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sgm721 SGM722 sgm723 sgm724 product description the sgm721 (single), SGM722 (dual), sgm723 (single with shutdown) and sgm724 (quad) are low noise, low voltage, and low power operational amplifiers, that can be designed into a wide range of applications. the sgm721/2/3/4 have a high gain- bandwidth product of 10mhz, a slew rate of 8.5v/ s, and a quiescent current of 0.97ma/amplifier at 5v. the sgm723 has a power-down disable feature that reduces the supply current to 160na. the sgm721/2/3/4 are designed to provide optimal performance in low voltage and low noise systems. they provide rail-to-rail output swing into heavy loads. the input common-mode voltage range includes ground, and the maximum input offset voltage is 4mv for sgm721/2/3/4. they are specified over the extended industrial temperature range ( ? 40c to +125c). the operating range is from 2.5v to 5.5v. the single version, sgm721 is available in sc70-5, sot23-5 and so-8 packages. sgm723 is available in sot23-6 and so-8 packages. the dual version SGM722 is available in so-8 and msop-8 packages. the quad version sgm724 is available in so-16 and tssop-16 packages. applications sensors audio active filters a/d converters communications test equipment cellular and cordless phones laptops and pdas photodiode amplification battery-powered instrumentation 970a, 10mhz, rail-to-rail i/o cmos operational amplifier features ? low cost ? rail-to-rail input and o utput 1mv typical v os ? high gain-bandwidth product: 10mhz ? high slew rate: 8.5v/s ? settling time to 0.1% with 2v step: 0.36 s ? overload recovery time: 0.4s ? low noise : 8 nv/ hz ? operates on 2.5 v to 5.5v supplies ? input voltage range = - 0.1 v to +5.6 v with v s = 5.5 v ? low power 0.97 ma/amplifier typical supply current sgm723 160na when disabled ? small packaging sgm721 available in sc70-5, sot23-5 and so-8 SGM722 available in msop-8 and so-8 sgm723 available in sot23-6 and so-8 sgm724 available in tssop-16 and so-16 pin configurations (top view) 1 2 3 4 5 out a -in a +in a -v s +v s -ind +ind sgm724 tssop-16 / so-16 6 7 8 9 10 11 12 13 14 15 16 -inb +inb -inc nc nc out b out c +inc out d nc = no connect +v s -in 1 2 3 4 5 out -v s +in sgm721 sc70-5 / sot23-5 (sgm723 only) -in +in -v s nc 1 2 3 4 5 6 7 8 +v s sgm721/723 so-8 nc out disable nc = no connect out b +v s +in b out a 1 2 3 4 5 6 7 8 -in a +in a -v s -in b SGM722 so-8 / msop-8 out 1 2 3 4 5 6 -v s +in +v s disable -in 723 sot23-6 sgm723 shengbang microelectronics co, ltd tel: 86/451/84348461 www.sg-micro.com rev. b
sgm721/2/3/4 electrical characteristics :v s = +5v (at t a = +25 ,v cm = vs/2, r l = 600 , unless otherwise noted) sgm721/2/3/4 typ min/max over temperature parameter condition +25 +25 0 to 70 -40 to 85 -40 to 125 units min/ max input characteristics input offset voltage (v os ) input bias current (i b ) input offset current (i os ) common-mode voltage range (v cm ) common-mode rejection ratio(cmrr) open-loop voltage gain( a ol ) input offset voltage drift ( ? v os / ? t ) v s = 5.5v v s = 5.5v, v cm = - 0.1v to 4 v v s = 5.5v, v cm = - 0.1v to 5.6 v r l = 600 ? ,vo = 0.15v to 4.85v r l =10k ? ,vo = 0.05v to 4.95v 1 1 1 -0.1 to +5.6 91 86 90 100 2.1 4 75 64 84 95 4.5 74 64 81 90 4.75 73 63 80 88 5 72.5 62 72 77 mv pa pa v db db db db v/ max typ typ typ min min min min typ output characteristics output voltage swing from rail output current (i out ) closed-loop output impedance r l = 600 ? r l = 10k ? f = 1mhz, g = +1 0.1 0.015 57 5.7 53 52 50 45 v v ma ? typ typ min typ power-down disable turn-on time turn-off time disable voltage-off disable voltage-on 2.2 0.8 0.8 2 s s v v typ typ max min power supply operating voltage range power supply rejection ratio (psrr) quiescent current/ amplifier (i q ) supply current when disabled (sgm723 only) v s = +2.5 v to + 5.5 v v cm = (-v s ) + 0.5v i out = 0 100 0.97 0.16 2.5 5.5 80 1.13 1 2.5 5.5 79 1.25 2.5 5.5 78 1.28 2.5 5.5 77 1.38 v v db ma a min max min max max dynamic performance gain-bandwidth product (gbp) phase margin( o ) full power bandwidth(bw p ) slew rate (sr) settling time to 0.1%( t s ) overload recovery time r l = 600 ? 1% distortion g = +1, 2 v output step g = +1, 2 v output step v in gain = vs 10 63.5 400 8.5 0.36 0.4 mhz degrees khz v/s s s typ typ typ typ typ typ noise performance voltage noise density (e n ) current noise density( i n ) f = 1khz f = 10khz f = 1khz 8 6.4 10 nv/ hz nv/ hz fa/ hz typ typ typ specifications subject to change without notice.
