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1 for more information www.linear.com/ltc6253-7 typical application description 2ghz, 3.5ma gain of 7 stable rail-to-rail i/o dual op amp the lt c ? 6253-7 is a dual high speed, low power, rail-to- rail input/output operational amplifier. on only 3.5ma of supply current, it features a 2ghz gain-bandwidth product, 500v/s slew rate and a low 2.75nv/hz of input-referred noise. the combination of high bandwidth, high slew rate, low power consumption and low broadband noise makes the ltc6253 -7 ideal for lower supply voltage, high speed signal conditioning systems. the device is stable for closed loop noise gains of 7 or higher. the ltc6253 -7 maintains high efficiency performance from supply voltage levels of 2.5v to 5.25v and is fully specified at supplies of 2.7v and 5.0v. for applications that require power-down, the ltc6253-7 offers a shutdown pin which disables the amplifier and reduces current consumption to 42a. the ltc6253 -7 can be used as a plug-in replacement for many commercially available op amps to reduce power or to improve input/output range and performance. l , lt, ltc, ltm, linear technology and the linear logo are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners. features applications n gain bandwidth product: 2ghz n C3db frequency (a v = 7): 160mhz n low quiescent current: 3.5ma max n high slew rate: 500v/s n input common mode range includes both rails n output swings rail-to-rail n low broadband voltage noise: 2.75nv /hz n fast output recovery n supply voltage range: 2.5v to 5.25v n input offset voltage: 350 v max n large output current: 90ma n cmrr: 105db n open loop gain: 60v/mv n operating temperature range: C 40c to 125c n ms10 package with independent shutdown pins n low voltage, high frequency signal processing n driving a/d converters n rail-to-rail buffer amplifiers n active filters n battery powered equipment adc driver with gain ltc6253C7 driving ltc2314C14 1024 point fft 2.2f 5v 2.2f cs cs sck sck sdo sdo gnd 625234 ta01 a in 47pf 100 v in = 0v to 580mv v dd ref ltc2314-14 8-pin tsot ov dd 3.3v 200 2.2f 4.4v ?0.7v ? + ? ltc6253-7 1.21k out v ? v + ltc6253-7 62537f 500 600 700 800 900 1000 ?130 ?120 ?110 ?100 f s = 2msps ?90 ?80 ?70 ?60 ?50 ?40 ?30 ?20 ?10 0 f1 = 20.5khz f1 amplitude = ?0.916dbfs sfdr = 89db snr = 72db amplitude (dbfs) 62537 ta01b frequency (khz) 0 100 200 300 400
2 for more information www.linear.com/ltc6253-7 (v s = 5v) the l denotes the specifications which apply across the specified temperature range, otherwise specifications are at t a = 25c. for each amplifier v s = 5v, 0v; v shdn = 2v; v cm = v out = 2.5v, unless otherwise noted. absolute maximum ratings order information electrical characteristics lead free finish tape and reel part marking* package description specified temperature range ltc6253ims-7#pbf ltc6253ims-7#trpbf ltgws 10-lead plastic msop C40c to 85c ltc6253hms-7#pbf ltc6253hms-7#trpbf ltgws 10-lead plastic msop C40c to 125c *temperature grades are identified by a label on the shipping container. consult ltc marketing for parts specified with wider operating temperature ranges. for more information on lead free part marking, go to: http://www.linear.com/leadfree/ for more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. some packages are available in 500 unit reels through designated sales channels with #trmpbf suffix. total supply voltage (v + to v C ) ................................ 5. 5v input current (+in, C in, shdn ) (note 2) .............. 10 ma output current (note 3) ..................................... 10 0ma operating temperature range (note 4).. C 40 c to 125 c specified temperature range (note 5) .. C 40 c to 125 c storage temperature range .................. C 65 c to 150 c junction temperature ........................................... 15 0 c lead temperature (soldering, 10 sec) ................... 30 0 c symbol parameter conditions min typ max units v os input offset voltage v cm = half supply l C350 C1000 50 350 1000 v v v cm = v + C 0.5v, npn mode l C2.2 C3.3 0.1 2.2 C3.3 mv mv d v os input offset voltage match (channel-to-channel) (note 7) v cm = half supply l C350 C550 50 350 550 v v v cm = v + C 0.5v, npn mode l C2.75 C4 0.1 2.75 4 mv mv v os t c input offset voltage drift l C3.5 v/ c i b input bias current (note 6) v cm = half supply l C0.75 C1.15 C 0.1 0.75 1.15 a a v cm = v + C 0.5v, npn mode l 0.8 0.4 1.4 3.0 5.0 a a i os input offset current v cm = half supply l C0.5 C0.6 C 0.03 0.5 0.6 a a v cm = v + C 0.5v, npn mode l C0.5 C0.6 C 0.03 0.5 0.6 a a e n input noise voltage density f = 1mhz 2.75 nv/ hz input 1/f noise voltage f = 0.1hz to 10hz 2 v p-p i n input noise current density f = 1mhz 4 pa/hz pin configuration (note 1) 1 2 3 4 5 out a ?in a +in a v ? shdna 10 9 8 7 6 v + out b ?in b +in b shdnb top view ms package 10-lead plastic msop + ? + ? t jmax = 150c, q ja = 160c/w (note 9) ltc6253-7 62537f
