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MAX7438 Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX7438 Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 10 page Detailed Description Filter Filter Response The MAX7438/MAX7439 reconstruction filters consist of three separate lowpass filters with Butterworth-type response. The filter features a maximally flat passband for NTSC and PAL bandwidths, while maintaining good group delay characteristics. The stopband offers excel- lent attenuation at frequencies of 27MHz and above (see the Typical Operating Characteristics section). The autotrimming circuit digitally controls the corner fre- quency to maintain the frequency characteristics over process and temperature. High-Frequency Boost The high-frequency boost compensates for signal degradation and roll-off in the signal path prior to the MAX7438/MAX7439 to increase image sharpness. Program the level of high-frequency boost for each channel by selecting the corresponding external resis- tor values (RHFB_-1 and RHFB_-2, as shown in the Typical Operating Circuit section) given in Table 1. The Triple-Channel Video Reconstruction Filters with Back-Porch Clamp to GND 6 _______________________________________________________________________________________ Pin Description PIN NAME FUNCTION 1, 4, 7, 10, 11, 13, 15, 19 GND Ground 2 IN1 Channel 1 Video Input 3 HFB1 Channel 1 High-Frequency Boost and Filter Bypass Control Input. Connect external resistors to HFB1 for high-frequency boost and filter bypass control. See Table 1. 5 OUT1 Channel 1 Video Output 6VCC +5V Power Input 8 OUT2 Channel 2 Video Output 9VSS -5V Power Input. Connect the backside exposed pad to VSS. 12 OUT3 Channel 3 Video Output 14 HFB3 Channel 3 High-Frequency Boost and Filter Bypass Control Input. Connect external resistors to HFB3 for high-frequency boost and filter bypass control. See Table 1. 16 IN3 Channel 3 Video Input 17 HFB2 Channel 2 High-Frequency Boost and Filter Bypass Control Input. Connect external resistors to HFB2 for high-frequency boost and filter bypass control. See Table 1. 18 IN2 Channel 2 Video Input 20 EXT External Bias Resistor. Connect a 10k Ω resistor from EXT to GND. — EP Exposed Paddle. Connect to VSS. Do not connect to GND. MODE RHFB_-1 (k Ω) RHFB_-2 (k Ω) VHFB_ (V) (VCC = 5V) NOMINAL BOOST (dB)/ BYPASS (MAX7438) NOMINAL BOOST (dB)/ BYPASS (MAX7439) Bypass Open 0 0 Bypass Bypass No boost 15 1 0.318 0 0 Boost 1 11.3 2 0.758 0.5 0.75 Boost 2 16.5 7.32 1.53 1.0 1.5 Boost 3 11.3 11.3 2.5 1.5 2.25 Boost 4 4.42 18.2 4.027 2.0 3.0 Table 1. External Resistor Values for Bypass Mode and High-Frequency Boost Control |
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