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| ADVANCED LINEAR DEVICES, INC. ALD2702A/ALD2702B ALD2702 DUAL 5V RAIL-TO-RAIL PRECISION OPERATIONAL AMPLIFIER GENERAL DESCRIPTION The ALD2702 is a dual monolithic operational amplifier intended primarily for a wide range of analog applications in +5V single power supply and 5V dual power supply systems as well as +4V to +12V battery operated systems. All device characteristics are specified for +5V single supply or 2.5V dual supply systems. The device has an input stage that operates to +300mV above and -300mV below the supply voltages with no adverse effects and/or phase reversals. It offers popular industry pin configuration. The ALD2702 has been developed specifically with the +5V single supply or 2.5V dual supply user in mind. Several important characteristics of the device make many applications easy to implement for these supply voltages. First, the operational amplifier can operate with rail to rail input and output voltages. This feature allows numerous analog serial stages to be implemented without losing operating voltage margin. Secondly, the device was designed to accommodate mixed applications where digital and analog circuits may work off the same 5V power supply. Thirdly, the output stage can drive up to 400pF capacitive and 5K resistive loads in non-inverting unity gain connection and double the capacitance in the inverting unity gain mode. These features, coupled with extremely low input currents, high voltage gain, useful bandwidth of 1.5MHz, a slew rate of 1.9V/s, low power dissipation, low offset voltage and temperature drift, make the ALD2702 a truly versatile, user friendly, operational amplifier. The ALD2702 is designed and fabricated with silicon gate CMOS technology, and offers less than 1pA typical input bias current. On-chip offset voltage trimming allows the device to be used without nulling in most applications. The device offers typical offset drift of less than 7V/C which eliminates many trim or temperature compensation circuits. For precision applications, the ALD2702 is designed to settle to 0.01% in 8s. FEATURES * Rail-to-rail input and output voltage range * Symmetrical push-pull class AB output drivers * All parameters specified for +5V single supply or 2.5V dual supply systems * High load capacitance capability -- drives up to 4000pF typical * No frequency compensation required -unity gain stable * Extremely low input bias currents -<1.0pA typical * Ideal for high source impedance applications * Dual power supply 2.5V to 6V operation * Single power supply +5V to +12V operation * High voltage gain -- typically 85V/mV @ 2.5V and 250V/mV @ 5.0V * Drive as low as 2K load with 5mA drive current * Output short circuit protected * Unity gain bandwidth of 1.5MHz * Slew rate of 1.9V/s * Low power dissipation APPLICATIONS * * * * * * * * * * * * * Voltage follower/buffer 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 Coaxial cable driver ORDERING INFORMATION Operating Temperature Range * -55C to +125C 0C to +70C 0C to +70C 8-Pin CERDIP Package ALD2702A DA ALD2702B DA ALD2702 DA 8-Pin Small Outline Package (SOIC) ALD2702A SA ALD2702B SA ALD2702 SA 8-Pin Plastic Dip Package ALD2702A PA ALD2702B PA ALD2702 PA PIN CONFIGURATION V+ OUT B -IN B +IN B OUT A -IN A +IN A V- 1 2 3 4 TOP VIEW DA, PA, SA PACKAGE 8 7 6 5 * Contact factory for industrial temperature range (c) 1998 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, California 94089 -1706 Tel: (408) 747-1155 Fax: (408) 747-1286 http://www.aldinc.com ABSOLUTE MAXIMUM RATINGS Supply voltage, V+ referenced to VSupply voltage, VS referenced to VDifferential input voltage range Power dissipation Operating temperature range PA, SA package DA package Storage temperature range Lead temperature, 10 seconds -0.3V to V++13.2V 6.6V 