View EL2125CW-T13_2834523.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

el2125c ? ? caution: these devices are sensitive to electrosta tic discharge; follow proper ic handling procedures. 1-888-elantec or 408-945-1323 | intersil (and design) is a registered trademark of intersil americas inc. elantec ? is a registered trademark of elantec semiconductor, inc. copyright ? intersil americas inc. 2002. all rights reserved features ? voltage noise of only 0.83nv/ hz current noise of only 2.4pa/ hz 200v offset voltage 175mhz -3db bw for a v =10 low supply current - 10ma sot-23 package available 2.5v to 15v operation applications ultrasound input amplifiers wideband instrumentation communication equipment agc & pll active filters wideband sensors *el2125cw symbol is .fxxx where xxx represents date code ordering information part no package tape & reel outline # el2125cw-t7 5-pin sot-23* 7? mdp0038 EL2125CW-T13 5-pin sot-23* 13? mdp0038 el2125cs 8-pin so - mdp0027 el2125cs-t7 8-pin so 7? mdp0027 el2125cs-t13 8-pin so 13? mdp0027 general description the el2125c is an ultra-low noise, wideband amplifier that runs on half the supply current of competitiv e parts. it is intended for use in systems such as ultrasound imaging where a very small signal needs to be amplified by a large amount wit hout adding significant noise. its low power dissipation enables it to be packaged in the tiny sot-23 package, which further helps systems where many input channels cre- ate both space and power dissipation problems. the el2125c is stable for gains of 10 and greater and uses traditional voltage feedback. this allows the use of reactive elements in the feed- back loop, a common requirement for many filter topologies. it operates from 2.5v to 15v supplies and is available in the 5-pin sot-23 and 8-pin so packages. the el2125c is fabricated in elantec?s proprietary complementary bipolar process, and is specified for operation from -45c to +85c. connection diagrams 1 2 3 4 8 7 6 5 el2125cs (8-pin so) 1 2 3 5 4 el2125cw (5-pin sot-23) - + - + vs+ in- in+ vs- out nc in- in+ vs- nc vs+ out nc el2125c ultra-low noise, low power, wideband amplifier november 14, 2002
2 el2125c ultra-low noise, low power, wideband amplifier el2125c absolute maximum ratings (t a = 25c) v s + to v s - 33v continuous output current 40ma any input v s - - 0.3v to v s + + 0.3v power dissipation see curves operating temperature -45c to +85c storage temperature -60c to +150c maximum die junction temperature +150c important note: all parameters having min/max specifications are guaranteed. typ values are for information purposes only. unless otherwise not ed, all tests are at the specified temperature and are pulsed tests, therefore: t j = t c = t a electrical characteristics v s = 5v, t a = 25c, r f = 180 ? , r g = 20 ? , r l = 500 ? unless otherwise specified. parameter description conditions min typ max unit dc performance v os input offset voltage (so8) 0.2 2 mv input offset voltage (sot23-5) 3mv t cvos offset voltage temperature coefficient 1.8 v/c i b input bias current -30 -22 a i os input bias current offset 0.4 2 a t cib input bias current temperature coefficient 0.09 a/c c in input capacitance 2.2 pf a vol open loop gain 80 87 db psrr power supply rejection ratio [1] 80 97 db cmrr common mode rejection ratio at cmir 80 106 db cmir common mode input range -4.6 3.8 v v outh output voltage swing high no load, r f = 1k ? 3.5 3.65 v v outl output voltage swing low no load, r f = 1k ? -3.87 -3.7 v v outh2 output voltage swing high r l = 100 ? 33.3 v v outl2 output voltage swing low r l = 100 ? -3.5 -3 v i out output short circuit current [2] 80 100 ma i s supply current 10.1 11 ma ac performance - r g = 20 ? , c l = 5pf bw -3db bandwidth 175 mhz bw 0.1db 0.1db bandwidth 34 mhz bw 1db 1db bandwidth 150 mhz peaking peaking 0.4 db sr slew rate v out = 2v pp , measured at 20% to 80% 150 185 v/s os overshoot, 4vpk-pk output square wave positive 0.6 % negative 2.7 % t s settling time to 0.1% of 1v pulse 42 ns v n voltage noise spectral density 0.83 nv/ hz i n current noise spectral density 2.4 pa/ hz hd2 2nd harmonic distortion [3] -74 dbc hd3 3rd harmonic distortion [4] -91 dbc 1. measured by moving the supplies from 4v to 6v 2. pulse test only 3. frequency = 1mhz, v out = 2vpk-pk, into 500 ? and 5pf load
