05143-032 g = +2 v s = 5v r l = 1k ? 25% to 75% of v out 10 positive slew rate negative slew rate figure 26. slew rate vs. output voltage step ?1 0 1 2 3 4 5 6 vol t age (v) 03 0 15 45 05143-033 time (s) g = +2 v s = 5v f in = 400khz v out v power down figure 27. ada4851-1, power-up/power-down time 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 supply current (ma) ?5 ?4 ?3 ?2 ?1 0 1 2 3 4 5 power down voltage (v) 05143-034 v s = 5v v s = +5v v s = +3v figure 28. ada4851-1, supply current vs. power down pin voltage input offset voltage ( v) temperature ( c) 05143-035 ?40 ?25 ?10 5 20 35 50 65 80 95 110 125 ?400 ?300 ?200 ?100 0 100 200 300 v s = 5v v s = +5v v s = +3v figure 29. input offset voltage vs. temperature for various supplies
ada4851-1/ada4851-2/ada4851-4 rev. j | page 15 of 24 input bias current ( a) temperature ( c) 05143-036 1.2 1.4 1.6 1.8 2.0 2.2 ?40 ?25 ?10 5 20 35 50 65 80 95 110 125 i b +, v s = +5v i b ?, v s = +5v i b +, v s = 5v i b ?, v s = 5v figure 30. input bias current vs. temperature for various supplies dc voltage differential from v s (v) temperature ( c) 05143-037 0.04 0.05 0.06 0.07 0.08 0.09 ?40 ?25 ?10 5 20 35 50 65 80 95 110 125 +v s ? v out v s = 5v v s = +5v ?v s ? v out +v s ? v out ?v s ? v out figure 31. output saturation vs. temperature for various supplies supply current (ma) temperature ( c) 05143-038 2.0 2.2 2.4 2.6 2.8 3.0 ?40 ?25 ?10 5 20 35 50 65 80 95 110 125 v s = 5v v s = +5v 3.2 v s = +3v figure 32. supply current vs. temperature for various supplies 1 1000 10 100m voltage noise (nv/ hz) 05143-044 frequency (hz) 100 1k 10k 100k 1m 10m 10 100 g = +1 figure 33. voltage noise vs. frequency current noise (pa/ hz) 100 1k 10k 100k 1m 10m 100m frequency (hz) 05143-045 1 10 100 g = +2 10 figure 34. current noise vs. frequency 0 10 20 30 40 50 60 70 80 ?4 ?3 ?2 ?1 0 1 2 3 4 count v os (mv) 05143-047 v s = 5v n = 420 x = ?260v = 780v figure 35. input offset voltage distribution
ada4851-1/ada4851-2/ada4851-4 rev. j | page 16 of 24 crosstalk (db) frequency (mhz) ?100 ?90 ?80 ?70 ?60 ?50 ?40 ?30 ?20 ?10 0 05143-055 0.1 1 10 100 drive amps 1, 2, and 4 listen amp 3 drive amp 1 listen amp 2 g = +2 v s = 5v r l = 1k v in = 1v p-p common-mode rejection (db) frequency (hz) 05143-020 1k 10k 100k 1m 10m 100m 1g v s = 5v ?120 ?110 ?90 ?50 ?30 ?70 ?100 ?60 ?40 ?80 figure 38. ada4851-4, rti crosstalk vs. frequency figure 36. common-mode rejection ratio (cmrr) vs. frequency ?100 0 0.1 crosstalk (db) 05143-060 frequency (mhz) 1 10 100 ?10 ?20 ?30 ?40 ?50 ?60 ?70 ?80 ?90 g = +2 v s = 5v r l = 1k v in = 1v p-p drive amp 1 listen amp 2 drive amp 2 listen amp 1 ?110 ?100 ?80 ?40 ?20 0 ?60 ?90 ?50 ?30 ?10 ?70 power supply rejection (db) 100 1k 10k 100k 1m 10m 100m 1g frequency (hz) 05143-023 v s = 5v +psr ?psr figure 39. ada4851-2, rti crosstalk vs. frequency figure 37. power supply reje ction (psr) vs. frequency
ada4851-1/ada4851-2/ada4851-4 rev. j | page 17 of 24 circuit description the ada4851-1/ada4851-2/ada4851-4 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 stage can pull within 60 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 low as 2.7 v. headroom considerations these amplifiers are designed for use in low voltage systems. to obtain optimum performance, it is useful to understand the behavior of the amplifiers as input and output signals approach the headroom limits of the amplifiers. the input common-mode voltage range of the amplifiers extends from the negative supply voltage (actually 200 mv below the negative supply), or from ground for single-supply operation, to within 2.2 v of the positive supply voltage. therefore, at a gain of 3, the amplifiers can provide full rail-to-rail output swing for supply voltages as low as 3.3 v and down to 3 v for a gain of 4. exceeding the headroom limit is not a concern 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 is the headroom limit for signals approaching the positive rail. figure 40 shows a typical offset voltage vs. the input common-mode voltage for the ada4851-1/ada4851-2/ ada4851-4 amplifiers on a 5 v supply. accurate dc performance is maintained from approximately 200 mv below the negative supply to within 2.2 v of the positive supply. for high speed signals, however, there are other considerations. figure 41 shows ?3 db bandwidth vs. input common-mode voltage for a unity-gain follower. as the common-mode voltage approaches 2 v of positive supply, the amplifier responds well but the bandwidth begins to drop as the common-mode voltage approaches the positive supply. this can manifest itself in increased distortion or settling time. higher frequency signals require more headroom than the lower frequencies to maintain distortion performance. 600 580 560 540 520 500 480 460 440 ?6 ?5 ?4 ?3 ?2 ?1 0 1 2 3 4 v os ( v) v cm (v) 05143-046 figure 40. v os vs. common-mode voltage, v s = 5 v ?6 ?5 ?4 ?3 ?2 ?1 0 1 gain (db) 0.1 10 1 100 05143-050 frequency (mhz) 2 1000 g = +1 r l = 1k v s = 5v v cm = 3.0v v cm = 3.1v v cm = 3.2v v cm = 3.3v figure 41. unity-gain follower bandwidth vs. input common-mode
