ADVANCED LINEAR DEVICES, INC. ALD2706A/ALD2706B ALD2706 DUAL ULTRA MICROPOWER RAIL-TO-RAIL CMOS OPERATIONAL AMPLIFIER GENERAL DESCRIPTION FEATURES The ALD2706A/ALD2706B/ALD2706 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 80A maximum at 5V supply voltage. It is manufactured with Advanced Linear Devices' enhanced A CMOS silicon gate CMOS process. * Typical 20A supply current per amplifier * 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 -- 0.1pA * High source impedance applications * Dual power supply 1.0V to 5.0V * Single power supply +2V to +10V * High voltage gain * Unity gain bandwidth of 0.2MHz * Slew rate of 0.1V/s * Symmetrical output drive * Suitable for rugged, temperature-extreme environments The ALD2706A/ALD2706B/ALD2706 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. 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 25pF capacitive and 20K resistive loads. These features, combined with extremely low input currents, high open loop voltage gain of 100V/mV, useful bandwidth of 200KHz, a slew rate of 0.1V/ s, low offset voltage and temperature drift, make the ALD2706A/ ALD2706B/ALD2706 a versatile, micropower dual operational amplifier. A typical ALD2706A/ALD2706B/ALD2706 has the capacity to process a 0.998V amplitude analog signal with only 1.000V single supply voltage, while requiring only 0.1pA input bias current. Additionally, robust design and rigorous screening make this device especially suitable for operation in temperature-extreme environments and rugged conditions. 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 ORDERING INFORMATION ("L" suffix denotes lead-free (RoHS)) Operating Temperature Range 0C to +70C 0C to +70C -55C to 125C 8-Pin Small Outline Package (SOIC) 8-Pin Plastic Dip Package 8-Pin CERDIP Package ALD2706ASAL ALD2706BSAL ALD2706SAL ALD2706APAL ALD2706BPAL ALD2706PAL ALD2706ADA ALD2706BDA ALD2706DA OUT A 1 8 V+ -IN A 2 7 OUT B +IN A 3 6 -IN B V- 4 5 +IN B TOP VIEW SAL, PAL, DA PACKAGES * Contact factory for leaded (non-RoHS) or high temperature versions. Rev 2.0 (c)2010 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, CA 94089-1706 Tel: (408) 747-1155 Fax: (408) 747-1286 www.aldinc.com ABSOLUTE MAXIMUM RATINGS Supply voltage, V+ Differential input voltage range Power dissipation Operating temperature range SAL, PAL packages DA package Storage temperature range Lead temperature, 10 seconds CAUTION: ESD Sensitive Device. Use static control procedures in ESD controlled environment. 