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AD8672ARZ-REEL7 Datasheet(PDF) 11 Page - Analog Devices |
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AD8672ARZ-REEL7 Datasheet(HTML) 11 Page - Analog Devices |
11 / 16 page AD8671/AD8672/AD8674 Rev. C | Page 11 of 16 APPLICATIONS UNITY-GAIN FOLLOWER APPLICATIONS When large transient pulses (>1 V) are applied at the positive terminal of amplifiers (such as the OP27, LT1007, OPA227, and AD8671) with back-to-back diodes at the input stage, the use of a resistor in the feedback loop is recommended to avoid having the amplifier load the signal generator. The feedback resistor, RF, should be at least 500 Ω. However, if large values must be used for RF, a small capacitor, CF, should be inserted in parallel with RF to compensate for the pole introduced by the input capacitance and RF. Figure 32 shows the uncompensated output response with a 10 kΩ resistor in the feedback and the compensated response with CF = 15 pF. REF1 +OVER 23.23% CH2 +OVER 7.885% OUTPUT UNCOMPENSATED OUTPUT COMPENSATED TIME (100ns/DIV) Figure 32. Transient Output Response OUTPUT PHASE REVERSAL Phase reversal is a change of polarity in the amplifier transfer function that occurs when the input voltage exceeds the supply voltage. The AD8671/AD8672/AD8674 do not exhibit phase reversal even when the input voltage is 1 V beyond the supplies. VSY = ±15V VIN VOUT TIME (10 μs/DIV) Figure 33. Output Phase Reversal TOTAL NOISE VS. SOURCE RESISTANCE The low input voltage noise of the AD8671/AD8672/AD8674 makes them a great choice for applications with low source resistance. However, because they have low input current noise, they can also be used in circuits with substantial source resistance. Figure 34 shows the voltage noise, current noise, thermal noise, and total rms noise of the AD8671 as a function of the source resistance. For RS < 475 Ω, the input voltage noise, en, dominates. For 475 Ω < RS < 412 kΩ, thermal noise dominates. For RS > 412 kΩ, the input current noise dominates. 10 1k 1 10 100 1000 100 10k 100k 1M en_t C A B en in (4kRST)1/2 SOURCE RESISTANCE ( Ω) Figure 34. Noise vs. Source Resistance |
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