3 for more information www.linear.com/ltc6253-7 (v s = 5v) the l denotes the specifications which apply across the specified temperature range, otherwise specifications are at t a = 25c. for each amplifier v s = 5v, 0v; v shdn = 2v; v cm = v out = 2.5v, unless otherwise noted. electrical characteristics symbol parameter conditions min typ max units c in input capacitance differential mode common mode 2.5 0.8 pf pf r in input resistance differential mode common mode 7.2 3 k? m? a vol large signal voltage gain r l = 1k to half supply (note 9) l 35 16 60 v /mv v /mv r l = 100? to half supply (note 9) l 5 2.4 13 v /mv v /mv cmrr common mode rejection ratio v cm = 0v to 3.5v l 85 82 105 db db v cmr input common mode range l 0 v s v psrr power supply rejection ratio v s = 2.5v to 5.25v, v cm = 1v l 66.5 62 70 db db supply v oltage range (note 5) l 2.5 5.25 v v ol output swing low (v out C v C ) no load l 25 40 65 mv mv i sink = 5ma l 60 90 120 mv mv i sink = 25ma l 150 200 320 mv mv v oh output swing high (v + C v out ) no load l 65 100 120 mv mv i source = 5ma l 115 170 210 mv mv i source = 25ma l 270 330 450 mv mv i sc output short-circuit current sourcing l C90 C40 C32 ma ma sinking l 60 40 100 ma ma i s supply current per amplifier v cm = half supply l 3.3 3.5 4.8 ma ma v cm = v + C 0.5v l 4.25 4.85 5.9 ma ma i sd disable supply current v shdn = 0.8v l 42 55 75 a a i shdnl shdn pin current low v shdn = 0.8v l C3 C4 C 1.6 0 0 a a i shdnh shdn pin current high v shdn = 2v l C300 C600 35 300 600 na na v l shdn pin input voltage low l 0.8 v v h shdn pin input voltage high l 2 v i osd output leakage current in shutdown v shdn = 0.8v, output shorted to either supply 100 na t on turn-on time v shdn = 0.8v to 2v 3.5 s t off turn-off time v shdn = 2v to 0.8v 2 s ltc6253-7 62537f
4 for more information www.linear.com/ltc6253-7 electrical characteristics symbol parameter conditions min typ max units bw C3db closed loop bandwidth a v = 7, r l = 1k to half supply 160 mhz gbw gain-bandwidth product f = 10mhz, r l = 1k to half supply l 0.9 0.67 2 ghz ghz t s , 0.1% settling time to 0.1% a v = 7, 2v output step r l = 1k, v cc = 4.5v, v ee = 0.5v 32 ns sr slew rate a v = C6, 4v output step (note 10) l 300 250 500 v /s v /s fpbw full power bandwidth v out = 4v p-p (note 12) 13 mhz hd2/hd3 harmonic distortion r l = 1k to half supply, a v = +7, r f = 499 f c = 100khz, v o = 2v p-p f c = 1mhz, v o = 2v p-p f c = 5mhz, v o = 2v p-p 99/94 73/71 60/56 dbc dbc dbc r l = 1k? to half supply, a v = +7, r f = 3k f c = 100khz, v o = 2v p-p f c = 1mhz, v o = 2v p-p f c = 5mhz, v o = 2v p-p 105/109 82/87 66/67 dbc dbc dbc crosstalk a v = 7, r l = 1k to half supply, v out = 2v p-p , f = 2.5mhz C79 db (v s = 5v) the l denotes the specifications which apply across the specified temperature range, otherwise specifications are at t a = 25c. for each amplifier v s = 5v, 0v; v shdn = 2v; v cm = v out = 2.5v, unless otherwise noted. (v s = 2.7v) the l denotes the specifications which apply across the specified temperature range, otherwise specifications are at t a = 25c. for each amplifier v s = 2.7v, 0v; v shdn = 2v; v cm = v out = 1.35v, unless otherwise noted. symbol parameter conditions min typ max units v os input offset voltage v cm = half supply l 0 C300 700 1250 1500 v v v cm = v + C 0.5v, npn mode l C1.6 C2.0 0.9 3.2 3.4 mv mv d v os input offset voltage match (channel-to-channel) (note 8) v cm = half supply l C350 C750 10 350 750 v v v cm = v + C 0.5v, npn mode l C2.8 C4 0.1 2.8 4 mv mv v os t c input offset voltage drift l 2.75 v/ c i b input bias current (note 7) v cm = half supply l C1000 C1500 C 275 600 900 na na v cm = v + C 0.5v, npn mode l 0.6 0 1.175 2.5 4.0 a a i os input offset current v cm = half supply l C500 C600 C 150 500 600 na na v cm = v + C 0.5v, npn mode l C500 C600 C 30 500 600 na na e n input noise voltage density f = 1mhz 2.9 nv/ hz input 1/f noise voltage f = 0.1hz to 10hz 2 v p-p i n input noise current density f = 1mhz 3.6 pa/ hz c in input capacitance differential mode common mode 2.5 0.8 pf pf r in input resistance differential mode common mode 7.2 3 k? m? ltc6253-7 62537f
