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ALD2732ADA Datasheet(PDF) 4 Page - Advanced Linear Devices |
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ALD2732ADA Datasheet(HTML) 4 Page - Advanced Linear Devices |
4 / 9 page ALD2732A/ALD2732 Advanced Linear Devices 4 of 9 Design & Operating Notes: 1. The ALD2732A/ALD2732 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 ALD2732A/ALD2732 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 ALD2732A/ALD2732 will typically drive 400pF of external load ca- pacitance without stability problems. In the inverting unity gain con- figuration, it can drive up to 800pF of load capacitance. Compared to other CMOS operational amplifiers, the ALD2732A/ALD2732 has shown itself to be more resistant to parasitic oscillations. 2. The ALD2732A/ALD2732 has complementary p-channel and n-chan- nel 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 above the negative supply voltage. Since offset voltage trimming on the ALD2732A/ALD2732 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 how- ever, 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 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. 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 ALD2732A/ALD2732 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 not to exceed 0.3V of the power supply voltage levels. 6. The ALD2732A/ALD2732 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 SUPPLY VOLTAGE (V) 2.5 1.5 0 0.5 2.0 1.0 0 ±1 ±2 ±3 ±4 ±5 ±6 INPUTS GROUNDED OUTPUT UNLOADED -25°C +25°C +80°C +125°C TA = -55ºC COMMON MODE INPUT VOLTAGE RANGE AS A FUNCTION OF SUPPLY VOLTAGE SUPPLY VOLTAGE (V) ±5 ±3 0 ±1 ±4 ±2 0 ±1 ±2 ±3 ±4 ±5 ±6 ±6 TA = 25°C OPEN LOOP VOLTAGE GAIN AS A FUNCTION OF SUPPLY VOLTAGE AND TEMPERATURE SUPPLY VOLTAGE (V) 1000 100 10 1 0 ±1 ±2 ±3 ±4 ±5 ±6 -55°C { +25°C { +125°C { RL= 10KΩ RL= 5KΩ INPUT BIAS CURRENT AS A FUNCTION OF AMBIENT TEMPERATURE AMBIENT TEMPERATURE (°C) 100 10 1.0 0.01 0.1 1000 +100 -25 0 +75 +125 +50 +25 -50 VS = ±2.5V |
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