december 1998 1 MIC7201 MIC7201 micrel MIC7201 gainblock difference amplifier final information general description the MIC7201 difference amplifier is an analog gain block designed to convert a differential signal to a signal-ended signal. it features an extended common-mode range that includes rail-to-rail input/output capabilities. the part is pack- aged in the sot-23-5 ittybitty package. the MIC7201 is designed using the mic7101 operational amplifier plus well-matched monolithic resistors to provide a unity-gain stable differential input to signal-ended output amplifier that requires a minimum of external components. performance is guaranteed from 2.2v through 10v. features operates from 2.2v to 10v 1% typical gain error 0.6ma typical supply current at 2.2v 400khz bandwidth small sot-23-5 package suitable for driving capacitive loads applications cellular telephones digital audio systems mobile communications portable computers and pdas ordering information part number temperature range package MIC7201bm5 ?0 c to +85 c sot-23-5 other voltages available. contact micrel for details. gainblock is a trademark of micrel, inc. block diagram in+ out 50k 100k v+ 50k 50k 100k in v MIC7201 1 2 3 4 5 difference amplifier behavior the desired 100mv, 400hz differential sinusoidal signal is shown applied to inputs v in and v in+ . a 500mv, 5khz square-wave noise signal is super- imposed on both v in and v in+ . these signals demonstrate the noise cancellation ability of the MIC7201. the output (v out ) shows the recovered single-ended 200mv peak-to-peak, 400hz sine wave. v in v in+ v out micrel, inc. 1849 fortune drive san jose, ca 95131 usa tel + 1 (408) 944-0800 fax + 1 (408) 944-0970 http://www.micrel.com
MIC7201 micrel MIC7201 2 december 1998 pin configuration out v+ in in+ 1 3 45 2 v a16 part identification sot-23-5 pin description pin number pin name pin function 1 out amplifier output: single-ended output. 2 v+ positive supply: positive power supply input. 3 in+ noniverting input: in-phase differential input. 4in inverting input: out-of-phase differential input. 5v ground: power supply ground return.
december 1998 3 MIC7201 MIC7201 micrel absolute maximum ratings (note 1) supply voltage (v v+ v v ) ............................................. 12v differential input voltage (v v+ v v ) ................. (v v+ v v ) i/o pin voltage (v in , v out ), note 2 ................................................ v v 0.3v to v v+ +0.3v junction temperature (t j ) ...................................... +150 c storage temperature (t s ) ....................... 65 c to +150 c lead temperature (soldering, 10 sec.) ..................... 260 c esd, note 5 .................................................................. 2kv operating ratings (note 1) supply voltage (v v+ v v ) ............................ +2.2v to +10v input voltage (v in+ , v in ) ................................... v v to v v+ continuous output current ...................................... 15ma junction temperature (t j ) ......................... 40 c to +85 c max. junction temperature (t j(max) ), note 3 ........... +85 c package thermal resistance ( ja ), note 4 .......... 325 c/w max. power dissipation ............................................ note 3 electrical characteristics (2.2v) v v+ = 2.2v, v v = 0v, v cm = v out = v+/2; r l = 1m ? ; t j = 25 c, bold values indicate 40 c t j +85 c; unless noted symbol parameter condition min typ max units e z zero error e z = ? v out v v+ /2 ? 944mv tcv os input offset voltage temp. drift 14 v/ c r in input resistance 35 50 65 k ? cmrr common-mode rejection ratio v cm = 0v to v v+ 65 db psrr split-supply rejection ratio v v+ = ? v v ? = 1.1v to 2.5v, 50 db v cm = 0v +psrr single-supply rejection ratio, v v+ = 2.2v to 5v, v v = 0v, v cm = 1.1v 6 db note 8 e g gain error, note 9 0.2v v out 2.0v 1% v out output voltage swing output high, r l = 2k, 10 33 mv note 10 specified as v v+ v out 50 mv output low, r l = 2k 10 33 mv 50 mv output high, r l = 600 ? ,33mv specified as v v+ v out mv output low, r l = 600 ? 33 mv mv i sc output short-circuit current sinking or sourcing, note 6 , note 7 20 60 ma bw bandwidth 3db point 400 khz sr slew rate 0.5 v/ s thd total harmonic distortion f = 1khz 0.02 % f = 10khz 0.02 % e n input referred voltage noise f = 1khz 30 nv hz / i s supply current no load 0.6 2.0 ma
