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may 2006 1 mic923 mic923 micrel, inc. mic923 410mhz low-power sc70 op amp general description the mic923 is a high-speed operational ampli?er with a gain-bandwidth product of 410mhz. the part is unity gain stable. it has a very low 2.5ma supply current, and features the teeny? sc70 package. supply voltage range is from 2.5v to 9v, allowing the mic923 to be used in low-voltage circuits or applications requiring large dynamic range. the mic923 requires a minimum gain of +2 or C1 but is stable driving any capacitive load. it has excellent psrr and cmrr, making it much easier to use than most conventional high- speed devices. low supply voltage, low power consumption, and small packaging makes the mic923 ideal for portable equipment. the ability to drive capacitative loads also makes it possible to drive long coaxial cables. features ? 410mhz gain bandwidth product ? 2.5ma supply current ? teeny? sc70 packaging ? 2200v/s slew rate ? drives any capacitive load ? stable with gain 2 or C1 applications ? video ? imaging ? ultrasound ? portable equipment ? line drivers micrel, inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel + 1 (408) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com pin con?guration in+ vC out inC 1 3 4 5 2 v+ a40 part identification sc-70 pin description pin number pin name pin function 1 in+ noninverting input 2 vC negative supply (input) 3 inC inverting input 4 out output: ampli?er output 5 v+ positive supply (input) functional pinout in+ vC out inC 1 3 4 5 2 v+ sc-70 teeny is a trademark of micrel, inc. ordering information part number ambient temperature package standard marking pb-free marking mic923bc5 a40 MIC923YC5 a 4 0 C 40 o c to +85 o c sc-70-5
mic923 micrel, inc. mic923 2 may 2006 absolute maximum ratings (note 1) supply voltage (v v+ C v vC ) ........................................... 20v differential input voltage ( ? v in+ C v inC ? ) ........... 4v, note 3 input common-mode range (v in+ , v inC ) ............ v v+ to v vC lead temperature (soldering, 5 sec.) ........................ 260c storage temperature (t s ) ......................................... 150c esd rating, note 4 ................................................... 1.5kv operating ratings (note 2) supply voltage (v s ) ......................................... 2.5v to 9v junction temperature (t j ) .......................... C40c to +85c package thermal resistance sc70-5 ( ja ) ...................................................... 450c/w electrical characteristics (5v) v+ = +5v, vC = C5v, v cm = 0v, r l = 10m; t j = 25c, bold values indicate C40c t j +85c; unless noted. symbol parameter condition min typ max units v os input offset voltage -5 0.8 5 mv v os v os temperature coef?cient 15 v/c i b input bias current 1.7 4.5 a i os input offset current -2 0.3 2 a v cm input common-mode range C3.25 +3.25 v cmrr common-mode rejection ratio C2.5v < v cm < +2.5v 75 80 db psrr power supply rejection ratio 3.5v < v s < 9v 68 87 db a vol large-signal voltage gain r l = 2k, v out = 2v 65 74 db r l = 100, v out = 1v 77 db v out maximum output voltage swing positive, r l = 2k +3 3.6 v negative, r l = 2k C3.6 C3 v positive, r l = 100 +2.7 3.0 v negative, r l = 100, note 5 C2.6 C2.3 v gbw gain-bandwidth product c l = 1.7pf 320 mhz sr slew rate c=1.7pf, av =2, r l = 1m, r f = 2k 970 v/s negative sr = 720v/s i sc short-circuit output current source 65 78 ma sink 40 47 ma i s supply current no load 2.5 3 ma input voltage noise f = 10khz 9 nv/ hz input current noise f = 10khz 1.1 pa/ hz electrical characteristics v+ = +9v, vC = C9v, v cm = 0v, r l = 10m; t j = 25c, bold values indicate C40c t j +85c; unless noted symbol parameter condition min typ max units v os input offset voltage -5 0.4 5 mv v os input offset voltage 15 v/c temperature coef?cient i b input bias current 1.7 4.5 a i os input offset current 0.3 2 a v cm input common-mode range C7.25 +7.25 v cmrr common-mode rejection ratio C6.5v < v cm < +6.5v 58 83 db psrr power supply rejection ratio 3.5v < v s < 9v 68 87 db
may 2006 3 mic923 mic923 micrel, inc. symbol parameter condition min typ max units a vol large-signal voltage gain r l = 2k, v out = 3v 65 76 db r l = 100, v out = 1v 86 db v out maximum output voltage swing positive, r l = 2k 7 7.5 v negative, r l = 2k C7.5 C7 v gbw gain-bandwidth product c l = 1.7pf, r l = 100 410 mhz sr slew rate c=1.7pf, av =2, r l = 1m, r f = 2k 2200 v/s positive sr = 2100v/s i sc short-circuit output current source 70 84 ma sink 40 50 ma i s supply current no load 2.5 3 ma input voltage noise f = 10khz 9 nv/ hz input current noise f = 10khz 1.1 pa/ hz note 1. exceeding the absolute maximum rating may damage the device. note 2. the device is not guaranteed to function outside its operating rating. note 3. exceeding the maximum differential input voltage will damage the input stage and degrade performance (in particular, input bias current is likely to change). note 4. devices are esd sensitive. handling precautions recommended. human body model, 1.5k in series with 100pf . note 5. output swing limited by the maximum output sink capability, refer to the short-circuit current vs. temperature graph in typical characteristics.
mic923 micrel, inc. mic923 4 may 2006 test circuits 2k 10k 10k 10k 0.1f 0.1f 0.1f 10f 50? 50? 50? 0.1f 10f all resistors: 1% metal film output input input v+ vC mic923 4 5 3 1 2 bnc bnc bnc psrr vs. frequency r2 4k s2 s1 0.1f 10f 0.1f 10f 10pf 10pf v+ vC mic923 4 5 3 1 2 bnc r4 27k r3 27k r1 20? r5 20? 100pf t o dynamic analyzer noise measurement 0.1f 10f 0.1f 10f v+ vC mic923 4 5 3 1 2 bnc r7c 2k r7b 200? r7a 100? input r6 5k r2 5k r3 200k r4 250? r5 5k output r1 5k bnc all resistors 1% v v r2 r1 r2 r r4 out error = + + + + ? ? ? ? ? ? 1 5 r7 cmrr vs. frequency v+ v in vC mic923 4 5 3 1 2 300? 50? v out fe t prob e 1k c l 0.1f 10f 0.1f 10f closed loop frequency response measurement
