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| ADVANCED LINEAR DEVICES, INC. ALD4702A/ALD4702B ALD4702 QUAD 5V RAIL-TO-RAIL PRECISION OPERATIONAL AMPLIFIER GENERAL DESCRIPTION The ALD4702 is a quad monolithic precision CMOS rail-to-rail operational amplifier intended for a broad range of analog applications using 2.5V to 6V 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. Total supply current for four operational amplifiers is 6mA maximum at 5V supply voltage. It is manufactured with Advanced Linear Devices' enhanced ACMOS silicon gate CMOS process. The ALD4702 is designed to offer a trade-off of performance parameters providing a wide range of desired specifications. It offers the popular industry pin configuration of LM324 and ICL7641 types. The ALD4702 has been developed specifically with the +5V single supply or 2.5V dual supply user. 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 5K 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 2.1V/s, low power dissipation, low offset voltage and temperature drift, make the ALD4702 a truly versatile, user friendly, operational amplifier. The ALD4702 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 7V/ C which eliminates many trim or temperature compensation circuits. For precision applications, the ALD4702 is designed to settle to 0.01% in 8s. FEATURES * Rail-to-rail input and output voltage ranges * Symmetrical push-pull class AB output drivers * All parameters specified for +5V single supply or 2.5V dual supply systems * Inputs can extend beyond supply rails by 300mV * Outputs settle to 2mV of supply rails * High load capacitance capability up to 4000pF * 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 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 2K load with 5mA drive current * Output short circuit protected * Unity gain bandwidth of 1.5MHz * Slew rate of 1.9V/s * Low power dissipation 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 convert Coaxial cable driver PIN CONFIGURATION ORDERING INFORMATION Operating Temperature Range* -55C to +125C 0C to +70C 0C to +70C 14-Pin CERDIP Package ALD4702A DB ALD4702B DB ALD4702 DB 14-Pin Small Outline Package (SOIC) ALD4702A SB ALD4702B SB ALD4702 SB 14-Pin Plastic Dip Package ALD4702A PB ALD4702B PB ALD4702 PB OUT A -IN A 1 2 14 13 12 11 10 9 8 OUT D -IN D +IN D V+IN C -IN C OUT C +IN A 3 V+ 4 +IN B 5 -IN B OUT B 6 7 * Contact factory for industrial temperature range DB, PB, SB Package (c) 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+ referenced to VSupply voltage, VS referenced to VDifferential input voltage range Power dissipation Operating temperature range PB, SB package DB package Storage temperature range Lead temperature, 10 seconds -0.3V to V++13.2V 6.6V -0.3V to V+ +0.3V 600 mW 0C to +70C -55C to +125C -65C to +150C +260C OPERATING ELECTRICAL CHARACTERISTICS TA = 25C VS = 2.5V unless otherwise specified Parameter Supply Voltage Input Offset Voltage Input Offset Current Input Bias Current Input Voltage Range Input Resistance Input Offset Voltage Drift Power Supply Rejection Ratio Common Mode Rejection Ratio Large Signal Voltage Gain Output Voltage Range Symbol VS V+ VOS IOS IB VIR RIN TCVOS