5 for more information www.linear.com/ltc6253-7 electrical characteristics (v s = 2.7v) the l denotes the specifications which apply across the specified temperature range, otherwise specifications are at t a = 25c. for each amplifier v s = 2.7v, 0v; v shdn = 2v; v cm = v out = 1.35v, unless otherwise noted. symbol parameter conditions min typ max units a vol large signal voltage gain r l = 1k to half supply (note 11) l 16.5 7 36 v /mv v /mv r l = 100? to half supply (note 11) l 2.3 1.8 6.9 v /mv v /mv cmrr common mode rejection ratio v cm = 0v to 1.2v l 80 77 105 db db v cmr input common mode range l 0 v s v psrr power supply rejection ratio v s = 2.5v to 5.25v, v cm = 1v l 66.5 62 70 db db supply v oltage range (note 5) l 2.5 5.25 v v ol output swing low (v out C v C ) no load l 22 28 40 mv mv i sink = 5ma l 80 100 140 mv mv i sink = 10ma l 110 150 190 mv mv v oh output swing high (v + C v out ) no load l 55 75 95 mv mv i source = 5ma l 125 150 200 mv mv i source = 10ma l 165 200 275 mv mv i sc short-circuit current sourcing l C35 C18 C14 ma ma sinking l 20 17 40 ma ma i s supply current per amplifier v cm = half supply l 2.9 3.5 4.5 ma ma v cm = v + C 0.5v l 3.7 4.6 5.5 ma ma i sd disable supply current v shdn = 0.8v l 24 35 50 a a i shdnl shdn pin current low v shdn = 0.8v l C1 C1.5 C 0.5 0 0 a a i shdnh shdn pin current high v shdn = 2v l C300 C600 45 300 600 na na v l shdn pin input voltage l 0.8 v v h shdn pin input voltage l 2.0 v i osd output leakage current magnitude in shutdown v shdn = 0.8v, output shorted to either supply 100 na t on turn-on time v shdn = 0.8v to 2v 5 s t off turn-off time v shdn = 2v to 0.8v 2 s bw C3db closed loop bandwidth a v = +7, r l = 1k to half supply 130 mhz gbw gain-bandwidth product f = 10mhz, r l = 1k to half supply l 0.8 0.5 1.3 ghz ghz ltc6253-7 62537f
6 for more information www.linear.com/ltc6253-7 electrical characteristics (v s = 2.7v) the l denotes the specifications which apply across the specified temperature range, otherwise specifications are at t a = 25c. for each amplifier v s = 2.7v, 0v; v shdn = 2v; v cm = v out = 1.35v, unless otherwise noted. symbol parameter conditions min typ max units t s , 0.1 settling time to 0.1% a v = +7, 2v output step r l = 1k, v cc = 2.35v, v ee = C0.35v 25 ns sr slew rate a v = C6, 2v output step (note 10) 300 v/s fpbw full power bandwidth v out = 2v p-p (note 12) 11 mhz crosstalk a v = +7, r l = 1k to half supply, v out = 2v p-p , f = 2.5mhz C88 db note 1: stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. exposure to any absolute maximum rating condition for extended periods may affect device reliability and lifetime. note 2: the inputs are protected by back-to-back diodes. if any of the input or shutdown pins goes 300mv beyond either supply or the differential input voltage exceeds 1.4v the input current should be limited to less than 10ma. this parameter is guaranteed to meet specified performance through design and/or characterization. it is not production tested. note 3: a heat sink may be required to keep the junction temperature below the absolute maximum rating when the output current is high. this parameter is guaranteed to meet specified performance through design and/or characterization. it is not production tested. note 4: the ltc6253-7i is guaranteed to meet specified performance from C40c to 85c. the ltc6253-7h is guaranteed to meet specified performance from C40c to 125c. note 5: supply voltage range is guaranteed by power supply rejection ratio test. note 6: the input bias current is the average of the average of the currents at the positive and negative input pins. note 7: matching parameters are the difference between the two amplifiers on the ltc6253-7. note 8: thermal resistance varies with the amount of pc board metal connected to the package. the specified values are with short traces connected to the leads with minimal metal area. note 9: the output voltage is varied from 0.5v to 4.5v during measurement. note 10: middle 2/3 of the output waveform is observed. r l = 1k to half supply. note 11: the output voltage is varied from 0.5v to 2.2v during measurement. note 12: fpbw is determined from distortion performance in a gain of +7 configuration with hd2, hd3 < C40dbc as the criteria for a valid output. typical performance characteristics v os vs temperature, v s = 5v, 0v (pnp stage) temperature (c) voltage offset (v) 300 0 100 ?100 ?400 200 ?200 ?300 ?500 ?600 ?15?35 62537 g05 5 25 65 85 105 125 ?55 v s = 5v, 0v v cm = 2.5v 6 devices 45 v os distribution, v cm = v s /2 (ms, pnp stage) v os distribution, v cm = v + C 0.5v (npn stage) input offset voltage (v) percent of units (%) 40 30 20 5 0 35 25 15 10 62537 g01 250 150 50 ?50 ?150 ?250 v s = 5v, 0v v cm = 2.5v input offset voltage (v) percent of units (%) 16 12 8 2 14 10 6 4 0 ?1200 400 ?400 62537 g03 1200 2000 ?2000 v s = 5v, 0v v cm = 4.5v ltc6253-7 62537f