MIC7201 micrel MIC7201 4 december 1998 electrical characteristics (5v) v v+ = +5v, v v = 0v, v cm = v out = v+/2; r l = 1m ? ; t j = 25 c, bold values indicate 40 c t j +85 c; unless noted symbol parameter condition min typ max units e z zero error e z = ? v out v v+ /2 ? 26 100 mv tcv os input offset voltage temp. drift 14 v/ c r in input resistance 35 50 65 k ? cmrr common-mode rejection ratio v cm = 0v to v v+ 65 db psrr split-supply rejection ratio v v+ = ? v v ? = 2.5v to 5v, 50 db v cm = 0v +psrr single-supply rejection ratio, v v+ = 5v to 10v, v v = 0v, v cm = 2.5v 6 db note 8 e g gain error, note 9 0.5v v out 4.5v 1% v out output voltage swing output high, r l = 2k, 15 50 mv note 10 specified as v v+ v out 75 mv output low, r l = 2k 15 50 mv 75 mv output high, r l = 600 ? ,50mv specified as v v+ v out mv output low, r l = 600 ? 50 mv mv i sc output short-circuit current sinking or sourcing, note 6 , note 7 40 110 ma bw bandwidth 3db point 250 khz sr slew rate 0.5 v/ s thd total harmonic distortion f = 1khz 0.02 % f = 10khz 0.02 % e n input referred voltage noise f = 1khz 30 nv hz / i s supply current no load 0.8 2.8 ma electrical characteristics (10v) v v+ = 10v, v v = 0v, v cm = v out = v+/2; r l = 1m ? ; t j = 25 c, bold values indicate 40 c t j +85 c; unless noted symbol parameter condition min typ max units e z zero error e z = ? v out v v+ /2 ? 60 200 mv tcv os input offset voltage temp. drift 14 v/ c r in input resistance 35 50 65 k ? cmrr common-mode rejection ratio v cm = 0v to v v+ 65 db psrr split-supply rejection ratio v v+ = ? v v ? = 2.5v to 5v, 50 db v cm = 0v +psrr single-supply rejection ratio, v v+ = 5v to 10v, v v = 0v, v cm = 2.5v 6 db note 8 e g gain error, note 9 0.5v v out 9.5v 1%
december 1998 5 MIC7201 MIC7201 micrel symbol parameter condition min typ max units v out output voltage swing output high, r l = 2k, 24 80 mv note 10 specified as v v+ v out 120 mv output low, r l = 2k 24 80 mv 120 mv output high, r l = 600 ? ,80mv specified as v v+ v out mv output low, r l = 600 ? 80 mv mv i sc output short-circuit current sinking or sourcing, note 6 , note 7 40 200 ma bw bandwidth 3db point 250 khz sr slew rate 0.5 v/ s thd total harmonic distortion f = 1khz 0.02 % f = 10khz 0.02 % e n input referred voltage noise f = 1khz 30 nv hz / i s supply current no load 1.2 4.0 ma internal op amp typical characteristics +2.2v v v+ 10v, v v = 0v, v cm = v out = v+/2; r l = 1m ? ; t j = 25 c, bold values indicate 40 c t j +85 c; unless noted symbol parameter condition min typ max units v os input offset voltage 0.11 mv tcv os input offset voltage drift 1.0 v/ c i b input bias current 1.0 pa i os input offset current 0.5 pa r in input resistance >1 t ? cmrr common-mode rejection ratio 0v v cm v v+ 80 db v cm input common-mode voltage input low 0.3 v input high v v+ +0.3 v psrr power supply rejection ratio v v+ = ? v v ? = 1.1v to 1.65v, 60 db v cm = 0v general note: devices are esd protected; however, handling precautions are recommended. all limits guaranteed by testing or statistical analy sis. note 1: absolute maximum ratings indicate limits beyond which damage to the component may occur. electrical specifications do not apply when operating the device outside its recommended operating ratings. note 2: i/o pin voltage is any external voltage to which an input or output is referenced. note 3: the maximum allowable power dissipation is a function of the maximum junction temperature, t j(max) ; the junction-to-ambient thermal resistance, ja ; and the ambient temperature, t a . the maximum allowable power dissipation at any ambient temperature is calculated using: p d = (t j(max) t a ) / ja . exceeding the maximum allowable power dissipation will result in excessive die temperature. note 4: thermal resistance, ja , applies to a part soldered on a printed-circuit board. note 5: human body model, 1.5k in series with 100pf. note 6: short circuit may cause the device to exceed maximum allowable power dissipation. see note 3 . note 7: shorting v out to v+ when v+ > 10v may damage the device. note 8: limited by internal bias-network resistors. power supply must be clean. power supply should be bypassed as shown in typical application circuit. note 9: the gain error specification applies to differential, inverting, and noninverting gains. note 10: since the part is specified in a single-supply configuration, the output load (r l ) is a thevenin equivalent value. the actual load consists of 2 r l to ground and 2 r l to the supply (v+).
