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high speed, low cost, op amp ada4860-1 rev. 0 information furnished by analog devices is believed to be accurate and reliable. however, no responsibility is assumed by analog devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. specifications subject to change without notice. no license is granted by implication or otherwise under any patent or patent rights of analog devices. trademarks and registered trademarks are the property of their respective owners. one technology way, p.o. box 9106, norwood, ma 02062-9106, u.s.a. tel: 781.329.4700 www.analog.com fax: 781.461.3113 ?2006 analog devices, inc. all rights reserved. features high speed 800 mhz, ?3 db bandwidth 790 v/s slew rate 8 ns settling time to 0.5% wide supply range: 5 v to 12 v low power: 6 ma 0.1 db flatness: 125 mhz differential gain: 0.02% differential phase: 0.02 low voltage offset: 3.5 mv (typ) high output current: 25 ma power down applications consumer video professional video broadband video adc buffers active filters pin configuration v out 1 ?v s 2 +in 3 5 power down 6 +v s 4 ?in +? 0 5709-001 figure 1. 6-lead sot-23 (rj-6) general description the ada4860-1 is a low cost, high speed, current feedback op amp that provides excellent overall performance. the 800 mhz, ?3 db bandwidth, and 790 v/s slew rate make this amplifier well suited for many high speed applications. with its combination of low price, excellent differential gain (0.02%), differential phase (0.02), and 0.1 db flatness out to 125 mhz, this amplifier is ideal for both consumer and professional video applications. the ada4860-1 is designed to operate on supply voltages as low as +5 v and up to 5 v using only 6 ma of supply current. to further reduce power consumption, the amplifier is equipped with a power-down feature that lowers the supply current to 0.25 ma. the ada4860-1 is available in a 6-lead sot-23 package and is designed to work over the extended temperature range of ?40c to +105c. 6.3 6.2 6.1 6.0 5.9 5.8 5.7 5.6 5.5 5.4 5.3 0.1 1 10 100 1000 closed-loop gain (db) frequency (mhz) 05709-003 g = +2 v out = 2v p-p r f = r g = 499 ? v s = +5v v s = 5v figure 2. 0.1 db flatness
ada4860-1 rev. 0 | page 2 of 20 table of contents features .............................................................................................. 1 applications....................................................................................... 1 pin configuration............................................................................. 1 general description ......................................................................... 1 revision history ............................................................................... 2 specifications..................................................................................... 3 absolute maximum ratings............................................................ 5 thermal resistance ...................................................................... 5 esd caution.................................................................................. 5 typical performance characteristics ............................................. 6 application information................................................................ 14 power supply bypassing ............................................................ 14 feedback resistor selection...................................................... 14 driving capacitive loads.......................................................... 15 power down pin......................................................................... 15 video amplifier.......................................................................... 15 single-supply operation ........................................................... 15 optimizing flatness and bandwidth ....................................... 16 layout and circuit board parasitics ........................................ 17 outline dimensions ....................................................................... 18 ordering guide .......................................................................... 18 revision history 4/06revision 0: initial version
