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high speed, g = +2, low cost, triple op amp ada4862-3 rev. a 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 ? 2005 analog devices, inc. all rights reserved. features ideal for rgb/hd/sd video supports 1080i/720p resolution high speed ?3 db bandwidth: 300 mhz slew rate: 750 v/s settling time: 9 ns ( 0.5%) 0.1 db flatness: 65 mhz differential gain: 0.02% differential phase: 0.03 wide supply range: 5 v to 12 v low power: 5.3 ma/amp low voltage offset (rto): 3.5 mv (typ) high output current: 25 ma also configurable for gains of +1, ?1 power-down applications consumer video professional video filter buffers pin configuration power down 1 1 power down 2 2 power down 3 3 +v s 4 v out 2 14 ?in 2 13 +in 2 12 ?v s 11 +in 1 5 +in 3 10 ?in 1 6 ?in 3 9 v out 1 7 v out 3 8 ada4862-3 550 550 550 550 550 550 05600-001 figure 1. 14-lead soic (r-14) general description the ada4862-3 (triple) is a low cost, high speed, internally fixed, g = +2 op amp, which provides excellent overall performance for high definition and rgb video applications. the 300 mhz, g = +2, ?3 db bandwidth, and 750 v/s slew rate make this amplifier well suited for many high speed applications. the ada4862-3 can also be configured to operate in gains of g = +1 and g = ?1. with its combination of low price, excellent differential gain (0.02%), differential phase (0.03), and 0.1 db flatness out to 65 mhz, this amplifier is ideal for both consumer and professional video applications. the ada4862-3 is designed to operate on supply voltages as low as +5 v and up to 5 v using only 5.3 ma/amp of supply current. to further reduce power consumption, each amplifier is equipped with a power-down feature that lowers the supply current to 200 a/amp. the ada4862-3 also consumes less board area because feedback and gain set resistors are on-chip. having the resistors on chip simplifies layout and minimizes the required board space. the ada4862-3 is available in a 14-lead soic package and is designed to work in the extended temperature range of ?40c to +105c. 6.1 5.1 0.1 1000 frequency (mhz) closed-loop gain (db) 1 10 100 6.0 5.9 5.8 5.7 5.6 5.5 5.4 5.3 5.2 g = +2 r l = 150 c l = 4pf v out = 2v p-p v s = +5v v s = 5v 05600-022 figure 2. large signal 0.1 db bandwidth for various supplies
ada4862-3 rev. a | page 2 of 16 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 applications ..................................................................................... 11 using the ada4862-3 in gains = +1, ?1 ................................ 11 video line driver ....................................................................... 13 single-supply operation ........................................................... 13 power down ................................................................................ 13 layout considerations ............................................................... 14 power supply bypassing ............................................................ 14 outline dimensions ....................................................................... 15 ordering guide .......................................................................... 15 revision history 8/05rev. 0 to rev. a changes to ordering guide .......................................................... 15 7/05revision 0: initial version
ada4862-3 rev. a | page 3 of 16 specifications v s = +5 v (@t a = 25 o c, g = +2, r l = 150 , unless otherwise noted). table 1. parameter conditions min typ max unit dynamic performance C3 db bandwidth v o = 0.2 v p-p 300 mhz v o = 2 v p-p 200 mhz g = +1 v o = 0.2 v p-p 620 mhz bandwidth for 0.1 db flatness v o = 2 v p-p 65 mhz +slew rate (rising edge) v o = 2 v p-p 750 v/s ?slew rate (falling edge) v o = 2 v p-p 600 v/s settling time to 0.5% v o = 2 v step 9 ns distortion/noise performance harmonic distortion hd2 f c = 1 mhz, v o = 2 v p-p ?81 dbc harmonic distortion hd3 f c = 1 mhz, v o = 2 v p-p ?88 dbc harmonic distortion hd2 f c = 5 mhz, v o = 2 v p-p ?68 dbc harmonic distortion hd3 f c = 5 mhz, v o = 2 v p-p ?76 dbc voltage noise (rto) f = 100 khz 10.6 nv/hz current noise (rti) f = 100 khz, +in 1.4 pa/hz