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AD8382 Datasheet(PDF) 5 Page - Analog Devices |
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AD8382 Datasheet(HTML) 5 Page - Analog Devices |
5 / 24 page AD8382 ABSOLUTE MAXIMUM RATINGS Table 2. Absolute Maximum Ratings1 Parameter Rating Supply Voltages AVCCx to AGNDx 18 V DVCC to DGND 4.5 V Input Voltages Maximum Digital Input Voltage DVCC + 0.5 V Minimum Digital Input Voltage DGND – 0.5 V Maximum Analog Input Voltage AVCC + 0.5 V Minimum Analog Input Voltage AGND – 0.5 V Internal Power Dissipation2 LFCSP Package @ 25°C Ambient 3.84 W Operating Temperature Range 0°C to 85°C Storage Temperature Range –65°C to +125°C Lead Temperature Range (Soldering 10 sec) 300°C 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 absolute maximum ratings for extended periods may reduce device reliability. 2 48-lead LFCSP Package: θ JA = 26°C/W (JEDEC STD, 4-layer PCB in still air) θ JC = 20°C/W. ΨJB = 11°C/W in Still Air OVERLOAD PROTECTION The AD8382 employs a two-stage overload protection circuit that consists of an output current limiter and a thermal shutdown. The maximum current at any output of the AD8382 is internally limited to 100 mA average. In the event of a momentary 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 power supply rail, the output amplifier current continues to switch between 0 mA and 100 mA typ. with a period set by the thermal time constant and hysteresis of the thermal trip point. The thermal shutdown provides long-term protection by limiting average junction temperature to a safe level. EXPOSED PADDLE To ensure a high degree of reliability, the exposed paddle must be electrically connected to AVCC. To ensure optimized thermal performance, the exposed paddle must be thermally connected to the AVCC plane as described in the Applications section. MAXIMUM POWER DISSIPATION The maximum power that the AD8382 can safely dissipate is limited by its junction temperature. The maximum safe junction temperature for plastic encapsulated devices, as determined by the plastic’s glass transition temperature, is approximately 150°C. Temporarily exceeding this limit may cause a shift in parametric performance due to a change in stresses exerted on the die by the package. Exceeding a junction temperature of 175°C for extended periods can result in device failure. OPERATING TEMPERATURE RANGE Although the maximum safe operating junction temperature is higher, the AD8382 is 100% tested at a junction temperature of 125°C. Consequently, the maximum guaranteed operating junction temperature is 125°C. To ensure operation within the specified operating temperature range, it is necessary to limit the maximum power dissipation to: ) 3 9 . 0 – (θ ) – ( lfm in Airflow T T P JA A JMAX DMAX × ≈ where TJMAX = 125°C MAXIMUM AMBIENT TEMPERATURE (°C) 0.50 0.75 1.00 1.25 1.50 1.75 2.00 65 90 95 100 105 110 85 80 75 70 115 STILL AIR AD8382 ON A 4–LAYER JEDEC PCB WITH THERMALLY OPTIMIZED LANDING PATTERN AS DESCRIBED IN THE APPLICATION NOTES 200 lfm 500 lfm 60Hz XGA 120MHz Quiescent Figure 2. Maximum Power Dissipation vs. Temperature. Note: Quiescent power dissipation is 0.74 W when operating under the conditions specified in this data sheet. When driving a 6-channel XGA panel with an input capacitance of 200 pF, the AD8382 dissipates a total of 1.14 W when displaying 1 pixel wide alternating white and black vertical lines generated by a standard 60 Hz XGA input video. The total power dissipation of the AD8382 is 1.67 W when operating at the maximum specified frequency of 120 MHz, under the conditions specified in this data sheet (Figure 2). Rev. 0 | Page 5 of 24 |
Número de pieza similar - AD8382_15 |
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Descripción similar - AD8382_15 |
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