rev 2.1 ?2011 advanced linear devices, inc. 415 tasman drive, sunnyvale, ca 94089-1706 tel: (408) 747-1155 fax: (408) 747-1286 www.aldinc.com dual micropower precision rail-to-rail cmos operational amplifier ald2711a/ald2711b ald2711 a dvanced l inear d evices, i nc. operating temperature range 0 c to +70 c0 c to +70 c -55 c to 125 c 8-pin 8-pin 8-pin small outline plastic dip cerdip package (soic) package package ald2711asal ald2711apal ald2711ada ald2711bsal ald2711bpal ald2711bda ald2711sal ald2711pal ALD2711DA * contact factory for leaded (non-rohs) or high temperature versions. ordering information (?l? suffix denotes lead-free (rohs)) general description the ald2711a/ald2711b/ ald2711 is a dual monolithic cmos micropower precision high slew rate operational amplifier intended for a broad range of analog applications using 1v to 5v dual power supply systems, as well as +2v to +10v battery operated systems. all device characteristics are specified for +5v single supply or 2.5v dual supply systems. typical supply current is 200 a at 5v supply voltage. it is manufactured with advanced linear devices' enhanced acmos silicon gate cmos process. the ald2711a/ald2711b/ ald2711 has been developed specifically for the +5v single supply or 1v to 5v dual supply user and has an input stage that operates to +300mv above and -300mv below the supply voltages with no adverse effects and/or phase reversals. several important characteristics of the device make application easier to implement at those voltages. first, each operational amplifier can operate with rail to rail input and output voltages. this means the signal input voltage and output voltage can be at the positive and negative supply voltages. this feature allows numerous analog serial stages and flexibility in input signal bias levels. second, each device was designed to accommodate mixed applications where digital and analog circuits may operate off the same power supply or battery. third, the output stage can typically drive up to 50pf capacitive and 10k ? resistive loads. these features, combined with extremely low input currents, high open loop voltage gain, high useful bandwidth, and slew rate make the ld2711a/ald2711b/ ald2711 a versatile, micropower operational amplifier. the ald2711a/ald2711b/ ald2711 with on-chip offset voltage trimming allows the device to be used without nulling in most applications. additionally, robust design and rigorous screening make this device especially suitable for operation in temperature-extreme environments and rugged conditions. the unique characteristics of the ald2711a/ald2711b/ ald2711 are modeled in an available macromodel. features ? designed and characterized for 5v operation ? linear mode operation with input voltages 300mv beyond supply rails ? output voltages to within 2mv of power supply rails when driving a high impedance load ? unity gain stable ? extremely low input bias currents -- 0.01pa ? dual power supply 1.0v to 5.0v ? single power supply +2v to +10v ? high voltage gain ? output short circuit protected ? unity gain bandwidth of 0.7mhz ? slew rate of 0.7v/ s ? low power dissipation ? symmetrical complementary output drive ? suitable for rugged, temperature-extreme environments applications ? voltage follower/buffer/amplifier ? charge integrator ? photodiode amplifier ? data acquisition systems ? high performance portable instruments ? signal conditioning circuits ? sensor and transducer amplifiers ? low leakage amplifiers ? active filters ? sample/hold amplifier ? picoammeter ? current to voltage converter pin configuration top view sal, pal, da packages 1 2 3 4 8 7 6 5 out a -in a +in a v + -in b +in b v - out b
