e ADVANCED LINEAR DEVICES, INC. TM EPAD EN ® AB LE D ALD2736A/ALD2736 PRECISION DUAL ULTRA MICROPOWER CMOS OPERATIONAL AMPLIFIER GENERAL DESCRIPTION FEATURES & BENEFITS The ALD2736A/ALD2736 is a precision dual low-cost high-slew-rate high-performance ultra micropower monolithic CMOS operational amplifier intended for a broad range of analog applications using ±1V to ±5V dual power supply systems, as well as +2V to +10V battery operated systems. All device characteristics are specified for +5V single supply or ±2.5V dual supply systems. Typical supply current is 25µA per op amp at 5V supply voltage. It is manufactured with Advanced Linear Devices' enhanced EPAD® silicon gate CMOS process. • Typical 25µA supply current per amplifier • 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 -- 0.01pA typical • Ideal for high source impedance applications • Dual power supplies ±1.0V to ±5.0V • Single power supply +2.0V to +10.0V • 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 • Ultra Micropower symmetrical complementary output drive • Suitable for rugged, temperature-extreme environments The ALD2736A/ALD2736 is designed to offer high performance for a wide range of applications requiring very low power dissipation. It has been developed specifically for the +5V single battery or ±1V to ±5V dual battery user and offers the popular industry standard single operational amplifier pin configuration. 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. Second, the device was designed to accommodate mixed applications where digital and analog circuits may operate off the same power supply or battery. Third, 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 ALD2736A/ALD2736 a versatile, micropower operational amplifier. The ALD2736A/ALD2736, designed and fabricated with silicon gate CMOS technology, offers on-chip offset voltage trimming, allowing the device to be used without nulling in most applications. It is also designed to offer tolerance to over-voltage input spikes of 300mV beyond supply rails, high open loop voltage gain, and robust operation at temperature extremes. Additionally, robust design and rigorous screening make this device especially suitable for operation in temperature-extreme environments and rugged conditions. APPLICATIONS • • • • • • • • • • • • • • Voltage amplifier Voltage follower/buffer Charge integrator Photodiode amplifier Data acquisition systems High performance portable instruments Biochemical probe interface Signal conditioning circuits Sensor and transducer amplifiers Low leakage amplifiers Precision Sample and Hold amplifiers Active filters Picoammeter Current to voltage converter PIN CONFIGURATION ORDERING INFORMATION (“L” suffix denotes lead-free (RoHS)) Operating Temperature Range 0°C to +70°C 0°C to +70°C -55°C to +125°C 8-Pin Small Outline Package (SOIC) 8-Pin Plastic Dip Package 8-Pin CERDIP Package ALD2736ASAL ALD2736SAL ALD2736APAL ALD2736PAL ALD2736ADA