ADVANCED LINEAR DEVICES, INC. ALD2704A/ALD2704B ALD2704 DUAL RAIL-TO-RAIL CMOS OPERATIONAL AMPLIFIER GENERAL DESCRIPTION FEATURES The ALD2704A/ALD2704B/ALD2704 is a dual monolithic operational amplifier with MOSFET input that has rail-to-rail input and output voltage ranges. The input voltage range and output voltage range are very close to the positive and negative power supply voltages. Typically the input voltage can be beyond positive power supply voltage V+ or the negative power supply voltage V- by up to 300mV. The output voltage swings to within 60mV of either positive or negative power supply voltages at rated load. • • • • • • With high impedance load, the output voltage of the ALD2704A/ALD2704B/ ALD2704 approaches within 1mV of the power supply rails. This device is designed as an alternative to the popular J-FET input operational amplifier in applications where lower operating voltages, such as 9V battery or ±3.25V to ±5V power supplies are being used. The ALD2704A/ ALD2704B/ALD2704 offers high slew rate of 5V/µs. It is designed and manufactured with Advanced Linear Devices' standard enhanced ACMOS silicon gate CMOS process, and it offers low unit cost and exceptional reliability. • • • • • The rail-to-rail input and output feature of the ALD2704A/ALD2704B/ ALD2704 expands signal voltage range for a given operating supply voltage and allows numerous analog serial stages to be implemented without losing operating voltage margin. The output stage is designed to drive up to 10mA into 400pF capacitive and 1.5KΩ resistive loads at unity gain and up to 4000pF at a gain of 5. Short circuit protection to either ground or the power supply rails is at approximately 15mA clamp current. Due to complementary output stage design, the output can source and sink 10mA into a load with symmetrical drive and is ideally suited for applications where push-pull voltage drive is desired. For each of the operational amplifier, the offset voltage is trimmed on-chip to eliminate the need for external nulling in many applications. For precision applications, the output is designed to settle to 0.1% in 2µs. In large signal buffer applications, the operational amplifier can function as an ultrahigh input impedance voltage follower /buffer that allows input and output voltage swings from positive to negative supply voltages. This feature is intended to greatly simplify systems design and eliminate higher voltage power supplies in many applications. Additionally, robust design and rigorous screening make this device especially suitable for operation in temperature-extreme environments and rugged conditions. ORDERING INFORMATION (“L” suffix denotes lead-free (RoHS)) 0°C to +70°C Operating Temperature Range 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 ALD2704ASAL ALD2704BSAL ALD2704SAL ALD2704APAL ALD2704BPAL ALD2704PAL ALD2704ADA ALD2704BDA ALD2704DA • Rail-to-rail input and output voltage ranges Symmetrical push-pull output drives Output settles