differential gain 0.02 % differential phase 0.03 degrees crosstalk amplifier 1 driven, amplifier 2 output measured, f = 1 mhz ?75 db dc performance offset voltage (rto) referred to output (rto) ?25 +3.5 +25 mv +input bias current ?2.5 ?0.6 +1 a gain accuracy 1.9 2 2.1 v/v input characteristics input resistance +in 13 m input capacitance +in 2 pf input common-mode voltage range g = +1 1 to 4 v power down pin input voltage enabled 0.6 v power down 1.8 v bias current enabled ?3 a power down 115 a turn-on time 3.5 s turn-off time 200 ns output characteristics output overdrive recovery time (rise/fall) v in = +2.25 v to ?0.25 v 85/50 ns output voltage swing r l = 150 1.2 to 3.8 v output voltage swing r l = 1 k 1 to 4 v short-circuit current sinking or sourcing 65 ma power supply operating range 5 12 v total quiescent current enabled 14 16 18 ma quiescent current /amplifier power down = +v s 0.2 0.33 ma power supply rejection ratio (rto) db +psr +v s = 2 v to 3 v, ?v s = ?2.5 v ?52 ?55 db ?psr +v s = 2.5 v, ?v s = ?2 v to ?3 v power down pin = ?v s ?49 ?52 db
ada4862-3 rev. a | page 4 of 16 v s = 5 v (@t a = +25 o c, g = +2, r l = 150 , unless otherwise noted). table 2. parameter conditions min typ max unit dynamic performance C3 db bandwidth v o = 0.2 v p-p 310 mhz v o = 2 v p-p 260 mhz g = +1 v o = 0.2 v p-p 720 mhz bandwidth for 0.1 db flatness v o = 2 v p-p 54 mhz +slew rate (rising edge) v o = 2 v p-p 1050 v/s ?slew rate (falling edge) v o = 2 v p-p 830 v/s settling time to 0.5% v o = 2 v step 9 ns distortion/noise performance harmonic distortion hd2 f c = 1 mhz, v o = 2 v p-p ?87 dbc harmonic distortion hd3 f c = 1 mhz, v o = 2 v p-p ?100 dbc harmonic distortion hd2 f c = 5 mhz, v o = 2 v p-p ?74 dbc harmonic distortion hd3 f c = 5 mhz, v o = 2 v p-p ?90 dbc voltage noise (rto) f = 100 khz 10.6 nv/hz current noise (rti) f = 100 khz, +in 1.4 pa/hz differential gain 0.01 % differential phase 0.02 degrees crosstalk amplifier 1 driven, amplifier 2 output measured, f = 1 mhz ?75 db dc performance offset voltage (rto) ?25 +2 +25 mv +input bias current ?2.5 ?0.6 +1 a gain accuracy 1.9 2 2.1 v/v input characteristics input resistance +in 14 m input capacitance +in 2 pf input common-mode voltage range g = +1 ?3.7 to +3.8 v power down pin input voltage enabled ?4.4 v power down ?3.2 v bias current enabled ?3 a power down 250 a turn-on time 3.5 s turn-off time 200 ns output characteristics output overdrive recovery time (rise/fall) v in = 3.0 v 85/40 ns output voltage swing r l = 150 ?3.5 to +3.5 v output voltage swing r l = 1 k ?3.9 to +3.9 v short-circuit current sinking or sourcing 115 ma power supply operating range 5 12 v total quiescent current enabled 14.5 17.9 20.5 ma quiescent current/amplifier power down = +v s 0.3 0.5 ma power supply rejection ratio (rto) db +psr +v s = 4 v to 6 v, ?v s = ?5 v ?54 ?57 db ?psr +v s = 5 v, ?v s = ?4 v to ?6 v, power down pin = ?v s +50.5 ?54 db
ada4862-3 rev. a | page 5 of 16 absolute maximum ratings table 3. parameter rating supply voltage 12.6 v power dissipation see figure 3 common-mode input voltage v s storage temperature ?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 14-lead soic 90 c/w maximum power dissipation the maximum safe power dissipation for the ada4862-3 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 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. 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 amplifiers drive at the output. the quiescent power is the voltage between the supply pins (v s ) the quiescent current (i s ). p d = quiescent power + ( total d r ive power ? load power ) () l out l out s ss d r v r vv ivp 2 C 2 ? ? ? ? ? ? += 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 3 shows the maximum safe power dissipation in the package vs. the ambient temperature for the 14-lead soic (90c/w) on a jedec standard 4-layer board. ja values are approximations. 2.5 0 ambient temperature ( c) maximum power dissipation (w) 05600-036 ?55 125 ?45 ?35 ?25 ?15 ?5 5 15 25 35 45 55 65 75 85 95 105 115 2.0 1.5 1.0 0.5 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 precautions are recommended to avoid performance degradation or loss of functionality.
