Video Oversampling Filters SIL RANGE Features • • Space saving SIL package Sinx/x Selectable or Flat versions • • Small size, low cost Luminance and Chrominance versions This range of analogue filters has been designed for use in conjunction with a half band interpolating/decimating filter such as the TRW2242 or with the many encoder chips available which employ digital filtering combined with an output D to A converter. This type of digital filtering has good attenuation between the frequencies of Fs/4 and 3Fs/4 where Fs is the Master Clock rate. When the normal clock rate of 27 MHz is used for the luminance channel the signal can be expected to have insignificant energy between 6.75 MHz and 20.25 MHz. An analogue filter is required to attenuate the clock and sideband to reconstruct the signal. In order to preserve the integrity of the signal these filters have a good amplitude and group delay characteristics in the passband, similar to the requirements of CCIR601 but due to the above considerations do not need significant attenuation below 21 MHz. Order code Impedance Sinx/x correction Sampling Frequency End of Passband Amp. Ripple G.D. ripple Start of stopband Stopband atten. 2 Delay time nom. 3 Aqueous Washable Package Flat Sinx/x1 Flat Sinx/x FL676 75 Ω No 27.0 MHz 5.75 MHz < 0.1 dB < 6 ns 21.5 MHz >40 dB 30 ns Yes DR00034A FL714 75 Ω Selectable 27.0 MHz 5.75 MHz < 0.1 dB < ± 0.2 dB < 6 ns < 10 ns 21.5 MHz > 40 dB 27 ns Yes DR00064B FL677 75 Ω No 13.5 MHz 2.75 MHz < 0.1 dB < 12 ns 10.75 MHz > 40 dB 58 ns Yes DR00034A FL715 75 Ω Selectable 13.5 MHz 2.75 MHz < 0.1 dB < ± 0.2 dB < 12 ns < 20 ns 10.75 MHz > 40 dB 50 ns Yes DR00064B 1 Sinx/x amplitude ripple measured wrt 100 kHz Stopband attenuation measured wrt 100 kHz 3 Nominal delay time measured at 200 kHz 2 Other package sizes and styles are available © Faraday Technology. As part of continual product improvement the specifications, details and dimensions shown in this publication are subject to change without notice Fara070d Page 1 of 2 Aug-05(C) PACKAGE DETAIL Faraday Technology Ltd. Croft Road Industrial Estate, Newcastle, Staffordshire ST5 0QZ. England. Fara070d Tel: Fax: Email: Web site: Page 2 of 2 + 44 (0)1782 661501 + 44 (0)1782 630101 [email protected] http://www.faradaytech.co.uk Aug-05(C)