ada4851-1/ada4851-2/ada4851-4 rev. j | page 18 of 24 figure 42 illustrates how the rising edge settling time for the amplifier is configured as a unity-gain follower, stretching out as the top of a 1 v step input that approaches and exceeds the specified input common-mode voltage limit. for signals approaching the negative supply and inverting gain and high positive gain configurations, the headroom limit is the output stage. the ada4851-1/ada4851-2/ada4851-4 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 the drive current that the output transistor is required to supply due to the collector resistance of the output transistor. 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 0 102030405060708090100 output voltage (v) time (ns) 05143-052 3.6 v step = 2v to 3v v step = 2.1v to 3.1v v step = 2.2v to 3.2v v step = 2.3v to 3.3v v step = 2.4v to 3.4v g = +1 r l = 1k v s = 5v figure 42. output rising edge for 1 v step at input headroom limits 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 slightly more headroom than the lower fre- quency signals. figure 16 illustrates this point by plotting the typical harmonic distortion vs. the output amplitude. overload behavior and recovery input the specified input common-mode voltage of the ada4851-1/ ada4851-2/ada4851-4 is 200 mv below the negative supply to within 2.2 v of the positive supply. exceeding the top limit results in lower bandwidth and increased rise time, as shown in figure 41 and figure 42 . pushing the input voltage of a unity- gain follower to less than 2 v from the positive supply leads to the behavior shown in figure 43 an increasing amount of output error as well as a much increased settling time. the recovery time from input voltages of 2.2 v or closer to the positive supply is approximately 55 ns, which is limited by the settling artifacts caused by transistors in the input stage coming out of saturation. the amplifiers 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 increases the current draw of the devices. output voltage (v) time (ns) 05143-051 2.00 2.25 2.50 3.00 3.25 3.50 2.75 0 100 200 300 400 500 600 700 800 900 1k g = +1 r l = 1k v s = 5v v step = 2.25v to 3.25v v step = 2.25v to 3.5v, 4v, and 5v figure 43. pulse response of g = +1 follower, input step overloading the input stage output output overload recovery is typically within 35 ns after the input of the amplifier is brought to a nonoverloading value. figure 44 shows output recovery transients for the amplifier configured in an inverting gain of 1 recovering from a saturated output from the top and bottom supplies to a point at midsupply. ?2 ?1 0 1 2 3 4 5 6 0 102030405060708090100 input and output voltage (v) time (ns) 05143-053 7 g = ?1 r l = 1k v s = 5v input voltage edges v out = 5v to 2.5v v out = 0v to 2.5v figure 44. overload recovery
ada4851-1/ada4851-2/ada4851-4 rev. j | page 19 of 24 single-supply video amplifier an example of an 8 mhz, three-pole, sallen-key, low-pass, video reconstruction filter is shown in figure 46 . this circuit features a gain of 3, has a 0.1 db bandwidth of 8.2 mhz, and over 17 db attenuation at 27 mhz (see figure 47 ). the filter has three poles; two are active with a third passive pole (r6 and c4) placed at the output. c3 improves the filter roll-off. r6, r7, and r8 comprise the video load of 150 . components r6, c4, r7, r8, and the input termination of the network analyzer form a 12.8 db attenuator; therefore, the reference level is roughly ?3.3 db, as shown in figure 47 . the ada4851 family of amplifiers is well suited for portable video applications. when operating in low voltage single-supply applications, the input signal is limited by the input stage headroom. for additional information, see the headroom considerations section. table 6 shows the recommended values for voltage, input signal, various gains, and output signal swing for the typical video amplifier shown in figure 45 . 