ada4860-1 rev. 0 | page 3 of 20 specifications v s = +5 v (@ t a = 25c, g = +2, r l = 150 referred to midsupply, c l = 4 pf, unless otherwise noted). for g = +2, r f = r g = 499 and for g = +1, r f = 550 . table 1. parameter conditions min typ max unit dynamic performance C3 db bandwidth v o = 0.2 v p-p 460 mhz v o = 2 v p-p 165 mhz v o = 0.2 v p-p, r l = 75 430 mhz g = +1, v o = 0.2 v p-p 650 mhz bandwidth for 0.1 db flatness v o = 2 v p-p 58 mhz v o = 2 v p-p, r l = 75 45 mhz +slew rate (rising edge) v o = 2 v p-p 695 v/s ?slew rate (falling edge) v o = 2 v p-p 560 v/s settling time to 0.5% v o = 2 v step 8 ns noise/distortion performance harmonic distortion hd2/hd3 f c = 1 mhz, v o = 2 v p-p ?90/?102 dbc f c = 5 mhz, v o = 2 v p-p ?70/?76 dbc input voltage noise f = 100 khz 4.0 nv/hz input current noise f = 100 khz, +in/?in 1.5/7.7 pa/hz differential gain r l = 150 0.02 % differential phase r l = 150 0.03 degrees dc performance input offset voltage ?13 ?4.25 +13 mv +input bias current ?2 ?1 +1 a ?input bias current ?7 +1.0 +10 a open-loop transresistance 400 650 k input characteristics input resistance +in 10 m ?in 85 input capacitance +in 1.5 pf input common-mode voltage range 1.2 to 3.7 v common-mode rejection ratio v cm = 2 v to 3 v ?52 ?56 db power down pin input voltage enabled 0.5 v power down 1.8 v bias current enabled ?200 na power down 60 a turn-on time 200 ns turn-off time 3.5 s output characteristics output overdrive recovery time (rise/fall) v in = +2.25 v to ?0.25 v 60/100 ns output voltage swing r l = 75 1.2 to 3.8 v r l = 150 1.2 to 3.8 1 to 4 v r l = 1 k 0.9 to 4.1 0.8 to 4.2 v short-circuit current sinking and sourcing 45 ma power supply operating range 5 12 v total quiescent current enabled 4.5 5.2 6.5 ma quiescent current power down pin = +v s 0.2 0.5 ma power supply rejection ratio +psr +v s = 4 v to 6 v, ?v s = 0 v ?60 ?62 db
ada4860-1 rev. 0 | page 4 of 20 v s = 5 v (@ t a = 25c, g = +2, r l = 150 , c l = 4 pf, unless otherwise noted). for g = +2, r f = r g = 499 and for g = +1, r f = 550 . table 2. parameter conditions min typ max unit dynamic performance C3 db bandwidth v o = 0.2 v p-p 520 mhz v o = 2 v p-p 230 mhz v o = 0.2 v p-p, r l = 75 480 mhz g = +1, v o = 0.2 v p-p 800 mhz bandwidth for 0.1 db flatness v o = 2 v p-p 125 mhz v o = 2 v p-p, r l = 75 70 mhz +slew rate (rising edge) v o = 2 v p-p 980 v/s ?slew rate (falling edge) v o = 2 v p-p 790 v/s settling time to 0.5% v o = 2 v step 8 ns noise/distortion performance harmonic distortion hd2/hd3 f c = 1 mhz, v o = 2 v p-p ?90/?102 dbc f c = 5 mhz, v o = 2 v p-p ?77/?94 dbc input voltage noise f = 100 khz 4.0 nv/hz input current noise f = 100 khz, +in/?in 1.5/7.7 pa/hz differential gain r l = 150 0.02 % differential phase r l = 150 0.02 degrees dc performance input offset voltage ?13 ?3.5 +13 mv +input bias current ?2 ?1.0 +1 a ?input bias current ?7 +1.5 +10 a open-loop transresistance 400 700 k input characteristics input resistance +in 12 m ?in 90 input capacitance +in 1.5 pf input common-mode voltage range ?3.8 to +3.7 v common-mode rejection ratio v cm = 2 v ?55 ?58 db power down pin input voltage enabled ?4.4 v power down ?3.2 v bias current enabled ?250 na power down 130 a turn-on time 200 ns turn-off time 3.5 s output characteristics output overdrive recovery time (rise/fall) v in = 3.0 v 45/90 ns output voltage swing r l = 75 2 v r l = 150 2.5 3.1 v r l = 1 k 3.9 4.1 v short-circuit current sinking and sourcing 85 ma power supply operating range 5 12 v total quiescent current enabled 5 6 8 ma quiescent current power down pin = +v s 0.25 0.5 ma power supply rejection ratio +psr +v s = +4 v to +6 v, ?v s = ?5 v ?62 ?64 db ?psr +v s = +5 v, ?v s = ?4 v to ?6 v, power down pin = ?v s ?58 ?61 db
ada4860-1 rev. 0 | page 5 of 20 absolute maximum ratings table 3. parameter rating supply voltage 12.6 v power dissipation see figure 3 common-mode input voltage ?v s + 1 v to +v s ? 1 v differential input voltage v s storage temperature range ?65c to +125c operating temperature range ?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 device soldered in circuit board for surface-mount packages. table 4. thermal resistance package type ja unit 6-lead sot-23 170 c/w maximum power dissipation the maximum safe power dissipation for the ada4860-1 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 across the ada4860-1 helps remove heat from the package, effectively reducing ja . in addition, more metal directly in contact with the package leads and through holes under the device reduces ja . figure 3 shows the maximum safe power dissipation in the package vs. the ambient temperature for the 6-lead sot-23 (170c/w) on a jedec standard 4-layer board. ja values are approximations. 2.0 1.5 1.0 0.5 0 ?40 ?30 ?20 ?10 0 1101009080706050 40302010 maximum power dissipation (w) ambient temperature (c) 05709-002 figure 3. maximum power dissipation vs. temperature for a 4-layer board esd caution esd (electrostatic discharge) sensitive device. electros tatic charges as high as 4000 v readily accumulate on the human body and test equipment and can discharge wi thout detection. although this product features proprietary esd protection circuitry, permanent dama ge may occur on devices subjected to high energy electrostatic discharges. therefore, proper esd pr ecautions are recommended to avoid performance degradation or loss of functionality.
