?2014 advanced linear devices, inc., vers. 2.0 www.aldinc.com 1 of 9 general description the ald2732a/ald2732 is a precision dual low-cost low-power monolithic cmos operational amplifier intended for a broad range of precision appli- cations requiring exremely low input signal power. input signal power is the product of input offset voltage and input bias current, which represents the minimum required power draw from the signal source in order to drive the input of the operational amplifier. input signal power is also a figure of merit in source loading and its associated error, and is a measure of the basic signal resolution possible through the operational amplifier for a given signal source. for certain types of signal sources, signal loading directly translates into a significant distortion or "interface noise equivalent" term. manufactured with advanced linear devices' enhanced epad ? silicon gate cmos process, the ald2732a/ald2732 is designed to set a new standard in low input signal power requirements. the typical input loading at its input is 0.03 mv offset voltage and 0.01 pa input bias current at 25c, resulting in 0.0003 fw input signal power draw. this input characteristic virtually eliminates any loading effects on most types of signal sources, offering unparalled accuracy and signal integrity and fidelity. the ald2732a/ald2732 is ideally suited for capacitive and high sensitivity, high impedance signal sources. it is readily suited for +5v single supply (or 2v to 5v) systems, with low operating power dissipation, a traditional strength of cmos technology. it is offered with industry standard a741 and icl7611 pin configurations. the ald2732a/ald2732 can operate with rail to rail large signal input and output voltages with relatively high slew rate. the input voltage can be equal to or exceed the positive and negative supply voltages while the output voltage can swing close to these supply voltage rails. this feature signifi- cantly reduces the supply overhead voltage required to operate the opera- tional amplifier and allows numerous analog serial stages to operate in a low power supply environment. in addition, the device can accommodate mixed applications where digital and analog circuits may operate off the same power supply or battery. this device also features rail-to-rail input and output voltage ranges, tolerance to over-voltage input spikes of 300mv beyond supply rails, high open loop voltage gain, useful bandwidth of 1.5mhz, slew rate of 2.1v/ s, and low supply current of 0.8ma. finally, the output stage can typically drive up to 400pf capacitive loads in the unity gain mode and up to 4000pf capacitive loads at a gain of 5. these features make the ald2732a/ald2732 a versatile, high precision operational amplifier that is user friendly and easy to use with virtually no source loading and zero input-loading induced source errors. additionally, robust design and rigorous screening make this device especially suitable for operation in temperature-extreme environments and rugged conditions. features & benefits ? extremely low input offset voltages and extremely low input bias currents ? extremely low input signal power ? robust high-temperature operation ? industry standard pinout ? rail-to-rail input/output ? input bias current of 0.01pa at input offset voltage of 25 v ? no external components ? no internal chopper clocking noise ? no chopper dynamic power dissipation ? simple and cost effective ? small package size ? drive up to 4000pf load capacitance ? low power dissipation ? suitable for rugged, temperature-extreme environments applications ? precision cable driver ? sensor interface circuits ? unity gain buffer amplifier ? precision analog cable driver ? transducer biasing circuits ? capacitive and charge integration circuits ? biochemical probe interface ? signal conditioning ? portable instruments ? high source impedance electrode amplifiers ? precision sample and hold amplifiers ? precision current to voltage converter ? error correction circuits ? sensor compensation circuits ? precision gain amplifiers ? system output level shifter e epad tm ? n a b l e d e precision dual low power cmos operational amplifier ald2732a/ald2732 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 ald2732asal ald2732apal ALD2732ADA ald2732sal ald2732pal ald2732da * contact factory for leaded (non-rohs) or high temperature versions. ordering information (?l? suffix denotes lead-free (rohs)) 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
