rev 2.0 ?2010 advanced linear devices, inc. 415 tasman drive, sunnyvale, ca 94089-1706 tel: (408) 747-1155 fax: (408) 747-1286 www.aldinc.com general description the ald2701a/ald2701b/ald2701 is a dual monolithic cmos micropower 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. supply current is 500 a maximum at 5v supply voltage. it is manufactured with advanced linear devices' enhanced acmos silicon gate cmos process. the ald2701a/ald2701b/ald2701 is designed to offer a trade-off of performance parameters providing a wide range of desired specifications. it has been developed specifically for the +5v single supply or 1v to 5v dual supply user and offers the popular industry standard pin configuration of a741 and icl7621 types. 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 equal to 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 of 100v/mv, useful bandwidth of 700khz, a slew rate of 0.7v/ s, low power dissipation of 0.5mw, low offset voltage and temperature drift, make the ald2701a/ald2701b/ald2701 a versatile, micropower dual operational amplifier. the ald2701a/ald2701b/ald2701, designed and fabricated with silicon gate cmos technology, offers 1pa typical input bias current. on chip offset voltage trimming allows the device to be used without nulling in most applications. due to low voltage and low power operation, reliability and operating characteristics, such as input bias currents and warm up time, are greatly improved. additionally, robust design and rigorous screening make this device especially suitable for operation in temperature-extreme environments and rugged conditions. dual micropower rail-to-rail cmos operational amplifier ald2701a/ald2701b ald2701 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 ALD2701ASAL ald2701apal ald2701ada ald2701bsal ald2701bpal ald2701bda ald2701sal ald2701pal ald2701da * contact factory for leaded (non-rohs) or high temperature versions. ordering information (?l? suffix denotes lead-free (rohs)) features ? all parameters specified for +5v single supply or 2.5v dual supply systems ? rail to rail input and output voltage ranges ? unity gain stable ? extremely low input bias currents -- 1.0pa ? high source impedance applications ? 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 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
ald2701a/ald2701b advanced linear devices 2 of 9 ald2701 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 2.0 5.0 10.0 mv r s 100k ? voltage 2.8 5.8 11.0 mv 0 c t a +70 c input offset i os 1.0 25 1.0 25 1.0 30 pa t a = 25 c current 240 240 450 pa 0 c t a +70 c input bias i b 1.0 30 1.0 30 1.0 50 pa t a = 25 c current 300 300 600 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 + = +5 range -2.8 2.8 -2.8 2.8 -2.8 2.8 v v s = 2.5v input r in 10 12 10 12 10 12 ? resistance input offset tcv os 557 v/ cr s 100k ? voltage drift power supply psrr 65 80 65 80 60 80 db r s 100k ? rejection ratio 65 80 65 80 60 80 db 0 c t a +70 c common mode cmrr 65 83 65 83 60 83 db r s 100k ? rejection ratio 65 83 65 83 60 83 db 0 c t a +70 c large signal a v 15 100 15 100 10 80 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 240 500 240 500 240 500 av in = 0v current no load power p d 2.5 2.5 2.5 mw both amplifiers dissipation v s = 2.5v operating electrical characteristics t a = 25 c v s = 2.5v unless otherwise specified 2701a 2701b 2701 test parameter symbol min typ max min typ max min typ max unit conditions
ald2701a/ald2701b advanced linear devices 3 of 9 ald2701 operating electrical characteristics (cont'd) v s = 2.5v -55 c t a +125 c unless otherwise specified 2701ada 2701bda 2701da test parameter symbol min typ max min typ max min typ max unit conditions input offset v os 3.0 6.0 15.0 mv r s 100k ? voltage input offset i os 8.0 8.0 8.0 na current input bias i b 10.0 10.0 10.0 na current power supply psrr 60 75 60 75 60 75 db r s 100k ? rejection ratio common mode cmrr 60 83 60 83 60 83 db r s 100k ? rejection ratio large signal a v 10 50 10 50 7 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 ? t a = 25 c v s = 5.0v unless otherwise specified 2701a 2701b 2701 test parameter symbol min typ max min typ max min typ max unit conditions power supply psrr 83 83 83 db r s 100k ? rejection ratio common mode cmrr 83 83 83 db r s 100k ? rejection ratio large signal a v 250 250 250 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 input c in 111pf capacitance bandwidth b w 400 700 400 700 700 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 s0.1% time a v = -1 c l = 50pf r l = 100k ? channel c s 120 120 120 db a v = 100 separation t a = 25 c v s = 2.5v unless otherwise specified 2701a 2701b 2701 test parameter symbol min typ max min typ max min typ max unit conditions
ald2701a/ald2701b advanced linear devices 4 of 9 ald2701 typical performance characteristics input bias current as a function of ambient temperature ambient temperature ( c) 1000 100 10 0.1 1.0 input bias current (pa) 100 -25 0 75 125 50 25 -50 10000 v s = 2.5v 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 design & operating notes: 1. the ald2701a/ald2701b/ald2701 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 ald2701a/ald2701b/ald2701 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 ald2701a/ald2701b/ald2701 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 ald2701a/ald2701b/ ald2701 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 ald2701a/ald2701b/ald2701 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 not to exceed 0.3v of the power supply voltage levels. 6. the ald2701a/ald2701b/ald2701, 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. 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 supply current ( a) supply current as a function of supply voltage supply voltage (v) 800 400 600 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
ald2701a/ald2701b advanced linear devices 5 of 9 ald2701 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 ?
ald2701a/ald2701b advanced linear devices 6 of 9 ald2701 typical applications rail-to-rail voltage follower/buffer - + outpu t 5v 0.1 f * see rail to rail waveform 0 v in 5v v in z in = 10 12 ? ~ 1/2 ald2701 photo detector current to voltage converter + - +2.5v -2.5v r f = 5m i photodiode v out = 1 x r f r l = 100k 1/2 ald2701 high input impedance rail-to-rail precision dc summing amplifier 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 ald2701 rail-to-rail waveform performance waveforms. upper trace is the output of a wien bridge oscillator. lower trace is the output of rail-to-rail voltage follower. 0v +5v output 0v +5v input rail-to-rail window comparator +5v + - + - v in 100k v ref (high) v ref (low) 3 2 5 6 8 4 1 7 1/4 74 c00 1/2 ald2701 v out v out (low) for v ref (low) < v in < v ref(high) 100k 1/2 ald2701 wien bridge oscillator (rail-to-rail) sine wave generator 10k 10k 10k +2.5v -2.5v .01 f c = .01 f r = 10k - + 1/2 ald2701 f = 1 = 1.6khz 2 rc ~~ v out *see rail to rail waveform low voltage instrumentation amplifier 50k 100k 100k f max = 20khz -40mv v in 40mv - + 0.1 f 0.1 f v+ v- - + 100k 100k 1m - 500k 0.1 f v+ v+ 1m + 1m v- v- 0.1 f v out 1m ald1701 1/2 ald2701 gain = 25 v- v out v+ all resistors are 1% v+ = +1.0v v- = -1.0v short circuit input current 1 a 0.1 f 0.1 f v+ v- 1/2 ald2701
ald2701a/ald2701b advanced linear devices 7 of 9 ald2701 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
ald2701a/ald2701b advanced linear devices 8 of 9 ald2701 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
ald2701a/ald2701b advanced linear devices 9 of 9 ald2701 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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