ADVANCED LINEAR DEVICES, INC. ALD1712A/ALD1712B ALD1712 RAIL-TO-RAIL PRECISION OPERATIONAL AMPLIFIER GENERAL DESCRIPTION FEATURES The ALD1712 is a monolithic precision 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 +6V 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 and is available as a standard cell in ALD's ASIC "Function-Specific" library. • Linear mode operation with input voltages 300mV beyond supply rails • Symmetrical complementary output drive • Output voltages to within 2mV of power supply rails • High load capacitance capability -4000pF typical • No frequency compensation required -unity gain stable • Extremely low input bias currents -0.01pA typical • Dual power supply ±2.5V to ±6.0V • Single power supply +5V to +12V • High voltage gain – typically 85V/mV @ ±2.5V and 250V/mV @ ±5.0V • Drive as low as 1KΩ load with 5mA drive current • Output short circuit protected • Unity gain bandwidth of 1.5MHz • Slew rate of 2.1V/µs 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 ALD1712 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 1KΩ resistive loads in non-inverting unity gain connection, and up to 4000pF at a gain of 5. 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 ALD1712 a truly versatile, user friendly, operational amplifier. 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 5µV/ °C which eliminates many trim or temperature compensation circuits. For precision applications, the 1712 is designed to settle to 0.01% in 8µs. The unique characteristics at input and output are modeled in an available macromodel. 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 1712A DA ALD 1712B DA ALD 1712 DA ALD 1712 ASA ALD 1712 BSA ALD 1712 SA ALD 1712A PA ALD 1712B PA ALD 1712 PA * Contact factory for industrial temperature range • • • • • • • • • • • • • • 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 8 N/C 7 VS 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 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 T A = 25 °C VS = ±2.5V unless otherwise specified Min 1712A Typ Supply Voltage VS V+ Input Offset Voltage VOS 0.05 0.15 0.35 0.1 0.25 0.55 0.25 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 65 65 85 85 65 65 85 85 63 63 Common Mode Rejection Ratio CMRR 65 65 83 83 65 65 83 83 Large Signal Voltage Gain AV 50 85 400 50 85 400 -0.3 -2.8 Min ±6.0 12.0 ±2.0 4.0 5.3 +2.8 VO low VO high VO low VO high 4.99 2.35 ±6.0 ±2.0 12.0 4.0 -0.3 -2.8 5.3 +2.8 0.5 1.0 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+ = +5; notes 2,5 VS = ±2.5V -0.3 -2.8 5 5 5 Ω µV/°C RS ≤ 100KΩ 85 85 dB dB RS ≤ 100KΩ 0°C ≤ TA ≤ +70°C 63 63 83 83 dB dB RS ≤ 100KΩ 0°C ≤ TA ≤ +70°C 50 85 400 V/mV V/mV V/mV RL = 10KΩ RL ≥ 1MΩ RL = 10KΩ 0°C ≤ TA ≤ +70°C V V V V RL = 1MΩ V+ = +5V 0°C ≤ TA ≤ +70°C RL = 10KΩ 0°C ≤ TA ≤ +70°C 20 0.002 0.01 0.002 0.01 4.99 4.998 4.99 4.998 -2.44 -2.35 -2.44 -2.35 2.35 2.44 2.35 2.44 8 Test Conditions Single Supply 10 13 0.002 0.01 4.998 -2.44 -2.35 2.44 Unit V 1013 20 Max ±6.0 12.0 1013 20 Output Voltage Range Min 1712 Typ Symbol ±2.0 4.0 Max 1712B Typ Max Parameter 8 8 mA Output Short Circuit Current ISC Supply Current IS 0.8 1.5 0.8 1.5 0.8 1.5 mA VIN = 0V No Load Power Dissipation PD 4.0 7.5 4.0 7.5 4.0 7.5 mW VS = ±2.5V Input Capacitance CIN Bandwidth BW 1.0 1.5 1.0 1.5 1.0 1.5 MHz Slew Rate SR 1.4 2.1 1.4 2.1 1.4 2.1 V/µs AV = +1 RL = 10KΩ Rise time tr Overshoot Factor ALD1712A/ALD1712B ALD1712 1 1 1 pF 0.2 0.2 0.2 µs RL = 10KΩ 10 10 10 % RL = 10KΩ CL = 100pF Advanced Linear Devices 2 OPERATING ELECTRICAL CHARACTERISTICS (cont'd) TA = 25°C VS = ±2.5V unless otherwise specified 1712A Typ Max Min Typ 1712 Symbol Maximum Load Capacitance CL 400 4000 400 4000 400 4000 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 ts 8.0 3.0 8.0 3.0 8.0 3.0 µs µs 0.01% 0.1% AV = -1 RL = 5KΩ CL = 50pF Unit Test Conditions Settling Time Min 1712B Parameter Max Min Typ Max Unit Test Conditions pF pF Gain = 1 Gain = 5 TA = 25 °C VS = ±5.0V unless otherwise specified Min 1712A Typ 