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 Parameter Supply Voltage Input Offset Voltage Input Offset Current Input Bias Current Input Voltage Range Input Resistance Input Offset Voltage Drift Power Supply Rejection Ratio Common Mode Rejection Ratio Large Signal Voltage Gain Output Voltage Range Symbol VS V+ VOS IOS IB VIR RIN TCVOS PSRR 65 65 65 65 15 -0.3 -2.8 10 12 1.0 1.0 Min 2.0 4.0 2702A Typ Max 6.0 12.0 1.0 1.5 20 240 20 300 5.3 +2.8 -0.3 -2.8 10 12 1.0 1.0 Min 2.0 4.0 2702B Typ Max Min 2702 Typ Max 6.0 12.0 5.0 6.0 1.0 1.0 -0.3 -2.8 1012 20 240 20 300 5.3 +2.8 Unit V V mV mV pA pA pA pA V V V/C dB RS 100K R S 100K 0C TA +70C RS 100K 0C TA +70C RL = 10K RL 1M R L = 1M Single supply 0C TA +70C R L = 10K Dual supply 0C TA +70C Test Conditions Single Supply RS 100K 0C TA +70C TA = 25C 0C TA +70C TA = 25C 0C TA +70C V+ = +5V VS = 2.5V 6.0 2.0 12.0 4.0 2.0 3.0 20 240 20 300 5.3 +2.8 7 83 83 83 83 28 100 0.002 4.998 -2.44 2.44 8 0.01 4.99 -2.40 2.40 65 65 65 65 15 7 83 83 83 83 28 100 63 63 63 63 12 7 83 83 83 83 28 100 0.002 4.998 -2.44 2.44 8 0.01 CMRR dB AV V/mV V/mV VO low VO high VO low VO high 4.99 2.40 0.002 0.01 4.998 4.99 -2.44 -2.40 2.44 2.40 8 V -2.40 V V mA Output Short Circuit Current Supply Current Power Dissipation Input Capacitance Bandwidth Slew Rate Rise time Overshoot Factor ISC IS PD 2.0 3.0 2.0 3.0 2.0 3.0 mA VIN = 0V No Load Both amplifiers VS = 2.5V 10 15.0 10 15.0 10 15.0 mW CIN 1 1 1 pF BW SR tr 0.7 1.1 1.5 1.9 0.2 10 0.7 1.1 1.5 1.9 0.2 10 0.7 1.1 1.5 1.9 0.2 10 MHz V/s s % AV = +1 RL = 10K RL = 10K RL = 10K CL = 100pF ALD2702A/ALD2702B ALD2702 Advanced Linear Devices 2 OPERATING ELECTRICAL CHARACTERISTICS (cont'd) T A = 25C VS = 2.5V unless otherwise specified Parameter Maximum Load Capacitance Symbol CL Min 2702A Typ 400 4000 Max Min 2702B Typ 400 4000 Max Min 2702 Typ 400 4000 Max Unit pF pF Test Conditions Gain = 1 Gain = 5 Input Noise Voltage en 26 26 26 nV/HZ f = 1KHZ Input Current Noise in 0.6 0.6 0.6 fA/HZ f = 10HZ Settling Time ts 8.0 3.0 8.0 3.0 8.0 3.0 s s 0.01% 0.1% AV = -1 RL = 5K CL = 50pF TA = 25C VS = 5.0V unless otherwise specified Parameter Power Supply Rejection Ratio Common Mode Rejection Ratio Large Signal Voltage Gain Output Voltage Range Bandwidth Slew Rate Symbol PSRR Min 2702A Typ 83 Max Min 2702B Typ 83 Max Min 2702 Typ 83 Max Unit dB Test Conditions RS 100K CMRR 83 83 83 dB RS 100K AV VO low VO high BW SR 250 250 250 V/mV RL = 10K RL = 10K 4.8 -4.90 4.93 1.7 2.8 -4.8 4.8 -4.90 4.93 1.7 2.8 -4.8 4.8 -4.90 4.93 1.7 2.8 -4.8 V MHZ V/s AV =+1 CL =50pF VS = +5.0V -55C TA +125C unless otherwise specified Parameter Input Offset Voltage Input Offset Current Input Bias Current Power Supply Rejection Ratio Common Mode Rejection Ratio Large Signal Voltage Gain Output Voltage Range Symbol VOS IOS IB PSRR CMRR AV VO low VO high 60 60 10 75 83 25 0.1 4.9 0.2 4.8 Min 2702A DA Typ Max 2.0 8.0 10.0 60 60 10 75 83 25 0.1 4.9 0.2 4.8 Min 2702B DA Typ Max 4.0 8.0 10.0 60 60 7 75 83 25 0.1 4.9 0.2 Min 2702 DA Typ Max 7.0 8.0 10.0 Unit mV nA nA dB dB V/mV V RS 100K RS 100K RL 10K RL 10K Test Conditions RS 100K 4.8 ALD2702A/ALD2702B ALD2702 Advanced Linear Devices 3 Design & Operating Notes: 1. The ALD2702 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. The ALD2702 is internally compensated for unity gain stability using a novel scheme. This design 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 ALD2702 will typically drive 400pF of external load capacitance without stability problems. In the inverting unity gain configuration, it can drive up to 800pF of load capacitance. Compared to other CMOS operational amplifiers, the ALD2702 has shown itself to be more resistant to parasitic oscillations. 