ada4860-1 rev. 0 | page 6 of 20 typical performance characteristics r l = 150 and c l = 4 pf, unless otherwise noted. 2 ?6 ?5 ?4 ?3 ?2 ?1 0 1 0.1 1 10 100 1000 normalized gain (db) frequency (mhz) 05709-008 v s = 5v v out = 0.2v p-p g = +1, r f = 550 ? g = +2, r f = r g = 499 ? g = ?1, r f = r g = 499 ? g = +5, r f = 348 ? , r g = 86.6 ? g = +10, r f = 348 ? , r g = 38.3 ? figure 4. small signal frequency response for various gains 2 ?6 ?5 ?4 ?3 ?2 ?1 0 1 0.1 1 10 100 1000 normalized gain (db) frequency (mhz) 05709-012 v s = 5v v out = 2v p-p g = ?1, r f = r g = 499 ? g = +1, r f = 550 ? g = +2, r f = r g = 499 ? g = +5, r f = 348 ? , r g = 86.6 ? g = +10, r f = 348 ? , r g = 38.3 ? figure 5. large signal frequency response for various gains 6.3 6.2 6.1 6.0 5.9 5.8 5.7 5.6 5.5 5.4 5.3 0.1 1 10 100 1000 closed-loop gain (db) frequency (mhz) 05709-003 g = +2 v out = 2v p-p r f = r g = 499 ? v s = +5v v s = 5v figure 6. large signal 0.1 db flatness 2 ?6 ?5 ?4 ?3 ?2 ?1 0 1 0.1 1 10 100 1000 normalized gain (db) frequency (mhz) 05709-007 v s = 5v v out = 0.2v p-p g = +1, r f = 550 ? g = +2, r f = r g = 499 ? g = ?1, r f = r g = 499 ? g = +5, r f = 348 ? , r g = 86.6 ? g = +10, r f = 348 ? , r g = 38.3 ? figure 7. small signal frequency response for various gains 2 ?6 ?5 ?4 ?3 ?2 ?1 0 1 0.1 1 10 100 1000 normalized gain (db) frequency (mhz) 05709-013 v s = 5v v out = 2v p-p g = ?1, r f = r g = 499 ? g = +1, r f = 550 ? g = +2, r f = r g = 499 ? g = +5, r f = 348 ? , r g = 86.6 ? g = +10, r f = 348 ? , r g = 38.3 ? figure 8. large signal frequency response for various gains 7 0 1 2 3 4 5 6 0.1 1 10 100 1000 closed-loop gain (db) frequency (mhz) 05709-014 v s = 5v g = +2 r f = r g = 499 ? v out = 4v p-p v out = 2v p-p v out = 1v p-p figure 9. large signal frequency response for various output levels
ada4860-1 rev. 0 | page 7 of 20 8 0 1 2 3 4 5 6 7 0.1 1 10 100 1000 closed-loop gain (db) frequency (mhz) 05709-009 v s = 5v g = +2 r g = r f v out = 0.2v p-p r f = 604 ? r f = 301 ? r f = 499 ? r f = 402 ? figure 10. small signal frequency response vs. r f 2 ?6 ?5 ?4 ?3 ?2 ?1 0 1 0.1 1 10 100 1000 normalized gain (db) frequency (mhz) 05709-006 v s = 5v v out = 0.2v p-p r l = 75 ? g = +1, r f = 550 ? g = +2, r f = r g = 499 ? figure 11. small signal frequency response for various gains 2 ?6 ?5 ?4 ?3 ?2 ?1 0 1 0.1 1 10 100 1000 normalized gain (db) frequency (mhz) 05709-015 v s = 5v v out = 2v p-p r l = 75 ? g = +1, r f = 550 ? g = +2, r f = r g = 499 ? figure 12. large signal frequency response for various gains 7 0 1 2 3 4 5 6 0.1 1 10 100 1000 closed-loop gain (db) frequency (mhz) 05709-004 v s = 5v g = +2 r g = r f v out = 2v p-p r f = 301 ? r f = 604 ? r f = 499 ? r f = 402 ? figure 13. large signal frequency response vs. r f 2 ?6 ?5 ?4 ?3 ?2 ?1 0 1 0.1 1 10 100 1000 normalized gain (db) frequency (mhz) 05709-005 v s = 5v v out = 0.2v p-p r l = 75 ? g = +1, r f = 550 ? g = +2, r f = r g = 499 ? figure 14. small signal frequency response for various gains 2 ?6 ?5 ?4 ?3 ?2 ?1 0 1 0.1 1 10 100 1000 normalized gain (db) frequency (mhz) 05709-016 v s = 5v v out = 2v p-p r l = 75 ? g = +1, r f = 550 ? g = +2, r f = r g = 499 ? figure 15. large signal frequency response for various gains