7 for more information www.linear.com/ltc6253-7 typical performance characteristics offset voltage vs input common mode voltage v os vs temperature, v s = 2.7v, 0v (pnp stage) v os vs temperature, v s = 2.7v, 0v (npn stage) v os vs temperature, v s = 5v, 0v (npn stage) input common mode voltage (v) 0 offset voltage (v) 600 400 ?200 0 ?1600 200 ?400 ?600 ?800 ?1200 ?1000 ?1400 ?1800 ?2000 1.5 3.5 1 2.5 4.5 62537 g09 5 3 0.5 2 4 ?55c v s = 5v, 0v 25c 125c temperature (c) voltage offset (v) 2000 1000 1500 500 ?1000 0 ?500 ?1500 ?2000 ?2500 ?15?35 62537 g06 5 25 65 85 105 125 ?55 45 v s = 5v, 0v v cm = 4.5v 6 devices temperature (c) voltage offset (v) 1200 1000 1100 800 900 700 600 500 400 ?15?35 62537 g07 5 25 65 85 105 125 ?55 45 v s = 2.7v, 0v v cm = 1.35v 6 devices temperature (c) voltage offset (v) 3200 2200 2700 1700 1200 700 200 ?1300 ?800 ?300 ?1800 ?15?35 62537 g08 5 25 65 85 105 125 ?55 45 v s = 2.7v, 0v v cm = 2.2v 6 devices offset voltage vs output current warm-up drift vs time input bias current vs common mode voltage output current (ma) ?100 offset voltage (mv) 3.0 1.5 0.5 ?1.0 1.0 2.5 2.0 0 ?0.5 ?1.5 ?2.0 ?2.5 ?3.0 ?75 25 ?25 75 62537 g10 100 0 ?50 50 ?55c 25c 125c v s = 2.5v common mode voltage (v) 0 input bias current (na) 3000 2000 ?3000 1000 0 ?1000 ?2000 ?4000 ?5000 1.5 3.5 1 2.5 4.5 62537 g12 5 3 0.5 2 4 ?55c 25c 125c v s = 5v, 0v input bias current vs temperature 0.1hz to 10hz voltage noise time (1s/div) 0 voltage noise (500nv/div) 2000 1500 1000 500 0 ?1000 ?500 ?1500 ?2000 1 7 3 9 62537 g14 10 4 5 6 2 8 temperature (c) ?55 input bias current (na) 3000 2000 0 2500 500 1500 1000 ?500 355?25 95 62537 g13 125 65 v s = 5v, 0v v cm = 4.5v v cm = 2.5v ltc6253-7 62537f 140 160 180 200 ?20 ?15 ?10 ?5 0 5 time after power?up (s) 10 change in offset voltage (v) 62357 g11 0 20 40 60 80 100 120
8 for more information www.linear.com/ltc6253-7 typical performance characteristics supply current per amplifier vs shdn pin voltage input noise voltage and noise current vs frequency supply current vs supply voltage (per amplifier) total supply voltage (v) 0 supply current (ma) 5.0 4.5 4.0 3.5 3.0 1.5 1.0 2.5 2.0 0.5 0 1 3 62537 g16 4 5 2 ?55c 25c 125c frequency (hz) 1 voltage noise (nv/ hz) current noise (pa/hz) 1000 100 10 1.0 0.1 10 1k 100m 10m 62537 g15 10k 100k 1m 100 i n , v cm = 4.5v i n , v cm = 2.5v e n , v cm = 4.5v e n , v cm = 2.5v supply current vs input common mode voltage (per amplifier) common mode voltage (v) 0.25 1.25 supply current (ma) 5 4 3 2 3.25 62537 g17 4.25 4.75 2.25 125c 25c v s = 5v, 0v a v = 1 ?55c shdn pin voltage (v) 0 supply current (ma) 5.0 4.0 4.5 2.5 2.0 3.5 3.0 1.5 1.0 0.5 0 2.521.510.5 3.5 62537 g18 5 4 4.5 3 t a = 125c t a = 25c v s = 5v, 0v v cm = 2.5v t a = ?55c output saturation voltage vs load current (output low) output saturation voltage vs load current (output high) load current (ma) output high saturation voltage (v) 62537 g22 10 1 0.1 0.01 0.01 10 100 1 0.1 t a = 125c t a = 25c v s = 2.5v t a = ?55c load current (ma) output high saturation voltage (v) 62537 g23 10 1 0.1 0.01 0.01 10 100 1 0.1 t a = 125c v s = 2.5v t a = ?55c t a = 25c shdn pin current vs shdn pin voltage minimum supply voltage, v cm = v s /2 (pnp operation) minimum supply voltage, v cm = v + C 0.5v (npn operation) shdn pin voltage (v) 0 shdn pin current (a) 0.50 0.25 0 ?0.25 ?0.50 ?0.75 ?1.00 ?1.25 ?1.50 ?1.75 ?2.00 ?2.75 ?2.50 ?2.25 ?3.00 2.521.510.5 3.5 62537 g19 5 4 4.5 3 t a = 125c t a = 25c v s = 5v, 0v t a = ?55c total supply voltage (v) 2 offset voltage (mv) 16 10 12 14 8 6 4 2 0 ?2 2.5 3.5 62537 g20 5.5 125c 25c ?55c 4 4.5 5 3 v s = 5v, 0v total supply voltage (v) 2 offset voltage (mv) 16 10 12 14 8 6 4 2 0 ?4 ?2 2.5 3.5 62537 g21 5.5 125c ?55c 4 4.5 5 3 25c v s = 5v, 0v ltc6253-7 62537f
9 for more information www.linear.com/ltc6253-7 typical performance characteristics gain vs frequency (a v = 7) open loop gain output short-circuit current vs supply voltage open loop gain total supply voltage (v) 1.25 output short-circuit current (ma) 160 120 80 40 0 ?40 ?80 ?120 ?160 1.751.5 62537 g24 2.5 2 2.25 t a = 125c t a = 125c t a = ?55c t a = ?55c t a = 25c t a = 25c sink source pulse tested output voltage (v) r l = 100 to mid supply v s = 5v, 0v t a = 25c r l = 1k to gnd r l = 1k to mid supply r l = 100 to gnd 0 input offset voltage (v) 500 400 300 200 100 0 ?100 ?200 ?300 ?400 ?500 2.5 3.5 62537 g25 5 4 4.5 21.510.5 3 output voltage (v) 0 input offset voltage (v) 1600 1400 600 800 1000 1200 400 200 0 ?200 ?400 ?600 2.5 62537 g26 21.510.5 r l = 1k to mid supply v s = 2.7v, 0v t a = 25c r l = 1k to gnd r l = 100 to mid supply r l = 100 to gnd open loop gain and phase vs frequency gain bandwidth and phase margin vs supply voltage gain bandwidth and phase margin vs temperature ltc6253-7 62537f 1g gbw, 5v supply phase margin, 5v supply gbw, 2.7v supply phase margin, 2.7v supply temperature ( c) ?55 ?35 ?15 5 25 0 45 65 85 105 125 1000 1150 1300 1450 1600 2 1750 1900 2050 2200 2350 2500 10 20 30 40 4 50 60 70 80 90 gain bandwidth product (mhz) phase margin (deg) 62537 g31 6 8 10 12 14 16 r f = 365 r l =1k 18 20 gain (db) 62537 g27 v s = 1.35v v s = 1.35v v s = 2.5 v v s = 2.5v v s = 2.5v frequency (mhz) 3 10 100 frequency (hz) 400 0 10 20 30 40 50 60 70 80 10k 0 10 20 30 40 50 60 70 80 gain (db) 100k 62537 g29 phase (deg) gain t a = 25c r l = 1k phase phase margin 5.25 gain bandwidth product phase margin measured at an open loop gain of 7v/v r l = 1k supply voltage (v) 1m 2.50 3 3.50 4 4.50 5 1200 1300 1400 1500 10m 1600 1700 1800 1900 2000 2100 2200 10 20 30 100m 40 50 60 70 80 90 gain bandwidth product (mhz) phase margin (deg) 62537 g30 r l = 1k