PSRR 65 65 65 65 15 -0.3 -2.8 10 12 1.0 1.0 Min 2.0 4.0 4702A Typ Max 6.0 12.0 1.0 2.0 25 240 30 300 5.3 +2.8 -0.3 -2.8 10 12 1.0 1.0 Min 2.0 4.0 4702B Typ Max 6.0 12.0 2.0 3.5 25 240 30 300 5.3 +2.8 -0.3 -2.8 10 12 1.0 1.0 Min 2.0 4.0 4702 Typ Max 6.0 12.0 5.0 6.5 25 240 30 300 5.3 +2.8 Unit V V mV mV pA pA pA pA V V V/C dB RS 100K R S 100K 0C TA +70C RS 100K 0C TA +70C RL = 10K RL 1M R L = 1M Single supply 0C TA +70C R L = 10K Dual supply 0C TA +70C Test Conditions Dual Supply Single Supply RS 100K 0C TA +70C TA = 25C 0C TA +70C TA = 25C 0C TA +70C V+ = +5V VS = 2.5V 7 83 83 83 83 28 100 0.002 4.998 -2.44 2.44 8 0.01 65 65 65 65 15 7 83 83 83 83 28 100 0.01 60 60 60 60 12 7 83 83 83 83 28 100 0.01 CMRR dB AV V/mV V/mV V VO low VO high VO low VO high 4.99 0.002 4.99 4.998 0.002 4.99 4.998 -2.40 2.40 2.40 -2.44 -2.40 2.44 8 2.40 -2.44 -2.40 2.44 8 V Output Short Circuit Current Supply Current Power Dissipation Input Capacitance Bandwidth Slew Rate Rise time Overshoot Factor ISC mA IS PD CIN BW SR tr 0.7 1.1 4.0 6.0 4.0 6.0 4.0 6.0 mA VIN = 0V No Load VS = 2.5V All four amplifiers 20 30 20 30 20 30 mW 1 1 1 pF 1.5 1.9 0.2 10 0.7 1.1 1.5 1.9 0.2 10 0.7 1.1 1.5 1.9 0.2 10 MHz V/s s % AV = +1 RL = 10K RL = 10K RL = 10K CL = 100pF ALD4702A/ALD4702B ALD4702 Advanced Linear Devices 2 OPERATING ELECTRICAL CHARACTERISTICS (cont'd) T A = 25C VS = 2.5V unless otherwise specified Parameter Maximum Load Capacitance Symbol CL Min 4702A Typ 400 4000 Max Min 4702B Typ 400 4000 Max Min 4702 Typ 400 4000 Max Uni pF pF Test Conditions Gain = 1 Gain = 5 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 Settling Time ts 8.0 3.0 8.0 3.0 8.0 3.0 s s 0.01% 0.1% AV = -1 RL = 5K CL = 50pF TA = 25C VS = 5.0V unless otherwise specified Parameter Power Supply Rejection Ratio Common Mode Rejection Ratio Large Signal Voltage Gain Output Voltage Range Bandwidth Slew Rate Symbol PSRR Min 4702A Typ 83 Max Min 4702B Typ 83 Max Min 4702 Typ 83 Max Unit dB Test Conditions RS 100K CMRR 83 83 83 dB RS 100K AV VO low VO high BW SR 250 250 250 V/mV RL = 10K RL = 10K 4.8 -4.90 4.93 1.7 2.8 -4.8 4.8 -4.90 4.93 1.7 2.8 -4.8 4.8 -4.90 4.93 1.7 2.8 -4.8 V MHz V/s AV = +1 CL = 50pF VS = +5.0V -55C TA +125C unless otherwise specified Parameter Input Offset Voltage Input Offset Current Input Bias Current Power Supply Rejection Ratio Common Mode Rejection Ratio Large Signal Voltage Gain Output Voltage Range Symbol VOS IOS IB PSRR CMRR AV VO low VO high 60 60 10 75 83 25 0.1 4.9 0.2 4.8 Min 4702A DA Typ Max 2.0 8.0 10.0 60 60 10 75 83 25 0.1 4.9 0.2 4.8 Min 4702B DA Typ Max 4.0 8.0 10.0 60 60 7 75 83 25 0.1 4.9 0.2 Min 4702 DA Typ Max 7.0 8.0 10.0 Unit mV nA nA dB dB V/mV V RS 100K RS 100K AV = +1 RL 10K RL 10K Test Conditions RS 100K 4.8 ALD4702A/ALD4702B ALD4702 Advanced Linear Devices 3 Design & Operating Notes: 1. The ALD4702 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 ALD4702 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 ALD4702 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 ALD4702 is much more resistant to parasitic oscillations. 2. The ALD4702 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 ALD4702 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 ALD4702 an effective analog signal buffer for medium to high source impedance sensors, transducers, and other circuit networks. 