Product category:
Analogue and Mixed Signal ICs
News Release from: Analog Devices | Subject: ADA4431-1
Edited by the Electronicstalk Editorial
Team on 29 May 2007
Video filter saves power with load
detection
Compact video filter drives composite video from portable multimedia devices to a TV and is the first to integrate a charge pump and load detect feature.
The latest device from Analog Devices is billed as the industry's most compact video filter for driving composite video from portable multimedia devices to a TV and is the first to integrate a charge pump and load detect feature The ADA4431-1 video filter and buffer with automatic load detect is the industry's lowest power filter for portable DVD and gaming platforms, cellphones, digital still cameras and other mobile multimedia devices that drive DC-coupled standard-definition (SD) video signals to the TV
This article was originally published on Electronicstalk on 2 Jul 2008 at 8.00am (UK)
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The load-detect feature lowers total system quiescent current consumption when no video signal is present by more than 30x compared with 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 0.55mm is 35% thinner than traditional LFCSP packages.
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The analogue processing portion of the IC offers excellent video performance, with 1dB flatness out to 5.5MHz, rejection of 28dB at 27MHz and differential gain and phase of 0.55% and 0.31 degrees, respectively.
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 nonvideo load.
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.
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 US $0.45 in 1000-piece quantities.
The ADA4431-1 is available in a 16-lead thin LFCSP measuring 3 x 3 x 0.55mm.
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