ADVANCED LINEAR DEVICES, INC. ALD1702A/ALD1702B ALD1702/ALD1703 5V RAIL-TO-RAIL PRECISION OPERATIONAL AMPLIFIER GENERAL DESCRIPTION FEATURES The ALD1702/ALD1703 is a 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. It is manufactured with Advanced Linear Devices' enhanced ACMOS silicon gate CMOS process. • Rail-to-rail input and output voltage ranges • All parameters specified for +5V single supply or ±2.5V dual supply systems. • High load capacitance capability -4000pF typical • No frequency compensation required -unity gain stable • Extremely low input bias currents -1.0pA typical (30pA max.) • Ideal for high source impedance applications • Dual power supply ±2.5V to ±5.0V 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 (1.0MHz min.) • Slew rate of 2.1V/µs (1.4V/µs min.) • Low power dissipation The device is designed to offer a balanced trade-off of performance parameters providing a wide range of desired specifications. It offers the industry pin configuration of µA741 and ICL7611 types. The ALD1702/ALD1703 has been developed specifically with the 5V single supply or ±2.5 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, slew rate of 2.1V/µs, low power dissipation, low offset voltage and temperature drift, make the ALD1702/ ALD1703 a truly versatile, user friendly, operational amplifier. The ALD1702/ALD1703 is designed and fabricated with silicon gate CMOS technology, and offers 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 ALD1702 is designed to settle to 0.01% in 8µs. • • • • • • • • • • • • • • Voltage amplifier 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 PIN CONFIGURATION ORDERING INFORMATION -55°C to +125°C APPLICATIONS Operating Temperature Range 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 ALD1702A DA ALD1702B DA ALD1702 DA ALD1703 DA ALD1702A SA ALD1702B SA ALD1702 SA ALD1703 SA ALD1702A PA ALD1702B PA ALD1702 PA ALD1703 PA * Contact factory for industrial temperature range 8 N/C 7 V+ 3 6 OUT 4 5 N/C N/C 1 -IN 2 +IN V- 2 TOP VIEW DA, PA, SA PACKAGE * N/C Pin is internally connected. Do not connect externally. © 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+ Differential input voltage range Power dissipation Operating temperature range PA, SA package DA package Storage temperature range Lead temperature, 10 seconds 13.2V -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 OPERATING ELECTRICAL CHARACTERISTICS TA = 25°C VS = ±2.5V unless otherwise specified 1702A Typ Max Min ±6.0 12.0 ±2.0 4.0 1702 Typ Max Symbol Min Supply Voltage VS V+ Input Offset Voltage VOS Input Offset Current IOS 1.0 25 240 1.0 25 240 1.0 25 240 Input Bias Current IB 1.0 30 300 1.0 30 300 1.0 30 300 Input Voltage Range VIR Input Resistance RIN Input Offset Voltage Drift TCVOS ±2.0 4.0 ±6.0 12.0 Min 1702B Typ Max Parameter ±2.0 4.0 0.9 1.7 -0.3 -2.8 5.3 2.8 ±6.0 12.0 2.0 2.8 -0.3 -2.8 5.3 