10.6V -0.3V to V+ +0.3V 600 mW 0C to +70C -55C to +125C -65C to +150C +260C OPERATING ELECTRICAL CHARACTERISTICS TA = 25C VS = 2.5V unless otherwise specified Min 2706B Typ Max Min 5.0 1.0 10.0 2.0 5.0 10.0 1.0 2.0 Symbol Supply Voltage VS V+ Input Offset Voltage VOS Input Offset Current IOS 0.1 20 200 0.1 20 200 Input Bias Current IB 0.1 20 200 0.1 20 200 Input Voltage Range VIR Input Resistance RIN Input Offset Voltage Drift TCVOS Min 2706A Typ Parameter 1.0 2.0 Max 2.0 2.8 -0.3 -2.8 5.3 2.8 2706 Typ Max Unit Test Conditions 5.0 10.0 V V Dual Supply Single Supply 10.0 11.0 mV mV RS 100K 0C TA +70C 0.1 20 200 pA pA TA = 25C 0C TA +70C 0.1 20 200 pA pA TA = 25C 0C TA +70C 5.3 2.8 V V V+ = +5 VS = 2.5V 5.0 5.8 -0.3 -2.8 5.3 2.8 -0.3 -2.8 1012 1012 1012 7 7 10 V/C RS 100K Power Supply Rejection Ratio PSRR 65 65 80 80 65 65 80 80 60 60 80 80 dB dB RS 100K 0C TA +70C Common Mode Rejection Ratio CMRR 65 65 83 83 65 65 83 83 60 60 83 83 dB dB RS 100K 0C TA +70C Large Signal Voltage Gain AV 10 100 300 10 100 300 5 80 300 V/mV V/mV V/mV RL = 100K RL 1M RL = 100K 0C TA +70C 10 Output Voltage Range VO low VO high 0.001 4.999 0.01 4.99 VO low VO high -2.40 2.40 -2.25 2.25 Output Short Circuit Current ISC Supply Current IS Power Dissipation PD ALD2706A/ALD2706B ALD2706 10 50 0.001 4.99 4.999 0.01 V V RL = 1M V+ = +5V 0C TA +70C -2.40 -2.25 -2.40 2.40 2.25 2.40 -2.25 V V RL = 100K 0C TA +70C 0.001 4.99 4.999 2.25 200 5 0.01 200 80 400 50 200 80 400 Advanced Linear Devices 50 A 80 400 A W VIN=0V No Load Both amplifiers VS = 2.5V 2 of 9 OPERATING ELECTRICAL CHARACTERISTICS (cont'd) TA = 25C VS = 2.5V unless otherwise specified Symbol Min 2706A Typ 1 1 Bandwidth BW 200 200 200 KHz Slew Rate SR 0.1 0.1 0.1 V/s AV = +1 RL = 100K Rise time tr 1.0 1.0 1.0 s RL = 100K 20 20 20 % RL = 100K CL = 25pF 10.0 10.0 10.0 s 0.1% AV = -1 CL = 25pF RL = 100K 140 140 140 dB AV = 100 ts Channel Separation CS Max Min Max Unit Test Conditions 1 Settling Time Min 2706 Typ CIN Overshoot Factor Max 2706B Typ Parameter Input Capacitance pF TA = 25C VS = 1.0V unless otherwise specified Parameter Symbol Min 2706A Typ Max Min 2706B Typ Max Min 2706 Typ Max Unit Test Conditions Power Supply Rejection Ratio PSRR 80 80 80 dB RS 1M Common Mode Rejection Ratio CMRR 80 80 80 dB RS 1M Large Signal Voltage Gain AV 50 50 50 V/mV RL = 1M Output Voltage Range VO low VO high V V RL = 1M Bandwidth BW 0.2 0.2 0.2 MHz Slew Rate SR 0.1 0.1 0.1 V/s AV =+1 CL = 25pF Unit Conditions RS 100K 0.9 -0.95 0.95 -0.9 0.9 -.95 0.95 -0.9 0.9 -0.95 0.95 -0.9 VS = 2.5V -55C TA +125C unless otherwise specified 2706ADA Typ Max Min VOS 3.0 6.0 12.0 mV Input Offset Current IOS 4.0 4.0 4.0 nA Input Bias Current IB 4.0 4.0 4.0 nA Power Supply Rejection Ratio PSRR 60 75 60 75 60 75 dB RS 1M Common Mode Rejection Ratio CMRR 60 83 60 83 60 83 dB RS 1M Large Signal Voltage Gain AV 10 50 10 50 5 50 V/mV RL = 1M Output Voltage Range VO low VO high 2.25 -2.40 2.40 -2.40 -2.25 2.40 2.25 -2.40 2.40 V V RL = 1M 2.25 Max Min Advanced Linear Devices Typ Test Input