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 -4.90 4.93 Min -4.80 4.80 -4.90 4.93 Max -4.80 Min 1712 Typ Symbol 4.80 Max 1712B Typ Parameter -4.90 4.80 4.93 Max -4.80 AV =+1 CL =50pF V S = ±2.5V -55°C ≤ TA ≤ +125°C unless otherwise specified VOS Input Offset Current IOS 4.0 Input Bias Current IB 4.0 Power Supply Rejection Ratio PSRR 60 83 60 83 60 83 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 10 25 V/mV RL = 10KΩ Output Voltage Range VO low VO high 4.8 0.1 4.9 4.8 0.1 4.9 4.8 0.1 4.9 V V RL ≤ 10KΩ RL ≤ 10KΩ 1.0 0.8 0.2 Min 1712 DA Typ Max Input Offset Voltage 0.5 Min 1712B DA Typ Max Symbol ALD1712A/ALD1712B ALD1712 Min 1712A DA Typ Max Parameter Unit Test Conditions 2.5 mV RS ≤ 100KΩ 4.0 4.0 nA 4.0 4.0 nA 1.5 1.2 0.2 Advanced Linear Devices 0.2 3 Design & Operating Notes: 1. The ALD1712 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 ALD1712 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 ALD1712 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 ALD1712 has shown itself to be more resistant to parasitic oscillations. 2. The ALD1712 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 1712 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 ALD1712 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 ±6 TA = 25°C OPEN LOOP VOLTAGE GAIN (V/mV) COMMON MODE INPUT VOLTAGE RANGE (V) ±7 ±5 ±4 ±3 ±2 } +25°C 100 } +125°C 10 ±1 RL= 10KΩ RL= 5KΩ 0 1 ±1 0 ±2 ±3 ±4 ±5 ±6 ±7 ±2 0 ±4 ±6 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) INPUT BIAS CURRENT AS A FUNCTION OF AMBIENT TEMPERATURE SUPPLY CURRENT AS A FUNCTION OF SUPPLY VOLTAGE 5 1000 VS = ±2.5V 100 SUPPLY CURRENT (mA) INPUT BIAS CURRENT (pA) } -55°C 10 1.0 0.1 INPUTS GROUNDED OUTPUT UNLOADED 4 3 2 TA = -55°C -25°C 1 +25°C +80°C +125°C 0 0.01 -50 -25 0 25 50 75 100 125 0 AMBIENT TEMPERATURE (°C) ALD1712A/ALD1712B ALD1712 ±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 ±5 RL = 10KΩ ±4 RL = 2KΩ ±3 ±2 100 VS = ±2.5V TA = 25°C 80 60 0 40 45 20 90 0 135 180 -20 0 ±1 ±2 ±3 ±4 ±5 ±6 1 ±7 10 100 INPUT OFFSET VOLTAGE AS A FUNCTION OF AMBIENT TEMPERATURE REPRESENTATIVE UNITS 100K 1M 10M INPUT OFFSET VOLTAGE AS A FUNCTION OF COMMON MODE INPUT VOLTAGE INPUT OFFSET VOLTAGE (mV) INPUT OFFSET VOLTAGE (mV) 10K FREQUENCY (Hz) SUPPLY VOLTAGE (V) +5 +4 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 6 VS = ±2.5V TA = 25°C 4 2 0 -2 -4 -6 -5 -50 -25 0 +25 +50 +75 +100 +125 -2 -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 OPEN LOOP VOLTAGE GAIN (V/mV) 5V/div VS = ±2.5V TA = 25°C RL = 10KΩ CL = 50pF 100 VS = ±2.5V TA = 25°C 10 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) ALD1712A/ALD1712B ALD1712 Advanced Linear Devices 5 TYPICAL APPLICATIONS RAIL-TO-RAIL VOLTAGE FOLLOWER/BUFFER RAIL-TO-RAIL WAVEFORM 5V ZIN =~ 1012Ω 0.1µF INPUT VIN 0V OUTPUT CL + +5V +5V OUTPUT 0V RL =10KΩ 400pF 0 ≤ VIN ≤ 5V Performance waveforms. * See rail to rail waveform Upper trace is the output of a Wien Bridge Oscillator. Lower trace is the output of Railto-Rail voltage follower. LOW OFFSET SUMMING AMPLIFIER PHOTO DETECTOR CURRENT TO VOLTAGE CONVERTER RF = 5M 50K +2.5V 10K INPUT 1 INPUT 2 .01µF I 10K .01µF + + CL = 4000pF * Circuit Drives Large Load Capacitance ≤ 4000pF RL = 10K RAIL-TO-RAIL VOLTAGE COMPARATOR +5V +2.5V - OUTPUT + VIN 10K -2.5V .01µF +5V OUTPUT 1 + 50K 10K 2πRC 0.1µF - 10K R = 10K f =~ -2.5V - 2.5V WIEN BRIDGE OSCILLATOR (RAIL-TO-RAIL) SINE WAVE GENERATOR C = .01µF VOUT = I x RF PHOTODIODE OUTPUT GAIN = 5 +2.5V - - ~ 1.6KHz 10M * See rail to rail waveform ULTRA LONG TIME CONSTANT INTEGRATOR INTEGRATOR VOLTAGE PRESET 20K 20K 5V Relay 1 2 R 7 - t2 + 3 + 5V 4 6 t1 1/2 ALD2301 0.1 -5 V * LOW LEAKAGE CAPACITOR e.g. TEFLON CAPACITOR TYPE K11B104KSW Component Research Inc. • All capacitance values are in µF unless otherwise specified. • RELAYS 1 & 2 are of type 4705, Gordos Corporation. ALD1712A/ALD1712B ALD1712 1.5V VIN = dt ALD1712 3 8 0.1 V = 1/RC Control 1 - 1 +5V Relay 2 VIN 1/2 ALD2301 5V 2 C* Advanced Linear Devices - 7 4 + Control 2 6 5 1.5V 6