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low power, rail-to-rail output, video op amp with ultralow power disable ada4853-1/ada4853-2/ada4853-3 rev. b 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 ?2006 analog devices, inc. all rights reserved. features ultralow power-down current: 0.1 a low quiescent current: 1.4 ma/amplifier ideal for standard definition video high speed 100 mhz, ?3 db bandwidth 120 v/s slew rate 0.5 db flatness: 22 mhz differential gain: 0.20% differential phase: 0.10 single-supply operation rail-to-rail output output swings to within 200 mv of either rail low voltage offset: 1 mv wide supply range: 2.65 v to 5 v applications portable multimedia players video cameras digital still cameras consumer video pin configurations v out 1 +in 3 2 ada4853-1 top view (not to scale) ?v s +v s 6 ?in 4 5 power down 0 5884-001 nc = no connect 1 v out 1 2 ?in1 3 +in1 4 ?v s 11 v out 2 12 +v s 10 ?in2 9 +in2 5 n c 6 n c 7 n c 8 n c 1 5 n c 1 6 n c 1 4 p d 1 1 3 p d 2 ada4853-2 ? + ? + 0 5884-056 figure 1. 6-lead sc70 figure 2. 16-lead lfcsp_vq 1 disable 1 2 disable 2 3 disable 3 4 +v s 11 +in 12 ?v s 10 ?in 9 v out 5 + i n 6 ? i n 7 v o u t 8 ? v s 1 5 v o u t 1 6 + v s 1 4 ? i n 1 3 + i n a da4853-3 +? +? + ? 05884-057 ada4853-3 1 2 3 4 5 6 7 disable 2 disable 3 +v s v out ?in +in disable 1 14 13 12 11 10 9 8 ?in +in ?v s v out ?in +in v out + ? + ? + ? 05884-058 figure 3. 16-lead lfcsp_vq figure 4. 16-lead tssop general description the ada4853-1/ada4853-2/ada4853-3 are low power, low cost, high speed, rail-to-rail output op amps with ultralow power disable that are ideal for portable consumer electronics. despite their low price, the ada4853-1/ada4853-2/ada4853-3 provide excellent overall performance and versatility. the 100 mhz, ?3 db bandwidth and 120 v/s slew rate make these amplifiers well-suited for many general-purpose, high speed applications. the ada4853-1/ada4853-2/ada4853-3 voltage feedback op amps are designed to operate at supply voltages as low as 2.65 v and up to 5 v using only 1.4 ma of supply current per amplifier. to further reduce power consumptio n, the amplifiers are equipped with a power-down mode that lowers the supply current to less than 1.5 a maximum, making them ideal in battery-powered applications. the ada4853-1/ada4853-2/ada4853-3 provide users with a true single-supply capability, allowing input signals to extend 200 mv below the negative rail and to within 1.2 v of the positive rail. on the output, the amplifiers can swing within 200 mv of either supply rail. with their combination of low price, excellent differential gain (0.2%), differential phase (0.10), and 0.5 db flatness out to 22 mhz, these amplifiers are ideal for video applications. the ada4853-1 is available in a 6-lead sc70, the ada 4853-2 is available in a 16-lead lfcsp_vq, and the ada4853-3 is available in both a 16-lead lfcsp_vq and a 14-lead tssop. the ada4853-1 temperature range is ?40c to +85c, while the ada4853-2/ada4853-3 temperature range is ?40c to +105c. 6.5 6.4 6.3 6.2 6.1 6.0 5.9 5.8 5.7 5.6 5.5 0.1 1 10 40 frequency (mhz) closed-loop gain (db) v s =5v r l =150 ? g=+2 0.1v p-p 2.0v p-p 05884-010 figure 5. 0.5 db flatness frequency response
ada4853-1/ada4853-2/ada4853-3 rev. b | page 2 of 16 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 ......................................................................... 14 headroom considerations ........................................................ 14 overload behavior and recovery ............................................ 14 applications ..................................................................................... 15 single-supply video amplifier ................................................. 15 power supply bypassing ............................................................ 15 layout .......................................................................................... 