Offset Voltage -2.25 Typ 2706DA Symbol ALD2706A/ALD2706B ALD2706 Min 2706BDA Parameter Max -2.25 3 of 9 Design & Operating Notes: 1. The ALD2706A/ALD2706B/ALD2706 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 ALD2706A/ALD2706B/ALD2706 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 ALD2706A/ALD2706B/ALD2706 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 ALD2706A/ALD2706B/ALD2706 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 ALD2706A/ALD2706B/ALD2706 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 ALD2706A/ALD2706B/ALD2706, 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 0.1C above ambient temperature under most operating conditions. TYPICAL PERFORMANCE CHARACTERISTICS COMMON MODE INPUT VOLTAGE RANGE AS A FUNCTION OF SUPPLY VOLTAGE 7 INPUTS GROUNDED OUTPUT UNLOADED +25C 160 COMMON MODE INPUT VOLTAGE RANGE (V) SUPPLY CURRENT (A) SUPPLY CURRENT AS A FUNCTION OF SUPPLY VOLTAGE -25C TA = -55C 120 80 40 +125C +70C 0 6 TA = 25C 5 4 3 2 1 0 0 1 2 3 4 5 6 0 1 SUPPLY VOLTAGE (V) 5 6 7 10000 INPUT BIAS CURRENT (pA) OPEN LOOP VOLTAGE GAIN (V/mV) 4 INPUT BIAS CURRENT AS A FUNCTION OF AMBIENT TEMPERATURE 1000 100 10 VS = 2.5V TA = 25C VS = 2.5V 1000 100 10 1.0 0.1 100K 1M 10M LOAD RESISTANCE () ALD2706A/ALD2706B ALD2706 3 SUPPLY VOLTAGE (V) OPEN LOOP VOLTAGE GAIN AS AFUNCTION OF LOAD RESISTANCE 1 10K 2 -50 -25 0 25 50 75 100 125 AMBIENT TEMPERATURE (C) Advanced Linear Devices 4 of 9 TYPICAL PERFORMANCE CHARACTERISTICS (cont'd) OUTPUT VOLTAGE SWING AS A FUNCTION OF SUPPLY VOLTAGE OPEN LOOP VOLTAGE GAIN AS A FUNCTION OF SUPPLY VOLTAGE AND TEMPERATURE OUTPUT VOLTAGE SWING (V) OPEN LOOP VOLTAGE GAIN (V/mV) 1000 100 10 -55C TA +125C RL = 100K 6 -55C TA +125C RL = 100K 5 4 3 2 1 1 0 2 4 6 0 8 1 2 4 5 6 7 OPEN LOOP VOLTAGE GAIN AS A FUNCTION OF FREQUENCY 120 +5 +4 OPEN LOOP VOLTAGE GAIN (dB) VS = 2.5V +3 +2 +1 0 -1 -2 -3 -4 VS = 2.5V TA = 25C 100 80 60 0 40 45 20 90 0 135 180 -20 -5 -50 -25 0 +25 +50 +75 +100 +125 1 10 AMBIENT TEMPERATURE (C) INPUT OFFSET VOLTAGE AS A FUNCTION OF COMMON MODE INPUT VOLTAGE 100 1K 10K 100K FREQUENCY (Hz) 1M PHASE SHIFT IN DEGREES INPUT OFFSET VOLTAGE (mV) INPUT OFFSET VOLTAGE AS A FUNCTION OF AMBIENT TEMPERATURE REPRESENTATIVE UNITS INPUT OFFSET VOLTAGE (mV) 3 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) 10M LARGE - SIGNAL TRANSIENT RESPONSE 15 VS = 2.5V TA = 25C 10 2V/div VS = 1.0V TA = 25C RL = 100K CL= 25pF 500mV/div 10s/div 5 0 -5 -10 -15 -2 -1 0 +1 +2 +3 COMMON MODE INPUT VOLTAGE (V) LARGE - SIGNAL TRANSIENT RESPONSE 5V/div 2V/div ALD2706A/ALD2706B ALD2706 SMALL - SIGNAL TRANSIENT RESPONSE VS = 2.5V TA = 25C RL = 100K CL= 25pF 100mV/div 10s/div 50mV/div Advanced Linear Devices VS = 2.5V TA = 25C RL = 100K CL= 25pF 10s/div 5 of 9 TYPICAL APPLICATIONS RAIL-TO-RAIL VOLTAGE FOLLOWER/BUFFER RAIL-TO-RAIL WAVEFORM INPUT 5V ~ 1012 ZIN = +5V 0V 0.1F - +5V OUTPUT 0V OUTPUT + VIN 1/2 ALD2706 Performance waveforms. Upper trace is the output of a Wien Bridge Oscillator. Lower trace is the output of Rail-to-Rail voltage follower. 