may 2006 5 mic923 mic923 micrel, inc. typical characteristics 2.35 2.4 2.45 2.5 2.55 2.6 2.65 2. 5 3. 5 4. 5 5. 5 6. 5 7. 5 8. 5 9.5 ) a m ( t n e r r u c y l p p u s supply voltage ( v) supply current vs. supply voltage C 40 c 25 c 85 c 2.3 2.35 2.4 2.45 2.5 2.55 2.6 2.65 2.7 -4 0 -2 0 0 2 0 4 0 6 0 8 0 100 ) a m ( t n e r r u c y l p p u s temperature ( c) supply current vs. temperature 9v 2.5v 5v 0 0.5 1 1.5 2 2.5 -4 0 -2 0 0 2 0 4 0 6 0 8 0 100 / v ( e t a r w e l s ) s load capacitance (pf) positive slew rate vs. load capacitance 5v 9v 2.5v -3 -2 -1 0 1 2 3 4 5 6 7 8 - 5 - 4 - 3 - 2 - 1 0 1 2 3 4 5 ) v m ( e g a t l o v t e s f f o common-mode voltage (v) offset voltage vs. common-mode voltage v cc = 5v 85 c C 40 c 25 c 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 -4 0 -2 0 0 2 0 4 0 6 0 8 0 100 ) v m ( e g a t l o v t e s f f o temperature ( c) offset voltage vs. temperature 2.5v 5v 9v -3 -2 -1 0 1 2 3 4 5 6 7 8 - 5 - 4 - 3 - 2 - 1 0 1 2 3 4 5 ) v m ( e g a t l o v t e s f f o common-mode voltage (v) offset voltage vs. common-mode voltage v = 9v C 40 c 85 c 25 c 0 0.5 1.0 1.5 2.0 2.5 3.0 -4 0 -2 0 0 2 0 4 0 6 0 8 0 100 ( t n e r r u c s a i b ) a temperature (ma) bias current vs. temperature 9v 2.5v 5v 2.30 2.35 2.40 2.45 2.50 2.55 2.60 2.65 2. 5 3. 5 4. 5 5. 5 6. 5 7. 5 8. 5 9.5 ) a m ( t n e r r u c y l p p u s supply voltage (v) supply current vs. supply voltage C 40 c +85 c +25 c 0 0.9 1.8 2.7 3.6 4.5 5.4 6.3 7.2 8.1 9.0 9.9 0 9 1 8 2 7 3 6 4 5 5 4 6 3 7 2 8 1 90 ) v ( e g a t l o v t u p t u o output current (ma) output voltage vs. output current sourcing v = 9v C 40 c 25 c 85 c 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 0 9 1 8 2 7 3 6 4 5 5 4 6 3 7 2 8 1 90 ) v ( e g a t l o v t u p t u o output current (ma) output voltage vs. output current C 40 c +85 c +25 c sourcing v = 5v 2.25 2.30 2.35 2.40 2.45 2.50 2.55 2. 5 3. 5 4. 5 5. 5 6. 5 7. 5 8. 5 9.5 ) a m ( t n e r r u c y l p p u s supply voltage (v) supply current vs. supply voltage C 40 c +85 c +25 c 0.0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0 4.4 5 . 2 0 . 3 5 . 3 0 . 4 5 . 4 0 . 5 5 . 5 0 . 6 5 . 6 0 . 7 5 . 7 0 . 8 5 . 8 0 . 9 ) a m ( t n e r r u c y l p p u s supply voltage ( v) supply current vs. supply voltage C 40 c 25 c 85 c
mic923 micrel, inc. mic923 6 may 2006 100m 10m 1m -15 -10 -5 0 5 10 15 20 25 30 35 ) b d ( n i a g frequency (hz) closed loop frequency response av = 4 v = 5v -360 -315 -270 -225 -180 -135 -90 -45 0 45 90 ( n i g r a m e s a h p ) phase margin gain bandwidth 100m 10m 1m -15 -10 -5 0 5 10 15 20 25 30 35 ) b d ( n i a g frequency (hz) closed loop frequency av = 4 v = 2.5v -360 -315 -270 -225 -180 -135 -90 -45 0 45 90 ( n i g r a m e s a h p ) gain bandwidth phase margin 100m 10m 1m -50 -40 -30 -20 -10 0 10 20 30 40 50 ) b d ( n i a g p o o l - n e p o frequency (hz) open-loop gain vs. frequency v = 9v 1000pf 470pf 680pf 220pf 100pf 1.7pf -50 -40 -30 -20 -10 0 10 20 30 40 50 1x10 6 10x10 6 100x10 6 500x10 6 ) b d ( n i a g p o o l - n e p o frequency (hz) open-loop gain vs. frequency v = 5v 100m 1m 10m 1000pf 680pf 470pf 220pf 100pf 1.7pf 0 9 18 27 36 45 54 63 72 81 90 99 2 3. 4 4. 8 6. 2 7. 