15 outline dimensions ....................................................................... 16 ordering guide .......................................................................... 16 revision history 10/06rev. a to rev. b added ada4853-3.............................................................universal added 16-lead lfcsp_vq ..............................................universal added 14-lead tssop ......................................................universal changes to features.......................................................................... 1 changes to dc performance, input characteristics, and power supply sections ................................................................................. 3 changes to dc performance, input characteristics, and power supply sections ................................................................................. 4 changes to figure 20........................................................................ 8 changes to figure 49...................................................................... 13 updated outline dimensions ....................................................... 16 changes to ordering guide .......................................................... 16 7/06rev. 0 to rev. a added ada4853-2.............................................................universal changes to features and general description ............................. 1 changes to table 1............................................................................ 3 changes to table 2............................................................................ 4 changes to table 3............................................................................ 5 changes to figure 7...........................................................................6 changes to figure 11 caption, figure 12, figure 13, and figure 16......................................................................................7 changes to figure 17 and figure 19................................................8 inserted figure 21; renumbered sequentially ..............................8 inserted figure 25; renumbered sequentially ..............................9 changes to figure 28.........................................................................9 changes to figure 31 through figure 35..................................... 10 changes to figure 37, figure 39 through figure 42 .................. 11 inserted figure 43 and figure 46.................................................. 12 inserted figure 47........................................................................... 13 changes to circuit description section...................................... 13 changes to headroom considerations section ......................... 13 changes to figure 48...................................................................... 14 updated outline dimensions....................................................... 15 changes to ordering guide .......................................................... 15 1/06revision 0: initial version
ada4853-1/ada4853-2/ada4853-3 rev. b | page 3 of 16 specifications specifications with 3 v supply t a = 25c, r f = 1 k, r g = 1 k for g = +2, r l = 150 , unless otherwise noted. table 1. parameter conditions min typ max unit dynamic performance ?3 db bandwidth g = +1, v o = 0.1 v p-p 90 mhz g = +2, v o = 2 v p-p 32 mhz bandwidth for 0.5 db flatness g = +2, v o = 2 v p-p, r l = 150 22 mhz settling time to 0.1% v o = 2 v step 45 ns slew rate g = +2, v o = 2 v step 88 100 v/s noise/distortion performance differential gain r l = 150 0.20 % differential phase r l = 150 0.10 degrees input voltage noise f = 100 khz 22 nv/hz input current noise f = 100 khz 2.2 pa/hz crosstalk g = +2, v o = 2 v p-p, r l = 150 , f = 5 mhz ?66 db dc performance input offset voltage 1 4 mv input offset voltage drift 1.6 v/c input bias current 1.0 1.7 a input bias current drift 4 na/c input bias offset current 50 na open-loop gain v o = 0.5 v to 2.5 v 72 80 db input characteristics input resistance differential/common mode 0.5/20 m input capacitance 0.6 pf input common-mode voltage range ?0.2 to +v cc ? 