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AD8565 Fiches technique(PDF) 9 Page - Analog Devices |
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AD8565 Fiches technique(HTML) 9 Page - Analog Devices |
9 / 12 page AD8565/AD8566/AD8567 –9– REV. A Output Phase Reversal The AD856x family is immune to phase reversal. Although the device’s output will not change phase, large currents due to input overvoltage could damage the device. In applications where the possibility of an input voltage exceeding the supply voltage exists, overvoltage protection should be used as described in the previous section. Power Dissipation The maximum allowable internal junction temperature of 150 °C limits the AD856x family Maximum Power Dissipation. As the ambient temperature increases, the maximum power dissipated by the AD856x family must decrease linearly to maintain the maximum junction temperature. If this maximum junction temperature is exceeded momentarily, the part will still operate properly once the junction temperature is reduced below 150 °C. If the maximum junction temperature is exceeded for an extended period of time, overheating could lead to permanent damage of the device. The maximum safe junction temperature, TJMAX, is 150 °C. Using the following formula, we can obtain the maximum power that the AD856x family can safely dissipate as a function of temperature. PDISS = TJMAX – TA/ θJ A where: PDISS = AD856x power dissipation TJMAX = AD856x maximum allowable junction temp (150 °C) TA = Ambient Temperature of the circuit θJA = AD856x package thermal resistance, junction-to-ambient The power dissipated by the device can be calculated as; PDISS = (VS – VOUT) ILOAD where: VS = supply voltage VOUT = output voltage ILOAD = output load current Figure 3 shows the maximum power dissipation versus temperature. To achieve proper operation, use the previous equation to calculate PDISS for a specific package at any given temperature, or use the chart below. AMBIENT TEMPERATURE – C 1.25 0.75 0 –35 0.50 0.25 14-LEAD SOIC 5-LEAD SOT-23 8-LEAD MSOP 14-LEAD TSSOP 1.00 –15 5 25456585 Figure 3. Maximum Power Dissipation vs. Temperature for 5-, 8-, and 14-Lead Packages THD + N The AD856x family features low total harmonic distortion. Figure 4 shows a graph of THD + N versus frequency. The Total Harmonic Distortion plus Noise for the AD856x over the entire supply range is below 0.008%. When the device is powered from a 16 V supply, the THD + N stays below 0.003%. Figure 4 shows the AD8566 in a unity noninverting configuration. FREQUENCY – Hz 20 30k 100 1k 10k 10 1 0.01 0.1 VS = 2.5V VS = 8V Figure 4. THD + N vs. Frequency Graph Short Circuit Output Conditions The AD856x family does not have internal short circuit protection circuitry. As a precautionary measure, it is recommended not to short the output directly to the positive power supply or to ground. It is not recommended to operate the AD856x with more than 35 mA of continuous output current. The output current can be limited by placing a series resistor at the output of the amplifier whose value can be derive using the following equation: R V mA X S ≥ 35 For a 5 V single supply operation, RX should have a minimum value of 143 Ω. LCD Panel Applications The AD856x amplifier is designed for LCD panel applications or applications where large capacitive load drive is required. It can instantaneously source/sink greater than 250 mA of current. At unity gain, it can drive 1 µF without compensation. This makes the AD856x ideal for LCD VCOM driver applications. To evaluate the performance of the AD856x family, a test circuit was developed to simulate the VCOM Driver application for an LCD panel. |
Numéro de pièce similaire - AD8565 |
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Description similaire - AD8565 |
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