6 9 ) a m ( t n e r r u c t i u c r i c t r o h s supply voltage ( v) short circuit current vs. supply voltage sourcing v = 9v C 40 c 25 c 85 c -15 -10 -5 0 5 10 15 20 25 30 35 ) b d ( n i a g frequency (hz) closed loop frequency response av = 4 v = 9v -360 -315 -270 -225 -180 -135 -90 -45 0 45 90 ( n i g r a m e s a h p ) phase margin gain bandwidth 1m 10m -50 -40 -30 -20 -10 0 10 20 30 40 50 ) b d ( n i a g frequency (hz) closed loop frequency response 100m 2.5v 5v 9v -30 -20 -10 0 10 20 30 40 50 60 70 2x10 6 10x10 6 100x10 6 500x10 6 ) b d ( h t d i w d n a b n i a g frequency (hz) open-loop frequency response v = 9v 100 1 k 10 k 100 k 1 m 10m no load 100 ? 100 ? no load gain phase -135 -90 -45 0 45 90 135 180 225 270 315 ( e s a h p ) -9.0 -8.1 -7.2 -6.3 -5.4 -4.5 -3.6 -2.7 -1.8 -0.9 0 0.9 -6 0 -4 8 -3 6 -2 4 -1 2 0 ) v ( e g a t l o v t u p t u o output current (ma) output voltage vs. output current sinking v = 9v C 40 c 25 c 85 c -60 -54 -48 -42 -36 -30 -24 -18 -12 -6 0 6 2. 0 3. 4 4. 8 6. 2 7. 6 9.0 ) a m ( t n e r u c t i u c r i c t r o h s supply voltage ( v) short circuit current vs. supply voltage sinking C 40 c 25 c 85 c -5.0 -4.5 -4.0 -3.5 -3.0 -2.5 -2.0 -1.5 -1.0 -0.5 0 0.5 -5 0 -4 0 -3 0 -2 0 -1 0 0 ) v ( e g a t l o v t u p t u o output current (ma) output voltage vs. output current sinking v = 5v C 40 c 25 c 85 c 100m 2m -30 -20 -10 0 10 20 30 40 50 60 70 ) b d ( h t d i w d n a b n i a g frequency (hz) open-loop frequency response v = 5v 10m gain phase no load 100 ? no load 100 ? -135 -90 -45 0 45 90 135 180 225 270 315 ( e s a h p )
may 2006 7 mic923 mic923 micrel, inc. time (100ns/div) small signal response inpu t (50mv/div) output (50mv/div) v = 5v a v = -1 c l = 1.7pf r l = 1m? r f = 1k ? time (100ns/div) small signal response inpu t (50mv/div) output (50mv/div) v = 9v a v = -1 c l = 1.7p f r l = 1m? r f = 1k ? small signal response input (50mv/div) output (50mv/div) time (100ns/div) v = 9v av = -1 c l = 100pf r l = 1m? r f = 1k? small signal response input (50mv/div) output (50mv/div) time (100ns/div) v = 5v av = -1 c l = 100pf r l = 1m? r f = 1k? small signal response time (100ns/div) input (50mv/div) output (50mv/div) v = 5v av = -1 c l = 1000pf r l = 1m? r f = 1k? small signal response input (50mv/div) output (50mv/div) time (100ns/div) v = 9v av = -1 c l = 1000pf r l = 1m? r f = 1k? functional characteristics
mic923 micrel, inc. mic923 8 may 2006 time (100ns/div) small signal response inpu t (50mv/div) outpu t (100mv/div ) v = 5v a v = 2 c l = 1.7pf r l = 1m? r f = 2k? time (100ns/div) small signal response inpu t (50mv/div) output (100mv/div ) v = 5v a v = 2 c l = 100pf r l = 1m? r f = 2k? time (100ns/div) small signal response inpu t (50mv/div) output (100mv/div ) v = 5v a v = 2 c l = 1000pf r l = 1m? r f = 2k? small signal response time (100ns/div) input (50mv/div) output (100mv/div) v = 9v av = 2 c l = 1.7p f r l = 1m? r f = 2k? time (100ns/div) small signal response inpu t (50mv/div) output (50mv/div) v = 9v a v = 2 c l = 100pf r l = 1m ? r f = 2k? time (100ns/div) small signal response inpu t (50mv/div) output (100mv/div ) v = 9v a v = 2 c l = 1000pf r l = 1m? r f = 2k?
