ADVANCED LINEAR DEVICES, INC. ALD2702A/ALD2702B ALD2702 DUAL 5V RAIL-TO-RAIL PRECISION OPERATIONAL AMPLIFIER GENERAL DESCRIPTION FEATURES 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. • 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 2KΩ load with 5mA drive current • Output short circuit protected • Unity gain bandwidth of 1.5MHz • Slew rate of 1.9V/µs • Low power dissipation 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 5KΩ 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/µs, 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 7µV/°C which eliminates many trim or temperature compensation circuits. For precision applications, the ALD2702 is designed to settle to 0.01% in 8µs. APPLICATIONS ORDERING INFORMATION PIN CONFIGURATION Operating Temperature Range * -55°C to +125°C 0°C to +70°C 0°C to +70°C 8-Pin CERDIP Package 8-Pin Small Outline Package (SOIC) 8-Pin Plastic Dip Package ALD2702A DA ALD2702B DA ALD2702 DA ALD2702A SA ALD2702B SA ALD2702 SA ALD2702A PA ALD2702B PA ALD2702 PA * Contact factory for industrial temperature range • • • • • • • • • • • • • 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 OUT A 1 8 V+ -IN A 2 7 OUT B +IN A 3 6 -IN B V- 4 5 +IN B TOP VIEW DA, PA, SA PACKAGE © 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 -0.3V to V++13.2V ±6.6V 0.3V to V+ +0.3V 600 mW 0°C to +70°C -55°C to +125°C -65°C to +150°C +260°C 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 OPERATING ELECTRICAL CHARACTERISTICS TA = 25 °C VS = ±2.5V unless otherwise specified Min 2702A Typ Symbol Supply Voltage VS V+ Input Offset Voltage VOS Input Offset Current IOS 1.0 20 240 1.0 20 240 Input Bias Current IB 1.0 20 300 1.0 20 300 Input Voltage Range VIR Input Resistance RIN Input Offset Voltage Drift TCVOS Power Supply Rejection Ratio PSRR 65 65 83 83 65 65 83 83 63 63 Common Mode Rejection Ratio CMRR 65 65 83 83 65 65 83 83 Large Signal Voltage Gain AV 15 28 100 15 28 100 Output Voltage Range VO low VO high 0.002 4.998 0.01 4.99 VO low VO high -2.44 2.44 -2.40 2.40 ±2.0 4.0 Max Min ±6.0 12.0 ±2.0 4.0 2702B Typ Max Parameter 5.3 +2.8 2702 Typ Unit Test Conditions V V Single Supply 5.0 6.0 mV mV RS ≤ 100KΩ 0°C ≤ TA ≤ +70°C 1.0 20 240 pA pA TA = 25°C 0°C ≤ TA ≤ +70°C 1.0 20 300 pA pA TA = 25°C 0°C ≤ TA ≤ +70°C 5.3 +2.8 V V V+ = +5V VS = ±2.5V ±6.0 ±2.0 12.0 4.0 1.0 1.5 -0.3 -2.8 Min ±6.0 12.0 2.0 3.0 -0.3 -2.8 5.3 +2.8 Max -0.3 -2.8 10 12 10 12 1012 7 7 7 Ω µV/°C RS ≤ 100KΩ 83 83 dB R S ≤ 100KΩ 0°C ≤ TA ≤ +70°C 63 63 83 83 dB RS ≤ 100KΩ 0°C ≤ TA ≤ +70°C 12 28 100 V/mV V/mV RL = 10KΩ RL ≥ 1MΩ V R L = 1MΩ Single supply 0°C ≤ TA ≤ +70°C V V R L = 10KΩ Dual supply 0°C ≤ TA ≤ +70°C 0.002 0.01 4.998 4.99 0.002 4.998 0.01 4.99 -2.44 -2.40 2.44 2.40 -2.44 2.44 -2.40 2.40 8 8 8 mA Output Short Circuit Current ISC Supply Current IS 2.0 3.0 2.0 3.0 2.0 3.0 mA VIN = 0V No Load Power Dissipation PD 10 15.0 10 15.0 10 15.0 mW Both amplifiers VS = ±2.5V Input Capacitance CIN 1 Bandwidth BW 0.7 1.5 0.7 1.5 0.7 1.5 MHz Slew Rate SR 1.1 1.9 1.1 1.9 1.1 1.9 V/µs AV = +1 RL = 10KΩ Rise time tr Overshoot 1 1 pF 0.2 0.2 0.2 µs RL = 10KΩ 10 10 10 % RL = 10KΩ CL = 100pF Factor ALD2702A/ALD2702B ALD2702 Advanced Linear Devices 2 OPERATING ELECTRICAL CHARACTERISTICS (cont'd) T A = 25°C VS = ±2.5V unless otherwise specified Min 2702A Typ Max Min 2702B Typ Max Min 2702 Typ Parameter Symbol Maximum Load Capacitance CL 400 4000 400 4000 400 4000 Input Noise Voltage en 26 26 Input Current Noise in 0.6 Settling Time ts 8.0 3.0 Max Unit Test Conditions pF pF Gain = 1 Gain = 5 26 nV/√H Z f = 1KHZ 0.6 0.6 fA/√HZ f = 10HZ 8.0 3.0 8.0 3.0 µs µs 0.01% 0.1% AV = -1 RL = 5KΩ CL = 50pF TA = 25 °C VS = ±5.0V unless otherwise specified Min 2702A Typ Unit Test Conditions Power Supply Rejection Ratio PSRR 83 83 83 dB RS ≤ 100KΩ Common Mode Rejection Ratio CMRR 83 83 83 dB RS ≤ 100KΩ Large Signal Voltage Gain AV 250 250 250 V/mV RL = 10KΩ Output Voltage Range VO low VO high V RL = 10KΩ Bandwidth BW 1.7 1.7 1.7 MHZ Slew Rate SR 2.8 2.8 2.8 V/µs AV =+1 CL =50pF 2702 DA Typ Max Unit Test Conditions RS ≤ 100KΩ -4.90 4.93 Min -4.8 4.8 -4.90 4.93 Max Min 2702 Typ Symbol 4.8 Max 2702B Typ Parameter -4.8 4.8 -4.90 4.93 Max -4.8 VS = +5.0V -55 °C ≤ TA ≤ +125°C unless otherwise specified Min 2702B DA Typ Max Symbol Input Offset Voltage VOS 2.0 4.0 7.0 mV Input Offset Current IOS 8.0 8.0 8.0 nA Input Bias Current IB 10.0 10.0 10.0 nA Power Supply Rejection Ratio PSRR 60 75 60 75 60 75 dB RS ≤ 100KΩ Common Mode Rejection Ratio CMRR 60 83 60 83 60 83 dB RS ≤ 100KΩ Large Signal Voltage Gain AV 10 25 10 25 7 25 V/mV RL ≤ 10KΩ Output Voltage Range VO low VO high 0.1 4.9 4.8 0.1 4.9 RL ≤ 10KΩ 4.8 0.1 4.9 V 4.8 ALD2702A/ALD2702B ALD2702 Min 2702A DA Typ Max Parameter 0.2 Min 0.2 Advanced Linear Devices 0.2 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 100KΩ 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 OPEN LOOP VOLTAGE GAIN AS A FUNCTION OF SUPPLY VOLTAGE AND TEMPERATURE 1000 ±6 TA = 25°C OPEN LOOP VOLTAGE GAIN (V/mV) COMMON MODE INPUT VOLTAGE RANGE (V) ±7 ±5 ±4 ±3 ±2 } -55°C } +25°C 100 } +125°C 10 RL= 10KΩ RL= 5KΩ ±1 1 0 0 ±1 ±2 ±3 ±4 ±5 ±6 ±7 0 ±2 INPUT BIAS CURRENT AS A FUNCTION OF AMBIENT