ALD1722GSAL

ADVANCED LINEAR DEVICES, INC. TM e ® EPAD D LE AB EN ALD1722/ALD1722G PRECISION LOW POWER CMOS OPERATIONAL AMPLIFIER GENERAL DESCRIPTION FEATURES & BENEFITS The ALD1722/ALD1722G is a monolithic precision low power CMOS operational amplifier intended for a broad range of precision applications requiring exremely low input signal power. Input signal power is the product of input offset voltage and input bias current, which represents the minimum required power draw from the signal source in order to drive the input of the operational amplifier. Input signal power is also a figure of merit in source loading and its associated error, and is a measure of the basic signal resolution possible through the operational amplifier for a given signal source. For certain types of signal sources, signal loading directly translates into a significant distortion or "interface noise equivalent " term. • • • • • • The ALD1722/ALD1722G is designed to set a new standard in low input signal power requirements. The typical input loading at its input is 0.03 mV offset voltage and 0.01 pA input bias current at 25C, resulting in 0.0003 fW input signal power draw. This input characteristic virtually eliminates any loading effects on most types of signal sources, offering unparalled accuracy and signal integrity and fidelity. Obviously, for capacitive and high sensitivity, high impedance signal sources, the ALD1722/ALD1722G is ideally suited. It is readily suited for +5V single supply (or ±2V to ±5V) systems, with low operating power dissipation, a traditional strength of CMOS technology. It is offered with industry standard pin configuration of µA741 and ICL7611 types. The ALD1722/ALD1722G can operate with rail to rail large signal input and output voltages with relatively high slew rate. The input voltage can be equal to or exceed the positive and negative supply voltages while the output voltage can swing close to these supply voltage rails. This feature significantly reduces the supply overhead voltage required to operate the operational amplifier and allows numerous analog serial stages to operate in a low power supply environment. circuits may operate off the same power supply or battery. This device also features rail-to-rail input and output voltage ranges, tolerance to over-voltage input spikes of 300mV beyond supply rails, high open loop voltage gain, useful bandwidth of 1.5 MHz, slew rate of 2.1 V/µs, and low supply current of 0.8mA. Finally, the output stage can typically drive up to 400pF capacitive loads in the unity gain mode and up to 4000 pF capacitive load at a gain of 5. These features make the ALD1722/ALD1722G a versatile, high precision operational amplifier that is user friendly and easy to use with virtually no source loading and zero input-loading induced source errors. Additionally, robust design and rigorous screening make this device especially suitable for operation in temperature-extreme environments and rugged conditions. • • • • • • • • Lead Free - RoHS compatible Robust high-temperature operation Industry standard pinout Rail-to-rail input/output Exremely low input signal power Input bias current of 0.01pA and input offset voltage of 25µV No external components No internal chopper clocking noise No chopper dynamic power dissipation Simple and cost effective Small package size Drive up to 4000pF load capacitance Low power Suitable for rugged, temperature-extreme environments APPLICATIONS • • • • • • • • • • • • • • • • Precision cable driver Sensor interface circuits Unity gain buffer amplifier Precision analog cable driver Transducer biasing circuits