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ISL59118IRUZ-T7 датащи(PDF) 8 Page - Intersil Corporation |
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ISL59118IRUZ-T7 датащи(HTML) 8 Page - Intersil Corporation |
8 / 10 page 8 FN6317.2 September 22, 2006 Application Information The ISL59118 is a single-supply rail-to-rail dual (two composite channel) video amplifier with internal sync tip clamps, a typical -3dB bandwidth of 9MHz and slew rate of about 40V/µs. This part is ideally suited for applications requiring high performance with very low power consumption. As the performance characteristics and features illustrate, the ISL59118 is optimized for portable video applications. Internal Sync Clamp Embedded video DACs typically use ground as their most negative supply. This places the sync tip voltage at a minimum of 0V. Presenting a 0V input to most single supply amplifiers will saturate the output stage of the amplifier resulting in a clipped sync tip and degraded video image. The ISL59118 features an internal sync clamp and offset function that level shifts the entire video signal to the optimum level before it reaches the amplifiers’ input stage. These features also help avoid saturation of the output stage of the amplifier by setting the signal closer to the best voltage range. The simplified block diagram on the front page shows the basic operation of the ISL59118’s sync clamp. The inputs’ AC-coupled video sync signal is pulled negative by a current source at the input. When the sync tip goes below the comparator threshold, the comparator output goes high, pulling up on the input through the diode, forcing current into the coupling capacitor until the voltage at the input is again 0V, and the comparator turns off. This forces the sync tip clamp to always be 0V, setting the offset for the entire video signal. The Sallen Key Low Pass Filter The Sallen Key is a classic low pass configuration. This provides a very stable low pass function, and in the case of the ISL59118, a three-pole roll-off at 9MHz. The three-pole function is accomplished with an RC low pass network placed in series with and before the Sallen Key. One pole provided by the RC network and poles two and three provided by the Sallen Key for a nice three-pole roll-off at 9MHz. Output Coupling The ISL59118 can be AC or DC coupled to its output. When AC coupling, a 220µF coupling capacitor is recommended to ensure that low frequencies are passed, preventing video “tilt” or “droop” across a line. The ISL59118’s internal sync clamp makes it possible to DC couple the output to a video load, eliminating the need for any AC coupling capacitors, saving board space, cost, and eliminating any “tilt” or offset shift in the output signal. The trade off is larger supply current draw, since the DC component of the signal is now dissipated in the load resistor. Typical load current for AC coupled signals is 5mA compared to 10mA for DC coupling. Output Drive Capability The ISL59118 does not have internal short circuit protection circuitry. If the output is shorted indefinitely, the power dissipation could easily overheat the die or the current could eventually compromise metal integrity. Maximum reliability is maintained if the output current never exceeds ±40mA. This limit is set by the design of the internal metal interconnect. Note that for transient short circuits, the part is robust. Short circuit protection can be provided externally with a back match resistor in series with the output placed close as possible to the output pin. In video applications this would be a 75 Ω resistor and will provide adequate short circuit protection to the device. Care should still be taken not to stress the device with a short at the output. FIGURE 21. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE FIGURE 22. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE Typical Performance Curves (Continued) JEDEC JESD51-3 AND SEMI G42-88 (SINGLE LAYER) TEST BOARD 0.8 0.7 0.5 0.3 0.2 0.1 0 0 255075 100 150 AMBIENT TEMPERATURE (°C) 125 85 0.6 0.4 θ JA = 19 4°C /W µT Q FN 10 515mW JEDEC JESD51-7 HIGH EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD - QFN EXPOSED DIEPAD SOLDERED TO PCB PER JESD51-5 3 2.5 2 1.5 1 0.5 0 0 255075 100 150 AMBIENT TEMPERATURE (°C) 775mW θ JA=129 °C/W µTQ FN10 125 85 ISL59118 |
Аналогичный номер детали - ISL59118IRUZ-T7 |
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Аналогичное описание - ISL59118IRUZ-T7 |
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