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AD8560 Datasheet(PDF) 9 Page - Analog Devices |
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AD8560 Datasheet(HTML) 9 Page - Analog Devices |
9 / 12 page –9– AD8560 REV. 0 APPLICATIONS Theory of Operation These buffers are designed to drive large capacitive loads in LCD applications. Each has a high output current drive and rail-to- rail input/output operation and can be powered from a single 16 V supply. They are also intended for other applications where low distortion and high output current drive are needed. Input Overvoltage Protection As with any semiconductor device, whenever the input exceeds either supply voltage, attention needs to be paid to the input overvoltage characteristics. As an overvoltage occurs, the amplifier could be damaged depending on the voltage level and the magnitude of the fault current. When the input voltage exceeds either supply by more than 0.6 V, internal pin junctions will allow current to flow from the input to the supplies. This input current is not inherently damaging to the device as long as it is limited to 5 mA or less. If a condition exists using the buffers where the input exceeds the supply by more than 0.6 V, a series external resistor should be added. The size of the resistor can be calculated by using the maximum overvoltage divided by 5 mA. This resistance should be placed in series with the input exposed to an overvoltage. Output Phase Reversal The buffer 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 exists of an input voltage exceeding the supply voltage, overvoltage protec- tion should be used as described in the previous section. Total Harmonic Distortion (THD+N) The buffer family features low total harmonic distortion. The total harmonic distortion plus noise for the buffer over the entire supply range is below 0.08%. When the device is powered from a 16 V supply, the THD + N stays below 0.03%. Figure 1 shows the AD8560’s THD + N versus the frequency performance. FREQUENCY – Hz 20 30k 100 1k 10k 10 1 0.01 0.1 VS = 2.5V VS = 8V Figure 1. THD + N vs. Frequency Short Circuit Output Conditions The buffer family does not have internal short circuit protection circuitry. As a precautionary measure, do not short the output directly to the positive power supply or to the ground. It is not recommended to operate the AD8560 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 derived 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. Recommended Land Pattern for the AD8560 Figure 2 is a recommended land pattern for the AD8560 PCB design. The recommended thermal pad size for the PCB design matches the dimensions of the exposed pad on the bottom of the package. The solder mask design for improved thermal pad contact to the exposed pad and reliability uses a stencil pattern for approximately 85% solder coverage. A minimum clearance of 0.25 mm is maintained on the PCB between the outer edges of the thermal pad and the inner edges of the pattern for the land to avoid shorting. For better thermal performance, thermal vias should also be used. Since the AD8560 is relatively a low power part, just soldering the exposed package pad to the PCB thermal pad should provide sufficient electrical performance. 0.65 SOLDER MASK BOARD METALLIZATION 1.95 2.1 0.25 0.875 0.20 0.05 0.1 0.4 0.9 0.28 0.75 TYP 16 PL SYMM CL SYMM CL Figure 2. 16-Lead 4 x 4 Land Pattern |
Número de pieza similar - AD8560_15 |
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Descripción similar - AD8560_15 |
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