ada4862-3 rev. a | page 6 of 16 typical performance characteristics 8 0 0.1 1000 frequency (mhz) closed-loop gain (db) 1 10 100 7 6 5 4 3 2 1 g = +2 r l = 150 c l = 4pf v out = 0.2v p-p v s = +5v v s = 5v 05600-004 figure 4. small signal frequency response for various supplies 8 0 0.1 1000 frequency (mhz) closed-loop gain (db) 1 10 100 7 6 5 4 3 2 1 v s = 5v v s = +5v g = +2 r l = 150 c l = 4pf v out = 2v p-p 05600-012 figure 5. large signal frequency response for various supplies 6.1 5.1 0.1 1000 frequency (mhz) closed-loop gain (db) 1 10 100 6.0 5.9 5.8 5.7 5.6 5.5 5.4 5.3 5.2 g = +2 r l = 150 c l = 4pf v out = 2v p-p v s = +5v v s = 5v 05600-022 figure 6. large signal 0.1 db bandwidth for various supplies 200 2.7 ?200 2.3 100 2.6 0 2.5 ?100 2.4 v s = +5v v s = 5v g = +2 r l = 150 c l = 4pf v out = 0.2v p-p time = 5ns/div 05600-028 output voltage (mv) v s = 5v output voltage (v) +v s = 5v, ?v s = 0v figure 7. small signal transient response for various supplies 200 ?200 output voltage (v) 150 100 50 0 ?50 ?100 ?150 g = +2 r l = 150 c l = 4pf v out = 0.2v p-p v s = 5v time = 5ns/div c l = 9pf c l = 6pf c l = 4pf 05600-016 figure 8. small signal transient response for various capacitor loads output voltage (v) 2.7 2.3 2.6 2.5 2.4 c l = 6pf c l = 9pf c l = 4pf g = +2 r l = 150 v out = 0.2v p-p v s = 5v time = 5ns/div 05600-014 figure 9. small signal transient response for various capacitor loads
ada4862-3 rev. a | page 7 of 16 1.5 4.0 ?1.5 1.0 output voltage (v) v s = 5v output voltage (v) +v s = 5v, ?v s = 0v 1.0 3.5 0.5 3.0 0 2.5 ?0.5 2.0 ?1.0 1.5 v s = +5v v s = 5v g = +2 r l = 150 c l = 4pf v out = 2v p-p time = 5ns/div 05600-010 figure 10. large signal transient response for various supplies 1.5 ?1.5 output voltage (v) 1.0 0.5 0 ?0.5 ?1.0 c l = 9pf c l = 6pf c l = 4pf g = +2 r l = 150 c l = 4pf v out = 2v p-p v s = 5v time = 5ns/div 05600-018 figure 11. large signal transient response for various capacitor loads 4.0 1.0 output voltage (v) 3.5 3.0 2.5 2.0 1.5 c l = 4pf c l = 9pf c l = 6pf g = +2 r l = 150 c l = 4pf v out = 2v p-p v s = 5v time = 5ns/div 05600-019 figure 12. large signal transient response for various capacitor loads 6 ?6 0 1000 time (ns) output and input voltage (v) 05600-042 5 4 3 2 1 0 ?1 ?2 ?3 ?4 ?5 100 200 300 400 500 600 700 800 900 v s = 5v g = +2 r l = 150 c l = 4pf f = 1mhz v out input voltage 2 figure 13. input overdrive recovery 5.5 ?0.5 0 1000 time (ns) output and input voltage (v) 05600-041 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 100 200 300 400 500 600 700 800 900 v s = 5v g = +2 r l = 150 c l = 4pf f = 1mhz v out input voltage 2 figure 14. output overdrive recovery
ada4862-3 rev. a | page 8 of 16 time (ns) v out and v in (v) v out expanded (mv) 05600-043 1.5 ?1.5 05 0 1.0 0.5 0 ?0.5 ?1.0 5 1015202530354045 ?20 ?15 ?10 ?5 0 5 10 15 20 1.5 ?1.5 05 0 time (ns) v out and v in (v) v out expanded (mv) 05600-046 ?20 ?15 ?10 ?5 0 5 10 15 20 v s = 5v, +5v g = +2 v out = 2v p-p r l =150 c l = 4pf v out expanded v out v in figure 15. settling time falling edge 1600 0 0 5.0 output voltage step (v p-p) slew rate (v/ s) 1400 1200 1000 800 600 400 200 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 g = +2 v s = 5v r l = 150 c l = 4pf positive slew rate negative slew rate 05600-005 figure 16. slew rate vs. output voltage 100 1 10 100m 05600-037 frequency (hz) voltage noise (nv/ hz) 100 1k 10k 100k 1m 10m 10 g = +2 r l = 150 c l = 4pf v out = 2v p-p v s = 