75 cable v out 75 75 v in v r g r f +v s p d u1 c1 2.2f c2 0.01 f 05143-059 + r2 47? i out r3 125 ? r6 6.8 ? +3v r7 68.1 ? r1 37.4 ? c1 51pf c3 6.8pf c4 1nf r4 2k ? r5 1k ? r8 75? v ou t c2 51pf video dac 05143-061 figure 45. vi deo amplifier table 6. recommended values supply voltage (v) input range (v) r g (k) r f (k) gain (v/v) v (v) figure 46. 8 mhz video recons truction filter schematic v out (v) 05143-062 1: ?3.3931db 8.239626mhz 5db/ref ?15db 0.03 0.1 1 10 100 1 frequency (mhz) 3 0 to 0.8 1 1 2 1.6 0.8 3 0 to 0.8 0.499 1 3 2.4 1.2 5 0 to 2.8 1 1 2 4.9 2.45 video reconstruction filter at higher frequencies, active filters require wider bandwidths to work properly. excessive phase shift introduced by lower frequency op amps can significantly affect the filter performance. a common application for active filters is at the output of video dacs/encoders. the filter, or more appropriately, the video reconstruction filter, is used at the output of a video dac/ encoder to eliminate the multiple images that are created during the sampling process within the dac. for portable video appli- cations, the ada4851 family of amplifiers is an ideal choice due to its lower power requirements and high performance. figure 47. video reconstruction filter frequency performance
ada4851-1/ada4851-2/ada4851-4 rev. j | page 20 of 24 outline dimensions compliant to jedec standards mo-178-ab 121608-a 10 4 0 seating plane 1.90 bsc 0.95 bsc 0.60 bsc 65 123 4 3.00 2.90 2.80 3.00 2.80 2.60 1.70 1.60 1.50 1.30 1.15 0.90 0 .15 max 0 .05 min 1.45 max 0.95 min 0.20 max 0.08 min 0.50 max 0.30 min 0.55 0.45 0.35 pin 1 indicator figure 48. 6-lead small outline transistor package [sot-23] (rj-6) dimensions shown in millimeters 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 49. 8-lead mini small outline package [msop] (rm-8) dimensions shown in millimeters
ada4851-1/ada4851-2/ada4851-4 rev. j | page 21 of 24 compliant to jedec standards mo-153-ab-1 061908-a 8 0 4.50 4.40 4.30 14 8 7 1 6.40 bsc pin 1 5.10 5.00 4.90 0.65 bsc 0.15 0.05 0.30 0.19 1.20 max 1.05 1.00 0.80 0.20 0.09 0.75 0.60 0.45 coplanarity 0.10 seating plane figure 50. 14-lead thin shrink small outline package [tssop] (ru-14) dimensions shown in millimeters rderig gide odel 1 2 temerature rane acae descrition acae tion brandin ada4851-1yrjz-r2 ?40c to +125c 6-lead small o utline transistor package (sot-23) rj-6 hhb ada4851-1yrjz-rl ?40c to +125c 6-lead small o utline transistor package (sot-23) rj-6 hhb ada4851-1yrjz-rl7 ?40c to +125c 6-lead small o utline transistor package (sot-23) rj-6 hhb ada4851-1wyrjz-r7 ?40c to +125c 6-lead small outline transistor package (sot-23) rj-6 h1z ada4851-2yrmz ?40c to +125c 8-lead mini small outline package (msop) rm-8 hsb ada4851-2yrmz-rl ?40c to +125c 8-lead mini small outline package (msop) rm-8 hsb ada4851-2yrmz-rl7 ?40c to +125c 8-lead mini small outline package (msop) rm-8 hsb ada4851-2wyrmz-r7 ?40c to +125c 8-lead mini small outline package (msop) rm-8 h1y ada4851-4yruz C40c to +125c 14-lead thin shrink small outline package (tssop) ru-14 ada4851-4yruz-rl C40c to +125c 14-lead thin shrink small outline package (tssop) ru-14 ada4851-4yruz-rl7 C40c to +125c 14-lead thin shrink small outline package (tssop) ru-14 ada4851-4wyruz-r7 C40c to +125c 14-lead thin shrink small outline package (tssop) ru-14 ada4851-1yrj-ebz 6-lead sot-23 evaluation board ada4851-2yrm-ebz 8-lead msop evaluation board ADA4851-4YRU-EBZ 14-lead tssop evaluation board 1 z = rohs compliant part. 2 w = qualified for auto motive applications. automotive products the ada4851-1w/ada4851-2w/ada4851-4w 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 the specifications section of this data sheet carefully. only the automot ive grade products shown are available for use in automotive applications. contact your local analog devices, inc., account representativ e for specific product ordering information and to obtain the specific automotive reliability reports for these models.
ada4851-1/ada4851-2/ada4851-4 rev. j | page 22 of 24 notes
ada4851-1/ada4851-2/ada4851-4 rev. j | page 23 of 24 notes
ada4851-1/ada4851-2/ada4851-4 rev. j | page 24 of 24 notes ?2004C2010 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d05143-0-10/10(j)

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