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AD713JCHIPS bảng dữ liệu(PDF) 11 Page - Analog Devices |
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AD713JCHIPS bảng dữ liệu(HTML) 11 Page - Analog Devices |
11 / 14 page REV. C AD713 –11– FILTER APPLICATIONS A Programmable State Variable Filter For the state variable or universal filter configuration of Figure 18 to function properly, DACs A1 and B1 need to control the gain and Q of the filter characteristic, while DACs A2 and B2 must accurately track for the simple expression of fC to be true. This is readily accomplished using two AD7528 DACs and one AD713 quad op amp. Capacitor C3 compensates for the effects of op amp gain-bandwidth limitations. This filter provides low pass, high pass and band pass outputs and is ideally suited for applications where microprocessor control of filter parameters is required. The programmable range for component values shown is fC = 0 to 15 kHz and Q = 0.3 to 4.5. GIC and FDNR FILTER APPLICATIONS The closely matched and uniform ac characteristics of the AD713 make it ideal for use in GIC (gyrator) and FDNR (fre- quency dependent negative resistor) filter applications. Figures Figure 18. A Programmable State Variable Filter Circuit 19 and 21 show the AD713 used in two typical active filters. The first shows a single AD713 simulating two coupled inductors configured as a one-third octave bandpass filter. A single section of this filter meets ANSI class II specifications and handles a 7.07 V rms signal with <0.002% THD (20 Hz–20 kHz). Figure 21 shows a 7-pole antialiasing filter for a 2 oversam- pling (88.2 kHz) digital audio application. This filter has <0.05 dB pass band ripple and 19.8 ±0.3 µs delay, dc-20 kHz and will handle a 5 V rms signal (VS = ±15 V) with no overload at any internal nodes. The filter of Figure 19 can be scaled for any center frequency by using the formula: f C = 1.11 2 πRC where all resistors and capacitors scale equally. Resistors R3–R8 should not be greater than 2 k Ω in value, to prevent parasitic oscillations caused by the amplifier’s input capacitance. Figure 19. A 1/3 Octave Filter Circuit |
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