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| OA SERIES VIDEO OVERSAMPLING SMD FILTERS * Surface mount compatibility * Flat or Sinx/x versions * Small size, low cost * Luminance and Chrominance versions With reduced analogue filter costs resulting from oversampling techniques, there is an increased need for manufacturing facilities to avoid the large production costs associated with the presently available through hole packages. The Faraday OA range of oversampling filters can be used in surface mount assembly lines allowing vacuum pick up and reflow. 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 a good amplitude and group delay characteristics in the passband, similar to the requirements of CCIR601 but due to the above considerations do not have significant attenuation below 21 MHz. Order code: Impedance Sinx/x correction Sampling Freq. End of Passband Amp. ripple G.D. ripple Start of stopband Stopband atten. wrt 100 kHz Delay time nom. at 200 kHz Package OAYSA 75 Yes 27.0 MHz 5.75 MHz < 0.25 dB < 10 ns 21.5 MHz > 40 dB 27 ns DR00171A OAYFA 75 No 27.0 MHz 5.75 MHz < 0.12 dB < 6 ns 21.5 MHz > 40 dB 30 ns DR00171A OACSA 75 Yes 13.5 MHz 2.75 MHz < 0.30 dB < 20 ns 10.75 MHz > 40 dB 50 ns DR00171A OACFA 75 No 13.5 MHz 2.75 MHz < 0.12 dB < 12 ns 10.75 MHz > 40 dB 58 ns DR00171A (c) Faraday Technology. As part of continual product improvement the specifications, details and dimensions shown in this publication are subject to change without notice FARA068.DOC Page 1 of 2 Jun-99(A) PACKAGE DETAIL Faraday Technology Ltd. Croft Road Industrial Estate, Newcastle, Staffordshire ST5 0QZ. England. FARA068.DOC 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 Jun-99(A) |
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