sgm721/2/3/4 package/ordering information model order number package description package option marking information sgm721xc5/tr sc70-5 tape and reel, 3000 721 sgm721xn5/tr sot23-5 tape and reel, 3000 721 sgm721 sgm721xs/tr so-8 tape and reel, 2500 sgm721xs SGM722xms/tr msop-8 tape and reel, 3000 SGM722xms SGM722 SGM722xs/tr so-8 tape and reel, 2500 SGM722xs sgm723xn6/tr sot23-6 tape and reel, 3000 723 sgm723 sgm723xs/tr so-8 tape and reel, 2500 sgm723xs sgm724xs/tr so-16 tape and reel, 2500 sgm724xs sgm724 sgm724xts tssop-16 tape and reel, 3000 sgm724xts absolute maximum ratings supply voltage, v+ to v- . ........................................... 7.5 v common-mode input voltage .................................... (?v s ) ? 0.5 v to (+v s ) +0.5v storage temperature range ..................... ?6 5 to +150 junction temperature ................................................. 160 operating temperature range ................. ?55 to +150 package thermal resistance @ t a = 25 sc70-5, ja ............................ ................. ................... 333 /w sot23-5, ja ........................ ...... ................................ 190 /w sot23-6, ja .......... ................. ................................... 190 /w so-8, ja .................. ........... ..... ....................................125 /w msop-8, ja .............. ..... ........................................... 216 /w so-16, ja ................... ....... ........................................... 82 /w tssop-16, ja ................ ...... ...................................... 105 /w lead temperature range (soldering 10 sec) ..................................................... 260 esd susceptibility hbm............................................ ..... ............. ............ ......1500v mm............................... ................. ....................................400v notes 1. 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. caution this integrated circuit can be damaged by esd. shengbang micro-electronics recommends that all integrated circuits be handled with appropriate precautions. failure to observe proper handling and installation procedures can cause damage. esd damage can range from subtle performance degradation to complete device failure. precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
sgm721/2/3/4 typical performance characteristics at t a = +25 ,v cm = vs/2, r l = 600 ? , unless otherwise noted. closed-loop output voltage swing 0 1 2 3 4 5 6 10 100 1000 10000 frequency(khz) output voltage(vp-p) vs = 5v v in = 4.9v p-p t a = 25 r l = 2k g = +1 output impedance vs.frequency 0 20 40 60 80 100 1 10 100 1000 10000 frequency(khz) output impedance( ) vs = 5v g = 100 g = 10 g = 1 positive overload recovery time(500ns/div) -50mv 0v 0v +2.5v vs = 2.5v r l = 10k v in = 50mv g = 100 negative overload recovery time(500ns/div) -50mv 0v 0v + 2.5v vs = 2 . 5v r l = 10k v in = 50mv g = 100 large-signal step response small-signal step response time(500ns/div) time(200ns/div) vs = 5v g = +1 c l = 200pf r l = 10k ? vs = 5v g = +1 c l = 100pf r l = 10k ? voltage ( 1v/div ) voltage ( 50mv/div )
