ADVANCED LINEAR DEVICES, INC. ALD2711A/ALD2711B ALD2711 DUAL MICROPOWER PRECISION RAIL-TO-RAIL CMOS OPERATIONAL AMPLIFIER GENERAL DESCRIPTION FEATURES The ALD2711 is a dual monolithic CMOS micropower precision high slew rate operational amplifier intended for a broad range of analog applications using ±1V to ±6V dual power supply systems, as well as +2V to +12V battery operated systems. All device characteristics are specified for +5V single supply or ±2.5V dual supply systems. Typical supply current is 200µA at 5V supply voltage. It is manufactured with Advanced Linear Devices' enhanced ACMOS silicon gate CMOS process. • Designed and characterized for 5V operation • Linear mode operation with input voltages 300mV beyond supply rails • Output voltages to within 2mV of power supply rails when driving a high impedance load • Unity gain stable • Extremely low input bias currents -- 0.01pA • Dual power supply ±1.0V to ±6.0V • Single power supply +2V to +12V • High voltage gain • Output short circuit protected • Unity gain bandwidth of 0.7MHz • Slew rate of 0.7V/µs • Low power dissipation • Symmetrical complementary output drive 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. The ALD2711 has been developed specifically for the +5V single supply or ±1V to ±6V dual supply user. 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 at the positive and negative supply voltages. This feature allows numerous analog serial stages and flexibility in input signal bias levels. Secondly, each device was designed to accommodate mixed applications where digital and analog circuits may operate off the same power supply or battery. Thirdly, the output stage can typically drive up to 50pF capacitive and 10KΩ resistive loads. These features, combined with extremely low input currents, high open loop voltage gain, high useful bandwidth, and slew rate make the ALD2711 a versatile, micropower operational amplifier. The ALD2711 with on-chip offset voltage trimming allows the device to be used without nulling in most applications. The unique characteristics of the ALD2711 are modeled in an available macromodel. 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 -55°C to +125°C 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 ALD 2711A DA ALD 2711B DA ALD 2711 DA ALD 2711A SA ALD 2711B SA ALD 2711 SA ALD 2711A PA ALD 2711B PA ALD 2711 PA 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 * Contact factory for industrial temperature range. © 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 T A = 25 °C VS = ±2.5V unless otherwise specified Min 2711A Typ Supply Voltage VS V+ Input Offset Voltage VOS 0.25 0.6 1.0 0.5 1.0 1.5 0.8 Input Offset Current IOS 0.01 10 280 0.01 10 280 Input Bias Current IB 0.01 10 280 0.01 10 280 Input Voltage Range VIR Input Resistance RIN Input Offset Voltage Drift TCV OS Power Supply Rejection Ratio PSRR 63 63 90 90 63 63 90 90 60 60 Common Mode Rejection Ratio CMRR 63 63 90 90 63 63 90 90 Large Signal Voltage Gain AV 15 100 300 15 100 300 -0.3 -2.8 Min ±6.3 12.6 ±1.0 2.0 5.3 2.8 VO low VO high VO low VO high 4.99 2.40 -0.3 -2.8 5.3 2.8 ±1.0 2.0 1.5 2.0 mV mV RS ≤ 100KΩ 0°C ≤ TA ≤ +70°C 0.01 10 280 pA pA TA = 25°C 0°C ≤ TA ≤ +70°C 0.01 10 280 pA pA TA = 