ada4860-1 rev. 0 | page 8 of 20 ? 40 ?110 ?100 ?90 ?80 ?70 ?60 ?50 1 10 100 distortion (dbc) frequency (mhz) 05709-017 v s = 5v g = +1 r f = 550 ? v out = 3v p-p, hd3 v out = 3v p-p, hd2 v out = 2v p-p, hd3 v out = 2v p-p, hd2 figure 16. harmonic distortion vs. frequency ? 40 ?110 ?100 ?90 ?80 ?70 ?60 ?50 1 10 100 distortion (dbc) frequency (mhz) 05709-018 v s = 5v g = +1 r f = 550 ? v out = 2v p-p, hd3 v out = 2v p-p, hd2 v out = 1v p-p, hd3 v out = 1v p-p, hd2 figure 17. harmonic distortion vs. frequency ? 40 ?110 ?100 ?90 ?80 ?70 ?60 ?50 1 10 100 distortion (dbc) frequency (mhz) 05709-061 g = +1 r f = 550 ? r l = 100 ? v out = 2v p-p, hd2 v s = 5v v out = 1v p-p, hd2 v s = +5v v out = 2v p-p, hd3 v s = 5v v out = 1v p-p, hd3 v s = +5v figure 18. harmonic distortion vs. frequency for various supplies ? 40 ?110 ?100 ?90 ?80 ?70 ?60 ?50 1 10 100 distortion (dbc) frequency (mhz) 05709-041 v s = 5v g = +2 r f = r g = 499 ? v out = 3v p-p, hd2 v out = 2v p-p, hd2 v out = 2v p-p, hd3 v out = 3v p-p, hd3 figure 19. harmonic distortion vs. frequency ? 40 ?110 ?100 ?90 ?80 ?70 ?60 ?50 1 10 100 distortion (dbc) frequency (mhz) 05709-019 v s = 5v g = +2 r f = r g = 499 ? v out = 2v p-p, hd3 v out = 2v p-p, hd2 v out = 1v p-p, hd3 v out = 1v p-p, hd2 figure 20. harmonic distortion vs. frequency ? 40 ?110 ?100 ?90 ?80 ?70 ?60 ?50 1 10 100 distortion (dbc) frequency (mhz) 05709-062 g = +2 r f = r g = 499 ? r l = 100 ? v out = 1v p-p, hd2 v s = +5v v out = 2v p-p, hd2 v s = 5v v out = 2v p-p, hd3 v s = 5v v out = 1v p-p, hd3 v s = +5v figure 21. harmonic distortion vs. frequency for various supplies
ada4860-1 rev. 0 | page 9 of 20 200 ?200 ?100 0 100 2.7 2.3 2.4 2.5 2.6 output voltage (mv) v s = 5v output voltage (v) +v s = 5v, ?v s = 0v 05709-033 g = +1 v out = 0.2v p-p r f = 550 ? time = 5ns/div v s = 5v v s = +5v figure 22. small signal transient response for various supplies 200 ?200 ?100 0 100 output voltage (mv) 05709-034 c l = 9pf c l = 6pf c l = 4pf v s = 5v g = +1 v out = 0.2v p-p r f = 550 ? time = 5ns/div figure 23. small signal transient response for various capacitor loads 2.7 2.3 2.4 2.5 2.6 output voltage (v) 05709-035 c l = 9pf c l = 6pf c l = 4pf v s = 5v g = +1 v out = 0.2v p-p r f = 550 ? time = 5ns/div figure 24. small signal transient response for various capacitor loads 200 ?200 ?100 0 100 2.7 2.3 2.4 2.5 2.6 output voltage (mv) v s = 5v output voltage (v) +v s = 5v, ?v s = 0v 05709-020 v s = +5v g = +2 v out = 0.2v p-p r f = r g = 499 ? time = 5ns/div v s = 5v figure 25. small signal transient response for various supplies 200 ?200 ?100 0 100 output voltage (mv) 05709-021 c l = 9pf v s = 5v g = +2 v out = 0.2v p-p r f = r g = 499 ? time = 5ns/div c l = 4pf c l = 6pf figure 26. small signal transient response for various capacitor loads 2.7 2.3 2.4 2.5 2.6 output voltage (v) 05709-022 c l = 9pf v s = 5v g = +2 v out = 0.2v p-p r f = r g = 499 ? time = 5ns/div c l = 4pf c l = 6pf figure 27. small signal transient response for various capacitor loads
ada4860-1 rev. 0 | page 10 of 20 1.5 ?1.5 ?0.5 ?1.0 0 0.5 1.0 4.0 1.0 1.5 2.5 3.0 2.0 3.5 output voltage (v) v s = 5v output voltage (v) +v s = 5v, ?v s = 0v 05709-036 g = +1 v out = 2v p-p r f = 550 ? time = 5ns/div v s = 5v v s = +5v figure 28. large signal transient response for various supplies 1.5 ?1.5 ?0.5 ?1.0 0 0.5 1.0 output voltage (v) 05709-037 v s = 5v g = +1 v out = 2v p-p r f = 550 ? time = 5ns/div c l = 9pf c l = 6pf c l = 4pf figure 29. large signal transient response for various capacitor loads 4.0 1.0 2.0 1.5 2.5 3.0 3.5 output voltage (v) 05709-039 v s = 5v g = +1 v out = 2v p-p r f = 550 ? time = 5ns/div c l = 9pf c l = 6pf c l = 4pf figure 30. large signal transient response for various capacitor loads 1.5 ?1.5 ?0.5 ?1.0 0 0.5 1.0 4.0 1.0 2.0 3.0 1.5 2.5 3.5 output voltage (v) v s = 5v output voltage (v) +v s = 5v, ?v s = 0v 05709-023 v s = +5v g = +2 v out = 2v p-p r f = r g = 499 ? time = 5ns/div v s = 5v figure 31. large signal transient response for various supplies 1.5 ?1.5 ?0.5 ?1.0 0 0.5 1.0 output voltage (v) 05709-024 v s = 5v g = +2 v out = 2v p-p r f = r g = 499 ? time = 5ns/div c l = 9pf c l = 6pf c l = 4pf figure 32. large signal transient response for various capacitor loads 4.0 1.0 2.0 1.5 2.5 3.0 3.5 output voltage (v) 05709-025 v s = 5v g = +2 v out = 2v p-p r f = r g = 499 ? time = 5ns/div c l = 9pf c l = 6pf c l = 4pf figure 33. large signal transient response for various capacitor loads
