標準画質ビデオ再生フィルタ及びバッファ
SUNNYVALE, CA-November 29, 2001-Maxim Integrated Products introduces the MAX7430/MAX7432 standard definition video reconstruction filters and buffers. Each channel of the MAX7430/MAX7432 combines a 6th-order continuous time lowpass filter with adjustable boost levels, a 2:1 input multiplexer, a filter bypass switch, and an output buffer capable of driving two standard 150 video loads. The preprogrammed filter characteristic supports NTSC, PAL, and standard-definition (SDTV) video signals, making the MAX7430/MAX7432 ideal for anti-aliasing and DAC smoothing in digital video devices such as cable set-top boxes, satellite set-top boxes, DVD players, camcorders, and personal video recorders (PVRs).
The two-channel MAX7430 supports Y/C (S-Video) or two composite video signals (CVBS). The three-channel MAX7432 is ideal for RGB (Y Pr Pb) video signals, but also supports three composite video signals or Y/C plus composite video signals. For a composite video signal application only, see the previously introduced single-channel MAX7428. Each filter channel achieves 50dB of attenuation at 27MHz with less than ±0.25dB of passband ripple from DC to 5.5MHz. High-frequency boost circuitry provides picture-sharpness adjustment with up to 1.5dB of gain boost in 0.5dB increments without degradation in the stopband attenuation.
A serial interface controls the 2:1 input multiplexer, output disable, adjustable boost levels, and filter bypass switch. Unique bus addresses set by a capacitor connected to REXT allow up to 16 MAX7428/MAX7430/MAX7432s to share the same serial bus and be independently configured.
The MAX7428/MAX7430/MAX7432 save significant board space and design time while providing increased performance at a cost comparable to the standard discrete L-R-C filter and buffer solutions used today. The MAX7428/MAX7430/MAX7432 are offered in 8-pin SOT23, 10-pin µMAX, and 14-pin TSSOP packages, respectively. They operate in the extended (-40°C to +85°C) temperature range, with prices starting at $0.90 (1000-up, FOB USA) for the MAX7428, $1.42 (1000-up, FOB USA) for the MAX7430, and $1.82 (1000-up, FOB USA) for the MAX7432.
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