to 2mV of supply rails 5.0V/µs slew rate High capacitive load capability -- up to 4000pF No frequency compensation required -- unity gain stable Extremely low input bias currents -- <1.0pA typical (20pA max.) Ideal for high source impedance applications High voltage gain -- typically 100V/mV Output short circuit protected Unity gain bandwidth of 2.1MHz Suitable for rugged, temperature-extreme environments APPLICATIONS • • • • • • • • • • • • • • • Voltage amplifier Voltage follower/buffer Charge integrator Photodiode amplifier Data acquisition systems High performance portable instruments Signal conditioning circuits Low leakage amplifiers Active filters Sample/Hold amplifier Picoammeter Current to voltage converter Coaxial cable driver Capacitive sensor amplifier Piezoelectric transducer amplifier PIN CONFIGURATION OUT A 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. Rev 2.0 ©2010 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, CA 94089-1706 Tel: (408) 747-1155 Fax: (408) 747-1286 www.aldinc.com ABSOLUTE MAXIMUM RATINGS Supply voltage, V+ referenced to VSupply voltage, VS referenced to VDifferential input voltage range Power dissipation Operating tempurature range SAL, PAL packages DA package Storage tempurature range Lead tempurature, 10 seconds CAUTION: ESD Sensitive Device. Use static control procedures in ESD controlled environment. -0.3V to V++10.6V ±5.3V -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 = ±5.0V unless otherwise specified Min 2704A Typ Symbol Supply Voltage VS V+ Input Offset Voltage VOS Input Offset Current IOS 1.0 15 240 1.0 15 240 Input Bias Current IB 1.0 20 300 1.0 20 300 Input Voltage Range VIR Input Resistance RIN Input Offset Voltage Drift TCVOS Power Supply Rejection Ratio PSRR 65 80 65 80 60 Common Mode Rejection Ratio CMRR 65 83 65 83 Large Signal Voltage Gain AV 15 28 100 15 28 100 Output Voltage Range VO low VO high VO low VO high ±3.25 6.5 Max Min 2704B Typ Max Parameter ±5.0 ±3.25 10.0 6.5 4.90 4.99 5.3 2704 Typ Unit Test Conditions V V Dual Supply Single Supply 5.0 6.0 mV mV RS ≤ 100KΩ 0°C ≤ TA ≤ +70°C 1.0 15 240 pA pA TA = 25°C 0°C ≤ TA ≤ +70°C 1.0 20 300 pA pA TA = 25°C 0°C ≤ TA ≤ +70°C 5.3 V ±5.0 ±3.25 10.0 6.5 1.0 1.5 -5.3 Min ±5.0 10.0 2.0 3.0 -5.3 5.3 Max -5.3 1012 1012 1012 5 5 5 Ω µV/°C RS ≤ 100KΩ 80 dB RS ≤ 100KΩ 0°C ≤ TA ≤ +70°C 60 83 dB RS ≤ 100KΩ 0°C ≤ TA ≤ +70°C 10 28 100 V/mV V/mV RL = 100KΩ RL ≥ 1MΩ -4.96 -4.90 -4.96 -4.90 -4.96 -4.90 4.95 4.90 4.95 4.90 4.95 -4.998 -4.99 -4.998 -4.99 -4.998 -4.99 4.998 4.99 4.998 4.99 4.998 ISC 15 Supply Current IS 5.0 Power Dissipation PD Input Capacitance CIN 1 1 1 Bandwidth BW 2.1 2.1 2.1 MHz Slew Rate SR 5.0 5.0 5.0 V/µs AV = +1 RL = 2.0KΩ Rise time tr 0.1 0.1 0.1 µs RL = 2.0KΩ 15 15 15 % RL = 2.0KΩ CL = 100pF ALD2704A/ALD2704B ALD2704 6.5 5.0 65 15 V RL ≥ 10KΩ 0°C ≤ TA ≤ +70°C RL = 1MΩ 0°C ≤ TA ≤ +70°C Output Short Circuit Current Overshoot Factor 15 V 6.5 5.0 65 Advanced Linear Devices mA 6.5 65 mA mW VIN = -5V No