2. The ALD2702 has complementary p-channel and n-channel input differential stages connected in parallel to accomplish rail-to-rail input common mode voltage range. With the 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. As offset voltage trimming on the ALD2702 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 greater than 2.5 (5V operation), where the common mode voltage does not make excursions below this switching point. 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. 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 the ALD2702 an effective analog signal buffer for medium to high source impedance sensors, transducers, and other circuit networks. 5. The ALD2702 operational amplifier has been designed with 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. 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. Alternatively, a 100K or higher value resistor at the input terminals will limit input currents to acceptable levels while causing very small or negligible accuracy effects. TYPICAL PERFORMANCE CHARACTERISTICS COMMON MODE INPUT VOLTAGE RANGE AS A FUNCTION OF SUPPLY VOLTAGE 7 COMMON MODE INPUT VOLTAGE RANGE (V) OPEN LOOP VOLTAGE GAIN AS A FUNCTION OF SUPPLY VOLTAGE AND TEMPERATURE 1000 5 4 3 2 1 0 0 1 2 3 4 5 6 7 OPEN LOOP VOLTAGE GAIN (V/mV) 6 TA = 25C } -55C } +25C 100 } +125C 10 RL= 10K RL= 5K 1 0 2 4 SUPPLY VOLTAGE (V) 6 8 SUPPLY VOLTAGE (V) INPUT BIAS CURRENT AS A FUNCTION OF AMBIENT TEMPERATURE 10000 INPUT BIAS CURRENT (pA) 6 SUPPLY CURRENT AS A FUNCTION OF SUPPLY VOLTAGE SUPPLY CURRENT (mA) 5 4 3 2 1 0 INPUTS GROUNDED OUTPUTS UNLOADED TA = -55C -25C +25C +80C +125C 1000 100 VS = 2.5V 10 1.0 0.1 -50 -25 0 25 50 75 100 125 1 2 3 4 5 6 AMBIENT TEMPERATURE (C) SUPPLY VOLTAGE (V) ALD2702A/ALD2702B ALD2702 Advanced Linear Devices 4 TYPICAL PERFORMANCE CHARACTERISTICS OUTPUT VOLTAGE SWING AS A FUNCTION OF SUPPLY VOLTAGE 120 25C TA 125C RL = 10K RL = 10K OPEN LOOP VOLTAGE GAIN AS A FUNCTION OF FREQUENCY 100 80 60 40 20 0 0 45 90 135 180 1 10 100 1K 10K 100K 1M 10M VS = 2.5V TA = 25C 7 OUTPUT VOLTAGE SWING (V) 5 4 3 2 0 1 2 RL = 2K OPEN LOOP VOLTAGE GAIN (dB) 6 PHASE SHIFT IN DEGREES -20 3 4 5 6 7 SUPPLY VOLTAGE (V) FREQUENCY (Hz) INPUT OFFSET VOLTAGE AS A FUNCTION OF AMBIENT TEMPERATURE REPRESENTATIVE UNITS INPUT OFFSET VOLTAGE (mV) VS = 2.5V INPUT OFFSET VOLTAGE AS A FUNCTION OF COMMON MODE INPUT VOLTAGE 15 INPUT OFFSET VOLTAGE (mV) +5 +4 +3 +2 +1 0 -1 -2 -3 -4 -5 -50 -25 0 +25 +50 10 5 0 -5 -10 -15 VS = 2.5V TA = 25C +75 +100 +125 -2 -1 0 +1 +2 +3 AMBIENT TEMPERATURE (C) COMMON MODE INPUT VOLTAGE (V) OPEN LOOP VOLTAGE GAIN AS A FUNCTION OF LOAD RESISTANCE OPEN LOOP VOLTAGE GAIN (V/mV) 1000 VS = 2.5V TA = 25C 100 LARGE - SIGNAL TRANSIENT RESPONSE 5V/div VS = 2.5V TA = 25C RL = 10K CL = 50pF 10 1V/div 1 1K 10K 100K 1000K 2s/div LOAD RESISTANCE () VOLTAGE NOISE DENSITY AS A FUNCTION OF FREQUENCY 150 SMALL - SIGNAL TRANSIENT RESPONSE 100mV/div VS = 2.5V TA = 25C RL = 10K CL = 50pF VOLTAGE NOISE DENSITY (nV/ Hz) 125 100 75 50 25 VS = 2.5V TA = 25C 20mV/div 0 10 100 1K 10K 100K 1000K 2s/div FREQUENCY (Hz) ALD2702A/ALD2702B ALD2702 Advanced Linear Devices 5 TYPICAL APPLICATIONS RAIL-TO-RAIL VOLTAGE FOLLOWER/BUFFER RAIL-TO-RAIL WAVEFORM ~ ZIN = 1012 VIN 0 VIN 5V + 5V 0.1F OUTPUT RL =10K INPUT +5V 0V CL 400pF +5V OUTPUT 0V * See 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. LOW OFFSET SUMMING AMPLIFIER PHOTO DETECTOR CURRENT TO VOLTAGE CONVERTER 50K 10K INPUT 1 INPUT 2 10K GAIN = 5 * Circuit Drives Large Load Capacitance 4000pF + - 2.5V .01F CL = 4000pF OUTPUT +2.5V .01F RF = 5M I PHOTODIODE +2.5V VOUT = I x RF + -2.5V RL = 10K WIEN BRIDGE OSCILLATOR (RAIL-TO -RAIL) SINE WAVE GENERATOR RAIL-TO-RAIL VOLTAGE COMPARATOR +5V + .01F C = .01F R = 10K 1 ~ f= 2RC * See rail to rail waveform ~ 1.6KHz +2.5V OUTPUT -2.5V 10K 10K 10K VIN +5V 50K + 10M 0.1F OUTPUT ALD2702A/ALD2702B ALD2702 Advanced Linear Devices 6 |
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