1.2 v input overdrive recovery time (rise/fall) v in = ?0.5 v to +3.5 v, g = +1 40 ns common-mode rejection ratio v cm = 0 v to 1 v ?69 ?85 db power-down power-down input voltage power-down 1.2 v turn-off time 1.4 s turn-on time 120 ns power-down bias current enabled power-down = 3.0 v 25 30 a power-down power-down = 0 v 0.01 a output characteristics output overdrive recovery time v in = ?0.25 v to +1.75 v, g = +2 70 ns output voltage swing r l = 150 0.3 to 2.7 0.15 to 2.88 v short-circuit current sinking/sourcing 150/120 ma power supply operating range 2.65 5 v quiescent current 1.3 1.6 ma/amplifier quiescent current (power-down) power-down = low 0.1 1.5 a positive power supply rejection +v s = +1.5 v to +2.5 v, ?v s = ?1.5 v ?76 ?86 db negative power supply rejection ?v s = ?1.5 v to ?2.5 v, +v s = +1.5 v ?77 ?88 db
ada4853-1/ada4853-2/ada4853-3 rev. b | page 4 of 16 specifications with 5 v supply t a = 25c, r f = 1 k, r g = 1 k for g = +2, r l = 150 , unless otherwise noted. table 2. parameter conditions min typ max unit dynamic performance ?3 db bandwidth g = +1, v o = 0.1 v p-p 100 mhz g = +2, v o = 2 v p-p 35 mhz bandwidth for 0.5 db flatness g = +2, v o = 2 v p-p 22 mhz settling time to 0.1% v o = 2 v step 54 ns slew rate g = +2, v o = 2 v step 93 120 v/s noise/distortion performance differential gain r l = 150 0.22 % differential phase r l = 150 0.10 degrees input voltage noise f = 100 khz 22 nv/hz input current noise f = 100 khz 2.2 pa/hz crosstalk g = +2, v o = 2 v p-p, r l = 150 , f = 5 mhz ?66 db dc performance input offset voltage 1 4.1 mv input offset voltage drift 1.6 v/c input bias current 1.0 1.7 a input bias current drift 4 na/c input bias offset current 60 na open-loop gain v o = 0.5 v to 4.5 v 72 80 db input characteristics input resistance differential/common mode 0.5/20 m input capacitance 0.6 pf input common-mode voltage range ?0.2 to +v cc ? 1.2 v input overdrive recovery time (rise/fall) v in = ?0.5 v to +5.5 v, g = +1 40 ns common-mode rejection ratio v cm = 0 v to 3 v ?71 ?88 db power-down power-down input voltage power-down 1.2 v turn-off time 1.5 s turn-on time 120 ns power-down bias current enabled power-down = 5 v 40 50 a power-down power-down = 0 v 0.01 a output characteristics output overdrive recovery time v in = ?0.25 v to +2.75 v, g = +2 55 ns output voltage swing r l = 75 0.55 to 4.5 0.1 to 4.8 v short-circuit current sinking/sourcing 160/120 ma power supply operating range 2.65 5 v quiescent current 1.4 1.8 ma/amplifier quiescent current (power-down) power-down = low 0.1 1.5 a positive power supply rejection +v s = +2.5 v to +3.5 v, ?v s = ?2.5 v ?75 ?80 db negative power supply rejection ?v s = ?2.5 v to ?3.5 v, +v s = +2.5 v ?75 ?80 db
ada4853-1/ada4853-2/ada4853-3 rev. b | page 5 of 16 absolute maximum ratings table 3. parameter rating supply voltage 5.5 v power dissipation see figure 6 common-mode input voltage ?v s ? 0.2 v to +v s ? 1.2 v differential input voltage v s storage temperature range ?65c to +125c operating temperature range 6-lead sc70 ?40c to +85c 16-lead lfcsp_vq ?40c to +105c 14-lead tssop ?40c to +105c lead temperature jedec j-std-20 junction temperature 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, ja is specified for the device soldered in the circuit board for surface- mount packages. table 4. package type ja unit 6-lead sc70 430 c/w 16-lead lfcsp_vq 63 c/w 14-lead tssop 120 c/w maximum power dissipation the maximum safe power dissipation for the ada4853-1/ ada4853-2/ada4853-3 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 properties. even temporarily exceeding this temperature limit can 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. the power dissipated in the package (p d ) for a sine wave and a resistor load is the total power consumed from the supply minus the load power. p d = total power consumed ? load power ( ) l out current supply voltage supply d r v i vp 2 C = rms output voltages should be considered. 