ALD2736DA 1 8 V+ -IN A 2 7 OUT B +IN A 3 6 -IN B V- 4 5 +IN B TOP VIEW SAL, PAL, DA PACKAGES * Contact factory for leaded (non-RoHS) or high temperature versions. ©2014 Advanced Linear Devices, Inc., Vers. 2.0 OUT A www.aldinc.com 1 of 9 ABSOLUTE MAXIMUM RATINGS Supply voltage, V+ Differential input voltage range Power dissipation Operating temperature range SAL, PAL packages DA package Storage temperature range Lead temperature, 10 seconds CAUTION: ESD Sensitive Device. Use static control procedures in ESD controlled environment. 10.6V -0.3V to V+ +0.3V 600mW 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 ALD2736A Typ Max Supply Voltage VS V+ Input Offset Voltage VOS Input Offset Current IOS 0.01 10 240 Input Bias Current IB 0.01 10 300 Input Voltage Range VIR Input Resistance RIN Input Offset Voltage Drift TCVOS Power Supply Rejection Ratio ±1.0 2.0 ±5.0 10.0 Min ALD2736 Typ +5.3 +2.8 Unit Dual Supply Single Supply 2.0 2.5 mV mV RS ≤ 100KΩ 0°C ≤ TA ≤ +70°C 0.01 10 240 pA pA TA = 25°C 0°C ≤ TA ≤ +70°C 0.01 10 300 pA pA TA = 25°C 0°C ≤ TA ≤ +70°C +5.3 +2.8 V V V+ = +5V VS = ±2.5V ±5.0 10.0 -0.3 -2.8 1014 1014 5 5 PSRR 82 82 Common Mode Rejection Ratio CMRR Large Signal Voltage Gain AV Output Voltage Range VO low VO high 4.99 VO low VO high 2.40 Ω µV/°C RS ≤ 100KΩ 82 82 dB dB RS ≤ 100KΩ 0°C ≤ TA ≤ +70°C 83 83 83 83 dB dB RS ≤ 100KΩ 0°C ≤ TA ≤ +70°C 100 100 V/mV RL = 1MΩ V V RL = 1MΩ 0°C ≤ TA ≤ +70°C V RL =100KΩ 0°C ≤ TA ≤ +70°C 0.001 4.999 0.01 -2.48 -2.40 4.99 2.48 2.40 0.001 4.999 0.01 -2.48 -2.40 2.40 V 200 µA Output Short Circuit Current ISC Supply Current IS Power Dissipation PD Input Capacitance CIN 1 1 Bandwidth BW 400 400 KHz Slew Rate SR .17 .17 V/µs ALD2736A/ALD2736 Test Conditions V V ±1.0 2.0 1.0 1.5 -0.3 -2.8 Max 200 50 85 50 425 Advanced Linear Devices 100 µA VIN = 0V, No Load 500 µW VS = ±2.5V pF AV = +1, RL = 1MΩ 2 of 9 OPERATING ELECTRICAL CHARACTERISTICS (cont'd) TA = 25°C VS = ±2.5V unless otherwise specified (cont'd) ALD2736A Parameter Symbol Rise time tr Min Overshoot Factor Typ ALD2736 Max Min Typ Max Unit Test Conditions 1.0 1.0 µs RL = 1MΩ 20 20 % RL = 1MΩ, CL = 25pF Settling Time ts 10.0 10.0 µs 0.1%, AV = -1, RL= 1MΩ, CL = 25pF TA = 25°C VS = ±1.0V unless otherwise specified ALD2736A Parameter Symbol Min Power Supply Rejection Ratio PSRR 70 Common Mode Rejection Ratio CMRR Large Signal Voltage Gain AV Output Voltage Range VO low VO high 0.9 Typ ALD2736 Max Unit Test Conditions 70 dB RS ≤ 1MΩ 70 70 dB RS ≤ 1MΩ 50 50 V/mV RL = 1MΩ V RL = 1MΩ -0.95 0.95 Min -0.9 0.9 Typ -0.95 0.95 Max -0.9 Bandwidth BW 0.3 0.3 MHz Slew Rate SR 0.17 0.17 V/µs AV = +1, CL = 50pF Max Unit Test Conditions RS ≤ 100KΩ VS = ±2.5V -55°C ≤ TA ≤ +125°C unless otherwise specified ALD2736A Symbol Input Offset Voltage VOS 2.0 3.0 mV Input Offset Current IOS 2.0 2.0 nA Input Bias Current IB 2.0 2.0 nA Power Supply Rejection Ratio PSRR 75 75 dB RS ≤ 1MΩ Common Mode Rejection Ratio CMRR 83 83 dB RS ≤ 1MΩ Large