TEMPERATURE ±8 ±6 SUPPLY CURRENT AS A FUNCTION OF SUPPLY VOLTAGE 6 10000 VS = ± 2.5V 1000 SUPPLY CURRENT (mA) INPUT BIAS CURRENT (pA) ±4 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) 100 10 1.0 INPUTS GROUNDED OUTPUTS UNLOADED 5 4 TA = -55°C 3 -25°C +25°C 2 +80°C +125°C 1 0 0.1 -50 -25 0 25 50 75 100 ±1 125 ALD2702A/ALD2702B ALD2702 ±2 ±3 ±4 ±5 ±6 SUPPLY VOLTAGE (V) AMBIENT TEMPERATURE (°C) Advanced Linear Devices 4 TYPICAL PERFORMANCE CHARACTERISTICS ±7 120 OPEN LOOP VOLTAGE GAIN (dB) ±25°C ≤ TA ≤ 125°C ±6 RL = 10KΩ RL = 10KΩ ±5 ±4 RL = 2KΩ ±3 ±2 VS = ±2.5V TA = 25°C 100 80 60 0 40 45 20 90 0 135 180 -20 0 ±1 ±2 ±3 ±4 ±5 ±6 ±7 1 10 100 SUPPLY VOLTAGE (V) 100K 1M 10M INPUT OFFSET VOLTAGE AS A FUNCTION OF COMMON MODE INPUT VOLTAGE 15 +5 +4 INPUT OFFSET VOLTAGE (mV) INPUT OFFSET VOLTAGE (mV) 10K FREQUENCY (Hz) INPUT OFFSET VOLTAGE AS A FUNCTION OF AMBIENT TEMPERATURE REPRESENTATIVE UNITS VS = ±2.5V +3 +2 +1 0 -1 -2 -3 -4 VS = ±2.5V TA = 25°C 10 5 0 -5 -10 -15 -5 -50 OPEN LOOP VOLTAGE GAIN (V/mV) 1K PHASE SHIFT IN DEGREES OUTPUT VOLTAGE SWING (V) OPEN LOOP VOLTAGE GAIN AS A FUNCTION OF FREQUENCY OUTPUT VOLTAGE SWING AS A FUNCTION OF SUPPLY VOLTAGE -25 0 +25 +50 +75 -2 +100 +125 -1 0 +1 +2 AMBIENT TEMPERATURE (°C) COMMON MODE INPUT VOLTAGE (V) OPEN LOOP VOLTAGE GAIN AS A FUNCTION OF LOAD RESISTANCE LARGE - SIGNAL TRANSIENT RESPONSE +3 1000 5V/div VS = ±2.5V TA = 25°C 100 VS = ±2.5V TA = 25°C RL = 10KΩ CL = 50pF 10 1V/div 2µs/div 1 1K 10K 1000K 100K LOAD RESISTANCE (Ω) SMALL - SIGNAL TRANSIENT RESPONSE VOLTAGE NOISE DENSITY AS A FUNCTION OF FREQUENCY VOLTAGE NOISE DENSITY (nV/ √ Hz) 150 100mV/div 125 VS = ±2.5V TA = 25°C 100 VS = ±2.5V TA = 25°C RL = 10KΩ CL = 50pF 75 50 25 20mV/div 2µs/div 0 10 100 1K 10K 100K 1000K FREQUENCY (Hz) ALD2702A/ALD2702B ALD2702 Advanced Linear Devices 5 TYPICAL APPLICATIONS RAIL-TO-RAIL VOLTAGE FOLLOWER/BUFFER RAIL-TO-RAIL WAVEFORM INPUT 5V ~ 1012Ω ZIN = +5V 0V 0.1µF - VIN CL + +5V OUTPUT 0V OUTPUT RL =10KΩ 400pF 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 PHOTO DETECTOR CURRENT TO VOLTAGE CONVERTER LOW OFFSET SUMMING AMPLIFIER RF = 5M 50K +2.5V 10K INPUT 1 INPUT 2 I .01µF OUTPUT GAIN = 5 +2.5V - 10K .01µF + + CL = 4000pF * Circuit Drives Large Load Capacitance ≤ 4000pF VOUT = I x RF PHOTODIODE -2.5V RL = 10K - 2.5V RAIL-TO-RAIL VOLTAGE COMPARATOR WIEN BRIDGE OSCILLATOR (RAIL-TO -RAIL) SINE WAVE GENERATOR +5V +2.5V - OUTPUT + .01µF C = .01µF 10K -2.5V 0.1µF - +5V 50K 10K OUTPUT + 10K R = 10K 1 f =~ 2πRC VIN 10M ~ 1.6KHz * See rail to rail waveform ALD2702A/ALD2702B ALD2702 Advanced Linear Devices 6