3 el2125c ultra-low noise, low power, wideband amplifier el2125c electrical characteristics v s = 15v, t a = 25c, r f = 180 ? , r g = 20 ? , r l = 500 ? unless otherwise specified. parameter description conditions min typ max unit dc performance v os input offset voltage (so8) 0.6 3 mv input offset voltage (sot23-5) 3mv t cvos offset voltage temperature coefficient 4.9 v/c i b input bias current -30 -24 a i os input bias current offset 0.4 2 a t cib input bias current temperature coefficient 0.08 a/c c in input capacitance 2.2 pf a vol open loop gain 80 87 db psrr power supply rejection ratio [1] 80 97 db cmrr common mode rejection ratio at cmir 75 105 db cmir common mode input range -14.6 13.8 v v outh output voltage swing high no load, r f = 1k ? 13.35 13.5 v v outl output voltage swing low no load, r f = 1k ? -13.6 -13 v v outh2 output voltage swing high r l = 100 ? 11 11.6 v v outl2 output voltage swing low r l = 100 ? -10.4 -9.8 v i out output short circuit current [2] 120 250 ma i s supply current 10.8 12 ma ac performance - r g = 20 ? , c l = 5pf bw -3db bandwidth 220 mhz bw 0.1db 0.1db bandwidth 23 mhz bw 1db 1db bandwidth 63 mhz peaking peaking 2.5 db sr slew rate v out = 2v pp , measured at 20% to 80% 180 225 v/s os overshoot, 4vpk-pk output square wave 0.6 % t s settling time to 0.1% of 1v pulse 38 ns v n voltage noise spectral density 0.95 nv/ hz i n current noise spectral density 2.1 pa/ hz hd2 2nd harmonic distortion [3] -73 dbc hd3 3rd harmonic distortion [4] -96 dbc 1. measured by moving the supplies from 13.5v to 16.5v 2. pulse test only 3. frequency = 1mhz, v out = 2vpk-pk, into 500 ? and 5pf load
4 el2125c ultra-low noise, low power, wideband amplifier el2125c typical performance curves non-inverting frequency response for various r f 5 -5 1m 10m 100m frequency (hz) normalized gain (db) inverting frequency response for various r f 6 2 -2 -6 -10 -14 1m 10m 100m 300m frequency (hz) normalized gain (db) inverting frequency response for various r f 6 2 -2 -6 -10 -14 1m 10m 100m 300m frequency (hz) normalized gain (db) non-inverting frequency response for various r f 5 0 -5 1m 10m 100m frequency (hz) normalized gain (db) 0 r f =1k ? r f =499 ? r f =180 ? r f =100 ? r f =1k ? r f =180 ? r f =700 ? r f =100 ? r f =499 ? v s =5v a v =-10 r l =560 ? c l =5pf r f =1k ? r f =350 ? r f =200 ? r f =97.6 ? r f =499 ? r f =1k ? r f =350 ? r f =200 ? r f =499 ? r f =97.6 ? v s =5v a v =10 r l =500 ? c l =5pf v s =15v a v =10 r l =500 ? c l =5pf -5 0 5 1m 10m 100m 200m frequency (hz) normalized gain (db) non-inverting frequency response vs gain v s =5v r l =500 ? c l =5pf r g =20 ? -5 0 5 normalized gain (db) non-inverting frequency response for various gain v s =15v r l =500 ? c l =5pf r f =700 ? 1m 10m 100m 200m frequency (hz) 200m 300m a v =50 a v =20 a v =10 a v =50 a v =20 a v =10 v s =15v a v =-10 r l =500 ? c l =5pf