5. The ALD4702 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 100K 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 7 6 COMMON MODE INPUT ) VOLTAGE RANGE (V OPEN LOOP VOLTAGE GAIN AS A FUNCTION OF SUPPLY VOLTAGE AND TEMPERATURE 1000 } -55C TA = 25C OPEN LOOP VOLTAGE GAIN (V/mV) 5 4 3 2 1 0 0 1 2 3 4 5 6 7 } +25C 100 } +125C 10 RL= 10K RL= 5K 1 0 2 4 SUPPLY VOLTAGE (V) 6 8 SUPPLY VOLTAGE (V) INPUT BIAS CURRENT AS A FUNCTION OF AMBIENT TEMPERATURE 10000 12 SUPPLY CURRENT AS A FUNCTION OF SUPPLY VOLTAGE SUPPLY CURRENT (mA) 10 8 TA = -55C 6 4 2 0 -25C +25C +80C +125C INPUTS GROUNDED OUTPUTS UNLOADED INPUT BIAS CURRENT (pA) 1000 100 VS = 2.5V 10 1.0 0.1 -50 -25 0 25 50 75 100 125 1 2 3 4 5 6 AMBIENT TEMPERATURE (C) SUPPLY VOLTAGE (V) ALD4702A/ALD4702B ALD4702 Advanced Linear Devices 4 TYPICAL PERFORMANCE CHARACTERISTICS OUTPUT VOLTAGE SWING AS A FUNCTION OF SUPPLY VOLTAGE 120 25C TA 125C RL = 10K RL = 10K OPEN LOOP VOLTAGE GAIN AS A FUNCTION OF FREQUENCY 100 80 60 40 20 0 -20 0 45 90 135 180 1 10 100 1K 10K 100K 1M 10M VS = 2.5V TA = 25C 7 OUTPUT VOLTAGE SWING (V) 5 4 3 2 0 1 2 RL = 2K 3 4 5 6 7 OPEN LOOP VOLTAGE GAIN (dB) 6 PHASE SHIFT IN DEGREES SUPPLY VOLTAGE (V) FREQUENCY (Hz) INPUT OFFSET VOLTAGE AS A FUNCTION OF AMBIENT TEMPERATURE REPRESENTATIVE UNITS INPUT OFFSET VOLTAGE (mV) VS = 2.5V INPUT OFFSET VOLTAGE AS A FUNCTION OF COMMON MODE INPUT VOLTAGE 15 INPUT OFFSET VOLTAGE (mV) +5 +4 +3 +2 +1 0 -1 -2 -3 -4 -5 -50 -25 0 +25 +50 10 5 0 -5 -10 -15 VS = 2.5V TA = 25C +75 +100 +125 -2 -1 0 +1 +2 +3 AMBIENT TEMPERATURE (C) COMMON MODE INPUT VOLTAGE (V) OPEN LOOP VOLTAGE GAIN AS A FUNCTION OF LOAD RESISTANCE OPEN LOOP VOLTAGE GAIN (V/mV) 1000 VOLTAGE NOISE DENSITY AS A FUNCTION OF FREQUENCY 150 VOLTAGE NOISE DENSITY (nV/ Hz) VS = 2.5V TA = 25C 100 125 100 75 50 25 0 VS = 2.5V TA = 25C 10 1 1K 10K 100K 1000K 10 100 1K 10K 100K 1000K LOAD RESISTANCE () FREQUENCY (Hz) LARGE - SIGNAL TRANSIENT RESPONSE 5V/div VS = 2.5V TA = 25C RL = 10K CL = 50pF SMALL - SIGNAL TRANSIENT RESPONSE 100 mV/div VS = 2.5V TA = 25C RL = 10K CL = 50pF 1V/div 2s/div 20 mV/div 2s/div ALD4702A/ALD4702B ALD4702 Advanced Linear Devices 5 TYPICAL APPLICATIONS RAIL-TO-RAIL VOLTAGE FOLLOWER/BUFFER RAIL-TO-RAIL WAVEFORM = ZIN ~ 1012 VIN 0 VIN 5V + 5V 0.1F OUTPUT RL =10K INPUT +5V 0V CL 400pF +5V OUTPUT 0V * See rail to rail waveform Performance waveforms. Upper trace is the output of a Wien Bridge Oscillator. Lower trace is the output of Rail-to-Rail voltage follower. LOW OFFSET SUMMING AMPLIFIER PHOTO DETECTOR CURRENT TO VOLTAGE CONVERTER 50K 10K INPUT 1 INPUT 2 10K GAIN = 5 * Circuit Drives Large Load Capacitance 4000pF + - 2.5V .01F CL = 4000pF OUTPUT +2.5V .01F RF = 5M I PHOTODIODE +2.5V VOUT = I x RF + -2.5V RL = 10K WIEN BRIDGE OSCILLATOR (RAIL-TO -RAIL) SINE WAVE GENERATOR RAIL-TO-RAIL VOLTAGE COMPARATOR +5V + .01F C = .01F R = 10K ~ f= +2.5V OUTPUT -2.5V 10K 10K 1 2RC ~ 1.6KHz 10K VIN +5V 50K + 10M 0.1F OUTPUT * See rail to rail waveform ALD4702A/ALD4702B ALD4702 Advanced Linear Devices 6 |
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