ada4860-1 rev. 0 | page 11 of 20 2500 2000 1500 1000 500 0 04 . 5 1600 0 200 400 600 800 1000 1200 1400 02 . 2 5 2.00 1.75 1.50 1.25 1.00 0.75 0.50 0.25 slew rate (v/s) input voltage (v p-p) 05709-028 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 slew rate (v/s) input voltage (v p-p) 05709-043 v s = 5v g = +1 r f = 550 ? positive slew rate negative slew rate v s = 5v g = +2 r f = r g = 499 ? positive slew rate negative slew rate figure 34. slew rate vs. input voltage 900 800 700 600 500 400 300 200 100 slew rate (v/s) 05709-026 02 . 5 2.0 1.5 1.0 0.5 input voltage (v p-p) positive slew rate negative slew rate v s = 5v g = +1 r f = 550 ? figure 35. slew rate vs. input voltage 1.00 0.75 v in 1v 0.50 0.25 0 ?0.25 ?0.50 ?0.75 ?1.00 settling time (%) 05709-027 t = 0s v s = 5v g = +2 v out = 2v p-p r f = r g = 499 ? time = 5ns/div figure 36. settling time rising edge figure 37. slew rate vs. input voltage 900 100 200 300 400 500 600 700 800 01 . 2 5 1.00 0.75 0.50 0.25 slew rate (v/s) input voltage (v p-p) 05709-029 v s = 5v g = +2 r f = r g = 499 ? positive slew rate negative slew rate figure 38. slew rate vs. input voltage 1.00 0.75 v in 1v 0.50 0.25 0 ?0.25 ?0.50 ?0.75 ?1.00 settling time (%) 05709-030 v s = 5v g = +2 v out = 2v p-p r f = r g = 499 ? time = 5ns/div t = 0s figure 39. settling time falling edge
ada4860-1 rev. 0 | page 12 of 20 30 25 20 15 10 5 0 input voltage noise (nv/ hz) 05709-031 10 100 1k 10k 100k 1m 10m 100m frequency (hz) v s = 5v, +5v figure 40. input voltage noise vs. frequency 0 ?70 ?60 ?50 ?40 ?30 ?20 ?10 0.1 1 10 100 1000 power supply rejection (db) frequency (mhz) 05709-053 v s = 5v g = +2 ?psr +psr figure 41. power supply re jection vs. frequency 6 ?6 ?5 ?4 ?3 ?2 ?1 0 1 2 3 4 5 0 1000900800700 600 500 400 300200100 output and input voltage (v) time (ns) 05709-040 v s = 5v g = +2 r f = r g = 499 ? f = 1mhz input voltage 2 output voltage figure 42. output overdrive recovery 110 100 90 80 70 60 50 40 30 20 10 0 input current noise (pa/ hz) 05709-032 10 100 1k 10k 100k 1m 10m 100m frequency (hz) noninverting input inverting input v s = 5v, +5v figure 43. input current noise vs. frequency 0 ?70 ?60 ?50 ?40 ?30 ?20 ?10 0.1 1 10 100 1000 common-mode rejection (db) frequency (mhz) 05709-055 v s = 5v v out = 200mv rms r f = 560 ? figure 44. common-mode rejection vs. frequency 5.5 ?0.5 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 1000900800700 600 500 400 300200100 output and input voltage (v) time (ns) 05709-042 v s = 5v g = +2 r f = r g = 499 ? f = 1mhz input voltage 2 output voltage figure 45. output overdrive recovery
ada4860-1 rev. 0 | page 13 of 20 1000 0.1 1 10 100 0 ?180 ?135 ?90 ?45 0.01 0.1 1 10 100 1000 transimpedance (k ? ) phase (degrees) frequency (mhz) 05709-054 phase transimpedance v s = 5v g = +2 40 30 20 10 0 ?10 ?20 ?30 ?40 ?5 ?4 ?3 ?2 ?1 0 1 2 4 35 input v os (mv) v cm (v) 05709-058 v s = 5v v s = +5v figure 49. input v os vs. common-mode voltage figure 46. transimpedance and phase vs. frequency 7.0 6.5 6.0 5.5 5.0 4.5 4.0 41 1110 98765 total supply current (ma) supply voltage (v) 05709-057 6.5 6.0 5.5 5.0 4.5 4.0 ?40 ?25 ?10 5 20 35 50 65 80 95 110 125 total supply current (ma) temperature (c) 05709-059 v s = 5v v s = +5v 2 figure 47. supply current at various supplies vs. temperature figure 50. supply current vs. supply voltage 10 ?10 ?8 ?6 ?4 ?2 0 2 4 6 8 ?5 ?4 ?3 ?2 ?1 0 1 2 3 4 5 input bias current (a) output voltage (v) 05709-056 v s = 5v v s = +5v figure 48. inverting input bias current vs. output voltage