MIC7201 micrel MIC7201 6 december 1998 applications information input common mode voltage the MIC7201 tolerates overdriving the inputs by at least 300mv beyond either rail without producing phase inversion. if the absolute maximum input voltage is exceeded, the input current should be limited to 5ma to prevent reducing reliabil- ity. a 10k ? series input resistor, used as a current limiter will protect the input structure from voltages as large as 50v above the supply or below ground. output voltage swing output resistance of the MIC7201 is symmetric; sink and source output resistances are equal. output voltage swing is determined by the load and, given the approximate output resistance, which may be readily calculated with the following formula: r v i out drop load v drop is the voltage dropped within the amplifier output stage. v drop and i load can be determined from the v out (output swing) portion of the appropriate electrical character- istics table. i load is equal to the typical output high voltage minus v+/2 and divided by r load . for example, using the electrical characteristics dc (5v) table, the typical output voltage drop using a 2k ? load (connected to v+/2) is 0.015v, which produces an i load of (2.5v 0.015v) / 2k ? 1.243ma. then: r 15mv 1.243ma 1 out == 12 1 2 . ? driving capacitive loads driving a capacitive load introduces phase-lag into the output signal, and this in turn reduces system phase margin. the application that is least forgiving of reduced phase margin is a unity gain amplifier. the MIC7201 typically can drive a 500pf capacitive load connected directly to its output. v supply dac 0.1f 0.1f i out i out digital input 0.1f r l 0.1f v out 4.7f MIC7201 figure 1. audio dac in+ out 50k 100k v+ 50k 50k 100k in v MIC7201 1 2 3 4 5 v in v v+ v v 2 out in = figure 2. gain of one-half in+ out 50k 100k v+ 50k 50k 100k in v MIC7201 1 2 3 4 5 v in v v+ v out = v in v v+ 2 figure 3. voltage follower in+ out 50k 100k v+ 50k 50k 100k in v MIC7201 1 2 3 4 5 v v+ v out = v in 0.1f v in figure 4. inverting unity gain in+ out 50k 100k v+ 50k 50k 100k in v MIC7201 1 2 3 4 5 v v+ 0.1f v v 2 out v+ = figure 5. virtual ground generator
december 1998 7 MIC7201 MIC7201 micrel package information 0.20 (0.008) 0.09 (0.004) 0.60 (0.024) 0.10 (0.004) 3.02 (0.119) 2.80 (0.110) 10 0 3.00 (0.118) 2.60 (0.102) 1.75 (0.069) 1.50 (0.059) 0.95 (0.037) ref 1.30 (0.051) 0.90 (0.035) 0.15 (0.006) 0.00 (0.000) dimensions: mm (inch) 0.50 (0.020) 0.35 (0.014) 1.90 (0.075) ref sot-23-5 (m5)
MIC7201 micrel MIC7201 8 december 1998 micrel inc. 1849 fortune drive san jose, ca 95131 usa tel + 1 (408) 944-0800 fax + 1 (408) 944-0970 web http://www.micrel.com this information is believed to be accurate and reliable, however no responsibility is assumed by micrel for its use nor for an y infringement of patents or other rights of third parties resulting from its use. no license is granted by implication or otherwise under any patent or pat ent right of micrel inc. ? 1998 micrel incorporated
|