sgm721/2/3/4 typical performance characteristics at t a = +25 ,v cm = vs/2, r l = 600 ? , unless otherwise noted. psrr vs.frequency 20 40 60 80 100 120 1 10 100 1000 10000 frequency(khz) psrr(db) vs = 5v cmrr vs.frequency 40 50 60 70 80 90 100 110 120 1 10 100 1000 10000 frequency(khz) cmrr(db) vs = 5v small-signal overshoot vs.load capacitance 0 10 20 30 40 50 60 70 1 10 100 1000 load capacitance(pf) small-signal overshoot(%) -os vs = 5v r l = 10k t a = 25 g = 1 +os input voltage noise spectral density vs.frequency 1 10 100 10 100 1000 10000 frequency(hz) voltage noise(nv/ hz ) vs = 5v r l = 620 channel separation vs.frequency 70 80 90 100 110 120 130 0.1 1 10 100 1000 10000 100000 frequency(khz) channel separation(db) vs = 5v r l = 620 t a = 25 g = 1 open-loop gain vs.temperature 70 80 90 100 110 120 -50 -30 -10 10 30 50 70 90 110 130 temperature() openCloop gain(db) r l = 600 r l = 10k
sgm721/2/3/4 typical performance characteristics at t a = +25 ,v cm = vs/2, r l = 600 ? , unless otherwise noted. cmrr vs.temperature 60 70 80 90 100 110 120 -50-30-101030507090110130 temperature() cmrr(db) v cm = - 0.1v to 5.6v v cm = - 0.1v to 4 v v s = 5.5v psrr vs.temperature 70 80 90 100 110 120 130 -50 -30 -10 10 30 50 70 90 110 130 temperature() psrr(db) v s = 2.5v to 5.5v supply current vs.temperature 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 -50 -30 -10 10 30 50 70 90 110 130 temperature() supply current(ma) v s = 5v v s = 3v v s = 2.5v shutdown current vs.temperature 20 60 100 140 180 220 260 300 -50 -30 -10 10 30 50 70 90 110 130 temperature() shutdown current(na) v s = 5v v s = 3v v s = 2.5v output voltage swing vs.output current 0 1 2 3 4 5 0 102030405060708090 output current(ma) output voltage(v) 25 135 -50 v s = 5v sourcing current sinking current output voltage swing vs.output current 0 1 2 3 0 102030405060 output current(ma) output voltage(v) 25 135 -50 v s = 3v sourcing current sinking current
sgm721/2/3/4 typical performance characteristics at t a = +25 ,v cm = vs/2, r l = 600 ? , unless otherwise noted. small-signal overshoot vs.load capacitance 0 10 20 30 40 50 60 70 1 10 100 1000 load capacitance(pf) small-signal overshoot(%) -os vs = 2.7v r l = 10k t a = 25 g = 1 +os output impedance vs.frequency 0 20 40 60 80 100 120 1 10 100 1000 10000 frequency(khz) output impedance( ) vs = 2.7v g = 10 g = 1 g = 100 large-signal step response small-signal step response time(500ns/div) time(200ns/div) closed-loop output voltage swing 0 0.5 1 1.5 2 2.5 3 10 100 1000 10000 frequency(khz) output voltage(vp-p) vs = 2.7v v in = 2.6v p-p t a = 25 r l = 2k g = 1 channel separation vs.frequency 70 80 90 100 110 120 130 0.1 1 10 100 1000 10000 100000 frequency(khz) channel separation(db) vs = 2.7v r l = 620 t a = 25 g = 1 vs = 2.7v g = +1 c l = 200pf r l = 10k ? vs = 2.7v g = +1 c l = 100pf r l = 10k ? voltage ( 1v/div ) voltage ( 50mv/div )
sgm721/2/3/4 typical performance characteristics at t a = +25 ,v cm = vs/2, r l = 600 ? , unless otherwise noted. offset voltage production distribution 0 3 6 9 12 15 18 21 24 27 30 33 -4 -3 -2 -1 0 1 2 3 4 offset voltage(mv) percent of amplifiers(%) typical production distribution of packaged units.