10 for more information www.linear.com/ltc6253-7 typical performance characteristics power supply rejection ratio vs frequency output impedance vs frequency common mode rejection ratio vs frequency slew rate vs temperature v s = 2.5v t a = 25c 62537 g34 v s = 2.5v 2nd, r l = 100 3rd, r l = 100 3rd, r l = 1k 62537 g38 + ? v in r l r g 82.5 r f 499 2nd, r l = 1k v s = 2.5v a v = 7, r f = 499 v out = 2v p-p r s = 10 r s = 20 r s = 50 v s = 2.5v r f = 499, r g = 82.5, r l = 100mv output step distortion vs frequency, 5v supply series output resistor vs capacitive load (a v = 7) ltc6253-7 62537f 0.1 ?100 ?90 ?80 ?70 ?60 ?50 ?40 ?30 ?20 distortion (dbc) 1 capacitive load (pf) 10 100 1000 10000 0 6 12 18 24 10 30 36 42 48 54 60 overshoot (%) 62537 g36 100 500 0.1 1 10 100 1k a output impedance () 62537 g32 frequency (hz) 100k 1m 10m 100m 1g 0 10 v 20 30 40 50 60 70 80 90 100 cmrr (db) = 7, r 62537 g33 psrr + psrr ? frequency (hz) 10 100 1k 10k 100k 1m f 10m 100m 1g 0 10 20 30 40 50 60 = 499 70 80 power supply rejection ratio (db) slew rate measured at middle 2/3 of output v s f = 590 = 2.5v ?v out = 4v p-p a v = ?6v, r rising falling temperature (c) ?55 ?35 v s = 1.35v ?15 5 25 45 65 85 105 125 350 375 v s = 2.5v 400 425 450 475 500 525 550 575 600 625 frequency (mhz) 650 slew rate (v/s) 62537 g35 frequency (mhz) 0.01 0.1 1 10 ?120 ?110
11 for more information www.linear.com/ltc6253-7 62537 g39 2nd, r l = 100 3rd, r l = 100 2nd, r l = 1k 3rd, r l = 1k v s = 1.35v a v = 7, r f = 499 v out = 1v p-p + ? v in r l r g 82.5 r f 499 typical performance characteristics large signal response small signal response output overdriven recovery 0.1% settling time vs output step distortion vs frequency, (moderate loading, a v = 7) shdn pin response time maximum undistorted output signal vs frequency v s = 2.5v a v = 7 r f = 499 r l = 1k hd2, hd3 ?40dbc 62537 g42 62537 g43 v s = 4.5v, ?0.5v a v = 7 v out 1v/div a v = 7 v s = 2.5v r l = 1k v in = 280mv v shdn 2v/div 62537 g45 2s/div 1v/div a v = 7 v s = 2.5v t a = 25c r l = 1k 62537 g46 20ns/div input 10mv/div 0mv output 50mv/div 0mv a v = 7 v s = 2.5v t a = 25c r l = 1k 62537 g47 5ns/div v out 2v/div a v = 7 v s = 2.5v t a = 25c v in = 1v p-p v in 500mv/div 62537 g48 20ns/div distortion vs frequency, 2.7v supply ltc6253-7 62537f ?90 ?80 ?70 ?60 ?50 ?40 ?30 ?20 distortion (dbc) frequency (mhz) frequency (mhz) 0.01 0.1 1 10 100 0 1 2 3 4 0.01 5 output voltage swing (v p-p ) output step (v) ?4 ?3 ?2 ?1 0 1 2 0.1 3 4 25 30 35 40 45 settling time (ns) a v = 7,r f = 3k, r g = 499, r l = 1k hd3, v s = 1.35v 1 v out = 2v p-p , v s = 2.5v v out = 1v p-p , v s = 1.35v hd3, v s = 2.5v hd2, v s = 2.5v hd2, v s = 1.35v frequency (mhz) 0.01 0.1 1 10 10 ?130 ?120 ?110 ?100 ?90 ?80 ?70 ?60 ?50 distortion (dbc) ?120 62537 g49 ?110 ?100
12 for more information www.linear.com/ltc6253-7 applications information circuit description the ltc6253 -7 has an input and output signal range that extends from the negative power supply to the positive power supply. figure 1 depicts a simplified schematic of the amplifier. the input stage is comprised of two differ - ential amplifiers, a pnp stage, q1/q2, and an npn stage, q3 /q4 that are active over different common mode input voltages. the pnp stage is active between the negative supply to nominally 1.2v below the positive supply. as the input voltage approaches the positive supply, the transistor q5 will steer the tail current, i 1 , to the current mirror, q6/ q7 , activating the npn differential pair and the pnp pair becomes inactive for the remaining input common mode range. also, at the input stage, devices q17 to q19 act to cancel the bias current of the pnp input pair. when q1/q2 are active, the current in q16 is controlled to be the same as the current in q1 and q2. thus, the base current of q16 is nominally equal to the base current of the input devices. the base current of q16 is then mirrored by devices q17 to q19 to cancel the base current of the input devices q1/ q2 . a pair of complementary common emitter stages, q14 / q15, enable the output to swing from rail-to-rail. figure 1. ltc6253-7 simplified schematic diagram Cin: inverting input of amplifier. input range from v C to v + . +in: non-inverting input of amplifier. input range from v C to v + . v + : positive supply voltage. total supply voltage ranges from 2.5v to 5.25v. v C : negative supply voltage. typically 0v . this can be made a negative voltage as long as 2.5v (v + C v C ) 5.25v. shdn: active low shutdown. threshold is typically 1.1v referenced to v C . floating this pin will turn the part on. out: amplifier output. swings rail-to-rail and can typically source/sink over 90ma of current at a total supply of 5v. pin functions 625234 f01 q15 esdd5 q14 buffer and output bias r5 r4 q13 q12 i 3 v ? + q8 r3 q11 q9 q10 r2 r1 q2q1 q3q4 i 1 + i 2 + v bias q5 q6 q19 q7 d8 d7 q18 q17 d6 d5 esdd2 v ? esdd1 v + esdd4 v ? esdd3 v + q16 v ? v + +in ?in esdd6 out ltc6253-7 62537f