Signal Voltage Gain AV 50 50 V/mV RL = 1MΩ Output Voltage Range VO low VO high V V RL = 1MΩ ALD2736A/ALD2736 Min 2.30 Typ ALD2736 Parameter -2.40 2.40 Max Min -2.30 2.30 Advanced Linear Devices Typ -2.40 2.40 -2.30 3 of 9 Design & Operating Notes: 1. The ALD2736A/ALD2736 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 ALD2736A/ALD2736 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 ALD2736A/ALD2736 has complementary p-channel and nchannel input differential stages connected in parallel to accomplish rail to rail common mode input voltage ranges. 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 ALD2736A/ ALD2736 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 provisions in the 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 0.01pA 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 10 14Ω 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 ALD2736A/ALD2736 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 ALD2736A/ALD2736, 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 0.1°C above ambient temperature under most operating conditions. 7. The ALD2736A/ALD2736 has an internal design architecture that provides robust high temperature operation. Contact factory for custom screening versions. TYPICAL PERFORMANCE CHARACTERISTICS SUPPLY CURRENT AS A FUNCTION OF SUPPLY VOLTAGE ±6 INPUTS GROUNDED OUTPUT UNLOADED COMMON MODE INPUT VOLTAGE RANGE (V) SUPPLY CURRENT (µA) 100 COMMON MODE INPUT VOLTAGE RANGE AS A FUNCTION OF SUPPLY VOLTAGE +25°C 80 -25°C TA = -55°C 60 40 20 +70°C TA = 25°C ±4 ±3 ±2 ±1 +125°C 0 0 0 ±1 ±2 ±3 ±4 ±5 0 ±6 ±1 ±2 ±3 ±4 ±5 ±6 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) OPEN LOOP VOLTAGE GAIN AS A FUNCTION OF LOAD RESISTANCE INPUT BIAS CURRENT AS A FUNCTION OF AMBIENT TEMPERATURE 1000 INPUT BIAS CURRENT (pA) 1000 OPEN LOOP VOLTAGE GAIN (V/mV) ±5 100 10 VS = ±2.5V TA = 25°C 100 VS = ±2.5V 10 1.0 0.1 0.01 1 10K 100K 1M 10M ALD2736A/ALD2736 -50 -25 0 +25 +50 +75 +100 +125 AMBIENT TEMPERATURE (°C) LOAD RESISTANCE (Ω) Advanced Linear Devices 4 of 9 TYPICAL PERFORMANCE CHARACTERISTICS (cont'd) OPEN LOOP VOLTAGE GAIN AS A FUNCTION OF SUPPLY VOLTAGE AND TEMPERATURE OUTPUT VOLTAGE SWING AS A FUNCTION OF SUPPLY VOLTAGE ±6 OUTPUT VOLTAGE SWING (V) OPEN LOOP VOLTAGE GAIN (V/mV) 1000 100 10 -55°C ≤ TA ≤ +125°C RL = 100KΩ 1 -55°C ≤ TA ≤ +125°C RL = 100KΩ ±5 ±4 ±3 ±2 ±1 0 ±1 ±2 ±3 ±4 ±5 ±6 0 ±1 ±2 ±3 ±4 ±5 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) OPEN LOOP VOLTAGE GAIN AS A FUNCTION OF FREQUENCY LARGE-SIGNAL TRANSIENT RESPONSE ±6 120 VS = ±2.5V TA = 25°C 80 60 0 40 45 20 90 0 135 -20 180 1 10 100 1K 10K 100K 1M PHASE SHIFT IN DEGREES OPEN LOOP VOLTAGE GAIN (dB) 5V/div 100 VS = ±2.5V TA = 25°C RL = 100KΩ CL = 25pF 2V/div 10µs/div 10M FREQUENCY (Hz) LARGE-SIGNAL TRANSIENT RESPONSE 2V/div 500mV/div ALD2736A/ALD2736 SMALL-SIGNAL TRANSIENT RESPONSE VS = ±1.0V TA = 25°C RL = 100KΩ CL = 25pF 100mV/div VS = ±2.5V TA = 25°C RL = 100KΩ CL = 25pF 10µs/div 