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ALD2706B Datasheet(PDF) 4 Page - Advanced Linear Devices |
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ALD2706B Datasheet(HTML) 4 Page - Advanced Linear Devices |
4 / 9 page ALD2706A/ALD2706B Advanced Linear Devices 4 of 9 ALD2706 TYPICAL PERFORMANCE CHARACTERISTICS INPUT BIAS CURRENT AS A FUNCTION OF AMBIENT TEMPERATURE AMBIENT TEMPERATURE (°C) 1000 100 10 0.1 1.0 100 -25 0 75 125 50 25 -50 10000 VS = ±2.5V COMMON MODE INPUT VOLTAGE RANGE AS A FUNCTION OF SUPPLY VOLTAGE SUPPLY VOLTAGE (V) ±7 ±6 ±5 ±4 ±3 ±2 ±1 0 0 ±1 ±2 ±3 ±4 ±5 ±6 ±7 TA = 25°C Design & Operating Notes: 1. The ALD2706A/ALD2706B/ALD2706 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 ALD2706A/ALD2706B/ALD2706 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 ALD2706A/ALD2706B/ALD2706 has complementary p-channel and n-channel 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 below the positive supply voltage. Since offset voltage trimming on the ALD2706A/ALD2706B/ALD2706 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 above 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. 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 1012Ω 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 ALD2706A/ALD2706B/ALD2706 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 ALD2706A/ALD2706B/ALD2706, 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. SUPPLY CURRENT AS A FUNCTION OF SUPPLY VOLTAGE SUPPLY VOLTAGE (V) 160 80 120 0 40 0 ±1 ±2 ±3 ±4 ±5 ±6 TA = -55°C +25°C +70°C +125°C INPUTS GROUNDED OUTPUT UNLOADED -25°C OPEN LOOP VOLTAGE GAIN AS AFUNCTION OF LOAD RESISTANCE 10M LOAD RESISTANCE (Ω) 10K 100K 1M 1000 100 10 1 VS = ±2.5V TA = 25°C |
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Similar Description - ALD2706B |
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