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 6 shows the maximum safe power dissipation in the package vs. the ambient temperature for the 6-lead sc70 (430c/w), the 14-lead tssop (120c/w), and the 16-lead lfcsp_vq (63c/w) on a jedec standard 4-layer board. ja values are approximations. 3.0 0 125105856545 25 5 ?15?35?55 ambient temperature (c) maximum power dissipation (w) 2.5 2.0 1.5 1.0 0.5 sc70 tssop lfcsp 05884-059 figure 6. maximum power dissipation vs. temperature for a 4-layer board esd caution
ada4853-1/ada4853-2/ada4853-3 rev. b | page 6 of 16 typical performance characteristics 2 ?6 0.1 200 frequency (mhz) normalized closed-loop gain (db) 1 10 100 1 0 ?1 ?2 ?3 ?4 ?5 g = ?1* g = +2* g = +10* v s = 5v r l = 150 ? v out = 0.1v p-p 0 5884-006 *ada4853-1/ada4853-2 ada4853-3 lfcsp figure 7. small signal frequency response for various gains v s = 5v g = +1 v out = 0.1v p-p r l = 75 ? frequency (mhz) closed-loop gain (db) 3 2 0 1 ?1 ?2 ?3 ?4 ?5 ?6 0.1 1 10 100 200 r l = 150 ? r l = 1k ? 0 5884-007 figure 8. small signal frequency response for various loads frequency (mhz) closed-loop gain (db) 4 3 2 1 ?1 0 ?4 ?5 ?3 ?2 ?6 0.1 1 10 100 200 g = +1 r l = 150 ? v out = 0.1v p-p v s = 3v v s = 5v 05884-008 figure 9. small signal frequency response for various supplies r l c l r snub 5 3 4 0 ?3 ?4 ?5 ?2 ?1 1 2 ?6 0.1 1 10 100 200 frequency (mhz) closed-loop gain (db) v s = 5v r l = 150 ? v out = 0.1v p-p g = +1 c l = 0pf c l = 5pf c l = 10pf 05884-009 c l = 10pf/25 ? snub figure 10. small signal frequency response for various capacitive loads 6.5 6.4 6.3 6.2 6.1 6.0 5.9 5.8 5.7 5.6 5.5 0.1 1 10 40 frequency (mhz) closed-loop gain (db) v s =5v r l =150 ? g=+2 0.1v p-p 2.0v p-p 05884-010 figure 11. 0.5 db flatness response for various output voltages 8.0 0.1 1000 frequency (mhz) closed-loop gain (db) 11 01 0 0 7.8 7.6 7.4 7.2 7.0 6.8 6.6 6.4 6.2 6.0 5.8 5.6 0.1v p-p 2v p-p v s = 5v r l = 150 ? g = +2 05884-060 figure 12. ada4853-3 lfcsp_vq flatness response for various output voltages
ada4853-1/ada4853-2/ada4853-3 rev. b | page 7 of 16 frequency (mhz) 1 0 ?1 ?2 ?3 ?4 ?5 ?6 normalized closed-loop gain (db) 0.1 1 10 100 200 v s = 5v r l = 150 ? v out = 2v p-p g=?1 g=+2 g=+10 05884-011 figure 13. large signal frequency response for various gains closed-loop gain (db) 7 6 5 4 3 2 1 0 frequency (mhz) 0.1 200 11 01 0 0 v s =5v v out =2vp-p g=+2 r l =1k ? r l =75 ? r l =150 ? 0 5884-012 figure 14. large signal frequency response for various loads closed-loop gain (db) 5 3 4 2 1 0 ?1 ?2 ?3 ?4 ?5 ?6 frequency (mhz) 0.1 1 10 100 200 v s = 3v r l = 150 ? v out = 0.1v p-p g = +1 +25c +85c ?40c 05884-013 figure 15. small signal frequency response for various temperatures frequency (mhz) 4 3 2 0 1 ?1 ?2 ?4 ?3 ?6 ?5 0.1 1 10 100 200 v s = 5v r l = 150 ? v out = 0.1v p-p g = +1 closed-loop gain (db) +25c +85c ?40c 05884-014 figure 16. small signal frequency response for various temperatures 250 200 100 150 50 0 0 0.5 1.5 2.5 3.5 1.0 2.0 3.0 4.0 output voltage step (v) slew rate ( v /s) negative slew rate positive slew rate v s =5v r l = 150 ? g=+2 0 5884-015 figure 17. slew rate vs. output voltage 140 ?20 100 frequency (hz) open-loop gain (db) open-loop phase (degrees) 1k 10k 100k 1m 10m 100m 120 100 80 60 40 20 0 ?240 ?210 ?180 ?150 ?120 ?90 ?60 ?30 0 gain phase 0 5884-029 v s =5v r l = 150 ? figure 18. open-loop gain and phase vs. frequency