25°C 0°C ≤ TA ≤ +70°C 5.3 2.8 V V V+ = +5V VS = ±2.5V -0.3 -2.8 5 5 7 0.01 -2.40 1 Ω µV/°C RS ≤ 100KΩ 90 90 dB dB RS ≤ 100KΩ 0°C ≤ TA ≤ +70°C 60 60 90 90 dB dB RS ≤ 100KΩ 0°C ≤ TA ≤ +70°C 10 100 300 V/mV V/mV V/mV RL = 100KΩ RL ≥ 1MΩ RL = 100KΩ 0°C ≤ TA ≤ +70°C V V V V RL = 1MΩ V+ = +5V 0°C ≤ TA ≤ +70°C RL = 100KΩ 0°C ≤ TA ≤ +70°C 7 0.001 0.01 4.99 4.999 -2.48 -2.40 2.40 2.48 0.001 0.01 4.99 4.999 -2.48 -2.40 2.40 2.48 1 1 mA Output Short Circuit Current ISC Supply Current IS 200 450 200 450 200 450 µA Power Dissipation PD 1.0 0.25 2.25 0.6 1.0 0.25 2.25 0.6 1.0 0.25 2.25 0.6 mW ALD2711A/ALD2711B ALD2711 Test Conditions Dual Supply Single Supply 10 13 0.001 4.999 -2.48 2.48 Unit V V 1013 10 Max ±6.0 12.6 1013 10 Output Voltage Range ±6.3 12.6 Min 2711 Typ Symbol ±1.0 2.0 Max 2711B Typ Max Parameter Advanced Linear Devices VIN = 0V No Load VS = ±2.5V Both VS = ±1.0V amplifiers 2 OPERATING ELECTRICAL CHARACTERISTICS (cont'd) T A = 25°C VS = ±2.5V unless otherwise specified Min 2711A Typ Min Max Min 2711 Typ Symbol Input Capacitance CIN 1 1 1 Bandwidth BW 700 700 700 KHz Slew Rate SR 0.7 0.7 0.7 V/µs AV = +1 RL = 100KΩ Rise time tr 0.2 0.2 0.2 µs RL = 100KΩ 20 20 20 % RL = 100KΩ CL = 50pF Overshoot Factor Max 2711B Typ Parameter Max Unit Test Conditions pF Settling Time ts 10.0 10.0 10.0 µs 0.1% AV = 100 RL = 100KΩ CL = 50pF Channel Separation CS 140 140 140 dB AV = 100 T A = 25 °C VS = ±5.0V unless otherwise specified Min 2711A Typ Unit Test Conditions Power Supply Rejection Ratio PSRR 100 100 100 dB RS ≤ 100KΩ Common Mode Rejection Ratio CMRR 100 100 100 dB RS ≤ 100KΩ Large Signal Voltage Gain AV 300 300 300 V/mV RL = 100KΩ Output Voltage Range VO low VO high V V RL = 100KΩ Bandwidth BW 1.0 1.0 1.0 MHz Slew Rate SR 1.0 1.0 1.0 V/µs -4.98 4.98 Min -4.90 4.90 -4.98 4.98 Max -4.90 Min 2711 Typ Symbol 4.90 Max 2711B Typ Parameter -4.98 4.90 4.98 Max -4.90 AV = +1 CL = 50pF V S = ±2.5V -55°C ≤ TA ≤ +125°C unless otherwise specified Parameter Symbol Input Offset Voltage VOS Input Offset Current 2711A DA Typ Max Min 2711B DA Typ Max Unit Test Conditions 2.0 2.5 mV RS ≤ 100KΩ IOS 4 4 4 nA Input Bias Current IB 4 4 4 nA Power Supply Rejection Ratio PSRR 60 85 60 85 60 85 dB RS ≤ 100KΩ Common Mode Rejection Ratio CMRR 60 83 60 83 60 83 dB RS ≤ 100KΩ Large Signal Voltage Gain AV 10 50 10 50 10 50 V/mV RL ≤ 100KΩ Output Voltage Range VO low VO high 2.35 -2.47 2.45 2.35 -2.47 2.45 2.35 -2.47 2.45 V V RL ≤ 100KΩ -2.40 Min 2711 DA Typ Max 1.5 ALD2711A/ALD2711B ALD2711 Min -2.40 Advanced Linear Devices -2.40 3 Design & Operating Notes: 1. The ALD2711 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 ALD2711 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 ALD2711 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 ALD2711 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 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 ALD2711 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 ALD2711, 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 0.2°C above ambient temperature under most operating conditions. TYPICAL PERFORMANCE CHARACTERISTICS ±7 +25°C INPUTS GROUNDED OUTPUT UNLOADED 500 COMMON MODE INPUT VOLTAGE RANGE AS A FUNCTION OF SUPPLY VOLTAGE ±6 -25°C COMMON MODE INPUT VOLTAGE RANGE (V) SUPPLY CURRENT (µA) SUPPLY CURRENT AS A FUNCTION OF SUPPLY VOLTAGE TA = -55°C 400 300 +70°C +125°C 200 0 ±5 ±4 ±3 ±2 ±1 0 0 ±1 ±2 ±3 ±4 SUPPLY VOLTAGE (V) ±5 ±6 ±2 ±3 ±4 ±5 ±6 ±7 SUPPLY VOLTAGE (V) INPUT BIAS CURRENT AS A FUNCTION OF AMBIENT TEMPERATURE 1000 10 VS = ±2.5V TA = 25°C INPUT BIAS CURRENT (pA) 1000 100 1 10K ±1 0 OPEN LOOP VOLTAGE GAIN AS A FUNCTION OF LOAD RESISTANCE OPEN LOOP VOLTAGE GAIN (V/mV) TA = 25°C VS = ±2.5V 100 10 1.0 0.1 0.01 100K 1M 10M -50 LOAD RESISTANCE (Ω) ALD2711A/ALD2711B ALD2711 -25 0 25 50 75 100 125 AMBIENT TEMPERATURE (°C) Advanced Linear Devices 4 TYPICAL PERFORMANCE CHARACTERISTICS OPEN LOOP VOLTAGE GAIN AS A FUNCTION OF SUPPLY VOLTAGE AND TEMPERATURE OUTPUT VOLTAGE SWING (V) OPEN LOOP VOLTAGE GAIN (V/mV) 1000 OUTPUT VOLTAGE SWING AS A FUNCTION OF SUPPLY VOLTAGE 100 10 -55°C ≤ TA ≤ +125°C RL = 100KΩ +25°C ≤ TA ≤ +125°C RL = 100KΩ ±5 ±4 ±3 ±2 ±1 1 ±2 0 ±4 ±8 ±6 0 ±1 ±3 ±4 ±5 ±6 ±7 SUPPLY VOLTAGE (V) INPUT OFFSET VOLTAGE AS A FUNCTION OF AMBIENT TEMPERATURE REPRESENTATIVE UNITS OPEN LOOP VOLTAGE 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 = 25°C 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 INPUT OFFSET VOLTAGE (mV) ±2 SUPPLY VOLTAGE (V) 100 1K 10K 100K FREQUENCY (Hz) 1M PHASE SHIFT IN DEGREES INPUT OFFSET VOLTAGE (mV) ±6 10M LARGE - SIGNAL TRANSIENT RESPONSE 15 VS = ±2.5V TA = 25°C 10 2V/div VS = ±1.0V TA = 25°C RL = 100KΩ CL = 50pF 500mV/div 5µs/div 5 0 -5 -10 -15 -2 -1 0 +1 +2 +3 COMMON MODE INPUT VOLTAGE (V) SMALL - SIGNAL TRANSIENT RESPONSE LARGE - SIGNAL TRANSIENT RESPONSE 5V/div VS = ±2.5V TA = 25°C RL = 100KΩ CL = 50pF 100mV/div VS = ±2.5V TA = 25°C RL = 100KΩ CL = 50pF 2V/div 5µs/div 20mV/div 2µs/div ALD2711A/ALD2711B ALD2711 Advanced Linear Devices 5 TYPICAL APPLICATIONS RAIL-TO-RAIL VOLTAGE FOLLOWER/BUFFER RAIL-TO-RAIL WAVEFORM INPUT 5V ~ 1013Ω ZIN = 0V 0.1µF - +5V OUTPUT 0V OUTPUT + VIN 0≤ VIN ≤ 5V +5V 1/2 ALD2711 Performance waveforms. Upper trace is the output of a Wien Bridge Oscillator. Lower trace is the output of Rail-to-Rail voltage follower. * See Rail-to-Rail Waveform RAIL-TO-RAIL WINDOW COMPARATOR HIGH INPUT IMPEDANCE RAIL-TO-RAIL PRECISION DC SUMMING AMPLIFIER +5V 8 V+ = +2.5V V1 V2 10M VREF (HIGH) 3 100K + 10M 0.1µF 1/2 ALD2711 2 VOUT 10M - 10M 5 V- ≤ VIN ≤ V+ V3 V4 VOUT = V1 + V2 - V3 - V4 1 1/4 74 C00 - + 7 V- ≤ VOUT ≤ V+ V- = - 2.5V 10M 1/2 ALD2711 VOUT VIN 0.1µF + VREF (LOW) 6 - 100K 10M 4 1/2 ALD2711 RIN = 10MΩ Accuracy limited by resistor tolerances and input offset voltage VOUT (LOW) FOR VREF (LOW) < VIN < VREF(HIGH) WIEN BRIDGE OSCILLATOR (RAIL-TO-RAIL) SINE WAVE GENERATOR 1/2 ALD2711 PHOTO DETECTOR CURRENT TO VOLTAGE CONVERTER RF = 5M +2.5V VOUT + I 10K -2.5V - PHOTODIODE C = .01µF .01µF R = 10K ~ f= 1 10K + 10K ~ 1.6KHZ = +2.5V VOUT = I X RF RL = 100K -2.5V 1/2 ALD2711 2πRC * See Rail-to-Rail Waveform LOW VOLTAGE INSTRUMENTATION AMPLIFIER V+ 0.1µF 1M + 100K 500K 1/2 ALD2711 - 100K V- 0.1µF f max = 20KHz -40mV ≤ VIN ≤ 40mV V+ V+ 0.1µF + 50K VOUT V+ 1M - 0.1µF - 1/2 ALD2711 V- 100K 1/2 ALD2711 0.1µF V- 100K 1M + 1M ALD2711A/ALD2711B ALD2711 V- 0.1µF GAIN = 25 V- ≤ VOUT ≤ V+ All resistors are 1% V+ = +1.0V V- = -1.0V Short Circuit Input Current 1µA Advanced Linear Devices 6