Load Both amplifiers, No Load VS = ±5.0V pF 2 of 9 OPERATING ELECTRICAL CHARACTERISTICS (cont'd) TA = 25°C VS = ±5.0V unless otherwise specified 2704A Min Typ 2704B Max Min Typ 2704 Parameter Symbol Max Min Typ Maximum Load Capacitance CL 400 4000 400 4000 400 4000 Input Noise Voltage en 26 26 Input Current Noise in 0.6 Settling Time ts 5.0 2.0 Max Unit Test Conditions pF pF Gain = 1 Gain = 5 26 nV/√Hz f =1KHz 0.6 0.6 fA/√Hz f =10Hz 5.0 2.0 5.0 2.0 µs µs 0.01% 0.1% AV = 1 RL = 5KΩ CL= 50pF VS = ±5.0V -55°C ≤ TA ≤ +125°C unless otherwise specified Min 2704ADA Typ Max 2704DA Typ Max Unit Test Conditions 4.0 7.0 mV RS ≤ 100KΩ 8.0 8.0 8.0 nA 10.0 10.0 10.0 nA Min 2704BDA Typ Max Parameter Symbol Min Input Offset Voltage VOS 2.0 Input Offset Current IOS Input Bias Current IB Power Supply PSRR 60 75 60 75 60 75 dB RS ≤ 100KΩ Common Mode Rejection Ratio CMRR 60 83 60 83 60 83 dB RS ≤ 100KΩ Large Signal AV 10 25 10 25 10 25 V/mV RL = 10KΩ VO low VO high 4.8 -4.9 4.9 4.8 -4.9 4.9 4.8 -4.9 4.9 V RL = 10KΩ Rejection Ratio Voltage Gain Output Voltage Range ALD2704A/ALD2704B ALD2704 -4.8 -4.8 Advanced Linear Devices -4.8 3 of 9 Design & Operating Notes: 1. The ALD2704A/ALD2704B/ALD2704 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 ALD2704A/ALD2704B/ ALD2704 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 ALD2704A/ALD2704B/ALD2704 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 ALD2704A/ALD2704B/ ALD2704 is much more resistant to parasitic oscillations. 2. The ALD2704A/ALD2704B/ALD2704 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 ALD2704A/ALD2704B/ALD2704 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 (10V 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. The voltage follower configuration, the oscillation and resistant with the railto-rail input and output feature, makes the ALD2704A/ALD2704B/ ALD2704 an effective analog signal buffer for medium to high source impedance sensors, transducers, and other circuit networks. 5. The ALD2704A/ALD2704B/ALD2704 operational amplifier has been designed to provide 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 100KΩ 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 OPEN LOOP VOLTAGE GAIN AS A FUNCTION OF SUPPLY VOLTAGE AND TEMPERATURE COMMON MODE INPUT VOLTAGE RANGE AS A FUNCTION OF SUPPLY VOLTAGE 1000 ±7 OPEN LOOP VOLTAGE GAIN (V/mV) COMMON MODE INPUT VOLTAGE RANGE (V) TA = 25°C ±6 ±5 ±4 } -55°C } +25°C 100 } +125°C 10 ±3 RL= 10KΩ RL= 5KΩ 1 ±2 ±3 ±2 ±5 ±4 ±6 0 ±7 ±2 INPUT BIAS CURRENT AS A FUNCTION OF AMBIENT TEMPERATURE ±8 ±6 SUPPLY CURRENT AS A FUNCTION OF SUPPLY VOLTAGE 10000 8 SUPPLY CURRENT (mA) INPUT BIAS CURRENT (pA) ±4 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) VS = ±5.0V 1000 100 10 1.0 INPUTS GROUNDED OUTPUT UNLOADED 7 6 5 TA = -55°C 4 -25°C +25°C +80°C +125°C 3 2 1 0 0.1 -50 -25 0 25 50 75 100 125 AMBIENT TEMPERATURE (°C) ALD2704A/ALD2704B ALD2704 0 ±1 ±2 ±3 ±4 ±5 ±6 ±7 SUPPLY VOLTAGE (V) Advanced Linear Devices 4 of 9 TYPICAL PERFORMANCE