Capacitive and charge integration circuits Biochemical probe interface Signal conditioning Portable instruments High source impedance electrode amplifiers Precision Sample and Hold amplifiers Precision current to voltage converter Error correction circuits Sensor compensation circuits Precision gain amplifiers System output level shifter PIN CONFIGURATION 8 N/C 7 V+ 3 6 OUT 4 5 N/C N/C 1 -IN 2 +IN V- 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 ALD1722SAL ALD1722GSAL ALD1722PAL ALD1722GPAL ALD1722DA ALD1722GDA 2 TOP VIEW TOP VIEW SAL, PAL, DA PACKAGES * N/C pins are internally connected. Do not connect externally. * Contact factory for leaded (non-RoHS) or high temperature versions. Rev 2.1 ©2011 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+ 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 600 mW 0°C to +70°C -55°C to +125°C -65°C to +150°C +260°C OPERATING ELECTRICAL CHARACTERISTICS TA = 25oC VS = ±2.5V unless otherwise specified Parameter Symbol Supply Voltage VS V+ 1722 Typ Min ±2.0 4.0 Max Min ±5.0 10.0 ±2.0 4.0 1722G Typ Max Unit Test Conditions ±5.0 10.0 V V Single Supply 25 90 80 400 µV RS ≤ 100KΩ IOS 0.01 10 280 0.01 10 280 pA pA TA = 25°C 0°C ≤ TA ≤ +70°C Input Bias Current IB 0.01 10 280 0.01 10 280 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 Power Supply Rejection Ratio Input Offset Voltage VOS Input Offset Current -0.3 -2.8 +5.3 +2.8 -0.3 -2.8 1014 1014 4 7 PSRR 85 Common Mode Rejection Ratio CMRR 97 Large Signal Voltage Gain AV VO low VO high 4.99 0.002 4.998 0.01 Output Voltage Range VO low VO high -2.44 2.44 -2.35 2.35 50 250 500 50 Ω µV/°C RS ≤ 100KΩ 85 dB RS ≤ 100KΩ 97 dB RS ≤ 100KΩ V/mV V/mV RL =10KΩ RL ≥ 1MΩ 250 500 0.002 4.998 0.01 4.99 V V RL =1MΩ V+ = 5V 0°C ≤ TA ≤ +70°C -2.44 2.44 -2.35 2.35 V V RL =10KΩ 0°C ≤ TA ≤ +70°C Output Short Circuit Current ISC 8 8 Supply Current IS 0.8 1.5 0.8 1.5 mA VIN = 0V No Load Power Dissipation PD 4.0 7.5 4.0 7.5 mW VS = ±2.5V Input Capacitance CIN Maximum Load Capacitance CL 1 mA 1 pF 400 400 pF Gain = 1 4000 4000 pF Gain = 5 Input Noise Voltage en 26 26 nV/√ Hz f = 1KHz Input Current Noise in 0.6 0.6 fA/√ Hz f =10Hz ALD1722/ALD1722G Advanced Linear Devices 2 of 9 OPERATING ELECTRICAL CHARACTERISTICS (cont'd) TA = 25°C VS = ±2.5V unless otherwise specified (cont'd) 1722 Symbol Min Bandwidth BW 1.0 1.5 1.0 1.5 MHz Slew Rate SR 1.4 2.1 1.4 2.1 V/µs AV = +1 RL = 10KΩ Rise time tr 0.2 0.2 µs RL = 10KΩ 10 10 % RL = 10KΩ, CL = 100pF 8.0 3.0 8.0 3.0 µs µs 0.01% 0.1% AV = -1, RL= 5KΩ CL = 50pF Unit Test Conditions Overshoot Factor Settling Time ts Typ 1722G Parameter Max Min Typ Max Unit Test Conditions TA = 25°C VS = ±5.0V unless otherwise specified 1722 Min Symbol Power Supply Rejection Ratio PSRR 85 85 dB RS ≤ 100KΩ Common Mode Rejection Ratio CMRR 97 97 dB RS ≤ 100KΩ Large Signal Voltage Gain AV 250 250 V/mV RL = 10KΩ Output Voltage Range VO low VO high V RL = 10KΩ 4.80 Typ 1722G Parameter -4.90 4.93 Max Min -4.80 4.80 Typ -4.90 4.93 Max -4.80 Bandwidth BW 1.7 1.7 MHz Slew Rate SR 2.8 2.8 V/µs AV = +1, CL = 50pF VS = ±2.5V -55°C ≤ TA ≤ +125°C unless otherwise specified 1722 Symbol Input Offset Voltage VOS Input Offset Current IOS Input Bias Current IB Power Supply Rejection Ratio PSRR 85 85 dB RS ≤ 100KΩ Common Mode Rejection Ratio CMRR 97 97 dB RS ≤ 100KΩ Large Signal Voltage Gain AV 10 25 V/mV RL ≤ 10KΩ Output Voltage Range VO low VO high -2.40 2.40 V V RL ≤ 10KΩ 2.30 ALD1722/ALD1722G Min 1722G Parameter Typ Max 0.5 2.0 10 25 2.30 -2.40 2.40 Min Typ Max Unit Test Conditions 0.7 3.5 mV RS ≤ 100KΩ 2.0 2.0 nA 2.0 2.0 nA -2.30 Advanced Linear Devices -2.30 3 of 9 Design & Operating Notes: 1. The ALD1722/ALD1722G 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 ALD1722/ALD1722G 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 ALD1722/ALD1722G 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 ALD1722/ALD1722G has shown itself to be more resistant to parasitic oscillations. 