5 el2125c ultra-low noise, low power, wideband amplifier el2125c typical performance curves 6 normalized gain (db) inverting frequency response vs gain 2 -2 -6 -10 -14 0 6 normalized gain (db) inverting frequency response vs gain 1m 10m 100m 300m frequency (hz) -14 a v =-10 a v =-50 a v =-20 1m 10m 100m 300m frequency (hz) a v =-50 a v =-20 a v =-10 v s =15v r l =500 ? c l =5pf r g =50 ? -5 5 normalized gain (db) non-inverting frequency response for various output signal levels 0 -14 6 normalized gain (db) inverting frequency response for various output signal levels 0 1m 10m 100m 200m frequency (hz) v s =5v a v =10 r f =180 ? r l = 500 ? c l =5pf 2v pp 4v pp 30mv pp 500mv pp 1v pp 1m 10m 100m 300m frequency (hz) v s =5v a v =-10 r f =350 ? r l = 500 ? c l =5pf 2.5v pp 500mv pp 3.3v pp 250mv pp 3mv pp 5 normalized gain (db) non-inverting frequency response for various c l 3 1 -1 -3 0 5 normalized gain (db) non-inverting frequency response for various c l -5 1m 10m 100m 200m frequency (hz) v s =5v a v =10 r f =180 ? r l =500 ? -5 1m 10m 100m 200m frequency (hz) v s =5v a v =10 r f =700 ? r l =500 ? 1v pp c l =28.5pf c l =16pf c l =5pf c l =1pf c l =17pf c l =11pf c l =1.2pf c l =5pf v s =5v r l =500 ? c l =5pf r g =35 ?
6 el2125c ultra-low noise, low power, wideband amplifier el2125c typical performance curves 6 normalized gain (db) inverting frequency response for various c l 0 6 normalized gain (db) inverting frequency response for various c l 2 -2 -6 -10 1m 10m 100m 300m frequency (hz) -14 c l =29.4pf c l =16.4pf c l =11.4pf c l =5.1pf c l =1.2pf v s =5v a v =10 r f =350 ? r l =500 ? -14 1m 10m 100m 300m frequency (hz) c l =29.4pf c l =16.4pf c l =11.4pf c l =5.1pf c l =1.2pf v s =15v a v =10 r f =500 ? r l =500 ? open loop gain (db) 0 40 20 10k open loop gain and phase 10m 60 80 100 100k 100m frequency (hz) 1m phase () -250 -50 -150 50 150 250 0 0 supply voltage (v) supply current (ma) supply current vs supply voltage 4.8 12 2.4 31215 9.6 7.2 69 peaking vs supply voltage 3 2.5 2 1.5 1 0.5 0 2 4 6 8 10 12 14 16 v s (v) peaking (db) a v =10 a v =-10 a v =50 a v =-50 a v =20 a v =-20 3db bandwidth vs supply voltage 250 200 150 100 50 0 2 4 6 8 10 12 14 16 v s (v) bandwidth (mhz) a v =10 a v =-10 a v =50 a v =-50 a v =20 a v =-20 400m gain phase v s =5v
7 el2125c ultra-low noise, low power, wideband amplifier el2125c typical performance curves 10ns/div 20mv/div small signal step response small signal step response v in x2 v o v s =5v r l =500 ? r f =180 ? a v =10 c l =5pf 10ns/div 20mv/div v in x2 v o v s =15v r l =500 ? r f =180 ? a v =10 c l =5pf time (20ns/div) output voltage (0.5v/div) large-signal step response v s =5v r l =500 ? r f =180 ? a v =10 c l =5pf time (20ns/div) output voltage (0.5v/div) large-signal step response v s =15v r l =500 ? r f =180 ? a v =10 c l =5pf 1mhz harmonic distortion vs output swing -40 -50 -60 -70 -90 -100 -110 067 v out (v pp ) distortion (dbc) 1mhz harmonic distortion vs output swing -30 -40 -60 -80 -90 -100 -110 05 25 v out (v pp ) distortion (dbc) 45 23 1 -80 v s =5v r f =180 ? a v =10 r l =500 ? 2nd hd 3rd hd v s =15v r f =180 ? a v =10 r l =500 ? 10 15 20 -50 -70 2nd hd 3rd hd
8 el2125c ultra-low noise, low power, wideband amplifier el2125c typical performance curves voltage and current noise vs frequency 100 10 1 0.1 10 100 1k 10k 100k frequency (hz) voltage noise (nv/ hz), current noise (pa/ hz) v n , v s =15v i n , v s =5v i n , v s =15v v n , v s =5v settling time vs accuracy 60 50 40 30 20 10 0 0.1 1 10 accuracy (%) settling time (ns) v s =15v v o =5v pp v s =5v v o =5v pp v s =15v v o =2v pp v s =5v v o =2v pp total harmonic distortion vs frequency -30 -60 -80 -90 1k 10k 100m frequency (hz) thd (dbc) v s =5v v o =2v pp a v =10 r f =180 ? r l =500 ? 100k 1m 10m -40 -50 -70 -6 14 1 400 frequency (mhz) group delay (ns) group delay 2 10 6 -2 10 100 a v =20 a v =10 v s =15v -110 -10 10 100m frequency (hz) cmrr (db) cmrr -70 -30 -50 -99 100 10m 1k 10k 100k 1m psrr (db) 10 50 30 10k psrr 10m 70 90 110 100k 100m frequency (hz) 1m psrr- psrr+ 600m