ald2711a/ald2711b advanced linear devices 2 of 9 ald2711 absolute maximum ratings supply voltage, v + 10.6v differential input voltage range -0.3v to v + +0.3v power dissipation 600 mw operating temperature range sal, pal packages 0 c to +70 c da package -55 c to +125 c storage temperature range -65 c to +150 c lead temperature, 10 seconds +260 c caution: esd sensitive device. use static control procedures in esd controlled environment. supply v s 1.0 5.0 1.0 5.0 1.0 5.0 v dual supply voltage v + 2.0 10.0 2.0 10.0 2.0 10.0 v single supply input offset v os 0.25 0.65 0.5 1.0 0.8 1.5 mv r s 100k ? voltage 1.0 1.5 2.0 mv 0 c t a +70 c input offset i os 0.01 10 0.01 10 0.01 10 pa t a = 25 c current 280 280 280 pa 0 c t a +70 c input bias i b 0.01 10 0.01 10 0.01 10 pa t a = 25 c current 280 280 280 pa 0 c t a +70 c input voltage v ir -0.3 5.3 -0.3 5.3 -0.3 5.3 v v + = +5v range -2.8 2.8 -2.8 2.8 -2.8 2.8 v v s = 2.5v input r in 10 13 10 13 10 13 ? resistance input offset tcv os 557 v/ cr s 100k ? voltage drift power supply psrr 63 90 63 90 60 90 db r s 100k ? rejection ratio 63 90 63 90 60 90 db 0 c t a +70 c common mode cmrr 63 90 63 90 60 90 db r s 100k ? rejection ratio 63 90 63 90 60 90 db 0 c t a +70 c large signal a v 15 100 15 100 10 100 v/mv r l = 100k ? voltage gain 300 300 300 v/mv r l 1m ? 10 10 7 v/mv r l = 100k ? 0 c t a +70 c output v o low 0.001 0.01 0.001 0.01 0.001 0.01 v r l = 1m ? v + = +5v voltage v o high 4.99 4.999 4.99 4.999 4.99 4.999 v 0 c t a +70 c range v o low -2.48 -2.40 -2.48 -2.40 -2.48 -2.40 v r l = 100k ? v o high 2.40 2.48 2.40 2.48 2.40 2.48 v 0 c t a +70 c output short i sc 111ma circuit current supply i s 200 450 200 450 200 450 av in = 0v current no load power p d 1.0 2.25 1.0 2.25 1.0 2.25 v s = 2.5v both dissipation 0.25 0.6 0.25 0.6 0.25 0.6 mw v s = 1.0v amplifiers operating electrical characteristics t a = 25 c v s = 2.5v unless otherwise specified 2711a 2711b 2711 parameter symbol min typ max min typ max min typ max unit test conditions
ald2711a/ald2711b advanced linear devices 3 of 9 ald2711 operating electrical characteristics (cont'd) power supply psrr 100 100 100 db r s 100k ? rejection ratio common mode cmrr 100 100 100 db r s 100k ? rejection ratio large signal a v 300 300 300 v/mv r l = 100k ? voltage gain output voltage v o low -4.98 -4.90 -4.98 -4.90 -4.98 -4.90 v r l = 100k ? range v o high 4.90 4.98 4.90 4.98 4.90 4.98 v bandwidth b w 1.0 1.0 1.0 mhz slew rate s r 1.0 1.0 1.0 v/ sa v = +1 c l = 50pf t a = 25 c v s = 5.0v unless otherwise specified 2711a 2711b 2711 parameter symbol min typ max min typ max min typ max unit test conditions input capacitance c in 111pf bandwidth b w 700 700 700 khz slew rate s r 0.7 0.7 0.7 v/ sa v = +1 r l = 100k ? rise time t r 0.2 0.2 0.2 sr l = 100k ? overshoot 20 20 20 % r l = 100k ? factor c l = 50pf settling t s 10.0 10.0 10.0 s 0.1% a v = 100 time r l = 100k ? c l = 50pf channel c s 140 140 140 db a v = 100 separation t a = 25 c v s = 2.5v unless otherwise specified 2711a 2711b 2711 parameter symbol min typ max min typ max min typ max unit test conditions v s = 2.5v -55 c t a +125 c unless otherwise specified 2711ada 2711bda 2711da parameter symbol min typ max min typ max min typ max unit test conditions input offset v os 1.8 2.3 2.8 mv r s 100k ? voltage input offset i os 44 4na current input bias i b 44 4na current power supply psrr 60 85 60 85 60 85 db r s 100k ? rejection ratio common mode cmrr 60 83 60 83 60 83 db r s 100k ? rejection ratio large signal av 10 50 10 50 10 50 v/mv r l 100k ? voltage gain output voltage v o low -2.47 -2.40 -2.47 -2.40 -2.47 -2.40 v range v o high 2.35 2.45 2.35 2.45 2.35 2.45 v r l 100k ?