ada4860-1 rev. 0 | page 14 of 20 application information power supply bypassing attention must be paid to bypassing the power supply pins of the ada4860-1. 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. generally, a 10 f tantalum capacitor located in close proximity to the ada4860-1 is required to provide good decoupling for lower frequency signals. in addition, a 0.1 f decoupling multilayer ceramic chip capacitor (mlcc) 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. feedback resistor selection the feedback resistor has a direct impact on the closed-loop bandwidth and stability of the current feedback op amp circuit. reducing the resistance below the recommended value can make the amplifier response peak and even become unstable. increasing the size of the feedback resistor reduces the closed- loop bandwidth. table 5 provides a convenient reference for quickly determining the feedback and gain set resistor values and bandwidth for common gain configurations. table 5. recommended values and frequency performance 1 gain r f () r g () ?3 db ss bw (mhz) ?3 db ls bw (mhz) large signal 0.1 db flatness +1 550 n/a 800 165 40 ?1 499 499 400 400 80 +2 499 499 520 230 125 +5 348 86.6 335 265 100 +10 348 38.3 165 195 28 1 conditions: v s = 5 v, t a = 25c, r l = 150 . figure 51 and figure 52 show the typical noninverting and inverting configurations and the recommended bypass capacitor values. 0 5709-010 0.1f 10f ?v s v in r g v out 10f 0.1f + v s + ada4860-1 + ? r f + figure 51. noninverting gain 0 5709-011 0.1f 10f ?v s v in v out 10f 0.1f +v s ada4860-1 + ? r f r g + + figure 52. inverting gain
ada4860-1 rev. 0 | page 15 of 20 driving capacitive loads if driving loads with a capacitive component is desired, the best frequency response is obtained by the addition of a small series resistance, as shown in figure 53 . figure 54 shows the optimum value for r series vs. capacitive load. the test was performed with a 50 mhz, 50% duty cycle pulse, with an amplitude of 200 mv p-p. the criteria for r series selection was based on maintaining approximately 1 db of peaking in small signal frequency response. it is worth noting that the frequency response of the circuit can be dominated by the passive roll-off of r series and c l . 05709-052 v in r l c l r series r f 750 ? ada4860-1 figure 53. driving capacitive loads 14 12 10 8 6 4 2 0 05 0 40 30 20 10 series resistance ( ? ) capacitive load (pf) 05709-060 figure 54. recommended r series vs. capacitive load power down pin the ada4860-1 is equipped with a power-down function. the power down pin allows the user to reduce the quiescent supply current when the amplifier is not being used. the power-down threshold levels are derived from the voltage applied to the ?v s pin. when used in single-supply applications, this is especially useful with conventional logic levels . the amplifier is powered down when the voltage applied to the power down pin is greater than (?v s + 0.5 v). the amplifier is enabled whenever the power down pin is left open, or the voltage on the power down pin is less than (?v s + 0.5 v). if the power down pin is not used, it should be connected to the negative supply. video amplifier with low differential gain and phase errors and wide 0.1 db flatness, the ada4860-1 is an ideal solution for consumer and professional video applications. figure 55 shows a typical video driver set for a noninverting gain of +2, where r f = r g = 499 . 