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OPA362 Datasheet(PDF) 9 Page - Texas Instruments |
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OPA362 Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 18 page  12.5pF 1kW 4.22kW 1838W 2.5kW V O OPA362 ( ) 3.6pF 872W 75W 75W Television OPA362 www.ti.com ........................................................................................................................................................................................ SBOS480 – SEPTEMBER 2009 Operating Voltage Enable pin enables the op amp. The logic levels are compatible with 1.8V CMOS logic levels. A valid logic The OPA362 is fully specified from 2.5V to 3.3V over high is defined as greater than 1.3V above GND. A a temperature range of –40°C to +125°C. Parameters valid logic low is defined as less than 0.5V above that vary significantly with operating voltages or GND. If the Enable pin is not connected, internal temperature are shown in the Typical Characteristics. pull-up circuitry enables the amplifier. Power-supply pins should be bypassed with 100nF ceramic capacitors. When disabling the OPA362, internal circuitry also disconnects the internal gain setting feedback. This feature supports the TV-detection function; see the Input Voltage TV-Detect Function section for more detailed The input common-mode range of the OPA362 series information. extends from GND to 0.55V on a 3.3V supply. The input range is limited by the internal gain in Internal Two-Pole Filter conjunction with the maximum output swing capability and the power-supply voltage. The OPA362 filter is a Sallen-Key topology with an 8.5MHz cutoff frequency. Figure 19 shows a detailed drawing of the filter components. This filter allows Input Overvoltage Protection video signals to pass without any visible distortion, as All OPA362 pins are static-protected with internal shown in Figure 20 through Figure 23. The video ESD protection diodes connected to the supplies. encoder embedded in the OMAP343x processor These diodes provide input overdrive protection if the typically samples at 54MHz. At this frequency, the current is externally limited to 10mA. attenuation is typically 23dB, which effectively attenuates the sampling aliases. Enable/Shutdown The internal 872 Ω resistor on the input to GND The OPA362 has a shutdown feature that disables converts the output current of the OMAP3430 internal the output and reduces the quiescent current to less video DAC into a voltage. It is also part of the than 1.5 μA. This feature is especially useful for Sallen-Key filter. Using an external resistor to adjust portable video applications, where the device is the input voltage range also changes the filter infrequently connected to a television (TV) or other characteristics. video device. The Enable logic input voltage is referenced to the OPA362 GND pin. A logic level high applied to the Figure 19. OPA362 Filter Structure Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Link(s): OPA362 |
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