ada4853-1/ada4853-2/ada4853-3 rev. b | page 8 of 16 ? 20 ?90 ?80 ?70 ?60 ?50 ?40 ?30 100 1k 10k 100k 1m 10m 100m common-mode rejection (db) frequency (hz) 05884-030 v s = 5v figure 19. common-mode rejection vs. frequency 0 ?100 100 1k 10k 100k 1m 10m 100m power supply rejection (db) frequency (hz) ?10 ?20 ?30 ?40 ?50 ?60 ?70 ?80 ?90 +psr ?psr v s = 5v gain = +2 rto 05884-031 - figure 20. power supply rejection vs. frequency 1000 0.01 0.1 1 10 100 100 1k 10k 100k 1m 10m 100m closed-loop output impedance ( ? ) frequency (hz) 05884-032 v s = 5v g = +1 figure 21. output impedance vs. frequency enabled 10m 100 1k 10k 100k 1m 10m 100m frequency (hz) closed-loop output impedance ( ? ) 10 100 1k 10k 100k 1m v s = 5v g = +1 ada4853-3 ada4853-1/ ada4853-2 05884-050 figure 22. output impedanc e vs. frequency disabled frequency (mhz) ? 40 ?50 ?70 ?60 ?80 ?90 ?100 ?110 0.1 1 10 g = +2 v s = 3v v out = 2v p-p r l = 1k ? hd3 r l = 1k ? hd2 r l = 150 ? hd3 r l = 150 ? hd2 ha r monic distortion (dbc) 05884-016 figure 23. harmonic distortion vs. frequency g = +2 v s = 5v v out = 2v p-p r l = 1k ? hd3 r l = 1k ? hd2 r l = 150 ? hd2 r l = 150 ? hd3 ? 40 ?50 ?70 ?60 ?80 ?90 ?100 ?120 ?110 0.1 1 10 frequency (mhz) ha r monic distortion (dbc) 05884-017 figure 24. harmonic distortion vs. frequency
ada4853-1/ada4853-2/ada4853-3 rev. b | page 9 of 16 g = +1 v s = 5v v out = 2v p-p r l = 75 ? hd3 r l = 75 ? hd2 r l = 150 ? hd2 r l = 150 ? hd3 r l = 1k ? hd3 r l = 1k ? hd2 ? 40 ?50 ?70 ?60 ?80 ?90 ?100 ?120 ?110 0.1 1 10 frequency (mhz) ha r monic distortion (dbc) 0 5884-018 figure 25. harmonic distortion vs. frequency ? 30 ?100 0.1 10 frequency (mhz) harmonic distortion (dbc) 1 ?40 ?50 ?60 ?70 ?80 ?90 g=+2 v out =2vp-p r l =75 ? v s = 3v hd3 v s =5vhd2 v s =5vhd3 v s =3vhd2 05884-051 figure 26. harmonic distortion vs. frequency 0123 hd2 hd3 4 v out (v p-p) ? 40 ?50 ?70 ?60 ?80 ?90 ?100 ?120 ?110 ha r monic distortion (dbc) 05884-019 2v 5v gnd g = +1 v s = 5v r l = 150 ? f = 100khz figure 27. harmonic distortion for various output voltages output voltage (v) 05884-033 g = +2 r l = 150 ? 25ns/div v s = 3v v s = 5v 2.60 2.40 2.42 2.44 2.46 2.48 2.50 2.52 2.54 2.56 2.58 figure 28. small signal pulse response for various supplies 2.60 2.40 2.42 2.44 2.46 2.48 2.50 2.52 2.54 2.56 2.58 output voltage (v) g=+1;c l =5pf g=+2;c l =0pf,5pf,10pf v s =5v r l =150 ? 25ns/div 05884-034 figure 29. small signal pulse response for various capacitive loads output voltage (v) 05884-035 g = +2 r l = 150 ? 25ns/div v s = 3v, 5v 3.75 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50 figure 30. large signal pulse response for various supplies
ada4853-1/ada4853-2/ada4853-3 rev. b | page 10 of 16 3.75 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50 output voltage (v) 05884-036 g = +2 v s = 5v r l = 150 ? 25ns/div c l = 0pf, 20pf figure 31. large signal pulse response for various capacitive loads 100ns/div 5.5 4.5 3.5 2.5 1.5 0.5 ?0.5 input and output voltage (v) output 2input v s =5v g=+2 r l =150 ? f=1mhz 05884-020 figure 32. output overdrive recovery 100ns/div 5.5 4.5 3.5 2.5 1.5 0.5 ?0.5 input and output voltage (v) v s =5v g=+1 r l =150 ? f=1mhz input output 05884-021 figure 33. input overdrive recovery 10 100 1k 10k 100k 1m 10m voltage noise (nv/ hz) frequency (hz) 1000 10 100 05884-037 figure 34. voltage noise vs. frequency 100 1 10 10 100 1k 10k 100k 1m 10m current noise (pa/ hz) frequency (hz) 05884-038 figure 35. current noise vs. frequency 20 18 16 14 12 10 8 6 4 2 0 ?4 4 321 ?1 ?3 0 ?2 count v offset (mv) 05884-042 v s = 5v n = 155 x = ?0.370mv = 0.782 figure 36. v os distribution
ada4853-1/ada4853-2/ada4853-3 rev. b | page 11 of 16 ? 0.6 ?0.8 ?1.0 ?1.2 ?1.4 ?1.6 ?1.8 ?2.0 ?1.0 ?0.5 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 v cm (v) v os (mv) 0 5884-022 v s = 5v figure 37. v os vs. common-mode voltage 1.5 1.0 0.5 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 power down voltage (v) supply current (ma) v s =5v,t=+85c v s = 5v, t = +25c v s = 5v, t = ?40c v s = 3v, t = ?40c v s = 3v, t = +25c v s =3v,t=+85c 05884-023 figure 38. supply current vs. power down voltage ? 0.6 ?0.7 ?0.8 ?0.9 ?1.0 ?50 ?25 0 25 50 75 100 temperature (c) input offset voltage (mv) v s = 5v v s = 3v 05884-026 figure 39. input offset voltage vs. temperature ? 