2.8 Min 1703 Typ ±2.0 4.0 5.3 2.8 Unit Test Conditions ±6.0 12.0 V Single Supply 10.0 11.0 mV mV RS ≤ 100KΩ 0°C ≤ TA ≤ +70°C 1.0 30 450 pA pA TA = 25°C 0°C ≤ TA ≤ +70°C 1.0 50 600 pA pA TA = 25°C 0°C ≤ TA ≤ +70°C 4.85 2.35 V V V+ = +5V VS = ±2.5V 4.5 5.3 -0.3 -2.8 Max 0.15 -2.35 Ω 1012 1012 1012 1012 7 7 7 10 µV/°C RS ≤ 100KΩ Power Supply PSRR Rejection Ratio 70 70 80 80 65 65 80 80 65 65 80 80 60 60 80 80 dB dB R S ≤ 100KΩ 0°C ≤ TA ≤ +70°C Common Mode CMRR Rejection Ratio 70 70 83 83 65 65 83 83 65 65 83 83 60 60 83 83 dB dB RS ≤100KΩ 0°C ≤ TA ≤ +70°C Large Signal Voltage Gain 50 85 400 50 85 400 50 85 400 32 85 300 V/mV V/mV V/mV RL =10KΩ RL ≥1MΩ RL =10KΩ 0°C ≤ TA ≤ +70°C V V V R L =1MΩ V+ = 5V 0°C ≤ TA ≤ +70°C R L =10KΩ 0°C ≤ TA ≤ +70°C AV 20 Output Voltage Range VO low VO high VO low VO high 20 0.002 4.99 4.998 -2.44 2.35 2.44 0.01 4.99 -2.35 2.35 8 Output Short ISC Circuit Current 20 0.002 0.01 4.998 -2.44 -2.35 2.44 4.99 2.35 8 10 0.002 0.01 4.998 -2.44 -2.35 2.44 4.99 2.3 8 0.002 4.998 -2.4 2.4 0.01 -2.3 8 mA Supply Current IS 1.1 2.0 1.1 2.0 1.1 2.0 1.1 2.5 mA VIN = 0V No Load Power Dissipation PD 5.5 10.0 5.5 10.0 5.5 10.0 5.5 12.5 mW VS = ±2.5V Input Capacitance CIN Bandwidth BW 1.0 1.5 1.0 1.5 1.0 1.5 0.7 1.5 MHz Slew Rate SR 1.4 2.1 1.4 2.1 1.4 2.1 1.1 2.1 V/µs AV = +1 RL = 10KΩ Rise time tr 0.2 µs RL = 10KΩ CL = 100pF ALD1702A/ALD1702B ALD1702/ALD1703 1 0.2 1 0.2 1 0.2 Advanced Linear Devices 1 pF 2 OPERATING ELECTRICAL CHARACTERISTICS (cont'd) T A = 25°C VS = ±2.5V unless otherwise specified Parameter Symbol Min Overshoot Factor 1702A Typ Max 1702B Typ Max Min Min 1702 Typ Max Min 1703 Typ Max Unit Test Conditions 10 10 10 10 % RL =10KΩ CL = 100pF pF pF Gain = 1 Gain = 5 Maximum Load Capacitance CL 400 4000 400 4000 400 4000 400 4000 Input Noise Voltage en 26 26 26 26 nV/√Hz f =1KHz Input Current Noise in 0.6 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 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 1702A Typ Max 1702B Typ Max Min Min 1702 Typ Unit Test Conditions 83 dB RS ≤ 100KΩ 83 83 dB RS ≤ 100KΩ 250 250 V/mV RL =10KΩ V RL =10KΩ Parameter Symbol Power Supply PSRR 83 83 83 Common Mode CMRR 83 83 250 250 Max Min 1703 Typ Max Rejection Ratio Rejection Ratio Large Signal Voltage Gain AV Output Voltage VO low Range VO high 4.8 -4.9 4.93 -4.8 4.8 -4.9 4.93 -4.8 4.8 -4.9 4.93 -4.8 4.8 -4.9 4.93 -4.8 Bandwidth BW 1.7 1.7 1.7 1.7 MHz Slew Rate SR 2.8 2.8 2.8 2.8 V/µs AV = +1 CL = 50pF V S = ±2.5V -55°C ≤ T A ≤ +125°C unless otherwise specified Min 1702A DA Typ Max Parameter Symbol Input Offset Voltage VOS 3.0 Input Offset IOS Min 1702B DA Typ Max 1702 DA Typ Min Max Unit 4.0 6.5 mV 8.0 8.0 8.0 nA 10.0 10.0 10.0 nA Test Conditions RS ≤ 100KΩ Current Input Bias Current IB 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 ALD1702A/ALD1702B ALD1702/ALD1703 0.2 0.2 Advanced Linear Devices 0.2 3 Design & Operating Notes: 1. The ALD1702/ALD1703 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 ALD1702 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 ALD1702 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 ALD1702 has shown itself to be more resistant to parasitic oscillations. 2. The ALD1702/ALD1703 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 above the negative supply voltage. Since offset voltage trimming on the ALD1702/ALD1703 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 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 1012Ω 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 ALD1702/ALD1703 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. 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 TA = 25°C ±6 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 ±1 RL= 10KΩ RL= 5KΩ 0 1 0 ±1 ±2 ±3 ±4 ±5 ±6 ±7 ±2 0 SUPPLY VOLTAGE (V) INPUT BIAS CURRENT AS A FUNCTION OF AMBIENT TEMPERATURE ±6 ±8 SUPPLY CURRENT AS A FUNCTION OF SUPPLY VOLTAGE ±5 10000 VS = ± 2.5V 1000 SUPPLY CURRENT (mA) INPUT BIAS CURRENT (pA) ±4 SUPPLY VOLTAGE (V) 100 10 1.0 0.1 INPUTS GROUNDED OUTPUT UNLOADED ±4 ±3 ±2 TA = -55ºC -25°C ±1 +25°C +80°C +125°C 0 -50 -25 0 25 50 75 100 125 0 AMBIENT TEMPERATURE (°C) ALD1702A/ALD1702B ALD1702/ALD1703 ±1 ±2 ±3 ±4 ±5 ±6 SUPPLY VOLTAGE (V) 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) 10K 100K 1M 10M FREQUENCY (Hz) INPUT OFFSET VOLTAGE AS A FUNCTION OF AMBIENT TEMPERATURE REPRESENTATIVE UNITS INPUT OFFSET VOLTAGE AS A FUNCTION OF COMMON MODE INPUT VOLTAGE 15 +5 +4 INPUT OFFSET VOLTAGE (mV) INPUT OFFSET VOLTAGE (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 VS = ±2.5V +3 +2 +1 0 -1 -2 -3 -4 5 0 -5 -10 -15 -5 -50 VS = ±2.5V TA = 25°C 10 -25 0 +25 +50 +75 -2 +100 +125 -1 0 +1 +2 +3 COMMON MODE INPUT VOLTAGE (V) AMBIENT TEMPERATURE (°C) OPEN LOOP VOLTAGE GAIN AS A FUNCTION OF LOAD RESISTANCE LARGE - SIGNAL TRANSIENT RESPONSE 1000 OPEN LOOP VOLTAGE GAIN (V/mV) 5V/div VS = ±2.5V TA = 25°C RL = 10KΩ CL = 50pF 100 10 VS = ±2.5V TA = 25°C 1V/div 2µs/div 1 1K 10K 100K 1000K 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) ALD1702A/ALD1702B ALD1702/ALD1703 Advanced Linear Devices 5 TYPICAL APPLICATIONS RAIL TO RAIL VOLTAGE FOLLOWER/BUFFER RAIL-TO-RAIL WAVEFORM INPUT 5V ZIN =~ 1012Ω +5V 0V 0.1µF +5V OUTPUT 0V VIN OUTPUT CL + 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 50K RF = 5M +2.5V 10K INPUT 1 INPUT 2 .01µF I OUTPUT GAIN = 5 CL = 4000pF + +5V OUTPUT + 10K -2.5V 10K .01µF RL = 10K RAIL-TO-RAIL VOLTAGE COMPARATOR +2.5V - VIN 0.1µF - +5V 50K OUTPUT + 10K R = 10K f =~ -2.5V - 2.5V WIEN BRIDGE OSCILLATOR (RAIL-TO -RAIL) SINE WAVE GENERATOR C = .01µF VOUT = I x RF PHOTODIODE .01µF + * Circuit Drives Large Load Capacitance ≤ 4000pF +2.5V - 10K 1 2πRC 10M ~ 1.6KHz * See rail to rail waveform ALD1702A/ALD1702B ALD1702/ALD1703 Advanced Linear Devices 6