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| OB SERIES VIDEO OVERSAMPLING SMD FILTERS * Surface Mount Package * Flat or Sinx/x 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 and 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. In order to preserve the integrity of the signal these filters have good amplitude and group delay characteristics in the passband that meet requirements of CCIR601, but due to the above considerations do not have significant attenuation below 21 MHz. Order code Filter Shape Impedance Sinx/x correction Sampling Freq. End of Passband Amp. ripple to 5.5 MHz to 5.75 MHz G.D. ripple Start of stopband Stopband atten. wrt 100 kHz Delay time nom. at 200 kHz Aqueous Washable SMD Reflow Limitations Package OBYSB Lowpass 75 Yes 27.0 MHz 5.75 MHz < 0.05 dB < 0.1 dB < 6 ns 21.5 MHz > 40 dB 55 ns Yes OBYFB Lowpass OBCSB Lowpass OBCFB Lowpass 75 No 13.5 MHz 2.75 MHz < 0.05 dB < 0.1 dB < 12 ns 10.75 MHz > 40 dB 116 ns Yes 75 75 No Yes 27.0 MHz 13.5 MHz 5.75 MHz 2.75 MHz < 0.05 dB < 0.05 dB < 0.1 dB < 0.1 dB < 6 ns < 12 ns 21.5 MHz 10.75 MHz > 40 dB > 40 dB 58 ns 110 ns Yes Yes refer to Data Sheet Fara309 DR00325A (c) Faraday Technology. As part of continual product improvement the specifications, details and dimensions shown in this publication are subject to change without notice FARA084d Page 1 of 2 Jul-03(E) PACKAGE DETAIL Faraday Technology Ltd. Croft Road Industrial Estate, Newcastle, Staffordshire ST5 0QZ. England. FARA084d Tel: Fax: Email: Web site: Page 2 of 2 + 44 (0)1782 661501 + 44 (0)1782 630101 sales@faradaytech.co.uk http://www.faradaytech.co.uk Jul-03(E) |
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