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AD8698 Arkusz danych(PDF) 16 Page - Analog Devices |
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AD8698 Arkusz danych(HTML) 16 Page - Analog Devices |
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16 / 20 page  AD8698 Rev. 0 | Page 16 of 20 LOW NOISE APPLICATIONS In some applications, it is critical to minimize the noise, and although the AD8698 has a low noise of typically 8 nV/√Hz at 1 kHz, paralleling the two amplifiers within the same package reduces the total noise referred to the input to approximately 5.5 nV/√Hz. This simple technique is depicted in Figure 55. V– V+ V+ R4 10k Ω V– R2 10k Ω VOUT VIN R3 1k Ω R1 1k Ω R5 100 Ω R3 100 Ω Figure 55. Paralleling Amplifiers DRIVING ADCs The AD8698 can drive extremely heavy capacitive loads without any compensation. Sometimes capacitors are placed at the output of the amplifier to absorb transient currents while the op amp is interfaced with the ADC. Most op amps need a small resistor with the output to isolate the load capacitance. This results in a loss of bandwidth and slows the amplifier down substantially. However, the AD8698 maintains a unity gain bandwidth of 1 MHz with loads of up to 1 nF, as shown in Figure 52. USING THE AD8698 IN ACTIVE FILTER DESIGNS The AD8698 is recommended for unity gain filter designs with a corner frequency of up to 100 kHz, one tenth of the op amp’s unity gain bandwidth. If a higher gain is desired, the corner frequency should be chosen accordingly. For example, if the amplifier is configured with a gain of 10, the corner frequency of the filter should not be more than 10 kHz. An example of an active filter is the Sallen Key. This topology gives the user the flexibility of implementing a low-pass or a high-pass filter by simply interchanging the resistors and the capacitors. In the high-pass filter of Figure 56, the damping factor Q is set to 1/√2 for a maximally flat response (Butterworth). The gain is unity and the bandwidth is 10 kHz with the values shown. V– V+ R2 22k Ω R1 11k Ω C1 1nF C2 1nF VIN Figure 56. Two Pole High-Pass Filter V– V+ R2 11k Ω R1 11k Ω C1 2nF C2 1nF VIN Figure 57. Two Pole Low-Pass Filter The circuit of Figure 57 has a bandwidth of 10 kHz and a maximally flat response. In this case, the damping factor is controlled by the ratio of the capacitors and the gain is unity. |
Podobny numer części - AD8698 |
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Podobny opis - AD8698 |
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