5v v s = +5v figure 17. voltage noise vs. frequency referred to output (rto) v out 1.0 0.5 0 ?0.5 ?1.0 v in v out expanded v s = 5v, +5v g = +2 v out = 2v p-p r l = 150 c l = 4pf 5 1015202530354045 figure 18. settling time rising edge 800 0 0 3.0 output voltage step (v p-p) slew rate (v/ s) 700 600 500 400 300 200 100 0.5 1.0 1.5 2.0 2.5 g = +2 v s = 5v r l = 150 c l = 4pf positive slew rate negative slew rate 05600-006 figure 19. slew rate vs. output voltage 0 ?120 0.1 1000 frequency (mhz) crosstalk (db) 1 10 100 ?20 ?40 ?60 ?80 ?100 g = +2 r l = 150 c l = 4pf v out = 2v p-p v s = 5v v s = +5v 05600-023 figure 20. large signal crosstalk
ada4862-3 rev. a | page 9 of 16 19 15 4 12 supply voltage (v) total supply current (ma) 18 17 16 567891011 05600-026 figure 21. total supply current vs. v supply 20 12 ?40 125 temperature ( c) total supply current (ma) 19 18 17 16 15 14 13 ?25?105 203550658095110 v s = 5v v s = +5v 05600-021 figure 22. total supply current at various supplies vs. temperature 0 ?70 0.01 1000 frequency (mhz) power supply rejection (db) 05600-051 0.1 1 10 100 ?10 ?20 ?30 ?40 ?50 ?60 v s = 5v ?psr +psr figure 23. power supply rejection vs. frequency 0 0.01 1000 frequency (mhz) power supply rejection (db) 05600-052 0.1 1 10 100 ?10 ?20 ?30 ?40 ?50 ?60 v s = 2.5v ?psr +psr figure 24. power supply rejection vs. frequency
ada4862-3 rev. a | page 10 of 16 ?50 ?110 04 output voltage (v p-p) distortion (dbc) 05600-049 ?60 ?70 ?80 ?90 ?100 123 f o = 1mhz f o = 2mhz f o = 5mhz f o = 10mhz f o = 20mhz g = +2 r l = 150 c l = 4pf hd2 v s = 5v figure 25. hd2 vs. frequency vs. output voltage ?50 ?110 0 2.5 output voltage (v p-p) distortion (dbc) 05600-050 ?60 ?70 ?80 ?90 ?100 g = +2 r l = 150 c l = 4pf hd2 v s = 5v f o = 2mhz f o = 1mhz f o = 10mhz f o = 20mhz f o = 5mhz 0.5 1.0 1.5 2.0 figure 26. hd2 vs. frequency vs. output voltage ?50 ?130 04 output voltage (v p-p) distortion (dbc) 05600-054 ?60 ?70 ?80 ?90 ?100 ?110 ?120 123 g = +2 r l = 150 c l = 4pf hd3 v s = 5v f o = 20mhz f o = 5mhz f o = 2mhz f o = 1mhz f o = 10mhz figure 27. hd3 vs. frequency vs. output voltage ?50 ?130 0 2.5 output voltage (v p-p) distortion (dbc) 05600-048 ?60 ?70 ?80 ?90 ?100 ?110 ?120 0.5 1.0 1.5 2.0 f o = 20mhz f o = 5mhz f o = 2mhz f o = 1mhz g = +2 r l = 150 c l = 4pf hd3 v s = +5v f o = 10mhz figure 28. hd3 vs. frequency vs. output voltage
ada4862-3 rev. a | page 11 of 16 applications using the ada4862-3 in gains = +1, ?1 the ada4862-3 was designed to offer outstanding video performance, simplify applications, and minimize board area. the ada4862-3 is a triple amplifier with on-chip feedback and gain set resistors. the gain is fixed internally at g = +2. the inclusion of the on-chip resistors not only simplifies the design of the application but also eliminates six surface-mount resistors, saving valuable board space and lowers assembly costs. a typical schematic is shown in figure 29 . 0.01 f 0.01 f v in r t v out +v s ?v s gain of +2 05600-029 10 f 10 f figure 29. noninverting configuration (g = +2) while the ada4862-3 has a fixed gain of g = +2, it can be used in other gain configurations, such as g = ?1 and g = +1, which are discussed next. unity-gain operation (option 1) there are two options for obtaining unity gain (g = +1). the first is shown in figure 30 . in this configuration, the Cin input pin is left floating (feedback is provided via the internal 550 ), and the input is applied to the noninverting input. the noise gain for this configuration is 1. frequency performance and transient response are shown in figure 31 through figure 33 . 