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 1014Ω 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. 2. The ALD1722/ALD1722G has complementary p-channel and nchannel 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 ALD1722/ALD1722G 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. 5. ALD1722/ALD1722G 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. 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. 6. The ALD1722/ALD1722G has an internal design architecture that provides robust high temperature operation. Contact factory for custom screening versions. TYPICAL PERFORMANCE CHARACTERISTICS 0 S COMMON MODE INPUT VOLTAGE RANGE AS A FUNCTION OF SUPPLY VOLTAGE OPEN LOOP VOLTAGE GAIN AS A FUNCTION OF SUPPLY VOLTAGE AND TEMPERATURE 1000 TA = 25°C ±6 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 ±8 ±6 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) INPUT BIAS CURRENT AS A FUNCTION OF AMBIENT TEMPERATURE SUPPLY CURRENT AS A FUNCTION OF SUPPLY VOLTAGE 2.5 1000 VS = ±2.5V 100 SUPPLY CURRENT (mA) INPUT BIAS CURRENT (pA) } -55°C 10 1.0 0.1 INPUTS GROUNDED OUTPUT UNLOADED 2.0 1.5 TA = -55ºC -25°C 1.0 +25°C +80°C +125°C 0.5 0 0.01 0 -50 -25 0 25 50 75 100 125 AMBIENT TEMPERATURE (°C) ALD1722/ALD1722G Advanced Linear Devices ±1 ±2 ±3 ±4 ±5 ±6 SUPPLY VOLTAGE (V) 4 of 9 TYPICAL PERFORMANCE CHARACTERISTICS (cont'd) OUTPUT VOLTAGE SWING AS A FUNCTION OF SUPPLY VOLTAGE 120 OPEN LOOP VOLTAGE GAIN (dB) -55°C ≤ TA ≤ 125°C ±6 RL = 10KΩ ±5 RL = 10KΩ ±4 RL = 2KΩ ±3 ±2 ±1 0 ±2 ±3 ±4 ±5 ±6 ±7 100 VS = ±2.5V TA = 25°C 80 60 0 40 45 20 90 0 135 -20 180 1 10 1K 10K 100K 1M 10M FREQUENCY (Hz) SUPPLY VOLTAGE (V) OPEN LOOP VOLTAGE GAIN AS A FUNCTION OF LOAD RESISTANCE LARGE - SIGNAL TRANSIENT RESPONSE 1000 OPEN LOOP VOLTAGE GAIN (V/mV) 100 PHASE SHIFT IN DEGREES OUTPUT VOLTAGE SWING (V) ±7 OPEN LOOP VOLTAGE AS A FUNCTION OF FREQUENCY 5V/div VS = ±2.5V TA = 25°C RL = 10KΩ CL = 50pF 100 VS = ±2.5V TA = 25°C 10 1 1V/div 1K 10K 100K 2µs/div 1000K LOAD RESISTANCE (Ω) SMALL - SIGNAL TRANSIENT RESPONSE 100mV/div 20mV/div ALD1722/ALD1722G Advanced Linear Devices VS = ±2.5V TA = 25°C RL = 10KΩ CL = 50pF 2µs/div 5 of 9 TYPICAL APPLICATIONS RAIL TO RAIL VOLTAGE FOLLOWER/BUFFER RAIL-TO-RAIL WAVEFORM INPUT 5V ZIN =~ 1012Ω +5V 0V 0.1µF +5V OUTPUT 0V VIN OUTPUT CL + RL =10KΩ 400pF Performance waveforms. 0 ≤ VIN ≤ 5V Upper trace is the output of a Wien Bridge Oscillator. Lower trace is the output of Rail-to-rail voltage follower. * See rail to rail waveform PHOTO DETECTOR CURRENT TO VOLTAGE CONVERTER LOW OFFSET SUMMING AMPLIFIER 50K RF = 5M +2.5V 10K INPUT 1 INPUT 2 .01µF I OUTPUT GAIN = 5 CL = 4000pF + +5V OUTPUT + 10K -2.5V 10K .01µF RL = 10K RAIL-TO-RAIL VOLTAGE COMPARATOR +2.5V - VIN 0.1µF - +5V 50K OUTPUT + 10K R = 10K f =~ -2.5V - 2.5V WIEN BRIDGE OSCILLATOR (RAIL-TO -RAIL) SINE WAVE GENERATOR C = .01µF VOUT = I x RF PHOTODIODE .01µF + * Circuit Drives Large Load Capacitance ≤ 4000pF +2.5V - 10K 1 2πRC 10M ~ 1.6KHz * See rail to rail waveform ALD1722/ALD1722G 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 ALD1722/ALD1722G 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 ALD1722/ALD1722G 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 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 ALD1722/ALD1722G ø Advanced Linear Devices 9 of 9