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AD8381AST-REEL Datasheet(PDF) 4 Page - Analog Devices |
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AD8381AST-REEL Datasheet(HTML) 4 Page - Analog Devices |
4 / 16 page REV. 0 AD8381 –4– ABSOLUTE MAXIMUM RATINGS 1 Supply Voltages AVCCx – AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 V DVCC – DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V Input Voltages Maximum Digital Input Voltages . . . . . . . . DVCC + 0.5 V Minimum Digital Input Voltages . . . . . . . . DGND – 0.5 V Maximum Analog Input Voltages . . . . . . . . . AVCC + 0.5 V Minimum Analog Input Voltages . . . . . . . . AGND – 0.5 V Internal Power Dissipation 2 LQFP Package @ 25 °C Ambient . . . . . . . . . . . . . . . . 2.7 W Output Short Circuit Duration . . . . . . . . . . . . . . . . . . Infinite Operating Temperature Range . . . . . . . . . . . . . . 0 °C to 85°C Storage Temperature Range . . . . . . . . . . . . –65 °C to +125°C Lead Temperature Range (Soldering 10 sec) . . . . . . . . 300 °C NOTES 1Stresses above those listed under the Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to the absolute maximum ratings for extended periods may reduce device reliability. 248-lead LQFP Package: θ JA = 45 °C/W (Still Air, 4-Layer PCB) θ JC = 19 °C/W Overload Protection The AD8381 employs a two-stage overload protection circuit that consists of an output current limiter and a thermal shutdown. The maximum current at any one output of the AD8381 is internally limited to 100 mA average. In the event of a momen- tary short-circuit between a video output and a power supply rail (VCC or AGND), the output current limit is sufficiently low to provide temporary protection. The thermal shutdown “debiases” the output amplifier when the junction temperature reaches the internally set trip point. In the event of an extended short-circuit between a video output and a power supply rail, the output amplifier current continues to switch between 0 mA and 100 mA typ with a period determined by the thermal time constant and the hysteresis of the thermal trip point. The thermal shutdown provides long term protection by limiting the average junction temperature to a safe level. Recovery from a momentary short-circuit is fast, approximately 100 ns. Recovery from a thermal shutdown is slow and is dependent on the ambient temperature. MAXIMUM POWER DISSIPATION The maximum power that can be safely dissipated by the AD8381 is limited by its junction temperature. The maximum safe junc- tion temperature for plastic encapsulated devices is determined by the glass transition temperature of the plastic, approximately 150 °C. Exceeding this limit temporarily may cause a shift in the parametric performance due to a change in the stresses exerted on the die by the package. Exceeding a junction temperature of 175 °C for an extended period can result in device failure. To ensure proper operation within the specified operating tem- perature range, it is necessary to limit the maximum power dissipation as follows: PDMAX = (TJMAX – TA)/ θ JA where TJMAX = 150 °C. AMBIENT TEMPERATURE – C 3.5 0 3.0 2.5 2.0 1.5 1.0 0.5 10 20 30 40 50 60 70 80 90 Figure 4. Maximum Power Dissipation vs. Temperature ORDERING GUIDE Temperature Package Package Model Range Description Option AD8381AST 0 °C to 85°C 48-Lead LQFP ST-48 AD8381AST-REEL Reel 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 the AD8381 features proprietary 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. WARNING! ESD SENSITIVE DEVICE |
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