may 2006 9 mic923 mic923 micrel, inc. time (10ns/div) large signal response output (1v/div) v = 5v a v = 2 c l = 1.7pf r l = 1m? r f = 2k? positive slew rate = 970v/ s negative slew rate = 720v/ s large signal response time (10ns/div) output (100mv/div) v = 9v av = 2 c l = 1.7pf r l = 1m? r f = 2k? positive slew rate = 2100v/s negative slew rate = 2200v/s time (25ns/div) large signal response output (100mv/div ) v = 5 v a v = 2 c l = 100pf r l = 1m? r f = 2k ? positive slew rate = 440v/ s negative slew rate = 340v/ s time (25ns/div) large signal response output (2v/div ) v = 5 v a v = 2 c l = 100pf r l = 1m? r f = 2k ? positive slew rate = 700v/ s negative slew rate = 500v/ s time (100ns/div) large signal response output (1v/div) v = 5v a v = 2 c l = 1000pf r l = 1m? r f = 2k? positive slew rate = 70v/ s negative slew rate = 45v/ s time (100ns/div) large signal response output (2v/div) v = 9v a v = 2 c l = 1000pf r l = 1m? r f = 2k? positive slew rate = 87v/ s negative slew rate = 57v/ s
mic923 micrel, inc. mic923 10 may 2006 applications information the mic923 is a high-speed, voltage-feedback operational ampli?er featuring very low supply current and excellent stability. this device is unity gain stable, capable of driving high capacitance loads. driving high capacitance the mic923 is stable when driving high capacitance, making it ideal for driving long coaxial cables or other high-capaci- tance loads. most high-speed op amps are only able to drive limited capacitance. note: increasing load capacitance does reduce the speed of the device. in applications where the load capacitance reduces the speed of the op amp to an unacceptable level, the effect of the load capacitance can be reduced by add - ing a small resistor (<100) in series with the output. feedback resistor selection conventional op amp gain con?gurations and resistor selec- tion apply, the mic923 is not a current feedback device. also, for minimum peaking, the feedback resistor should have low parasitic capacitance, usually 470 is ideal. to use the part as a follower, the output should be connected to input via a short wire. layout considerations all high speed devices require careful pcb layout. the follow - ing guidelines should be observed: capacitance, par-ticularly on the two inputs pins will degrade performance; avoid large copper traces to the inputs. keep the output signal away from the inputs and use a ground plane. it is important to ensure adequate supply bypassing capaci- tors are located close to the device. power supply bypassing regular supply bypassing techniques are recommended. a 10f capacitor in parallel with a 0.1f capacitor on both the positive and negative supplies are ideal. for best perfor- mance all bypassing capacitors should be located as close to the op amp as possible and all capacitors should be low esl (equivalent series inductance), esr (equivalent series resis-tance). surface-mount ceramic capacitors are ideal. thermal considerations the sc70-5 package, like all small packages, have a high thermal resistance. it is important to ensure the ic does not exceed the maximum operating junction (die) temperature of 85c. the part can be operated up to the absolute maximum temperature rating of 125c, but between 85c and 125c performance will degrade, in par-ticular cmrr will reduce. an mic923 with no load, dissipates power equal to the qui - escent supply current supply voltage p d (no load) = (v v+ C v v C )i s when a load is added, the additional power is dissipated in the output stage of the op amp. the power dissipated in the device is a function of supply voltage, output voltage and output current. p d (output stage) = (v v+ C v out )i out total power dissipation = p d (no load) + p d(output stage) ensure the total power dissipated in the device is no greater than the thermal capacity of the package. the sc70-5 pack - age has a thermal resistance of 450c/w. max. allowable power dissipation = t j(max) C t a(max) 450oc/w
may 2006 11 mic923 mic923 micrel, inc. package information sc70 (c5) micrel inc. 2180 fortune drive san jose, ca 95131 usa tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 web http://www.micrel.com this information furnished by micrel in this data sheet is believed to be accurate and reliable. however no responsibility is assumed by micrel for its use. micrel reserves the right to change circuitry and speci?cations at any time without noti?cation to the customer. micrel products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a signi? cant injury to the user. a purchaser's use or sale of micrel products for use in life support appliances, devices or systems is a purchaser's own risk and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 200 2 micrel , inc.

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