9 el2125c ultra-low noise, low power, wideband amplifier el2125c typical performance curves bandwidth vs temperature 200 160 40 0 -40 160 temperature (c) -3db bandwidth (mhz) 120 80 80 0 40 120 3.5 3 2.5 1.5 2 1 0.5 0 peaking (db) bandwidth peaking r out ( ? ) 0.001 0.1 0.01 10k closed loop output impedance vs frequency 1 10 100 frequency (hz) 100m 100k 1m 10m slew rate (v/s) 100 200 150 0 slew rate vs swing 250 300 350 v out swing (v pp ) 20 51015 5v sr - 15v sr + 15v sr - 5v sr + 13 12 11 9 10 0 -1 -2 -3 supply current vs temperature -50 0 100 150 50 die temperature (c) i s (ma) v s =5v v s =15v offset voltage vs temperature -50 0 100 150 50 die temperature (c) v s =5v v s =15v v os (mv) input bias current vs temperature -50 0 100 150 50 die temperature (c) i b + (a) -10 -15 -20 -25 -30
10 el2125c ultra-low noise, low power, wideband amplifier el2125c typical performance curves 120 100 80 60 110 100 90 80 cmrr vs temperature -50 0 100 150 50 die temperature (c) cmrr (db) v s =5v v s =15v psrr vs temperature -50 0 100 150 50 die temperature (c) psrr (db) v s =5v v s =15v 240 220 200 180 160 slew rate vs temperature -50 0 100 150 50 die temperature (c) sr (v/s) v s =5v v s =15v v o =2v pp 3.9 3.7 3.6 3.5 3.8 positive output swing vs temperature -50 die temperature (c) v outh (v) 0 100 150 50 v s =5v 13.6 13.5 13.4 -9.75 -9.8 -9.85 -9.9 -9.95 positive output swing vs temperature -50 die temperature (c) 0 100 150 50 v outh (v) v s =15v negative output swing vs temperature -50 die temperature (c) v outl (v) 0 100 50 v s =5v
11 el2125c ultra-low noise, low power, wideband amplifier el2125c typical performance curves -13.4 -13.5 -13.6 -13.7 -3.42 -3.44 -3.46 -3.48 -3.5 -3.52 -9.6 -9.8 -10 -10.2 -10.4 -10.6 -10.8 negative output swing vs temperature -50 die temperature (c) v outl (v) 0 100 150 50 v s =15v loaded negative output swing vs temperature -50 die temperature (c) v outl2 (v) 0 100 150 50 v s =5v negative output swing vs temperature -50 die temperature (c) v outl2 (v) 0 100 150 50 v s =15v 3.35 3.3 3.25 12 11.8 11.6 11.4 11.2 11 loaded positive output swing vs temperature -50 die temperature (c) v outh2 (v) 0 100 150 50 v s =5v loaded positive output swing vs temperature -50 die temperature (c) v outh2 (v) 0 100 150 50 v s =15v 1.2 0.6 0 package power dissipation vs ambient temperature jedec jesd51-3 low effective thermal conductivity test board 0 ambient temperature (c) power dissipation (w) 25 125 150 75 1 0.4 0.8 0.2 100 50 85 488mw 781mw j a = 1 6 0 c / w s o 8 j a = 2 5 6 c / w s o t 2 3 - 5
12 el2125c ultra-low noise, low power, wideband amplifier el2125c typical performance curves 1.8 0.8 0 1.6 0.4 1.2 0.2 0.6 1.4 1 package power dissipation vs ambient temperature jedec jesd51-7 high effective thermal conductivity test board 0 ambient temperature (c) power dissipation (w) 25 125 150 75 100 50 85 543mw j a = 1 1 0 c / w s o 8 1.136w j a = 2 3 0 c / w s o t 2 3 - 5
13 el2125c ultra-low noise, low power, wideband amplifier el2125c pin descriptions el2125cw (5-pin sot-23) el2125cs (8-pin so) pin name pin function equivalent circuit 1 6 vout output circuit 1 2 4 vs- supply 3 3 vina+ input circuit 2 4 2 vina- input reference circuit 2 5 7 vs+ supply v out v s + v in - v in + v s + v s -
14 el2125c ultra-low noise, low power, wideband amplifier el2125c applications information product description the el2125c is an ultra-low noise, wideband mono- lithic operational amplifier built on elantec's proprietary high speed complementary bipolar process. it features 0.83nv/ hz input voltage noise, 200v offset voltage, and 73db thd. it is intended for use in systems such as ultrasound imaging where very small signals are needed to be amplified. the el2125c also has excellent dc specifications: 200v v os , 22a ib, 0.4a i os , and 106db cmrr. these specifications allow the el2125c to be used in dc-sensitive applications such as differ- ence amplifiers. gain-bandwidth product the el2125c has a gain-bandwidth product of 800mhz at 5v. for gains greater than 20, its closed-loop -3db bandwidth is approximately equal to the gain-bandwidth product divided by the