sgm721/2/3/4 application notes driving capacitive loads the sgm72x can directly drive 4700pf in unity-gain without oscillation. the unity-gain follower (buffer) is the most sensitive configuration to capacitive loading. direct capacitive loading reduces the phase margin of amplifiers and this results in ringing or even oscillation. applications that require greater capacitive drive capability should use an isolation resistor between the output and the capacitive load like the circuit in figure 1. the isolation resistor r iso and the load capacitor c l form a zero to increase stability. the bigger the r iso resistor value, the more stable v out will be. note that this method results in a loss of gain accuracy because r iso forms a voltage divider with the r load . v in v out sgm721 c l r iso figure 1. indirectly driving heavy capacitive load an improvement circuit is shown in figure 2. it provides dc accuracy as well as ac stability. r f provides the dc accuracy by connecting the inverting signal with the output. c f and r iso serve to counteract the loss of phase margin by feeding the high frequency component of the output signal back to the amplifier?s inverting input, thereby preserving phase margin in the overall feedback loop. v in v out sgm721 c l r iso r l r f c f figure 2. indirectly driving heavy capacitive load with dc accuracy for no-buffer configuration, there are two others ways to increase the phase margin: (a) by increasing the amplifier?s gain or (b) by placing a capacitor in parallel with the feedback resistor to counteract the parasitic capacitance associated with inverting node. power-supply bypassing and layout the sgm72x family operates fr om either a single +2.5v to +5.5v supply or dual 1.25v to 2.75v supplies. for single-supply operation, bypass the power supply v dd with a 0.1 f ceramic capacitor which should be placed close to the v dd pin. for dual-supply operation, both the v dd and the v ss supplies should be bypassed to ground with separate 0.1 f ceramic capacitors. 2.2 f tantalum capacitor can be added for better performance. good pc board layout techniques optimize performance by decreasing the amount of stray capacitance at the op amp?s inputs and output. to decrease stray capacitance, minimize trace lengths and widths by placing external components as close to the device as possible. use surface-mount components whenever possible. for the operational amplifier, soldering the part to the board directly is strongly recommended. try to keep the high frequency big current loop area small to minimize the emi (electromagnetic interfacing). sgm721 v dd vn vp v ss v out 10f 0.1f 10f 0.1f sgm721 vn vp v dd v ss (gnd) v out 10f 0.1f figure 3. amplifier with bypass capacitors grounding a ground plane layer is important for sgm72x circuit design. the length of the current path speed currents in an inductive ground return will create an un wanted voltage noise. broad ground plane areas will reduce the parasitic inductance. input-to-output coupling to minimize capacitive coupling, the input and output signal traces should not be parallel. this helps reduce unwanted positive feedback.
sgm721/2/3/4 typical application circuits differential amplifier the circuit shown in figure 4 performs the difference function. if the resistors ratios are equal ( r4 / r3 = r2 / r1 ), then v out = ( vp ? vn ) r 2 / r 1 + vref. vn vp v out sgm721 vref r1 r2 r3 r4 figure 4. differential amplifier instrumentation amplifier the circuit in figure 5 performs the same function as that in figure 4 but with the high input impedance. vn vp sgm721 vref r1 r2 r3 r4 v out sgm721 sgm721 figure 5. instrumentation amplifier low pass active filter the low pass filter shown in figure 6 has a dc gain of (-r 2 /r 1 ) and the ?3db corner frequency is 1/2 r 2 c. make sure the filter is within the bandwidth of the am plifier. the large values of feedback resistors can couple with parasitic capacitance and cause undesired effects such as ringing or oscillation in high-speed amplifiers. keep resistors value as low as possible and consistent with output loading consideration. v in v out sgm721 r1 r2 r3=r1//r2 c figure 6. low pass active filter
