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Four-channel video reconstruction filters

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MAXIM Integrated Products, represented by Arrow Electronics , has introduced the MAX7445-MAX7449 family of low-cost, buffered, 4-channel video reconstruction filters.

These devices are suitable for anti-aliasing and DAC-smoothing video applications, or whenever analogue video is reconstructed from a digital data stream, such as cable/satellite/terrestrial set-top boxes, DVD players, hard-disk recorders (HDR), and personal video recorders (PVRs).

The MAX7445--MAX7449 use a continuous-time, Butterworth-type response lowpass filter to attenuate the sampling frequency of the DAC encoder.

Internal video signal-timing extraction and clamping allow excellent video performance while saving design time. Each buffered output is capable of driving two standard video loads.

The MAX7445-MAX7449 operate from a single +5V supply and have a flat passband out to 5MHz, ideal for NTSC, PAL, and standard-definition (SDTV) video signals with a stopband of 41dB at 27MHz.

An external pin adjusts the gain of the video buffer to either +6dB, +9.5dB, or +12dB to accommodate video encoder DAC output signals of <1V. An external pin can disable output control.

The MAX7446 processes CVBS, R, G, and B video signals, making it suiatble for European SCART set-top boxes. The MAX7447 processes CVBS, Y, C, and a second asynchronous CVBS video signal.

The MAX7448 processes R, G, B, and CVBS (asynchronous) video signals, while the MAX7449 is a 3-channel device for R, G, and B video signals and an external sync video system. The MAX7445 supports all of the above 4-channel applications.

The MAX7445-MAX7449 are low-cost, high-performance replacements for standard discrete filter and buffer solutions.

These devices are available in a 14-pin TSSOP package in the extended (-40ºC to +85ºC) temperature range.

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