0.50 ?0.68 ?40 ?20 0 20 40 60 80 temperature (c) input bias current (a) ?0.52 ?0.54 ?0.56 ?0.58 ?0.60 ?0.62 ?0.64 ?0.66 v s =5v v s =3v +i b ?i b 05884-027 figure 40. input bias current vs. temperature 3.0 2.8 2.6 2.4 0.6 0.4 0.2 0 1 output voltage (v) load resistance ( ? ) 10 100 1k 10k negative swing v s =3v positive swing load resistance tied to midsupply 05884-039 figure 41. output voltage vs. load resistance 5.0 4.8 4.6 4.4 0.6 0.4 0.2 0 10 100 10k 1k output voltage (v) load resistance ( ? ) positive swing v s =5v negative swing load resistance tied to midsupply 05884-040 figure 42. output voltage vs. load resistance
ada4853-1/ada4853-2/ada4853-3 rev. b | page 12 of 16 output voltage (v) 3.0 2.9 2.8 2.7 2.6 2.5 0.5 0.4 0.3 0.2 0.1 0 v s =3v 05 0 +0.001 (+0.1%) ?0.001 (?0.1%) 0 102030405060708090100110120130140150 time (ns) voltage (v) 1.9 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0 3.1 v output v s =5v r l =150 ? load current (ma) 5 1015202530354045 05884-041 negative swing positive swing 2v input 2v input ? v output 2v input ? v output (v) 05884-045 figure 43. output voltage vs. load current output voltage (v) 5.0 4.9 4.8 4.7 4.6 4.5 0.5 0.4 0.3 0.2 0.1 0 v s =5v 05 0 load current (ma) 5 1015202530354045 05884-052 negative swing positive swing figure 44. output voltage vs. load current 0.25 0 temperature (c) output saturation voltage (v) 0.20 0.15 0.10 0.05 ?40 ?20 0 20 40 60 80 r l =150 ? v s =3v ?v sat +v sat v s =5v 05884-053 figure 45. output saturation voltag e vs. temperature for various supplies figure 46. 0.1% settling time 6 5 4 2 3 1 0 3 2 1 0 ?1 012345678910 power down pin voltage (v) output voltage (v) time (s) power down g = +2 v s = 5v f in = 100khz v out ada4853-1/ ada4853-2 v out ada4853-3 05884-046 figure 47. enable/disable time ? 40 ?100 100k 200m frequency (hz) crosstalk (db) 1m 10m 100m ?50 ?60 ?70 ?80 ?90 v s = 5v g = +2 r l = 150 ? v out = 2v p-p v out 1 to v out 2 ada4853-2 v out 2 to v out 1 ada4853-2 ada4853-3 all hostile 0 5884-054 figure 48. crosstalk vs. frequency
ada4853-1/ada4853-2/ada4853-3 rev. b | page 13 of 16 0 ?100 0.1 200 frequency (mhz) input-to-output isolation (db) 1 10 100 ?20 ?40 ?60 ?80 v s = 5v r l = 150 ? v in = 1v p-p g = +2 05884-055 figure 49. input-to-output isolation, chip disabled
ada4853-1/ada4853-2/ada4853-3 rev. b | page 14 of 16 circuit description the ada4853-1/ada4853-2/ada4853-3 feature a high slew rate input stage that is a true single-supply topology capable of sensing signals at or below the minus supply rail. the rail-to- rail output stage can pull within 100 mv of either supply rail when driving light loads and within 200 mv when driving 150 . high speed performance is maintained at supply voltages as low as 2.65 v. headroom considerations the ada4853-1/ada4853-2/ada4853-3 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 their headroom limits. the amplifiers input common-mode voltage range extends from the negative supply voltage (actually 200 mv below this) to within 1.2 v of the positive supply voltage. exceeding the headroom limits is not a concern for any inverting gain on any supply voltage, as long as the reference voltage at the amplifiers positive input lies within the amplifiers input common-mode range. the input stage is the headroom limit for signals approaching the positive rail. figure 50 shows a typical offset voltage vs. the input common-mode voltage for the ada4853-1/ada4853-2/ ada4853-3 on a 5 v supply. accurate dc performance is maintained from approximately 200 mv below the negative supply to within 1.2 v of the positive supply. for high speed signals, however, there are other considerations. as the common-mode voltage gets within 1.2 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. ? 