Help with Passive Filters specifications:
General Characteristics
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| Filter Type | |||
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| All Pass | All pass filters (phase shift filters) do not affect the amplitude of the signal. Instead, they change the phase of the signal without changing its amplitude. | ||
| Band Pass | Bandpass filters are used to attenuate frequencies above and below a range of frequencies called the bandwidth or passband of the filter. Any signal with a frequency within the bandpass range passes through the filter. Any signal with a frequency outside the bandpass is reduced. | ||
| Band Reject | Band reject filters (band stop filters, notch filters) are used to attenuate a range of frequencies and allow all other frequencies to pass. | ||
| High Pass | High pass filters attenuate frequencies above a particular frequency called the cut-off frequency. Frequencies higher than the cut-off frequency pass easily through the filter. | ||
| Low Pass | Low pass filters attenuate frequencies below a particular frequency called the cut-off frequency. Frequencies below the cut-off frequency pass easily through the filter | ||
| Universal / Programmable | Universal filters can be configured by the user to function as a low pass, high pass, band pass, or band stop filter. | ||
| Other | Other unlisted filter types. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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| Filter Order | |||
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| 1st Order | |||
| 2nd Order | |||
| 3rd order | |||
| 4th Order | |||
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| 6th Order | |||
| 7th Order | |||
| 8th Order | |||
| Other | Other unlisted orders. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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| Filter Characteristic | |||
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| Bessel | Bessel filters are active filters with a passband that maximizes the group delay at zero frequency, thus showing a constant group delay in the passband. Group delay is a measurement of the time it takes for a signal to move between two points in a network. A constant group delay in the passband of filters implies that for all signals with frequencies in the passband, the time delay will be the same. This fact is important in many applications, especially audio, video and radar applications. | ||
| Butterworth | Butterworth filters are designed so that the frequency response is flat in the passband. | ||
| Chebyshev | Chebyshev filters feature a very steep roll-off, but have ripples in the passband. | ||
| Elliptic | Elliptic filters (Cauer filters) exhibit equalized ripple in both the passband and the stopband. | ||
| Gaussian | Gaussian filters produce no overshoot in response to an input step. They optimize the rise and fall times. | ||
| Legendre | Legendre filters are designed to produce the maximum roll-off rate for a given order and a flat frequency response in the passband. | ||
| Other | Other unlisted filter characteristics. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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| Applications | The industrial field in which the device will be used. | ||
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| General | Filters are suitable for general-purpose applications. | ||
| Audio/Video | Filters are designed for audio or video applications. | ||
| Automotive | Filters are designed for automotive applications. | ||
| Avionics | Filters are designed for avionics applications. | ||
| Commercial | Filters are designed for commercial applications. | ||
| Communications | Filters are designed for communications applications. | ||
| Computers | Filters are designed for computers. | ||
| Data Acquisition | Filters are designed for data acquisition applications. | ||
| EMI Filtering | Filters are designed for electromagnetic immunity (EMI) or electromagnetic compliance (EMC) filtering systems. | ||
| Industrial | Filters are designed for industrial applications. | ||
| Medical | Filters are designed for medical equipment and medical applications. | ||
| Military | Filters are designed for military applications. | ||
| Portable Devices | Filters are designed for portable devices such as portable digital assistants (PDA), digital cameras, and cell phones. | ||
| Ripple Attenuator | Filters are designed to trim or filter the ripple voltage produced at the output of AC-DC or DC-DC converters. | ||
| Other | Other unlisted applications. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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Filter Performance
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| Operating Temperature | Operating temperature is the value specified by a level (minTypMax) of the ambient temperature (in °C) in which this item was designed to operate. | ||
| Search Logic: | User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria. | ||
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| Cutoff or Center Frequency (Fc) | The filter type determines the specified frequency (Fc). For band pass and band reject filters, the specified frequency is the center frequency. For low pass filters, the specified frequency is the cut-off frequency. For high pass filters, the specified frequency is the cut-on frequency. | ||
| Search Logic: | User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria. | ||
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| Bandwidth | Bandwidth is the range of frequencies that filters pass with minimal attenuation or, in the case of band reject filters, maximum attenuation. | ||
| Search Logic: | User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria. | ||
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Standards and Certifications
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| RoHS Compliant | Restriction of Hazardous Substances (RoHS) is a European Union (EU) directive that requires all manufacturers of electronic and electrical equipment sold in Europe to demonstrate that their products contain only minimal levels of the following hazardous substances: lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyl and polybrominated diphenyl ether. RoHS will become effective on July 1, 2006. | ||
| ELV Directive | End of Life Vehicles (ELV) Directive required that certain automotive products be free (except for trace impurities) of mercury, cadmium and lead by July 1, 2003. Lead can still be used as an alloying additive in copper, steel and aluminum; and in solderable applications. | ||
| Other | Other unlisted, specialized, or proprietary standard or certifications. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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