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AD8592ARM Arkusz danych(PDF) 9 Page - Analog Devices |
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AD8592ARM Arkusz danych(HTML) 9 Page - Analog Devices |
9 / 15 page AD8591/AD8592/AD8594 –9– REV. A In any application, the absolute maximum junction temperature must be limited to +150 °C. If this junction temperature is ex- ceeded, the device could suffer premature failure. If the output voltage and output current are in phase, for example, with a purely resistive load, the power dissipated by the AD859x can be found as: PI V V ISS SY OUT D LOAD =× () – (4) Where ILOAD = AD859x output load current VSY = AD859x supply voltage; and VOUT = The output voltage By calculating the power dissipation of the device and using the thermal resistance value for a given package type, the maximum allowable ambient temperature for an application can be found using Equation 3. Capacitive Loading The AD859x exhibits excellent capacitive load driving capabilities and can drive up to 10 nF directly. Although the device is stable with large capacitive loads, there is a decrease in amplifier band- width as the capacitive load increases. Figure 31 shows a graph of the AD8592 unity gain bandwidth under various capacitive loads. CAPACITIVE LOAD – nF 4 3.5 0 0.01 100 0.1 110 2 1.5 1 0.5 3 2.5 VS = 2.5V RL = 1k TA = +25 C Figure 31. Unity Gain Bandwidth vs. Capacitive Load When driving heavy capacitive loads directly from the AD859x output, a snubber network can be used to improve transient response. This network consists of a series R-C connected from the amplifier’s output to ground, placing it in parallel with the capacitive load. The configuration is shown in Figure 32. Al- though this network will not increase the bandwidth of the am- plifier, it will significantly reduce the amount of overshoot, as shown in Figure 33. +5V RS 5 VOUT VIN 100mV p-p AD8592 CL 47nF CS 1 F Figure 32. Configuration for Snubber Network to Compensate for Capacitive Loads 10 0% 10 s 50mV 100 90 50mV 47nF LOAD ONLY SNUBBER IN CIRCUIT Figure 33. Snubber Network Reduces Overshoot and Ringing Caused from Driving Heavy Capacitive Loads The optimum values for the snubber network should be determined empirically based on the size of the capacitive load. Table I shows a few sample snubber network values for a given load capacitance. Table I. Snubber Networks for Large Capacitive Loads Load Capacitance Snubber Network (CL)(RS, CS) 0.47 nF 300 Ω, 0.1 µF 4.7 nF 30 Ω, 1 µF 47 nF 5 Ω, 1 µF A PC-98 Compliant Headphone/Speaker Amplifier Because of its high output current performance and shutdown feature, the AD8592 makes an excellent amplifier for driving an audio output jack in a computer application. Figure 34 shows how the AD8592 can be interfaced with an AC97 codec to drive headphones or speakers. U1-A R2 2k 4 C1 100 F +5V 1 10 2 3 5 +5V VDD VDD LEFTOUT AD1881 (AC97) RIGHTOUT VSS R4 20 +5V R1 100k 7 8 6 9 R5 20 C2 100 F NOTE: ADDITIONAL PINS OMITTED FOR CLARITY U1-B U1 = AD8592 R3 2k NC 28 35 36 Figure 34. A PC-98 Compliant Headphone/Line Out Amplifier When headphones are plugged into the jack, the normalizing con- tacts disconnect from the audio contacts. This allows the voltage to the AD8592 shutdown pins to be pulled up to +5 V, activating the amplifiers. With no plug in the output jack, the shutdown voltage is pulled to 100 mV through the R1 and R3 + R5 voltage divider. This powers the AD8592 down when it is not needed, saving current from the power supply or battery. |
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