13 for more information www.linear.com/ltc6253-7 applications information input offset voltage the offset voltage will change depending upon which input stage is active. the pnp input stage is active from the negative supply rail to approximately 1.2v below the positive supply rail, then the npn input stage is activated for the remaining input range up to the positive supply rail with the pnp stage inactive. the offset voltage magnitude for the pnp input stage is trimmed to less than 350v with 5v total supply at room temperature, and is typically less than 150v . the offset voltage for the npn input stage is less than 2.2mv with 5v total supply at room temperature. input bias current the ltc6253 -7 uses a bias current cancellation circuit to compensate for the base current of the pnp input pair. this results in a typical i b of about 100na. when the in - put common mode voltage is less than 200mv , the bias cancellation cir cuit is no longer effective and the input bias current magnitude can reach a value above 4a. for common mode voltages ranging from 0.2v above the negative supply to 1.2v below the positive supply, the low input bias current allows the amplifiers to be used in applications with high source resistances where errors due to voltage drops must be minimized. output the ltc6253 -7 has excellent output drive capability. the amplifiers can typically deliver 90ma of output drive cur - rent at a total supply of 5v. the maximum output current is a function of the total supply voltage. as the supply voltage to the amplifier decreases, the output current capability also decreases. attention must be paid to keep the junction temperature of the ic below 150c (refer to the power dissipation section) when the output is in continuous short-circuit. the output of the amplifier has reverse-biased diodes connected to each supply. if the output is forced beyond either supply, extremely high current will flow through these diodes which can result in damage to the device. forcing the output to even 1v beyond either supply could result in several hundred mil - liamps of current through either diode. input protection the ltc6253-7 s input stages are protected against a large differential input voltage of 1.4v or higher by 2 pairs of back-to-back diodes to prevent the emitter-base break - down of the input transistors. in addition, the input and shutdown pins have reverse biased diodes connected to the supplies. the current in these diodes must be limited to less than 10ma. the amplifiers should not be used as comparators or in other open loop applications. esd the ltc6253 -7 has reverse-biased esd protection diodes on all inputs and outputs as shown in figure 1. there is an additional clamp between the positive and negative supplies that further protects the device during esd strikes. hot plugging of the device into a powered socket must be avoided since this can trigger the clamp resulting in larger currents flowing between the supply pins. capacitive loads the ltc6253 -7 has been optimized for speed and should not be used to drive large capacitors without resistive isolation. increased capacitance at the output creates an additional pole in the open loop frequency response, wors - ening the phase margin. when driving capacitive loads, a resistor of 10 to 100 should be connected between the amplifier output and the capacitive load to avoid ringing or oscillation. the feedback should be taken directly from the amplifier output. higher voltage gain configurations tend to have better capacitive drive capability than lower gain configurations due to lower closed loop bandwidth and hence higher phase margin. the graphs titled series output resistor vs capacitive load demonstrate the tran - sient response of the amplifier when driving capacitive loads with various series resistors. ltc6253-7 62537f