small signal gain of the circuit. for gains less than 20, higher-order poles in the ampli- fier's transfer function contribute to even higher closed- loop bandwidths. for example, the el2125c has a -3db bandwidth of 175mhz at a gain of 10 and decreases to 40mhz at gain of 20. it is important to note that the extra bandwidth at lower gain does not come at the expenses of stability. even though the el2125c is designed for gain > 10 with external compensation, the device can also operate at lower gain settings. the rc network shown in figure 1 reduces the feedback gain at high fre- quency and thus maintains the amplifier stability. r values must be less than rf divided by 9 and 1 divided by 2 rc must be less than 400mhz. choice of feedback resistor, rf the feedback resistor forms a pole with the input capac- itance. as this pole becomes larger, phase margin is reduced. this increases ringing in the time domain and peaking in the frequency domain. therefore, rf has some maximum value which should not be exceeded for optimum performance. if a large value of rf must be used, a small capacitor in the few pf range in parallel with rf can help to reduce this ringing and peaking at the expense of reducing the bandwidth. frequency response curves for various rf values are shown the in typical performance curves section of this data sheet. noise calculations the primary application for the el2125c is to amplify very small signals. to maintain the proper signal-to- noise ratio, it is essential to minimize noise contribution from the amplifier. figure 2 below shows all the noise sources for all the components around the amplifier. v n is the amplifier input voltage noise i n + is the amplifier positive input current noise i n - is the amplifier negative input current noise v rx is the thermal noise associated with each resistor: where: - k is boltzmann's constant = 1.380658 x 10 -23 - t is temperature in degrees kelvin (273+ c) - + r f r c v in v out figure 1. - + v on v in i n + i n - r 2 r 3 r 1 v n v r3 v r2 v r1 figure 2. v rx 4 ktrx =
15 el2125c ultra-low noise, low power, wideband amplifier el2125c the total noise due to the amplifier seen at the output of the amplifier can be calculated by using the following equation: as the above equation shows, to keep noise at a mini- mum, small resistor values should be used. at higher amplifier gain configuration where r 2 is reduced, the noise due to in-, r 2 , and r 1 decreases and the noise caused by in+, vn, and r 3 starts to dominate. because noise is summed in a root -mean-squares method, noise sources smaller than 25% of the largest noise source can be ignored. this can greatly simplify the formula and make noise calculation much easier to calculate. output drive capability the el2125c is designed to drive low impedance load. it can easily drive 6v p-p signal into a 100 ? load. this high output drive capability makes the el2125c an ideal choice for rf, if, and video applications. further- more, the el2125c is current-limited at the output, allowing it to withstand momentary short to ground. however, the power dissipation with output-shorted cannot exceed the power dissipation capability of the package. driving cables and capacitive loads although the el2125c is designed to drive low imped- ance load, capacitive loads will decreases the amplifier's phase margin. as shown the in the performance curves, capacitive load can result in peaking, overshoot and pos- sible oscillation. for optimum ac performance, capacitive loads should be reduced as much as possible or isolated with a series resistor between 5 ? to 20 ? . when driving coaxial cables, double termination is always recommended for reflection-free performance. when properly terminated, the capacitance of the coax- ial cable will not add to the capacitive load seen by the amplifier. power