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The ADA4431-1 video filter and buffer with automatic load detect is the industry's lowest power filter for portable DVD and gaming platforms, cell phones, digital still cameras and other mobile multimedia devices that drive DC-coupled standard-definition (SD) video signals to the TV. The load-detect feature lowers total system quiescent current consumption when no video signal is present by more than 30X compared to the industry's nearest competing device. In addition, the new video filter incorporates a charge pump in place of traditional AC-output coupling, which eliminates the capacitor to enable smaller real estate, lower cost, and more efficient design. The ADA4431-1 is available in the industry's thinnest lead-frame chip-scale package (LFCSP), which at 0.55 mm is 35 percent thinner than traditional LFCSP packages. The analog processing portion of the IC offers excellent video performance, with 1-dB flatness out to 5.5 MHz, rejection of 28 dB at 27 MHz and differential gain and phase of 0.55% and 0.31 degrees, respectively.
Load detect feature reduces system power consumption
The ADA4431-1 video driver includes an on-chip load detect, which allows mobile multimedia devices to reduce power consumption by turning off the video processing portion of the device when no video load is present. Additionally, for applications with a single audio and video jack, the load-detect function can sense a non-video load.
New filter eliminates AC coupling capacitors from video signal chains
The ADA4431-1 uses an efficient charge pump to generate a negative power supply, allowing the full video signal to be properly processed and buffered without adding an AC coupling capacitor or extra voltage source. This function not only saves valuable board space and cost but assures the designer that the video signal will be properly driven at the output with the video signal back porch set at ground to guarantee true video black level.
The video filter and buffer is compatible with other Analog Devices' components, including the ADV739X low power video encoder family.
Availability and Pricing
The ADA4431-1 video filter and buffer with load detect is sampling now and will be available in full production quantities in July 2007. The device is priced at $0.45 in 1,000-piece quantities. The ADA4431-1 is available in a 16-lead thin LFCSP measuring 3 mm x 3 mm x 0.55 mm.
Posted May 24th, 2007 by rasick