0.01 f 10 f 10 f 0.01 f v in r t v out +v s ?v s gain of +1 05600-032 figure 30. unity gain of option 1 4 ?4 0.1 1000 frequency (mhz) closed-loop gain (db) 05600-053 1 10 100 3 2 1 0 ?1 ?2 ?3 g = +1 r l = 150 c l = 4pf v out = 200mv p-p v s = 5v v s = +5v figure 31. small signal unity gain 3 ?6 0.1 1000 frequency (mhz) closed-loop gain (db) 05600-002 1 10 100 2 1 0 ?1 ?2 ?3 ?4 ?5 v s = +5v v s = 5v g = +1 r l = 150 c l = 4pf v out = 2v p-p figure 32. large signal gain +1 2.0 ?2.0 output voltage (v) 1.5 1.0 0.5 0 ?0.5 ?1.0 ?1.5 c l = 4pf c l = 9pf c l = 6pf g = +1 r l = 150 v out = 2v p-p v s = 5v time = 5ns/div 05600-020 figure 33. large signal transient response for various capacitor loads
ada4862-3 rev. a | page 12 of 16 option 2 another option exists for running the ada4862-3 as a unity- gain amplifier. in this configuration, the noise gain is 2, see figure 34 . the frequency response and transient response for this configuration closely match the gain of +2 plots because the noise gains are equal. this method does have twice the noise gain of option 1; however, in applications that do not require low noise, option 2 offers less peaking and ringing. by tying the inputs together, the net gain of the amplifier becomes 1. equation 1 shows the transfer characteristic for the schematic shown in figure 34 . frequency and transient response are shown in figure 35 and figure 36 . ? ? ? ? ? ? ? ? + + ? ? ? ? ? ? ? ? ? = g g f i g f i o r rr v r r vv (1) which simplifies to v o = v i . 0.01 f 0.01 f v in r t v out +v s ?v s gain of +1 05600-030 10 f 10 f r f r g figure 34. unity gain of option 2 1 ?7 0.1 1000 frequency (mhz) gain (db) 1 10 100 0 ?1 ?2 ?3 ?4 ?5 ?6 g = +1 r l = 150 05600-027 figure 35. frequency response of option 2 05600-039 g = +1 v s = 5v r l = 150 time = 2ns/div 200 output voltage (mv) 150 100 50 0 ?50 ?100 ?150 ?200 figure 36. small signals transient response of option 2 0.01 f 0.01 f v in r t v out +v s ?v s gain of ?1 05600-031 10 f 10 f figure 37. inverting configuration (g = ?1) 2.0 ?2.0 output voltage (v) 1.5 1.0 0.5 0 ?0.5 ?1.0 ?1.5 c l = 9pf c l = 6pf c l = 4pf g = ?1 r l = 150 v out = 2v p-p v s = 5v time = 5ns/div 05600-017 figure 38. large signal transient response for various capacitor loads
ada4862-3 rev. a | page 13 of 16 video line driver the ada4862-3 was designed to excel in video driver applications. figure 39 shows a typical schematic for a video driver operating on a bipolar supplies. 75 cable 75 75 v out ?v s +v s v in 0.1 f 0.1 f 10 f 10 f 75 cable 75 05600-033 ada4862-3 + ? figure 39. video driver schematic in applications that require two video loads be driven simultaneously, the ada4862-3 can deliver. figure 40 shows the ada4862-3 configured with dual video loads. figure 41 shows the dual video load performance. 