? faraday technology. as part of continual product improvem ent the specifications, details and dimensions shown in this publication are subject to change without notice fara053d page 1 of 2 aug - 05 (d) these filters are designed to be used with half - band interpolating/decimating digital filters, for example the trw tmc2242, or with devices employing an output d/a which incorporates digital filters such as the trw digital video encoder tmc22190. th e digital filters have good attenuation between the frequencies of fs/4 and 3fs/4 where fs is the pxck (master clock) rate and, combined with double speed oversampling, this simplifies the specification for the analogue reconstruction and antialiasing pre filters as when the normal pxck rate of 27 mhz is used there is little signal energy between 6.75 mhz and 20.25 mhz. to reconstruct the analogue signal an additional filter is required to attenuate the clock frequency and its sidebands. to preserve the i ntegrity of the signal the analogue filter must have a passband similar to the requirement of ccir rec 601 but it does not need significant attenuation below 21 mhz. an additional feature in the faraday filters is a zero at 27 mhz to maximise suppression at the pxck rate. sinx/x correction may be added by grounding one pin in the device. fl476 / FL477 low cost multimedia reconst ruction filters
package detail faraday technology ltd. tel: + 44 (0)1782 661501 croft road industrial estate, fax: + 44 (0)1782 630101 newcastle, staffordsh ire email: sales@faradaytech.co.uk st5 0qz. england. web site: http://www.faradaytech.co.uk fara053d page 2 of 2 aug - 05 (d) fl476 FL477 through hole connections surface mount filter shape lowpass lowpass sinx/x correction pin selectable pin selectable sampling frequency 27 mhz 27 mhz en d of passband 5.75 mhz 5.75 mhz passband amplitude ripple to 5.5 mhz to 5.75 mhz < 0.05 db < 0.1 db < 0.05 db < 0.1 db start of stopband 21.5 mhz 21.5 mhz stopband attenuation wrt 100 khz > 40 db > 40 db group delay ripple < 6 ns < 6 ns group delay b andwidth 5.75 mhz 5.75 mhz delay time at 200 khz flat mode 58 ns nominal 58 ns nominal sinx/x mode 55 ns nominal 55 ns nominal impedance 75 ohms 75 ohms temperature range 0c to 70c 0c to 70c aqueous washable yes yes smd reflow limitatio ns as data sheet: n/a fara309 package dr00030a dr00055a
package detail faraday technology ltd. tel: + 44 (0)1782 661501 croft road industrial estate, fax: + 44 (0)1782 630101 newcastle, staffordsh ire email: sales@faradaytech.co.uk st5 0qz. england. web site: http://www.faradaytech.co.uk fara053d page 2 of 2 aug - 05 (d)
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