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MAX7490 Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX7490 Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 18 page Dual Universal Switched-Capacitor Filters ______________________________________________________________________________________ 11 Mode 1 Figure 2 shows the MAX7490/MAX7491s’ configuration of Mode 1. This mode provides 2nd-order notch, low- pass, and bandpass filter functions. The gain at all three outputs is inversely proportional to the value of R1. The center frequency, fO, is fixed at fCLK/100. High- Q bandpass filters can be built without exceeding the bandpass amplifier’s output swing (i.e., HOBP does not have to track Q). The notch and bandpass center fre- quencies are identical. The notch output gain is the same above and below the notch center frequency. Mode 1 can also be used to make high-order Butter- worth lowpass filters, low Q notches, and multiple-order bandpass filters obtained by cascading identical switched-capacitor sections. Mode 1 Design Equations Mode 1B Figure 3 shows the configuration of Mode 1B. R5 and R6 are added to lower the feedback voltage from the lowpass output to the summing input. This allows the clock-to-center frequency to be adjusted beyond the nominal value. This mode essentially has the same functions and speed as Mode 1 while providing a high- Q with fCLK/fO ratios greater than the nominal value. Mode 1B Design Equations Mode 2 Figure 4 shows the configuration of Mode 2. Mode 2 is a combination of Mode 1 and Mode 3. In this mode, fCLK/fO is always less than the part’s nominal ratio. However, it provides less sensitivity to resistor toler- ances than does Mode 3. It has a highpass notch out- put where the notch frequency depends solely on the clock frequency. f f R RR ff Q R R R RR H R R RR R H R R Has f Hz R R Hat f f R R O CLK nO OLP OBP ON ON CLK = + = = + = + = →= == − − − − 100 6 65 3 2 6 65 2 1 65 6 3 1 0 2 1 2 2 1 1 2 () (/ ) f f ff Q R R H R R H R R Has f Hz R R Hat f f R R O CLK notch O OLP OBP ON ON CLK = = = = = →= == − − − − 100 3 2 2 1 3 1 0 2 1 2 2 1 1 2 () (/ ) Σ ∫ ∫ LP BP S N R3 R2 R1 VIN CC COM + - Figure 2. Mode 1, 2nd-Order Filter Providing Notch, Bandpass, and Lowpass Outputs Σ ∫ ∫ LP BP S N R3 R6 R5 R2 R1 VIN CC COM COM + - Figure 3. Mode 1B, 2nd-Order Filter Providing Notch, Bandpass, and Lowpass Outputs |
Similar Part No. - MAX7490_09 |
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Similar Description - MAX7490_09 |
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