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AD8606ARM-REEL Datasheet(PDF) 13 Page - Analog Devices |
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AD8606ARM-REEL Datasheet(HTML) 13 Page - Analog Devices |
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13 / 20 page  AD8605/AD8606/AD8608 Rev. D | Page 13 of 20 APPLICATION INFORMATION OUTPUT PHASE REVERSAL Phase reversal is defined as a change in polarity at the output of the amplifier when a voltage that exceeds the maximum input common-mode voltage drives the input. Phase reversal can cause permanent damage to the amplifier; it may also cause system lockups in feedback loops. The AD8605 does not exhibit phase reversal even for inputs exceeding the supply voltage by more than 2 V. TIME (4 µs/DIV) VOUT VIN VS = ±2.5V VIN = 5V p-p AV = 1 RL = 10kΩ Figure 43. No Phase Reversal MAXIMUM POWER DISSIPATION Power dissipated in an IC causes the die temperature to increase. This can affect the behavior of the IC and the application circuit performance. The absolute maximum junction temperature of the AD8605/ AD8606/AD8608 is 150°C. Exceeding this temperature could cause damage or destruction of the device. The maximum power dissipation of the amplifier is calculated according to the following formula: JA A J DISS T T P θ − = where: TJ = junction temperature TA = ambient temperature θJA = junction to-ambient-thermal resistance Figure 44 compares the maximum power dissipation with temperature for the various AD8605 family packages. TEMPERATURE (°C) 1.0 0.8 0 0 100 20 40 60 80 0.6 0.4 0.2 SOIC-14 2.0 1.8 1.6 1.4 1.2 SOIC-8 SOT-23 MSOP TSSOP Figure 44. Maximum Power Dissipation vs. Temperature INPUT OVERVOLTAGE PROTECTION The AD8605 has internal protective circuitry. However, if the voltage applied at either input exceeds the supplies by more than 2.5 V, external resistors should be placed in series with the inputs. The resistor values can be determined by the formula ( ) () mA R V V S S IN 5 200 ≤ Ω + − The remarkable low input offset current of the AD8605 (<1 pA) allows the use of larger value resistors. With a 10 kΩ resistor at the input, the output voltage has less than 10 nV of error voltage. A 10 kΩ resistor has less than 13 nV/√Hz of thermal noise at room temperature. THD + NOISE Total harmonic distortion is the ratio of the input signal in V rms to the total harmonics in V rms throughout the spectrum. Harmonic distortion adds errors to precision measurements and adds unpleasant sonic artifacts to audio systems. The AD8605 has a low total harmonic distortion. Figure 45 shows that the AD8605 has less than 0.005% or −86 dB of THD + N over the entire audio frequency range. The AD8605 is configured in positive unity gain, which is the worst case, and with a load of 10 kΩ. |
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