50mV/div 10µs/div Advanced Linear Devices 5 of 9 TYPICAL APPLICATIONS RAIL-TO-RAIL VOLTAGE FOLLOWER/BUFFER PHOTO DETECTOR CURRENT TO VOLTAGE CONVERTER 5V ~ 1012Ω ZIN = RF = 5M 0.1µF I OUTPUT 1/2 ALD2736 0≤ VIN ≤ 5V 1/2 ALD2736 RAIL-TO-RAIL WAVEFORM V+ = +2.5V V2 -2.5V * See Rail to Rail Waveform INPUT 10M + 10M 10M 10M 0.1µF 1/2 ALD2736 0.1µF V3 +5V 0V +5V OUTPUT 0V VOUT - VOUT = 1 X RF RL = 100K + HIGH INPUT IMPEDANCE RAIL-TO-RAIL PRECISION DC SUMMING AMPLIFIER V1 +2.5V - PHOTODIODE + VIN V- ≤ VIN ≤ V+ V4 Performance waveforms. Upper trace is the output of a Wien Bridge Oscillator. Lower trace is the output of Rail-to-rail voltage follower. V- ≤ VOUT ≤ V+ V- = - 2.5V 10M 10M VOUT = V1 + V2 - V3 - V4 RIN = 10MΩ Accuracy limited by resistor tolerances and input offset voltage WIEN BRIDGE OSCILLATOR (RAIL-TO-RAIL) SINE WAVE GENERATOR RAIL-TO-RAIL WINDOW COMPARATOR +5V - 8 +2.5V 100K VREF (HIGH) 3 1 VOUT 1/2 ALD2736 + 2 10K -2.5V .01µF 5 10K + 7 100K ~ f= - 10K R = 10K 1/4 74 C00 VOUT VIN C = .01µF 1/2 ALD2736 + VREF (LOW) 6 - 4 ~ 1.6KHZ 1 = 2πRC 1/2 ALD2736 VOUT (LOW) FOR VREF (LOW) < VIN < VREF(HIGH) * See Rail to Rail Waveform LOW VOLTAGE INSTRUMENTATION AMPLIFIER V+ 0.1µF 1M + 100K - 500K 100K V- 1/2 ALD2736 f max = 20KHz -40mV ≤ VIN ≤ 40mV V+ V+ 0.1µF 0.1µF + 50K V+ 1M 0.1µF 100K 1M 100K VOUT V- 0.1µF ALD1736 V- 1M + V- 0.1µF 1/2 ALD2736 ALD2736A/ALD2736 GAIN = 25 V- ≤ VOUT ≤ V+ All resistors are 1% V+ = +1.0V V- = -1.0V Short Circuit Input Current 1µA Advanced Linear Devices 6 of 9 SOIC-8 PACKAGE DRAWING 8 Pin Plastic SOIC Package E Millimeters Dim S (45°) D A Min 1.35 Max 1.75 Min 0.053 Max 0.069 A1 0.10 0.25 0.004 0.010 b 0.35 0.45 0.014 0.018 C 0.18 0.25 0.007 0.010 D-8 4.69 5.00 0.185 0.196 E 3.50 4.05 0.140 0.160 1.27 BSC e A A1 e Inches 0.050 BSC H 5.70 6.30 0.224 0.248 L 0.60 0.937 0.024 0.037 ø 0° 8° 0° 8° S 0.25 0.50 0.010 0.020 b S (45°) H L ALD2736A/ALD2736 C ø Advanced Linear Devices 7 of 9 PDIP-8 PACKAGE DRAWING 8 Pin Plastic DIP Package E E1 Millimeters D S A2 A1 e b b1 A L Inches Dim Min Max Min Max A 3.81 5.08 0.105 0.200 A1 0.38 1.27 0.015 0.050 A2 1.27 2.03 0.050 0.080 b 0.89 1.65 0.035 0.065 b1 0.38 0.51 0.015 0.020 c 0.20 0.30 0.008 0.012 D-8 9.40 11.68 0.370 0.460 E 5.59 7.11 0.220 0.280 E1 7.62 8.26 0.300 0.325 e 2.29 2.79 0.090 0.110 e1 L 7.37 7.87 0.290 0.310 2.79 3.81 0.110 0.150 S-8 1.02 2.03 0.040 0.080 0° 15° 0° 15° ø c e1 ALD2736A/ALD2736 ø Advanced Linear Devices 8 of 9 CERDIP-8 PACKAGE DRAWING 8 Pin CERDIP Package E E1 Millimeters D A1 s A L L2 b b1 e L1 Min Inches Dim A 3.55 Max 5.08 0.140 Min Max 0.200 A1 1.27 2.16 0.050 0.085 b 0.97 1.65 0.038 0.065 b1 0.36 0.58 0.014 0.023 C 0.20 0.38 0.008 0.015 D-8 -- 10.29 -- 0.405 E 5.59 7.87 0.220 0.310 E1 7.73 8.26 0.290 0.325 e 2.54 BSC 0.100 BSC e1 7.62 BSC 0.300 BSC L 3.81 5.08 0.150 0.200 L1 3.18 -- 0.125 -- L2 0.38 1.78 0.015 0.070 S -- 2.49 -- 0.098 Ø 0° 15° 0° 15° C e1 ALD2736A/ALD2736 ø Advanced Linear Devices 9 of 9