CHARACTERISTICS (cont'd) OUTPUT VOLTAGE SWING AS A FUNCTION OF SUPPLY VOLTAGE OPEN LOOP VOLTAGE AS A FUNCTION OF FREQUENCY 120 -55°C ≤ TA ≤ 125°C 100 OPEN LOOP VOLTAGE GAIN (dB) ±6 RL = 10KΩ RL = 10KΩ ±5 ±4 RL = 2KΩ ±3 VS = ±5.0V TA = 25°C 80 60 0 40 45 20 90 0 135 ±2 0 ±1 ±2 ±3 ±4 ±5 ±6 180 -20 ±7 1 SUPPLY VOLTAGE (V) 10 100 1K 10K 100K 1M PHASE SHIFT IN DEGREES OUTPUT VOLTAGE SWING (V) ±7 10M FREQUENCY (Hz) +5 +4 INPUT OFFSET VOLTAGE AS A FUNCTION OF COMMON MODE INPUT VOLTAGE 15 INPUT OFFSET VOLTAGE (mV) INPUT OFFSET VOLTAGE (mV) INPUT OFFSET VOLTAGE AS A FUNCTION OF AMBIENT TEMPERATURE REPRESENTATIVE UNITS VS = ±5.0V +3 +2 +1 0 -1 -2 -3 -4 VS = ±5.0V TA = 25ºC 10 5 0 -5 -10 -15 -5 -50 -25 0 +25 +50 +75 -4 +100 +125 AMBIENT TEMPERATURE (°C) 0 +2 +4 +6 VOLTAGE NOISE DENSITY AS A FUNCTION OF FREQUENCY OPEN LOOP VOLTAGE GAIN AS A FUNCTION OF LOAD RESISTANCE 150 VOLTAGE NOISE DENSITY (nV/ √ Hz) 1000 OPEN LOOP VOLTAGE GAIN (V/mV) -2 COMMON MODE INPUT VOLTAGE (V) 100 VS = ±5.0V TA = 25°C 10 125 VS = ±5.0V TA = 25°C 100 75 50 25 0 1 1K 10K 100K 1000K 10 100 LOAD RESISTANCE (Ω) LARGE - SIGNAL TRANSIENT RESPONSE 10K 100K 1000K SMALL - SIGNAL TRANSIENT RESPONSE 5V/div VS = ±5.0V TA = 25°C RL = 1KΩ CL = 50pF 5V/div 2µs/div ALD2704A/ALD2704B ALD2704 1K FREQUENCY (Hz) Advanced Linear Devices 100mV/div 50mV/div VS = ± 5.0V TA = 25°C RL = 1.0KΩ CL = 50pF 1µs/div 5 of 9 TYPICAL APPLICATIONS RAIL-TO-RAIL VOLTAGE FOLLOWER/BUFFER RAIL-TO-RAIL VOLTAGE COMPARATOR +12V +10V = 1012Ω ZIN ~ 0.1µF VIN VIN CL + 400pF VOUT RL ≥ 1.5KΩ 0 ≤ VIN ≤ 10V 0.1µF - +12V VOUT + 50K 10M LOW OFFSET SUMMING AMPLIFIER PHOTO DETECTOR CURRENT TO VOLTAGE CONVERTER RF = 5M 10K 50K +5V INPUT 1 0.1µF I - INPUT 2 10K VOUT GAIN = 5 + * Circuit Drives Large Load Capacitance ≤ 4000pF +5V - CL = 4000pF RL ≥ 1.5K + -5V -5V 0.1µF BANDPASS NETWORK WIEN BRIDGE OSCILLATOR (RAIL-TO -RAIL) SINE WAVE GENERATOR C2 R2 +5V - C1 VOUT + 10K -5V R1 VIN - +5V VOUT + .01µF R = 10K C = .01µF Low Frequency Breakpoint ƒL = 10K High Frequency Cutoff ƒH = RF R1 C1 1 = 160Hz 2π R1C1 1 = 32KHz 2π R2 C 2 100K 1000pF 5K R1 R1 = 10K C1 = 100nF R2 = 10K C2 = 500pF PRECISION CHARGE INTEGRATOR LOW PASS FILTER (RFI FILTER) VIN -5V 10K 1 ~ ~ 1.6K Hz f= = 2πRC 5K VOUT = I X RF PHOTODIODE +9V - 0.02µF VOUT +5V 1MΩ VIN - + VOUT + -5V Cutoff frequency = 1 = 3.2kHz π R1C1 Gain = 10 Frequency roll-off 20dB/decade ALD2704A/ALD2704B ALD2704 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 ALD2704A/ALD2704B ALD2704 C ø Advanced Linear Devices 7 of 9 PDIP-8 PACKAGE DRAWING 8 Pin Plastic DIP Package Millimeters E E1 D S A2 A1 e b A L 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 7.37 7.87 0.290 0.310 L 2.79 3.81 0.110 0.150 S-8 1.02 2.03 0.040 0.080 0° 15° 0° 15° ø b1 Inches c e1 ALD2704A/ALD2704B ALD2704 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 Inches Dim A Min Max 3.55 5.08 Min 0.140 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 ALD2704A/ALD2704B ALD2704 ø Advanced Linear Devices 9 of 9