0.6 ?0.8 ?1.0 ?1.2 ?1.4 ?1.6 ?1.8 ?2.0 ?1.0 ?0.5 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 v cm (v) v os (mv) 0 5884-022 v s = 5v figure 50. v os vs. common-mode voltage, v s = 5 v for signals approaching the negative supply and inverting gain and high positive gain configurations, the headroom limit is the output stage. the ada4853-1/ada4853-2/ada4853-3 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 output transistors 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 lower frequency signals. figure 27 illustrates this point by plotting the typical distortion vs. the output amplitude. overload behavior and recovery input the specified input common-mode voltage of the ada4853-1/ ada4853-2/ada4853-3 is 200 mv below the negative supply to within 1.2 v of the positive supply. exceeding the top limit results in lower bandwidth and increased rise time. pushing the input voltage of a unity-gain follower to less than 1.2 v from the positive supply leads to an increasing amount of output error as well as increased settling time. the recovery time from input voltages 1.2 v or closer to the positive supply is approximately 40 ns; this 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, greatly increasing the current draw of the devices.
ada4853-1/ada4853-2/ada4853-3 rev. b | page 15 of 16 applications single-supply video amplifier with low differential gain and phase errors and wide 0.5 db flatness, the ada4853-1/ada4853-2/ada4853-3 are ideal solutions for portable video applications. figure 51 shows a typical video driver set for a noninverting gain of +2, where r f = r g = 1 k. the video amplifier input is terminated into a shunt 75 resistor. at the output, the amplifier has a series 75 resistor for impedance matching to the video load. when operating in low voltage, single-supply applications, the input signal is only limited by the input stage headroom. 75? cable v out 75? 75 ? v in r g r f +v s p d u1 c1 2.2f c2 0.01f 0 5884-043 + v figure 51. vi deo amplifier power supply bypassing attention must be paid to bypassing the power supply pins of the ada4853-1/ada4853-2/ada4853-3. high quality capacitors with low equivalent series resistance (esr), such as multilayer ceramic capacitors (mlccs), should be used to minimize supply voltage ripple and power dissipation. a large, usually tantalum, 2.2 f to 47 f capacitor located in proximity to the ada4853-1/ada4853-2/ada4853-3 is required to provide good decoupling for lower frequency signals. the actual value is determined by the circuit transient and frequency requirements. in addition, 0.1 f mlcc decoupling capacitors should be located as close to each of the power supply pins as is physically possible, no more than ? inch away. the ground returns should terminate immediately into the ground plane. locating the bypass capacitor return close to the load return minimizes ground loops and improves performance. layout as is the case with all high speed applications, careful attention to printed circuit board (pcb) layout details prevents associated board parasitics from becoming problematic. the ada4853-1/ ada4853-2/ada4853-3 can operate up to 100 mhz; therefore, proper rf design techniques must be employed. the pcb should have a ground plane covering all unused portions of the component side of the board to provide a low impedance return path. removing the ground plane on all layers from the area near and under the input and output pins reduces stray capacitance. signal lines connecting the feedback and gain resistors should be kept as short as possible to minimize the inductance and stray capacitance associated with these traces. termination resistors and loads should be located as close as possible to their respective inputs and outputs. input and output traces should be kept as far apart as possible to minimize coupling (crosstalk) through the board. adherence to microstrip or stripline design techniques for long signal traces (greater than 1 inch) is recommended. for more information on high speed board layout, go to: www.analog.com to view a practical guide to high-speed printed-circuit-board layout .