ald2732a/ald2732 advanced linear devices 2 of 9 supply voltage, v + 10.6v differential input voltage range -0.3v to v + +0.3v power dissipation 600mw 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. absolute maximum ratings operating electrical characteristics t a = 25 c v s = 2.5v unless otherwise specified ald2732a ald2732 test parameter symbol min typ max min typ max unit conditions supply voltage v s 2.0 5.0 2.0 5.0 v dual supply v + 4.0 10.0 4.0 10.0 v single supply input offset voltage v os 0.5 1.0 1.0 2.0 mv r s 100k ? input offset current i os 0.01 10 0.01 10 pa t a = 25 c 280 280 pa 0 c t a +70 c input bias current i b 0.01 10 0.01 10 pa t a = 25 c 280 280 pa 0 c t a +70 c input voltage range v ir -0.3 +5.3 -0.3 +5.3 v v + = +5v -2.8 +2.8 -2.8 +2.8 v v s = 2.5v input resistance r in 10 14 10 14 ? input offset voltage drift tcv os 55 v/ cr s 100k ? power supply rejection ratio psrr 85 85 db r s 100k ? common mode rejection ratio cmrr 85 85 db r s 100k ? large signal voltage gain a v 250 250 v/mv r l = 10k ? 500 500 v/mv r l = 1m ? output voltage range v o low 0.002 0.01 0.002 0.01 v r l = 1m ? , v + = 5v v o high 4.99 4.999 4.99 4.999 v 0 c t a +70 c v o low -2.44 -2.35 -2.44 -2.35 v r l =10k ? v o high 2.35 2.44 2.35 2.44 v 0 c t a +70 c output short circuit current i sc 88ma supply current i s 2.4 3.5 2.4 3.5 ma v in = 0v, no load power dissipation p d 12 17.5 12 17.5 mw v s = 2.5v input capacitance c in 1 1 pf maximum load c l 400 400 pf gain = 1 capacitance 4000 4000 pf gain = 5 input noise voltage en 26 26 nv/ hz f = 1khz input current noise in 0.6 0.6 fa/ hz f = 10hz bandwidth b w 1.0 1.5 1.0 1.5 mhz slew rate s r 1.4 2.1 1.4 2.1 v/ sa v = +1, r l = 10k ?
ald2732a/ald2732 advanced linear devices 3 of 9 operating electrical characteristics (cont'd) ald2732a ald2732 parameter symbol min typ max min typ max unit test conditions input offset voltage v os 0.5 2.0 0.7 3.5 mv r s 100k ? input offset current i os 2.0 2.0 na input bias current i b 2.0 2.0 na power supply rejection ratio psrr 85 85 db r s 100k ? common mode rejection ratio cmrr 97 97 db r s 100k ? large signal voltage gain a v 25 25 v/mv r l = 10k ? output voltage range v o low -2.40 -2.30 -2.40 -2.30 v r l = 10k ? v o high 2.30 2.40 2.30 2.40 v v s = 2.5v -55 c t a +125 c unless otherwise specified ald2732a ald2732 parameter symbol min typ max min typ max unit test conditions rise time t r 0.2 0.2 sr l = 10k ? overshoot factor 10 10 % r l = 10k ? , c l = 100pf settling time t s 8.0 8.0 s 0.01% 3.0 3.0 s 0.1%, a v = -1, r l = 1m ? , c l = 25pf t a = 25 c v s = 2.5v unless otherwise specified (cont'd) ald2732a ald2732 parameter symbol min typ max min typ max unit test conditions power supply rejection ratio psrr 85 85 db r s 100k ? common mode rejection ratio cmrr 97 97 db r s 100k ? large signal voltage gain a v 250 250 v/mv r l = 10k ? output voltage range v o low -4.90 -4.80 -4.90 -4.80 v r l = 10k ? v o high 4.80 4.93 4.80 4.93 bandwidth b w 1.7 1.7 mhz slew rate s r 2.8 2.8 v/ sa v = +1, c l = 50pf t a = 25 c v s = 5.0v unless otherwise specified