14 for more information www.linear.com/ltc6253-7 applications information figure 2. 0.7pf feedback cancels parasitic pole feedback components when feedback resistors are used to set up gain, care must be taken to ensure that the pole formed by the feedback resistors and the parasitic capacitance at the inverting input does not degrade stability. for example if the amplifier is set up in a gain of +11 configuration with a gain resistor of 1k and a feedback resistor of 10k, a parasitic capacitance of 7pf (device + pc board) at the amplifier s inverting input will cause the part to oscillate, due to a pole formed at 25mhz . an additional capacitor of 0.7pf across the feedback resistor as shown in figure 2 will eliminate any ringing or oscillation. in general, if the resistive feedback network results in a pole whose frequency lies within the closed loop bandwidth of the amplifier, a capacitor can be added in parallel with the feedback resistor to introduce a zero whose frequency is close to the frequency of the pole, improving stability. 62537 f02 c par 1k ? + v out v in 10k 0.7pf power dissipation the ltc6253 -7 is housed in a small 10-lead ms package and typically has a thermal resistance (q ja ) of 160c / w. it is necessary to ensure that the die s junction temperature does not exceed 150c. the junction temperature, t j , is calculated from the ambient temperature, t a , power dis- sipation, pd, and thermal resistance, q ja : t j = t a + (p d ? q ja ) the power dissipation in the ic is a function of the supply voltage, output voltage and load resistance. for a given supply voltage with output connected to ground or supply, the worst-case power dissipation p d(max) occurs when the supply current is maximum and the output voltage at half of either supply voltage for a given load resistance. p d(max) is approximately (since i s actually changes with output load current) given by: p d(max) = (v s i s(max) ) + v s 2 ? ? ? ? ? ? 2 / r l example: for an ltc6253-7 operating on 2.5v supplies and driving a 100 load to ground, the worst-case power dissipation is approximately given by p d(max) /amp = (5 ? 4.8ma) + (1.25) 2 /100 = 39.6mw if both amplifiers are loaded simultaneously then the total power dissipation is 79.2mw. at the absolute maximum ambient operating temperature, the junction temperature under these conditions will be: t j = t a + p d ? 160c/w = 125 + (0.079w ? 160c/w) = 137c which is less than the absolute maximum junction tem - perature for the ltc6253-7 (150c). shutdown the ltc6253 -7 has shdn pins that can shut down the amplifier to 42a typical supply current. the shdn pin needs to be taken within 0.8v of the negative supply for the amplifier to shut down. when left floating, the shdn pin is internally pulled up to the positive supply and the amplifier remains on. ltc6253-7 62537f
15 for more information www.linear.com/ltc6253-7 typical applications adc driver with gain figure 3 shows the ltc6253-7 acting as a gain of 7 stage driving the ltc2314-14 14- bit a/d converter. with a gain of 7v /v, for a 20.5khz signal a handsome sfdr of 89db can be obtained at a C1dbfs input signal, with an snr of 72db, at a sampling frequency of 2msps. figure 4 shows the fft of the adcs output. high speed low voltage instrumentation amplifier figure 5 shows a high speed three op amp instrumentation amplifier with a gain of 41v/v and bandwidth of 47mhz, operating from a total supply of 3.3v . op amps u1 and u2 figure 4. dynamic performance, ltc6253-7 driving ltc2314-14 figure 3. adc driver with gain c6 2.2f 5v c5 2.2f cs cs sck sck sdo sdo gnd 62537 f03 a in c1 47pf r1 100 v in = 0v to 580mv v dd ref ltc2314-14 8-pin tsot ov dd 3.3v r3 200 c7 2.2f 4.4v ?0.7v ? + ? ltc6253-7 r2 1.21k out v ? v + figure 5. high speed low voltage instrumentation amplifier 62537 f05 + ? r5 750 r6 750 r7 750 r8 750 r1 1.2k r3 30.1 u1 ? ltc6253-7 v s + v s ? r2 1.2k r9 200 c1 15pf a v = 41 bw = 47mhz v s = 1.65v i s = 9ma ? + u2 ? ltc6253-7 in + in ? v s + v s ? + ? u3 ? ltc6253 v out r4 30.1 are channels from an ltc6253 -7. op amp u3 can be an ltc6252 or one channel of an ltc6253. an rc snubber is used at the common terminal of the 30 gain setting resistors to eliminate the effects of any board layout induced coupling from the output of an amplifier to the negative input of the other amplifier. figure 6 shows the measured frequency response of the instrumentation amplifier for figure 6. instrumentation amplifier frequency response ltc6253-7 62537f 500 600 700 800 900 1000 ?130 ?120 ?110 ?100 f s = 2msps ?90 ?80 ?70 ?60 ?50 ?40 ?30 ?20 ?10 0 f1 = 20.5khz f1 amplitude = ?0.916dbfs sfdr = 89db snr = 72db amplitude (dbfs) 62537 f04 frequency (hz) 10k 100k 1m 10m 100m 400m 0 frequency (khz) 4 8 12 16 20 24 28 32 36 40 0 gain (db) 62537 f06 100 200 300 400
