UAF42 datasheet, UAF42 pdf. Free from the switching noise and aliasing problems of. The program guides you through the filter design and gen.

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Although active filters are vital in modern electronics, their design and verification can be tedious and time consuming. To aid in the design of active filters, Burr-Brown provides a series of FilterProTM computer-aided design programs. Us- ing the FILTER42 program and the UAF42 it is easy to design and implement all kinds of active filters. The UAF42 is a monolithic IC which contains the op amps, matched resistors, and precision capacitors needed for a state-variable filter pole-pair. A fourth, uncommitted precision op amp is also included on the die. Eliminates signals above the cutoff frequency (in the stop- band), and perfectly passes signals below it (in the pass- band).

In real filters, various trade-offs are made in an attempt to approximate the ideal. Some filter types are optimized for gain flatness in the pass-band, some trade-off gain variation or ripple in the pass-band for a steeper rate of attenuation between the pass-band and stop-band (in the transition-band), still others trade-off both flatness and rate of roll-off in favor of pulse-response fidelity.

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FILTER42 supports the three most commonly used all-pole filter types: Butterworth, Chebyshev, and Bessel. The less familiar In- verse Chebyshev is also supported. If a two-pole band-pass or notch filter is selected, the program defaults to a resonant- circuit response. This advantage comes at the penalty of amplitude variation (ripple) in the pass-band.

Unlike Butterworth and Bessel responses, which have 3dB attenuation at the cutoff fre- quency, Chebyshev cutoff frequency is defined as the fre- quency at which the response falls below the ripple band. For even-order filters, all ripple is above the dc-normalized passband gain response, so cutoff is at 0dB (see Figure 2A). For odd-order filters, all ripple is below the dc-normalized passband gain response, so cutoff is at ­(ripple) dB (see Figure 2B).

For a given number of poles, a steeper cutoff can be achieved by allowing more pass-band ripple. The Chebyshev has more ringing in its pulse response than the Butterworth-especially for high-ripple designs. Bessel (maximally flat time delay), also called Thomson. Due to its linear phase response, this filter has excellent pulse response (minimal overshoot and ringing). For a given number of poles, its magnitude response is not as flat, nor is its initial rate of attenuation beyond the ­3dB cutoff fre- quency as steep as the Butterworth.

It takes a higher-order Bessel filter to give a magnitude response similar to a given Butterworth filter, but the pulse response fidelity of the Bessel filter may make the added complexity worthwhile. The simplest filter circuit consists of a single pole-pair subcircuit as shown in Figure 5. More complex filters consist of two or more cascaded subcircuits as shown in Figure 6. Even-order filters are implemented entirely with UAF42 pole-pair sections and normally require no external capacitors. Odd-order filters additionally require one real pole section which can be implemented with the fourth uncommitted op amp in the UAF42, an external resistor, and an external capacitor. The program can be used to design filters up to tenth order. Filter designs consist of cascaded complex pole-pair and real-pole subcircuits.

Complex pole pair subcircuits are based on the UAF42 state-variable filter topology. Six varia- tions of this circuit can be used, PP1 through PP6. Real pole sections can be implemented with the auxiliary op amp in the UAF42. High-pass (HP) and low-pass (LP) real-pole sections can be used.

Serial port communication program. The subcircuits are referenced with a two or three letter abbreviation on the UAF42 Filter Compo- nent Values and Filter Block Diagram program outputs. Descriptions of each subcircuit follow.

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Although active filters are vital in modern electronics, their design and verification can be tedious and time consuming. To aid in the design of active filters, Burr-Brown provides a series of FilterProTM computer-aided design programs. Us- ing the FILTER42 program and the UAF42 it is easy to design and implement all kinds of active filters. The UAF42 is a monolithic IC which contains the op amps, matched resistors, and precision capacitors needed for a state-variable filter pole-pair.

A fourth, uncommitted precision op amp is also included on the die. Eliminates signals above the cutoff frequency (in the stop- band), and perfectly passes signals below it (in the pass- band). In real filters, various trade-offs are made in an attempt to approximate the ideal. Some filter types are optimized for gain flatness in the pass-band, some trade-off gain variation or ripple in the pass-band for a steeper rate of attenuation between the pass-band and stop-band (in the transition-band), still others trade-off both flatness and rate of roll-off in favor of pulse-response fidelity.

FILTER42 supports the three most commonly used all-pole filter types: Butterworth, Chebyshev, and Bessel. The less familiar In- verse Chebyshev is also supported.

If a two-pole band-pass or notch filter is selected, the program defaults to a resonant- circuit response. This advantage comes at the penalty of amplitude variation (ripple) in the pass-band. Unlike Butterworth and Bessel responses, which have 3dB attenuation at the cutoff fre- quency, Chebyshev cutoff frequency is defined as the fre- quency at which the response falls below the ripple band. For even-order filters, all ripple is above the dc-normalized passband gain response, so cutoff is at 0dB (see Figure 2A).

For odd-order filters, all ripple is below the dc-normalized passband gain response, so cutoff is at ­(ripple) dB (see Figure 2B). For a given number of poles, a steeper cutoff can be achieved by allowing more pass-band ripple. The Chebyshev has more ringing in its pulse response than the Butterworth-especially for high-ripple designs. Bessel (maximally flat time delay), also called Thomson. Due to its linear phase response, this filter has excellent pulse response (minimal overshoot and ringing). For a given number of poles, its magnitude response is not as flat, nor is its initial rate of attenuation beyond the ­3dB cutoff fre- quency as steep as the Butterworth. It takes a higher-order Bessel filter to give a magnitude response similar to a given Butterworth filter, but the pulse response fidelity of the Bessel filter may make the added complexity worthwhile.

The simplest filter circuit consists of a single pole-pair subcircuit as shown in Figure 5. More complex filters consist of two or more cascaded subcircuits as shown in Figure 6. Even-order filters are implemented entirely with UAF42 pole-pair sections and normally require no external capacitors.

Odd-order filters additionally require one real pole section which can be implemented with the fourth uncommitted op amp in the UAF42, an external resistor, and an external capacitor. The program can be used to design filters up to tenth order. Filter designs consist of cascaded complex pole-pair and real-pole subcircuits.

Complex pole pair subcircuits are based on the UAF42 state-variable filter topology. Six varia- tions of this circuit can be used, PP1 through PP6. Real pole sections can be implemented with the auxiliary op amp in the UAF42.

High-pass (HP) and low-pass (LP) real-pole sections can be used. The subcircuits are referenced with a two or three letter abbreviation on the UAF42 Filter Compo- nent Values and Filter Block Diagram program outputs. Descriptions of each subcircuit follow.