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AD8139 датащи(PDF) 7 Page - Analog Devices |
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AD8139 датащи(HTML) 7 Page - Analog Devices |
7 / 24 page AD8139 Rev. A | Page 7 of 24 ABSOLUTE MAXIMUM RATINGS Table 3. Parameter Rating Supply Voltage 12 V VOCM ±VS Power Dissipation See Figure 3 Input Common-Mode Voltage ±VS Storage Temperature –65°C to +125°C Operating Temperature Range –40°C to +125°C Lead Temperature Range (Soldering 10 sec) 300°C Junction Temperature 150°C Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rat- ing only; functional operation of the device at these or any other conditions above those indicated in the operational sec- tion of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. THERMAL RESISTANCE θJA is specified for the worst-case conditions, i.e., θJA is specified for device soldered in circuit board for surface-mount packages. Table 4. Thermal Resistance Package Type θJA Unit SOIC-8 with EP/4-Layer 70 °C/W LFCSP/4-Layer 70 °C/W Maximum Power Dissipation The maximum safe power dissipation in the AD8139 package is limited by the associated rise in junction temperature (TJ) on the die. At approximately 150°C, which is the glass transition tem- perature, the plastic will change its properties. Even temporarily exceeding this temperature limit may change the stresses that the package exerts on the die, permanently shifting the parametric performance of the AD8139. Exceeding a junction temperature of 175°C for an extended period of time can result in changes in the silicon devices potentially causing failure. The power dissipated in the package (PD) is the sum of the quiescent power dissipation and the power dissipated in the package due to the load drive for all outputs. The quiescent power is the voltage between the supply pins (VS) times the quiescent current (IS). The load current consists of differential and common-mode currents flowing to the load, as well as currents flowing through the external feedback networks and the internal common-mode feedback loop. The internal resistor tap used in the common-mode feedback loop places a 1 kΩ differential load on the output. RMS output voltages should be considered when dealing with ac signals. Airflow reduces θJA. Also, more metal directly in contact with the package leads from metal traces, through holes, ground, and power planes will reduce the θJA. Figure 3 shows the maximum safe power dissipation in the package versus the ambient temperature for the exposed paddle (EP) SOIC-8 (θJA = 70°C/W) package and LFCSP (θJA = 70°C/W) on a JEDEC standard 4-layer board. θJA values are approximations. 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 –40 –20 0 20 40 60 80 100 120 AMBIENT TEMPERATURE ( °C) SOIC AND LFCSP Figure 3. Maximum Power Dissipation vs. Temperature for a 4-Layer Board ESD CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although this product features proprie- tary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. |
Аналогичный номер детали - AD8139 |
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Аналогичное описание - AD8139 |
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