AD826 DATASHEET PDF

Excellent DC Performance: 2. It is ideal for use in applications which require unity gain stability and high output drive capability, such as buffering and cable driving. With a low power supply current of 15 mA max for both amplifiers, the AD is a true general purpose operational amplifier. The AD is ideal for power sensitive applications such as video cameras and portable instrumentation. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use.

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Excellent DC Performance: 2. It is ideal for use in applications which require unity gain stability and high output drive capability, such as buffering and cable driving. With a low power supply current of 15 mA max for both amplifiers, the AD is a true general purpose operational amplifier. The AD is ideal for power sensitive applications such as video cameras and portable instrumentation. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use.

No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P. Box , Norwood, MA , U. Analog Devices, Inc. Specifications subject to change without notice. Electrostatic charges as high as volts, which readily accumulate on the human body and on test equipment, can discharge without detection. Although the AD features proprietary ESD protection circuitry, permanent damage may still occur on these devices if they are subjected to high energy electrostatic discharges.

Therefore, proper ESD precautions are recommended to avoid any performance degradation or loss of functionality. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational 1.

Exposure to absolute maximum rating conditions for extended periods may affect device reliability. C Maximum Power Dissipation vs. Volts Figure 1. Common-Mode Voltage Range vs. Volts Figure 2. Output Voltage Swing vs. Figure 3. Load Resistance 7.

Volts Figure 4. Quiescent Supply Current per Amp vs. Volts Figure 5. Slew Rate vs. Closed-Loop Output Impedance vs. Frequency —4— REV. C Figure 7. Input Bias Current vs. C Figure 8. Short Circuit Current vs. C 20 Figure 9. Unity Gain Bandwidth and Phase Margin vs. Open-Loop Gain and Phase Margin vs. Frequency 7? Figure Open-Loop Gain vs.

Power Supply Rejection vs. Frequency REV. Common-Mode Rejection vs. Large Signal Frequency Response 10 0. Output Swing and Error vs. Harmonic Distortion vs. C Figure Temperature —6— REV. Closed-Loop Gain vs. Frequency AD 5 4 1k? Differential Gain and Phase vs. Gain Flatness Matching vs. Crosstalk vs. Frequency M? B —7— AD 1k? F —VS Figure It also achieves a constant slew rate, bandwidth and settling time over its entire specified temperature range. The output buffer stage employs emitter followers in a class AB amplifier which delivers the necessary current to the load while maintaining low levels of distortion.

Simplified Schematic The capacitor, CF, in the output stage mitigates the effect of capacitive loads. With low capacitive loads, the gain from the compensation node to the output is very close to unity. In this case, CF is bootstrapped and does not contribute to the overall compensation capacitance of the device.

As the capacitive load is increased, a pole is formed with the output impedance of the output stage. This reduces the gain, and therefore, CF is incompletely bootstrapped. Effectively, some fraction of CF contributes to the overall compensation capacitance, reducing the unity gain bandwidth. As the load capacitance is further increased, the bandwidth continues to fall, maintaining the stability of the amplifier. This resistor provides protection for the input transistors by limiting their maximum base current.

The balancing resistor equals the parallel combination of RIN and RF and thus provides a matched impedance at each input terminal.

The offset voltage error will then be reduced by more than an order of magnitude. The AD offers excellent static and dynamic matching characteristics, combined with the ability to drive heavy resistive and capacitive loads. As with all high frequency circuits, care should be taken to maintain overall device performance as well as their matching.

The following items are presented as general design considerations. Circuit Board Layout Input and output runs should be laid out so as to physically isolate them from remaining runs. In addition, the feedback resistor of each amplifier should be placed away from the feedback resistor of the other amplifier, since this greatly reduces inter-amp coupling.

Since the summing junction capacitance may cause peaking, a small capacitor 1 pF—5 pF may be paralleled with RF to neutralize this effect.

Finally, sockets should be avoided, because of their tendency to increase interlead capacitance. Power Supply Bypassing Proper power supply decoupling is critical to preserve the integrity of high frequency signals.

In carefully laid out designs, decoupling capacitors should be placed in close proximity to the supply pins, while their lead lengths should be kept to a minimum. Though two 0. F capacitors will typically be effective in decoupling the supplies, several capacitors of different values can be paralleled to cover a wider frequency range. B AD? The AD is ideally suited for applications that require low power dissipation and high output current and those which need to drive large capacitive loads, such as high speed buffering and instrumentation.

Referring to Figure 36, careful consideration should be given to the proper selection of component values. R2 combine with C1 to form a low frequency corner of approximately 30 Hz. VS R3 1k? F R1 9k? F VIN R2 10k? In this configuration, the output is centered around 2. In order to eliminate the static dc current associated with this level, C3 was inserted in series with RL. Here, two identical cells are paralleled to obtain even higher load driving capability than that of a single amplifier mA min guaranteed.

R1 and R2 are included to limit current flow between amplifier outputs that would arise in the presence of any residual mismatch. VIN 1k? In this application, the AD high speed video difference amp serves as the differential line receiver on the end of a back terminated, 50 ft. Figure 39 is the pulse response with a 2 V p-p, 1 MHz signal input. BNC 5pF 1. Pulse Response? AD 36? F —15V 0. F Figure Differential Line Driver 0.

In this arrangement the AD can comfortably drive a 75?

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The model number is a specific version of a generic that can be purchased or sampled. Status Status indicates the current lifecycle of the product. This can be one of 4 stages: Pre-Release: The model has not been released to general production, but samples may be available. Production: The model is currently being produced, and generally available for purchase and sampling. Last Time Buy: The model has been scheduled for obsolescence, but may still be purchased for a limited time. Obsolete: The specific part is obsolete and no longer available.

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