supply bypassing and printed circuit board layout as with any high frequency devices, good printed circuit board layout is essential for optimum performance. ground plane construction is highly recommended. lead lengths should be kept as short as possible. the power supply pins must be closely bypassed to reduce the risk of oscillation. the combination of a 4.7f tanta- lum capacitor in parallel with 0.1f ceramic capacitor has been proven to work well when placed at each sup- ply pin. for single supply operation, where pin 4 (v s -) is connected to the ground plan e, a single 4.7f tantalum capacitor in parallel with a 0.1f ceramic capacitor across pins 7 (v s +) and pin 4 (v s -) will suffice. for good ac performance, parasitic capacitance should be kept to a minimum. ground plane construction again should be used. small chip resistors are recommended to minimize series inductance. use of sockets should be avoided since they add parasitic inductance and capaci- tance which will result in additional peaking and overshoot. supply voltage range and single supply operation the el2125c has been designed to operate with supply voltage range of 2.5v to 15v. with a single supply, the el2125c will operate from +5v to +30v. pins 4 and 7 are the power supply pins. the positive power supply is connected to pin 7. when used in single supply mode, pin 4 is connected to ground. when used in dual supply mode, the negative power supply is connected to pin 4. as the power supply voltage decreases from +30v to +5v, it becomes necessary to pay special attention to the input voltage range. the el2125c has an input voltage range of 0.4v from the negative supply to 1.2v from the positive supply. so, for example, on a single +5v sup- ply, the el2125c has an input voltage range which spans from 0.4v to 3.8v. the output range of the el2125c is also quite large, on a +5v supply, it swings from 0.4v to 3.6v. v on bw = vn 2 1 r 1 r 2 ----- - + ?? ?? ?? 2 in - 2 r 1 2 in + 2 r 3 2 1 r 1 r 2 ----- - + ?? ?? ?? 2 + 4 ktr 1 4 ktr 2 r 1 r 2 ----- - ?? ?? ?? 2 + 4 ktr 3 1 r 1 r 2 ----- - + ?? ?? ?? 2 ++ + ? ? ? ? ? ?
intersil europe sarl avenue william fraisse 3 1006 lausanne switzerland tel: +41-21-6140560 fax: +41-21-6140579 europe 16 el2125c ultra-low noise, low power, wideband amplifier el2125c all intersil u.s. products are m anufactured, assembled and tested utilizing iso9000 quality systems. intersil corporation?s quality certifications can be viewed at www.intersil.com/design/quality intersil products are sold by description only. intersil corporation reserves the right to make changes in circuit design, soft ware and/or specifications at any time without notice. accordingly, the reader is cautioned to verify that data sheets are current before placing orders. information furnished by intersil is believed to be accurate and reliable. however, no responsibility is assumed by intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. no license is granted by implication o r otherwise under any patent or patent rights of intersil or its subsidiaries. for information regarding intersil corpor ation and its products, see www.intersil.com november 14, 2002 printed in u.s.a. ? intersil corporation 7585 irvine center drive suite 100 irvine, ca 92618 tel: 949-341-7000 fax: 949-341-7123 north america intersil corporation unit 1804 18/f guangdong water bldg. 83 austin road tst, kowloon hong kong tel: +852-2723-6339 fax: +852-2730-1433 asia elantec 675 trade zone blvd. milpitas, ca 95035 tel: 408-945-1323 800: 888-elantec fax: 408-945-9305 sales office headquarters effective may 15, 2002, elantec, a leader in high performanc e analog products, is now a part of intersil corporation.

▲Up To Search▲

Price & Availability of EL2125CW-T13

	To Download EL2125CW-T13 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .