ADVANCED LINEAR DEVICES, INC. ALD1706A/ALD1706B ALD1706/ALD1706G ULTRA MICROPOWER RAIL-TO-RAIL CMOS OPERATIONAL AMPLIFIER GENERAL DESCRIPTION FEATURES The ALD1706 is a monolithic CMOS ultra micropower high slew-rate, high performance 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. Supply current is 40µA maximum at 5V supply voltage. It is manufactured with Advanced Linear Devices' enhanced ACMOS silicon gate CMOS process. • 20µA supply current • All parameters specified for +5V single supply or ± 2.5V dual supply systems • Rail to rail input and output voltage ranges • No frequency compensation required -unity gain stable • Extremely low input bias currents -- 0.1pA typical (30pA max.) • Ideal for high source impedance applications • Dual power supply ±1.0V to ±6.0V operation • Single power supply +2V to +12V operation • High voltage gain – typically 100V/mV @ ±2.5V (100dB) • Drive as low as a 20KΩ load • Output short circuit protected • Unity gain bandwidth of 0.4MHz • Slew rate of 0.17V/µs The ALD1706 is designed to offer high performance for a wide range of applications requiring very low power dissipation. It offers the popular industry standard single operational amplifier pin configuration. The ALD1706 has been developed specifically for the +5V single battery or ±1V to ±6V dual battery user. Several important characteristics of the device make application easier to implement at those voltages. First, the operational amplifier can operate with rail to rail input and output voltages. This means the signal input voltage and output voltage can be close to or equal to the positive and negative supply voltages. This feature allows numerous analog serial stages and flexibility in input signal bias levels. Secondly, the 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 25pF capacitive and 20KΩ resistive loads. These features, combined with extremely low input currents, high open loop voltage gain of 100V/mV, useful bandwidth of 400KHz, a slew rate of 0.17V/µs, low offset voltage and temperature drift, make the ALD1706 a versatile, micropower operational amplifier. The ALD1706, designed and fabricated with silicon gate CMOS technology, offers 0.1pA typical input bias current. On chip offset voltage trimming allows the device to be used without nulling in most applications. APPLICATIONS • • • • • • • • • • • • • 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 PIN CONFIGURATION ORDERING INFORMATION 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 ALD1706A DA ALD1706B DA ALD1706 DA ALD1706A SA ALD1706B SA ALD1706 SA ALD1706A PA ALD1706B PA ALD1706 PA ALD1706G PA * Contact factory for industrial temperature range N/C 1 8 N/C -IN 2 7 V+ +IN 3 6 OUT V- 4 5 N/C TOP VIEW DA, PA, SA PACKAGE * N/C Pin is connected internally. 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 Parameter Symbol Min 1706A Typ Max ±1.0 2.0 ±6.0 12.0 Min 1706B Typ Max Min 1706 Typ Max Min 1706G Typ Max ±6.0 12.0 ±1.0 2.0 ±6.0 12.0 ±1.0 2.0 ±6.0 12.0 V V Dual Supply Single Supply 10.0 11.0 mV mV RS ≤ 100KΩ 0°C ≤ TA ≤ +70°C ±1.0 2.0 Unit Test Conditions Supply Voltage VS V+ Input Offset Voltage VOS Input Offset Current IOS 0.1 25 240 0.1 25 240 0.1 25 240 0.1 30 450 pA pA TA = 25°C 0°C ≤ TA ≤ +70°C Input Bias Current IB 0.1 30 300 0.1 30 300 0.1 30 300 0.1 50 600 pA pA TA = 25°C 0°C ≤ TA ≤ +70°C Input Voltage Range VIR 5.3 2.8 V V V+ = +5V VS = ±2.5V Input Resistance RIN Input Offset Voltage Drift TCVOS 0.9 1.7 -0.3 -2.8 5.3 2.8 2.0 2.8 -0.3 -2.8 5.3 2.8 4.5 5.3 -0.3 -2.8 5.3 2.8 -0.3 -2.8 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 RS ≤ 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 AV 32 20 100 32 20 100 32 20 100 20 10 80 V/ mV V/ mV RL = 1MΩ RL = 1MΩ 0°C ≤ TA ≤ +70°C Output Voltage Range VO low VO high 4.99 VO low VO high 2.30 Output Short Circuit Current ISC Supply Current IS Power Dissipation PD ALD1706A/ALD1706B ALD1706/ALD1706G 0.001 4.999 -2.40 2.40 0.01 4.99 -2.30 2.30 200 20 0.001 0.01 4.999 -2.40 -2.30 2.40 200 40 200 20 4.99 2.30 0.001 0.01 4.999 -2.40 -2.30 2.40 200 40 20 200 Advanced Linear Devices 40 200 4.99 2.30 0.001 0.01 4.999 -2.40 -2.30 2.40 V V V V 200 µA 20 RL =1MΩ 0°C ≤ TA ≤ +70°C R L =100KΩ 0°C ≤ TA ≤ +70°C 50 µA VIN = 0V No Load 250 µW VS = ±2.5V 2 OPERATING ELECTRICAL CHARACTERISTICS (cont'd) TA = 25°C VS = ±2.5V unless otherwise specified Min 1706A Typ Max Min Unit Test Condition 1 1 1 1 Bandwidth BW 400 400 400 400 KHz Slew Rate SR 0.17 0.17 0.17 0.17 V/µs AV = +1 RL = 1MΩ Rise time tr 1.0 1.0 1.0 1.0 µs RL = 1MΩ 20 20 20 20 % RL =1MΩ CL = 25pF 10.0 10.0 10.0 10.0 µs 0.1% AV = -1 RL=1MΩ CL =25pF ts Max 1706G Typ Max CIN Settling Time Min 1706 Typ Symbol Overshoot Factor Min 1706B Typ Max Parameter Input Capacitance pF T A = 25°C VS = ±1.0V unless otherwise specified Parameter Symbol Min 1706A Typ Max Min 1706B Typ Max Min 1706 Typ Max Min 1706G Typ Max Unit Test Condition Power Supply PSRR 70 70 70 70 dB RS ≤ 1MΩ Rejection Ratio CMRR 70 70 70 70 dB RS ≤ 1MΩ Large Signal Voltage Gain AV 50 50 50 50 V/ mV RL =1MΩ V V R L =1MΩ Rejectio Ratio Common Mode Output Voltage Range VO low VO high Bandwidth BW 0.3 0.3 0.3 0.3 MHz Slew Rate SR 0.17 0.17 0.17 0.17 V/µs 0.9 -0.95 0.95 -0.9 0.9 -0.95 0.95 -0.9 0.9 -0.95 0.95 -0.9 0.9 -0.95 0.95 -0.9 AV = +1 CL = 25pF V S = ±2.5V -55°C ≤ TA ≤ +125°C unless otherwise specified 1706B DA Parameter Symbol Input Offset Voltage VOS Input Offset Current IOS Min Typ 1706 DA Max Min Typ Test Max Unit 3.0 6.5 mV 8.0 8.0 nA 10.0 10.0 nA Conditions RS ≤ 100KΩ Input Bias Current IB Power Supply Rejection Ratio PSRR 60 75 60 75 dB RS ≤ 1MΩ Rejection Ratio CMRR 60 83 60 83 dB RS ≤ 1MΩ Large Signal Voltage Gain AV 15 50 V/ mV RL = 1MΩ Output Voltage Range VO low VO high 2.30 -2.40 2.40 V V RL = 1MΩ Common Mode ALD1706A/ALD1706B ALD1706/ALD1706G 15 50 2.30 -2.40 2.40 -2.30 Advanced Linear Devices -2.30 3 Design & Operating Notes: 1. The ALD1706 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 ALD1706 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 ALD1706 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 ALD1706 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 noninverting 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 ALD1706 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 ALD1706, 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 less than 0.1°C above ambient temperature under most operating conditions. TYPICAL PERFORMANCE CHARACTERISTICS SUPPLY CURRENT AS A FUNCTION OF SUPPLY VOLTAGE COMMON MODE INPUT VOLTAGE RANGE AS A FUNCTION OF SUPPLY VOLTAGE ±7 INPUTS GROUNDED OUTPUT UNLOADED -25°C +25°C COMMON MODE INPUT VOLTAGE RANGE (V) SUPPLY CURRENT (µA) 100 80 TA = -55°C 60 40 20 +70°C ±6 TA = 25°C ±5 ±4 ±3 ±2 ±1 +125°C 0 0 0 ±1 ±2 ±3 ±4 ±5 ±6 ±1 0 SUPPLY VOLTAGE (V) ±4 ±5 ±6 ±7 INPUT BIAS CURRENT AS A FUNCTION OF AMBIENT TEMPERATURE 1000 10000 INPUT BIAS CURRENT (pA) OPEN LOOP VOLTAGE GAIN (V/mV) ±3 SUPPLY VOLTAGE (V) OPEN LOOP VOLTAGE GAIN AS AFUNCTION OF LOAD RESISTANCE 100 10 VS = ±2.5V TA = 25°C 1 10K ±2 VS = ±2.5V 1000 100 10 1.0 0.1 100K 1M 10M -50 ALD1706A/ALD1706B ALD1706/ALD1706G -25 0 25 50 75 100 125 AMBIENT TEMPERATURE (°C) LOAD RESISTANCE (Ω) Advanced Linear Devices 4 TYPICAL PERFORMANCE CHARACTERISTICS OPEN LOOP VOLTAGE GAIN AS A FUNCTION OF SUPPLY VOLTAGE AND TEMPERATURE OUTPUT VOLTAGE SWING AS A FUNCTION OF SUPPLY VOLTAGE OUTPUT VOLTAGE SWING (V) OPEN LOOP VOLTAGE GAIN (V/mV) 1000 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 ±6 ±8 0 ±1 ±3 ±4 ±5 ±6 SUPPLY VOLTAGE (V) INPUT OFFSET VOLTAGE AS A FUNCTION OF AMBIENT TEMPERATURE REPRESENTATIVE UNITS OPEN LOOP VOLTAGE GAIN AS A FUNCTION OF FREQUENCY ±7 VS = ±2.5V +3 +2 +1 0 -1 -2 -3 -4 OPEN LOOP VOLTAGE GAIN (dB) 120 +5 +4 -5 -50 VS = ±2.5V TA = 25°C 100 80 60 0 40 45 20 90 0 135 180 -20 -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= 25pF 500mV/div 10µs/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 2V/div ALD1706A/ALD1706B ALD1706/ALD1706G VS = ±2.5V TA = 25°C RL = 100KΩ CL= 25pF 100mV/div 50mV/div 10µs/div Advanced Linear Devices VS = ±2.5V TA = 25°C RL = 100KΩ CL= 25pF 10µs/div 5 TYPICAL APPLICATIONS RAIL-TO-RAIL VOLTAGE FOLLOWER/BUFFER CHARGE INTEGRATOR 1000pF 5V ~ 1012Ω ZIN = 0.1µF - +2.5V 1M VIN OUTPUT VOUT + VIN + -2.5V 0≤ VIN ≤ 5V * See Rail to Rail Waveform HIGH INPUT IMPEDANCE RAIL-TO-RAIL PRECISION DC SUMMING AMPLIFIER RAIL-TO-RAIL VOLTAGE COMPARATOR V+ = +2.5V V1 +5V 10M VIN + 10M +5V VOUT 10M - 10M 0.1µF - 0.1µF V2 0.1µF OUTPUT + 50K V3 V4 10M V- ≤ VOUT ≤ V+ V- = - 2.5V 10M 0 ≤ VIN ≤ V+ 10M VOUT = V1 + V2 - V3 - V4 RIN = 10MΩ Accuracy limited by resistor tolerances and input offset voltage HIGH IMPEDANCE NON-INVERTING AMPLIFIER PHOTO DETECTOR CURRENT TO VOLTAGE CONVERTER RF = 5M 900K 100K I +1V VOUT VIN + RL = 100K + -2.5V -1V WIEN BRIDGE OSCILLATOR MICROPOWER BUFFERED VARIABLE VOLTAGE SOURCE 250K V+ V+ +1.0V VIN VOUT + 0.0015µF C VOUT = 1 X RF +2.5V - PHOTODIODE 2M VOUT + 1µF -1.0V Power Supply = ±1.0V 0.0015µF 100K R C 100K R f≈ 1 2.0V ≤ V+ ≤ 12.0V 0.1 ≤ VOUT ≤ (V+ - 0.1) V OUPUT CURRENT ±200µA ≈ 1.0KHz 2π RC VOUT = SINEWAVE 2V Peak to Peak ALD1706A/ALD1706B ALD1706/ALD1706G Advanced Linear Devices 6