0 VIN 5V * See Rail to Rail Waveform RAIL-TO-RAIL WINDOW COMPARATOR HIGH INPUT IMPEDANCE RAIL-TO-RAIL PRECISION DC SUMMING AMPLIFIER +5V 1/2 ALD2706 8 V+ = +2.5V V1 100K VREF (HIGH) 3 + 1 10M + 0.1F V2 10M 10M 10M 2 - VOUT VIN VOUT 1/4 74 C00 5 0.1F + 7 V3 V4 100K V- VOUT V+ V- = - 2.5V 10M VREF (LOW) 6 - 4 VOUT = V1 + V2 - V3 - V4 RIN = 10M Accuracy limited by resistor tolerances and input offset voltage VOUT (LOW) FOR VREF (LOW) < VIN < VREF(HIGH) PHOTO DETECTOR CURRENT TO VOLTAGE CONVERTER HIGH IMPEDANCE NON-INVERTING AMPLIFIER 900K 100K RF = 5M +1V I PHOTODIODE 1/2 ALD2706 10M - +2.5V VOUT = 1 X RF VOUT + -2.5V VIN RL = 100K + -1V 1/2 ALD2706 1/2 ALD2706 LOW VOLTAGE INSTRUMENTATION AMPLIFIER 1/2 ALD2706 V+ 0.1F R3 100K + - R4 500K 100K V- V+ 0.1F 0.1F R1 50K f max = 20KHz -40mV VIN 40mV + VOUT V+ 1M 1/2 ALD2706 R2 100K - V- 0.1F V- 100K + 1/2 ALD2706 ALD2706A/ALD2706B ALD2706 V+ = +1.0V V- = -1.0V V- VOUT V+ All resistors are 1%. Advanced Linear Devices 1M VOUT = VIN ( 1+ 2R2 ) (R4) R1 R3 = 25 VIN 6 of 9 SOIC-8 PACKAGE DRAWING 8 Pin Plastic SOIC Package E Millimeters Dim S (45) D A Min 1.35 Max 1.75 Min 0.053 Max 0.069 A1 0.10 0.25 0.004 0.010 b 0.35 0.45 0.014 0.018 C 0.18 0.25 0.007 0.010 D-8 4.69 5.00 0.185 0.196 E 3.50 4.05 0.140 0.160 1.27 BSC e A A1 e Inches 0.050 BSC H 5.70 6.30 0.224 0.248 L 0.60 0.937 0.024 0.037 o 0 8 0 8 S 0.25 0.50 0.010 0.020 b S (45) H L ALD2706A/ALD2706B ALD2706 C o Advanced Linear Devices 7 of 9 PDIP-8 PACKAGE DRAWING 8 Pin Plastic DIP Package Millimeters E E1 D S A2 A1 e b A L Dim Min Max Min Max A 3.81 5.08 0.105 0.200 A1 0.38 1.27 0.015 0.050 A2 1.27 2.03 0.050 0.080 b 0.89 1.65 0.035 0.065 b1 0.38 0.51 0.015 0.020 c 0.20 0.30 0.008 0.012 D-8 9.40 11.68 0.370 0.460 E 5.59 7.11 0.220 0.280 E1 7.62 8.26 0.300 0.325 e 2.29 2.79 0.090 0.110 e1 7.37 7.87 0.290 0.310 L 2.79 3.81 0.110 0.150 S-8 1.02 2.03 0.040 0.080 0 15 0 15 o b1 Inches c e1 ALD2706A/ALD2706B ALD2706 o Advanced Linear Devices 8 of 9 CERDIP-8 PACKAGE DRAWING 8 Pin CERDIP Package E E1 Millimeters D A1 s A L L2 b b1 e L1 Inches Dim A Min Max 3.55 5.08 Min 0.140 Max 0.200 A1 1.27 2.16 0.050 0.085 b 0.97 1.65 0.038 0.065 b1 0.36 0.58 0.014 0.023 C 0.20 0.38 0.008 0.015 D-8 -- 10.29 -- 0.405 E 5.59 7.87 0.220 0.310 E1 7.73 8.26 0.290 0.325 e 2.54 BSC 0.100 BSC e1 7.62 BSC 0.300 BSC L 3.81 5.08 0.150 0.200 L1 3.18 -- 0.125 -- L2 0.38 1.78 0.015 0.070 S -- 2.49 -- 0.098 O 0 15 0 15 C e1 ALD2706A/ALD2706B ALD2706 o Advanced Linear Devices 9 of 9