ada4853-1/ada4853-2/ada4853-3 rev. b | page 16 of 16 outline dimensions compliant to jedec standards mo-203-ab 0.22 0.08 0.30 0.15 1.00 0.90 0.70 seating plane 4 5 6 3 2 1 pin 1 0.65 bsc 1.30 bsc 0.10 max 0.10 coplanarity 0.40 0.10 1.10 0.80 2.20 2.00 1.80 2.40 2.10 1.80 1.35 1.25 1.15 0.46 0.36 0.26 figure 52. 6-lead thin shrink small outline transistor package [sc70] (ks-6)dimensions shown in millimeters 4.50 4.40 4.30 14 8 7 1 6.40 bsc pin 1 5.10 5.00 4.90 0.65 bsc seating plane 0.15 0.05 0.30 0.19 1.20 max 1.05 1.00 0.80 0.20 0.09 8 0 0.75 0.60 0.45 coplanarity 0.10 compliant to jedec standards mo-153-ab-1 figure 53. 14-lead thin shrink small outline package [tssop] (ru-14)dimensions shown in millimeters 1 0.50 bsc 0.60 max p i n 1 i n d i c a t o r 1.50 ref 0.50 0.40 0.30 0.25 min 0.45 2.75 bsc sq top view 12 max 0.80 max 0.65 typ seating plane pin 1 indicato r 0.90 0.85 0.80 0.30 0.23 0.18 0.05 max 0.02 nom 0.20 ref 3.00 bsc sq * 1.65 1.50 sq 1.35 16 5 13 8 9 12 4 exposed pad (bottom view) * compliant to jedec standards mo-220-veed-2 except for exposed pad dimension. figure 54. 16-lead lead frame chip scale package [lfcsp_vq] 3 mm 3 mm body, very thin quad (cp-16-3)dimensions shown in millimeters ordering guide model temperature range package description ordering quantity package option branding ada4853-1aksz-r2 1 C40c to +85c 6-lead thin shrink small outline transistor package (sc70) 250 ks-6 hec ada4853-1aksz-r7 1 C40c to +85c 6-lead thin shrink small outline transistor package (sc70) 3,000 ks-6 hec ada4853-1aksz-rl 1 C40c to +85c 6-lead thin shrink small outline transistor package (sc70) 10,000 ks-6 hec ada4853-2ycpz-r2 1 C40c to +105c 16-lead lead frame chip scale package (lfcsp_vq) 250 cp-16-3 h0h ada4853-2ycpz-rl 1 C40c to +105c 16-lead lead frame chip scale package (lfcsp_vq) 5,000 cp-16-3 h0h ADA4853-2YCPZ-RL7 1 C40c to +105c 16-lead lead frame chip scale package (lfcsp_vq) 1,500 cp-16-3 h0h ada4853-3ycpz-r2 1 C40c to +105c 16-lead lead frame chip scale package (lfcsp_vq) 250 cp-16-3 h0l ada4853-3ycpz-rl 1 C40c to +105c 16-lead lead frame chip scale package (lfcsp_vq) 5,000 cp-16-3 h0l ada4853-3ycpz-r7 1 C40c to +105c 16-lead lead frame chip scale package (lfcsp_vq) 1,500 cp-16-3 h0l ada4853-3yruz 1 C40c to +105c 14-lead think shrink small outline package (tssop) 96 ru-14 ada4853-3yruz-rl 1 C40c to +105c 14-lead think shrink small outline package (tssop) 2,500 ru-14 ada4853-3yruz-r7 1 C40c to +105c 14-lead think shrink small outline package (tssop) 1,000 ru-14 1 z = pb-free part. ?2006 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d05884-0-10/06(b)

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