sgm721/2/3/4 package outline dimensions sc70-5 e1 d e1 e b a2 a a1 e l l1 0.20 c dimensions in millimeters dimensions in inches symbol min max min max a 0.900 1.100 0.035 0.043 a1 0.000 0.100 0.000 0.004 a2 0.900 1.000 0.035 0.039 b 0.150 0.350 0.006 0.014 c 0.080 0.150 0.003 0.006 d 2.000 2.200 0.079 0.087 e 1.150 1.350 0.045 0.053 e1 2.150 2.450 0.085 0.096 e 0.650typ 0.026typ e1 1.200 1.400 0.047 0.055 l 0.525ref 0.021ref l1 0.260 0.460 0.010 0.018 0 8 0 8
sgm721/2/3/4 package outline dimensions sot23-5 d e1 b a2 a a1 e l l c e1 0 0.20 e dimensions in millimeters dimensions in inches symbol min max min max a 1.050 1.250 0.041 0.049 a1 0.000 0.100 0.000 0.004 a2 1.050 1.150 0.041 0.045 b 0.300 0.400 0.012 0.016 c 0.100 0.200 0.004 0.008 d 2.820 3.020 0.111 0.119 e 1.500 1.700 0.059 0.067 e1 2.650 2.950 0.104 0.116 e 0.950typ 0.037typ e1 1.800 2.000 0.071 0.079 l 0.700ref 0.028ref l1 0.300 0.600 0.012 0.024 0 8 0 8
sgm721/2/3/4 package outline dimensions sot23-6 d e1 e b a2 a a1 e l l c e1 0 0.20 dimensions in millimeters dimensions in inches symbol min max min max a 1.050 1.250 0.041 0.049 a1 0.000 0.100 0.000 0.004 a2 1.050 1.150 0.041 0.045 b 0.300 0.400 0.012 0.016 c 0.100 0.200 0.004 0.008 d 2.820 3.020 0.111 0.119 e 1.500 1.700 0.059 0.067 e1 2.650 2.950 0.104 0.116 e 0.950typ 0.037typ e1 1.800 2.000 0.071 0.079 l 0.700ref 0.028ref l1 0.300 0.600 0.012 0.024 0 8 0 8
sgm721/2/3/4 package outline dimensions so-8 c l d e e e1 a2 b a a1 dimensions in millimeters dimensions in inches symbol min max min max a 1.350 1.750 0.053 0.069 a1 0.100 0.250 0.004 0.010 a2 1.350 1.550 0.053 0.061 b 0.330 0.510 0.013 0.020 c 0.190 0.250 0.007 0.010 d 4.780 5.000 0.188 0.197 e 3.800 4.000 0.150 0.157 e1 5.800 6.300 0.228 0.248 e 1.270typ 0.050typ l 0.400 1.270 0.016 0.050 0 8 0 8
sgm721/2/3/4 package outline dimensions msop-8 c l d e e1 a1 e b a2 a dimensions in millimeters dimensions in inches symbol min max min max a 0.800 1.200 0.031 0.047 a1 0.000 0.200 0.000 0.008 a2 0.760 0.970 0.030 0.038 b 0.30 typ 0.012 typ c 0.15 typ 0.006 typ d 2.900 3.100 0.114 0.122 e 0.65 typ 0.026 typ e 2.900 3.100 0.114 0.122 e1 4.700 5.100 0.185 0.201 l 0.410 0.650 0.016 0.026 0 6 0 6
sgm721/2/3/4 package outline dimensions so-16 c l d e e e1 b a a1 a2 dimensions in millimeters dimensions in inches symbol min max min max a 1.350 1.750 0.053 0.069 a1 0.100 0.250 0.004 0.010 a2 1.350 1.550 0.053 0.061 b 0.330 0.510 0.013 0.020 c 0.170 0.250 0.007 0.010 d 9.800 10.20 0.386 0.402 e 3.800 4.000 0.150 0.157 e1 5.800 6.200 0.228 0.244 e 1.270 (bsc) 0.050 (bsc) l 0.400 1.270 0.016 0.050 0 8 0 8
sgm721/2/3/4 package outline dimensions tssop-16 d e e1 e b a2 a pin #1 ident. a a1 l h c a dimensions in millimeters dimensions in inches symbol min max min max d 4.900 5.100 0.193 0.201 e 4.300 4.500 0.169 0.177 b 0.190 0.300 0.007 0.012 c 0.090 0.200 0.004 0.008 e1 6.250 6.550 0.246 0.258 a 1.100 0.043 a2 0.800 1.000 0.031 0.039 a1 0.020 0.150 0.001 0.006 e 0.65 (bsc) 0.026 (bsc) l 0.500 0.700 0.020 0.028 h 0.25(typ) 0.01(typ) 1 7 1 7
sgm721/2/3/4 revision history location page 11/06? data sheet changed from rev. a to rev. b changes to absolute maximum atings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 shengbang microelectronics co, ltd unit 3, chuangye plaza no.5, taihu northern street, yingbin road centralized industrial park harbin development zone harbin, heilongjiang 150078 p.r. china tel.: 86-451-84348461 fax: 86-451-84308461 www.sg-micro.com

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