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. 05709-038 75 ? cable 75? 75 ? v ou t ?v s +v s v in 0.1f 0.1f 10f 10f 75? cable 75 ? ada4860-1 + ? r f + + r g figure 55. video driver schematic single-supply operation single-supply operation can present certain challenges for the designer. for a detailed explanation on op amp single-supply operation, see application note an-581 .
ada4860-1 rev. 0 | page 16 of 20 optimizing flatness and bandwidth when using the ada4860-1, a variety of circuit conditions and parasitics can affect peaking, gain flatness, and ?3 db bandwidth. this section discusses how the ada4860-1 small signal responses can be dramatically altered with basic circuit changes and added stray capacitances, see the layout and circuit board parasitics section for more information. particularly with low closed-loop gains, the feedback resistor (r f ) effects peaking and gain flatness. however, with gain = +1, ?3 db bandwidth varies slightly, while gain = +2 has a much larger variation. for gain = +1, figure 56 shows the effect that various feedback resistors have on frequency response. in figure 56 , peaking is wide ranging yet ?3 db bandwidths vary by only 6%. in this case, the user must pick what is desired: more peaking or flatter bandwidth. figure 57 shows gain = +2 bandwidth and peaking variations vs. r f and r l . bandwidth delta vs. r l increase was approximately 17%. as r f is reduced from 560 to 301 , the ?3 db bandwidth changes 49%, with excessive compromises in peaking, see figure 57 . for more gain = +2 bandwidth variations vs. r f , see figure 10 and figure 13 . 2 ?6 ?5 ?4 ?3 ?2 ?1 0 1 1 100 10 10000 1000 normalized gain (db) frequency (mhz) 05709-044 v s = 5v g = +1 v out = 0.1v p-p r l = 100 ? r f = 560 ? r f = 680 ? r f = 910 ? r f = 1.5k ? figure 56. small signal frequency response vs. r f 2 ?6 ?5 ?4 ?3 ?2 ?1 0 1 1 100 10 1000 normalized gain (db) frequency (mhz) 05709-045 v s = 5v g = +2 v out = 0.1v p-p r g = r f r f = 301 ? , r l = 100 ? r f = 560 ? , r l = 100 ? r f = 560 ? , r l = 1k ? figure 57. small signal frequency response vs. r f vs. r l the impact of resistor case sizes was observed using the circuit drawn in figure 58 . the types and sizes chosen were 0402 case sized thin film and 1206 thick film. all other measurement conditions were kept constant except for the case size and resistor composition. 05709-049 added c load example r g 49.9 ? 49.9 ? + ? 50 ? r f added c j example dash line is plane clear out are a (except supply pins) during pc layout. figure 58. noninverting gain setup for illustration of parasitic effects, 50 system, r l = 100 in figure 59 , a slight ?3 db bandwidth delta of approximately +10% can be seen going from a small-to-large case size. the increase in bandwidth with the larger 1206 case size is caused by an increase in parasitic capacitance across the chip resistor. 1 ?6 ?5 ?4 ?3 ?2 ?1 0 1 100 10 1000 normalized gain (db) frequency (mhz) 05709-046 v s = 5v g = +2 v out = 0.1v p-p r g = r f = 560 ? r l = 100 ? 1206 resistor size 0402 resistor size figure 59. small signal frequenc y response vs. resistor size