ald2711a/ald2711b advanced linear devices 4 of 9 ald2711 typical performance characteristics open loop voltage gain as a function of load resistance 10m load resistance ( ? ) 10k 100k 1m 1000 100 10 1 open loop voltage gain (v/mv) v s = 2.5v t a = 25 c common mode input voltage range as a function of supply voltage supply voltage (v) common mode input voltage range (v) 7 6 5 4 3 2 1 0 0 1 2 3 4 5 6 7 t a = 25 c design & operating notes: 1. the ald2711a/ald2711b/ald2711 cmos operational amplifier uses a 3 gain stage architecture and an improved frequency compensation scheme to achieve large voltage gain, high output driving capability, and better frequency stability. in a conventional cmos operational amplifier design, compensation is achieved with a pole splitting capacitor together with a nulling resistor. this method is, however, very bias dependent and thus cannot accommodate the large range of supply voltage operation as is required from a stand alone cmos operational amplifier. the ald2711a/ald2711b/ ald2711 is internally compensated for unity gain stability using a novel scheme that does not use a nulling resistor. this scheme produces a clean single pole roll off in the gain characteristics while providing for more than 70 degrees of phase margin at the unity gain frequency. 2. the ald2711a/ald2711b/ald2711 has complementary p-channel and n-channel input differential stages connected in parallel to accomplish rail to rail input common mode voltage range. this means that with the ranges of common mode input voltage close to the power supplies, one of the two differential stages is switched off internally. to maintain compatibility with other operational amplifiers, this switching point has been selected to be about 1.5v below the positive supply voltage. since offset voltage trimming on the ald2711a/ ald2711b/ald2711 is made when the input voltage is symmetrical to the supply voltages, this internal switching does not affect a large variety of applications such as an inverting amplifier or non-inverting amplifier with a gain larger than 2.5 (5v operation), where the common mode voltage does not make excursions above this switching point. the user should however, be aware that this switching does take place if the operational amplifier is connected as a unity gain buffer and should make provision in his design to allow for input offset voltage variations. 3. the input bias and offset currents are essentially input protection diode reverse bias leakage currents, and are typically less than 1pa at room temperature. this low input bias current assures that the analog signal from the source will not be distorted by input bias currents. normally, this extremely high input impedance of greater than 10 12 ? would not be a problem as the source impedance would limit the node impedance. however, for applications where source impedance is very high, it may be necessary to limit noise and hum pickup through proper shielding. 4. the output stage consists of class ab complementary output drivers, capable of driving a low resistance load. the output voltage swing is limited by the drain to source on-resistance of the output transistors as determined by the bias circuitry, and the value of the load resistor. when connected in the voltage follower configuration, the oscillation resistant feature, combined with the rail to rail input and output feature, makes an effective analog signal buffer for medium to high source impedance sensors, transducers, and other circuit networks. 5. the ald2711a/ald2711b/ald2711 operational amplifier has been designed to provide full static discharge protection. internally, the design has been carefully implemented to minimize latch up. however, care must be exercised when handling the device to avoid strong static fields that may degrade a diode junction, causing increased input leakage currents. in using the operational amplifier, the user is advised to power up the circuit before, or simultaneously with, any input voltages applied and to limit input voltages to not exceed 0.3v of the power supply voltage levels. 6. the ald2711a/ald2711b/ald2711, with its micropower operation, offers numerous benefits in reduced power supply requirements, less noise coupling and current spikes, less thermally induced drift, better overall reliability due to lower self heating, and lower input bias current. it requires practically no warm up time as the chip junction heats up to only 0.2 c above ambient temperature under most operating conditions. supply current ( a) supply current as a function of supply voltage supply voltage (v) 500 300 400 0 200 0 1 2 3 4 5 6 t a = -55 c +25 c +70 c +125 c inputs grounded output unloaded -25 c input bias current as a function of ambient temperature ambient temperature ( c) 100 10 1.0 0.01 0.1 input bias current (pa) 100 -25 0 75 125 50 25 -50 1000 v s = 2.5v
ald2711a/ald2711b advanced linear devices 5 of 9 ald2711 input offset voltage as a function of common mode input voltage common mode input voltage (v) -2 -1 0 +1 +3 +2 15 10 5 -5 -10 0 -15 input offset voltage (mv) v s = 2.5v t a = 25 c large - signal transient response 2v/div 500mv/div 5 s/div v s = 1.0v t a = 25 c r l = 100k ? c l = 50pf large - signal transient response 5v/div 2v/div 5 s/div v s = 2.5v t a = 25 c r l = 100k ? c l = 50pf input offset voltage as a function of ambient temperature representative units ambient temperature ( c) input offset voltage (mv) -50 -25 0 +25 +50 +75 +100 +125 +4 +5 +3 +1 +2 0 -2 -1 -4 -3 -5 v s = 2.5v open loop voltage gain as a function of frequency frequency (hz) 1 10 100 1k 10k 1m 10m 100k 120 100 80 60 40 20 0 -20 open loop voltage gain (db) 90 0 45 180 135 phase shift in degrees v s = 2.5v t a = 25 c small - signal transient response 100mv/div 20mv/div 2 s/div v s = 2.5v t a = 25 c r l = 100k ? c l = 50pf typical performance characteristics (cont'd) open loop voltage gain as a function of supply voltage and temperature supply voltage (v) 1000 100 10 1 open loop voltage gain (v/mv) 0 2 4 6 8 -55 c t a +125 c r l = 100k ? output voltage swing as a function of supply voltage supply voltage (v) 0 1 2 3 4 7 6 5 6 5 4 3 2 1 output voltage swing (v) -55 c t a +125 c r l = 100k ?
