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MAX7443 データシート(PDF) 4 Page - Maxim Integrated Products |
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MAX7443 データシート(HTML) 4 Page - Maxim Integrated Products |
4 / 8 page Triple-Channel Video Reconstruction Filter and Buffer for Composite and Y/C Outputs 4 _______________________________________________________________________________________ 65 70 80 75 85 90 -40 10 -15 35 60 85 SUPPLY CURRENT vs. TEMPERATURE TEMPERATURE ( °C) DIFFERENTIAL GAIN 13 24 5 6 7 13 24 5 6 7 0.2 0.3 0.1 0 -0.1 -0.2 -0.3 0.2 0.3 0.1 0 -0.1 -0.2 -0.3 DIFFERENTIAL PHASE MULTIBURST RESPONSE YIN 200mV/div YOUT 200mV/div 10 µs/div Typical Operating Characteristics (continued) (VCC = +5V, TA = +25°C, unless otherwise noted.) Detailed Description The primary function of the MAX7443/MAX7444 is to fil- ter and buffer the encoder DAC outputs that contain digital video information in applications such as set-top boxes, hard-disk recorders, DVD players, and digital VCRs. These devices reconstruct and clean up analog video signals. Each MAX7443/MAX7444 consists of a lowpass filter and an adjustable-gain output video buffer that is capable of driving two standard 150 Ω video loads. The luma (YIN) and chroma (CIN) video inputs are summed internally to provide the composite (CVOUT) video output. These devices operate from a single +5V supply. The filters have a nominal cutoff frequency optimized for NTSC, PAL, and SDTV. Filter Filter Response The reconstruction filter consists of two 2nd-order Sallen-Key stages. The Butterworth-type response fea- tures a maximally flat passband for NTSC and PAL bandwidths. The stopband offers 41dB (typ) of attenua- tion at sampling frequencies of 27MHz and above (see Typical Operating Characteristics). High-Frequency Boost The high-frequency boost available in the MAX7444 compensates for signal degradation and rolloff in the video encoder, which increases the image sharpness. The MAX7443 has a flat response over the video band- width. Output Buffer The output buffer drives two 150 Ω video loads with a 2VP-P signal. The adjustable gain of the output buffer provides a gain of 6dB, 9.5dB, and 12dB, which are selected by tying the GSET pin to GND, VCC, or float- ing, respectively. The MAX7443/MAX7444 can drive an AC load or drive the video load directly without using the large output capacitor. The output buffer drives a DC load with an output blanking level of less than 1V. PIN NAME FUNCTION 1 YIN Luma (Y) Input 2 GSET Gain-Setting Control Input. See Table 1 for values. 3 CIN Chroma (C) Input 4 GND Ground 5VCC 5V Power Supply 6 COUT Chroma (C) Output 7 CVOUT Composite Video Output 8 YOUT Luma (Y) Output Pin Description |
同様の部品番号 - MAX7443 |
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同様の説明 - MAX7443 |
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