ada4860-1 rev. 0 | page 17 of 20 layout and circuit board parasitics careful attention to printed circuit board (pcb) layout prevents associated board parasitics from becoming problematic and affecting gain flatness and ?3 db bandwidth. in the printed circuit environment, parasitics around the summing junction (inverting input) or output pins can alter pulse and frequency response. parasitic capacitance can be unintentionally created on a pc board via two parallel metal planes with a small vertical separation (in fr4). to avoid parasitic problems near the summing junction, signal line connections between the feedback and gain resistors should be kept as short as possible to minimize the inductance and stray capacitance. for similar reasons, termination and load resistors should be located as close as possible to the respective inputs. removing the ground plane on all layers from the area near and under the input and output pins reduces stray capacitance. in a second test, 5.6 pf of capacitance was added directly at the output of the gain = +2 amplifier. figure 61 shows the results. extra output capacitive loading on the ada4860-1 also causes bandwidth extensions, as seen in figure 61 . the effect on the gain = +2 circuit is more pronounced with lighter resistive loading (1 k). for pulse response behavior with added output capacitances, see figure 23 , figure 24 , figure 26 , figure 27 , figure 29 , figure 30 , figure 32 , and figure 33 . 3 ?6 ?5 ?4 ?3 ?2 ?1 1 2 0 1 100 10 1000 normalized gain (db) frequency (mhz) 05709-048 v s = 5v g = +2 v out = 0.1v p-p r f = r g = 560 ? r l = 1k ? , c l = 5.6pf extra r l = 100 ? , c l = 5.6pf extra r l = 1k ? , c l = 0pf r l = 100 ? , c l = 0pf to illustrate the affects of parasitic capacitance, a small capacitor of 0.4 pf from the amplifiers summing junction (inverting input) to ground was intentionally added. this was done on two boards with equal and opposite gains of +2 and ?2. figure 60 reveals the effects of parasitic capacitance at the summing junction for both noninverting and inverting gain circuits. with gain = +2, the additional 0.4 pf of added capacitance created an extra 43% ?3 db bandwidth extension, plus some extra peaking. for gain = ?2, a 5% increase in ?3 db bandwidth was created with an extra 0.4 pf on summing junction. figure 61. small signal frequency response vs. output capacitive load for more information on high speed board layout, go to: www.analog.com and www.analog.com/library/analogdialogue/archives/39- 09/layout.html . 1 ?6 ?5 ?4 ?3 ?2 ?1 0 1 100 10 1000 normalized gain (db) frequency (mhz) 05709-047 v s = 5v v out = 0.1v p-p r l = 100 ? g = +2, r f = 560 ? , c j = 0.4pf extra g = ?2, r f = 402 ? , c j = 0.4pf extra g = ?2, r f = 402 ? , c j = 0pf g = +2, r f = 560 ? , c j = 0pf figure 60. small signal frequency response vs. added summing junction capacitance
ada4860-1 rev. 0 | page 18 of 20 outline dimensions 1 3 4 5 2 6 2.90 bsc 1.60 bsc 2.80 bsc 1.90 bsc 0.95 bsc 0.22 0.08 10 4 0 0.50 0.30 0.15 max 1.30 1.15 0.90 seating plane 1.45 max 0.60 0.45 0.30 pin 1 indicator compliant to jedec standards mo-178-ab figure 62. 6-lead plastic surface-mount package [sot-23] (rj-6) dimensions shown in millimeters ordering guide model temperature range package description or dering quantity package option branding ADA4860-1YRJZ-RL 1 C40c to +105c 6-lead sot-23 10,000 rj-6 hkb ADA4860-1YRJZ-RL7 1 C40c to +105c 6-lead sot-23 3,000 rj-6 hkb ada4860-1yrjz-r2 1 C40c to +105c 6-lead sot-23 250 rj-6 hkb 1 z = pb-free part.
ada4860-1 rev. 0 | page 19 of 20 notes
ada4860-1 rev. 0 | page 20 of 20 notes ?2006 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d05709-0-4/06(0)

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