75 cable 75 cable 75 75 75 75 v out 2 v out 1 ?v s +v s v in 0.1 f 0.1 f 10 f 10 f 75 cable 75 05600-034 + 2 1 8 7 6 ? figure 40. video driver schematic for two video loads 8 0 0.1 1000 frequency (mhz) closed-loop gain (db) 1 10 100 7 6 5 4 3 2 1 g = +2 r l = 75 c l = 4pf v out = 2v p-p v s = 5v v s = +5v 05600-008 figure 41. large signal frequency response for various supplies, r l = 75 single-supply operation the ada4862-3 can also operate in single-supply applications. figure 42 shows the schematic for a single 5 v supply video driver. resistors r2 and r4 establish the midsupply reference. capacitor c2 is the bypass capacitor for the midsupply reference. capacitor c1 is the input coupling capacitor, and c6 is the output coupling capacitor. capacitor c5 prevents constant current from being drawn through the internal gain set resistor. resistor r3 sets the circuits ac input impedance. for more information on single-supply operation of op amps, see www.analog.com/library/ana logdialogue/archives/35- 02/avoiding/ . c2 1 f r2 50k r4 50k r3 1k c1 22 f r1 50 c6 220 f r5 75 r6 75 c5 22 f ada4862-3 +5v 05600-035 v out v in ?v s c3 2.2 f c4 0.01 f +5v figure 42. single-supply video driver schematic power down the ada4862-3 is equipped with an independent power down pin for each amplifier allowing the user to reduce the supply current when an amplifier is inactive. the voltage applied to the ?v s pin is the logic reference, making single-supply applications useful with conventional logic levels . in a typical 5 v single- supply application, the ?v s pin is connected to analog ground. the amplifiers are powered down when applied logic levels are greater than ?v s + 1 v. the amplifiers are enabled whenever the disable pins are left either floating (disconnected) or the applied logic levels are lower than 1 v above ?v s .
ada4862-3 rev. a | page 14 of 16 layout considerations as is the case with all high speed applications, careful attention to printed circuit board layout details prevents associated board parasitics from becoming problematic. proper rf design technique is mandatory. 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 the input and output pins reduces stray capacitance. 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) though the board. adherence to microstrip or stripline design techniques for long signal traces (greater than about 1 inch) is recommended. power supply bypassing careful attention must be paid to bypassing the power supply pins of the ada4862-3. 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, 10 f to 47 f capacitor located in proximity to the ada4862-3 is required to provide good decoupling for lower frequency signals. 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 1/8 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.
ada4862-3 rev. a | page 15 of 16 outline dimensions controlling dimensions are in millimeters; inch dimensions (in parentheses) are rounded-off millimeter equivalents for reference only and are not appropriate for use in design compliant to jedec standards ms-012-ab coplanarity 0.10 14 8 7 1 6.20 (0.2441) 5.80 (0.2283) 4.00 (0.1575) 3.80 (0.1496) 8.75 (0.3445) 8.55 (0.3366) 1.27 (0.0500) bsc seating plane 0.25 (0.0098) 0.10 (0.0039) 0.51 (0.0201) 0.31 (0.0122) 1.75 (0.0689) 1.35 (0.0531) 8 0 0.50 (0.0197) 0.25 (0.0098) 1.27 (0.0500) 0.40 (0.0157) 0.25 (0.0098) 0.17 (0.0067) 45 figure 43. 14-lead standard small outline package [soic_n] narrow body (r-14) dimensions shown in millimeters and (inches) ordering guide model temperature range package descript ion ordering quantity package option ada4862-3yrz 1 C40c to +105c 14-lead soic_n 1 r-14 ADA4862-3YRZ-RL 1 C40c to +105c 14-lead soic_n 2,500 r-14 ADA4862-3YRZ-RL7 1 C40c to +105c 14-lead soic_n 1,000 r-14 1 z = pb-free part.
ada4862-3 rev. a | page 16 of 16 notes ? 2005 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d05600C0C8/05(a)

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