ald2711a/ald2711b advanced linear devices 6 of 9 ald2711 typical applications photo detector current to voltage converter low voltage instrumentation amplifier wien bridge oscillator (rail-to-rail) sine wave generator rail-to-rail voltage follower/buffer rail-to-rail waveform 0v +5v output 0v +5v input v- = - 2.5v 10m 10m 10m 10m 10m 10m r in = 10m ? accuracy limited by resistor tolerances and input offset voltage v+ = +2.5v - + 0.1 f 0.1 f v out v- v in v+ v- v out v+ v 1 v 4 v 3 v 2 v out = v 1 + v 2 - v 3 - v 4 1/2 ald2711 high input impedance rail-to-rail precision dc summing amplifier rail-to-rail window comparator 10k 10k 10k +2.5v -2.5v .01 f c = .01 f r = 10k - + 1/2 ald2711 f = 1 = 1.6khz 2 rc ~~ v out * see rail-to-rail waveform +5v + - + - v in 100k v ref (high) v ref (low) 3 2 5 6 8 4 1 7 1/4 74 c00 1/2 ald2711 v out v out (low) for v ref (low) < v in < v ref(high) 100k 1/2 ald2711 - + outpu t 5v 0.1 f * see rail-to-rail waveform 0 v in 5v v in z in = 10 13 ? ~ 1/2 ald2711 + - +2.5v -2.5v r f = 5m i photodiode v out = i x r f r l = 100k 1/2 ald2711 50k 100k 100k f max = 20khz -40mv v in 40mv - + 0.1 f 0.1 f v+ v- 0.1 f 0.1 f v+ v- - + 100k 100k - 500k 0.1 f v+ v+ 1m + 1m v- v- 0.1 f v out 1m 1/2 ald2711 1/2 ald2711 gain = 25 v- v out v+ all resistors are 1% v+ = +1.0v v- = -1.0v short circuit input current 1 a 1m 1/2 ald2711 performance waveforms. upper trace is the output of a wien bridge oscillator. lower trace is the output of rail-to-rail voltage follower.
ald2711a/ald2711b advanced linear devices 7 of 9 ald2711 8 pin plastic soic package soic-8 package drawing millimeters inches min max min max dim a a 1 b c d-8 e e h l s 1.75 0.25 0.45 0.25 5.00 4.05 6.30 0.937 8 0.50 0.053 0.004 0.014 0.007 0.185 0.140 0.224 0.024 0 0.010 0.069 0.010 0.018 0.010 0.196 0.160 0.248 0.037 8 0.020 1.27 bsc 0.050 bsc 1.35 0.10 0.35 0.18 4.69 3.50 5.70 0.60 0 0.25 ? l c h s (45 ) ? e a a 1 b d s (45 ) e
ald2711a/ald2711b advanced linear devices 8 of 9 ald2711 8 pin plastic dip package pdip-8 package drawing b 1 s b e e 1 d e a 2 a 1 a l c e 1 ? millimeters inches min max min max dim a a 1 a 2 b b 1 c d-8 e e 1 e e 1 l s-8 ? 3.81 0.38 1.27 0.89 0.38 0.20 9.40 5.59 7.62 2.29 7.37 2.79 1.02 0 5.08 1.27 2.03 1.65 0.51 0.30 11.68 7.11 8.26 2.79 7.87 3.81 2.03 15 0.105 0.015 0.050 0.035 0.015 0.008 0.370 0.220 0.300 0.090 0.290 0.110 0.040 0 0.200 0.050 0.080 0.065 0.020 0.012 0.460 0.280 0.325 0.110 0.310 0.150 0.080 15
ald2711a/ald2711b advanced linear devices 9 of 9 ald2711 8 pin cerdip package cerdip-8 package drawing a a 1 b b 1 c d-8 e e 1 e e 1 l l 1 l 2 s ? 3.55 1.27 0.97 0.36 0.20 -- 5.59 7.73 3.81 3.18 0.38 -- 0 5.08 2.16 1.65 0.58 0.38 10.29 7.87 8.26 5.08 -- 1.78 2.49 15 millimeters inches min max min max dim 0.140 0.050 0.038 0.014 0.008 -- 0.220 0.290 0.150 0.125 0.015 -- 0 0.200 0.085 0.065 0.023 0.015 0.405 0.310 0.325 0.200 -- 0.070 0.098 15 2.54 bsc 7.62 bsc 0.100 bsc 0.300 bsc e e 1 c e 1 ? s b l d b 1 e a l 2 a 1 l 1
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