ald2732a/ald2732 advanced linear devices 4 of 9 design & operating notes: 1. the ald2732a/ald2732 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 ald2732a/ald2732 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. a unity gain buffer using the ald2732a/ald2732 will typically drive 400pf of external load ca- pacitance without stability problems. in the inverting unity gain con- figuration, it can drive up to 800pf of load capacitance. compared to other cmos operational amplifiers, the ald2732a/ald2732 has shown itself to be more resistant to parasitic oscillations. 2. the ald2732a/ald2732 has complementary p-channel and n-chan- nel input differential stages connected in parallel to accomplish rail to rail common mode input voltage ranges. 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 above the negative supply voltage. since offset voltage trimming on the ald2732a/ald2732 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 below this switching point. the user should how- ever, be aware that this switching does take place if the operational amplifier is connected as a unity gain buffer and should make provisions in the 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 14 ? 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 ald2732a/ald2732 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 ald2732a/ald2732 has an internal design architecture that provides robust high temperature operation. contact factory for custom screening versions. typical performance characteristics supply current as a function of supply voltage supply voltage (v) supply current (ma) 2.5 1.5 0 0.5 2.0 1.0 0 1 2 3 4 5 6 inputs grounded output unloaded -25 c +25 c +80 c +125 c t a = -55oc common mode input voltage range as a function of supply voltage supply voltage (v) common mode input voltage range (v) 5 3 0 1 4 2 0 1 2 3 4 5 6 6 t a = 25 c open loop voltage gain as a function of supply voltage and temperature supply voltage (v) open loop voltage gain (v/mv) 1000 100 10 1 0 1 2 3 4 5 6 -55 c { +25 c { +125 c { r l = 10k ? r l = 5k ? input bias current as a function of ambient temperature ambient temperature ( c) input bias current (pa) 100 10 1.0 0.01 0.1 1000 +100 -25 0 +75 +125 +50 +25 -50 v s = 2.5v
ald2732a/ald2732 advanced linear devices 5 of 9 typical performance characteristics (cont'd) open loop voltage gain as a function of frequency frequency (hz) open loop voltage gain (db) 90 0 45 180 135 phase shift in degrees 1 10 100 1k 10k 1m 10m 100k 120 100 80 60 40 20 0 -20 v s = 2.5v t a = 25 c open loop voltage gain as a function of load resistance load resistance ( ? ) open loop voltage gain (v/mv) 1000k 1k 10k 100k 1000 100 10 1 v s = 2.5v t a = 25 c large-signal transient response v s = 2.5v t a = 25 c r l = 100k ? c l = 50pf 5v/div 1v/div 2 s/div small-signal transient response v s = 2.5v t a = 25 c r l = 10k ? c l = 50pf 100mv/div 20mv/div 2 s/div output voltage swing as a function of supply voltage supply voltage (v) output voltage swing (v) 5 3 1 4 2 0 1 2 3 4 5 6 6 -55 c t a +125 c r l = 10k ? r l = 2k ?
ald2732a/ald2732 advanced linear devices 6 of 9 typical applications 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 ald1732 1/2 ald2732 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 ald2732 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 ald2732 high input impedance rail-to-rail precision dc summing amplifier rail-to-rail voltage follower/buffer - + output 5v 0.1 f * see rail to rail waveform 0 v in 5v v in z in = 10 12 ? ~ 1/2 ald2732 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 ald2732 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 ald2732 v out v out (low) for v ref (low) < v in < v ref(high) 100k 1/2 ald2732 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 waveform 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 ald2732 f = 1 = 1.6khz 2 rc ~~ v out * see rail to rail waveform
ald2732a/ald2732 advanced linear devices 7 of 9 8 pin plastic soic package 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 ? soic-8 package drawing l c h s (45 ) ? e a a 1 b d s (45 ) e
ald2732a/ald2732 advanced linear devices 8 of 9 8 pin plastic dip package 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 pdip-8 package drawing b 1 s b e e 1 d e a 2 a 1 a l c e 1 ?
ald2732a/ald2732 advanced linear devices 9 of 9 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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