16 for more information www.linear.com/ltc6253-7 typical applications a load of 1k. figure 7 shows the measured cmrr across frequency. figure 8 shows the transient response with a 1.6v p-p output step, with the input applied to the positive input of the instrumentation amplifier, with the negative input grounded. figure 7. instrumentation amplifier cmrr figure 8. instrumentation amplifier transient response figure 9. low gain stage with higher noise gain figure 10. frequency response, low gain stage using the ltc6253-7 figure 11. transient response, sinusoidal input 0v 0v output 800mv/div 62537 f08 50ns/div input 20mv/div using a gain-of-7 stable op amp to achieve low closed loop gains many applications may demand higher slew rates and bandwidths associated with decompensated op amps like the ltc6253-7, but with lower closed loop gains. any circuit using the ltc6253-7 will be stable as long as the noise gain (gain for any noise referred to the inputs of the operational amplifier) is 7 or higher. figure 9 shows how such a circuit can be implemented. the overall signal gain is 1 + r f /r g , however the noise gain is 1 + r f /(r g ||r c ). figure 10 shows the measured frequency response of such a circuit. the low frequency gain is 9.5db (~3v /v) and is achieved by making r f = 499 and r g = 249 . resistor r c is chosen to be 124 , leading to a noise gain of ap - proximately 7v /v . the measured bandwidth of the circuit is an impressive 147mhz. figure 11 shows a 4v p-p output at a frequency of 13mhz. note that for r g = , r c = 82.5 , a closed loop gain of +1 can be obtained, with a noise gain of 7v /v, and such a circuit can be implemented with the ltc6253-7. r f r g r c ? + v in 62537 f09 v out 62537 f11 20ns/div 2v/div ltc6253-7 62537f 10 20 30 40 50 60 70 80 90 100 frequency (hz) cmrr (db) 62537 f07 v s = 2.5v frequency (hz) 100k 1m 10m 100m 10k 1g ?5 ?3 ?1 1 3 5 7 9 11 100k 13 15 gain (db) 62537 f10 r l = 1k 1m 10m 100m 400m 0
17 for more information www.linear.com/ltc6253-7 information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no representa - tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. package description please refer to http://www.linear.com/product/ltc6253-7#packaging for the most recent package drawings. msop (ms) 0213 rev f 0.53 0.152 (.021 .006) seating plane 0.18 (.007) 1.10 (.043) max 0.17 ?0.27 (.007 ? .011) typ 0.86 (.034) ref 0.50 (.0197) bsc 1 2 3 4 5 4.90 0.152 (.193 .006) 0.497 0.076 (.0196 .003) ref 8910 7 6 3.00 0.102 (.118 .004) (note 3) 3.00 0.102 (.118 .004) (note 4) note: 1. dimensions in millimeter/(inch) 2. drawing not to scale 3. dimension does not include mold flash, protrusions or gate burrs. mold flash, protrusions or gate burrs shall not exceed 0.152mm (.006") per side 4. dimension does not include interlead flash or protrusions. interlead flash or protrusions shall not exceed 0.152mm (.006") per side 5. lead coplanarity (bottom of leads after forming) shall be 0.102mm (.004") max 0.254 (.010) 0 ? 6 typ detail ?a? detail ?a? gauge plane 5.10 (.201) min 3.20 ? 3.45 (.126 ? .136) 0.889 0.127 (.035 .005) recommended solder pad layout 0.305 0.038 (.0120 .0015) typ 0.50 (.0197) bsc 0.1016 0.0508 (.004 .002) ms package 10-lead plastic msop (reference ltc dwg # 05-08-1661 rev f) ltc6253-7 62537f
18 for more information www.linear.com/ltc6253-7 ? linear technology corporation 2016 lt 0216 ? printed in usa linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax : (408) 434-0507 www.linear.com/ltc6253-7 typical application part number description comments operational amplifiers ltc6252/ltc6253/ ltc6254 single/dual/quad high speed rail-to-rail input and output op amps 720mhz , 3.5ma, 2.75nv/ hz , 280v/s, 0.35mv, unity gain stable ltc6268-10/ ltc6269-10 single/dual high speed fet input op amp 4ghz, 4nv/hz , 3f a input bias current LT1818/lt1819 single/dual wide bandwidth, high slew rate low noise and distortion op amps 400mhz, 9ma, 6nv/hz , 2500v/s, 1.5mv C85dbc at 5mhz lt1806/lt1807 single/dual low noise rail-to-rail input and output op amps 325mhz, 13ma, 3.5nv/ hz , 140v/s, 550v, 85ma output drive ltc6246/ltc6247/ ltc6248 single/dual/quad high speed rail-to-rail input and output op amps 180mhz, 1ma, 4.2nv/ hz , 90v/s, 0.5mv lt6230/lt6231/ lt6232 single/dual/quad low noise rail-to-rail output op amps 215mhz, 3.5ma, 1.1nv/ hz , 70v/s, 350v lt6200/lt6201 single/dual ultralow noise rail-to-rail input/output op amps 165mhz, 20ma, 0.95nv/ hz , 44v/s, 1mv lt6202/lt6203/ lt6204 single/dual/quad ultralow noise rail-to-rail op amp 100mhz, 3ma, 1.9nv/ hz , 25v/s, 0.5mv lt1468 16-bit accurate precision high speed op amp 90mhz, 3.9ma, 5nv/hz , 22v/s, 175v, C96.5db thd at 10v p-p , 100khz lt1801/lt1802 dual/quad low power high speed rail-to-rail input and output op amps 80mhz, 2ma, 8.5nvhz , 25v/s, 350v lt1028 ultralow noise, precision high speed op amps 75mhz, 9.5ma, 0.85nv/hz , 11v/s, 40v ltc6350 low noise single-ended to differential converter/adc driver 33mhz (C3db), 4.8ma, 1.9nv/ hz , 240ns settling to 0.01% 8v p-p adcs ltc2393-16 1msps 16-bit sar adc 94db snr ltc2366 3msps, 12-bit adc serial i/o 72db snr, 7.8mw no data latency tsot-23 package ltc2365 1msps, 12-bit adc serial i/o 73db snr, 7.8mw no data latency tsot-23 package related parts 101v/v 100mhz gain block frequency response 62537 ta02a ?2.5v 2.5v 909 100 ? + ? ltc6253-7 v in v out ?2.5v 2.5v 909 100 ? + ? ltc6253-7 ltc6253-7 62537f 20 30 40 50 gain (db) 62537 ta02b frequency (hz) 100k 1m 10m 100m 400m 0 10

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