FL477

Multimedia Reconstruction Filters FL476 / FL477 Low Cost 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. The 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 integrity 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. © F araday Technology. As part of continual product improvement the specifications, details and dimensions shown in this publication are subject to change without notice F ARA053d Page 1 of 2 Aug-05(D) PACKAGE DETAIL FL476 Filter Shape Sinx/x correction Sampling Frequency End Of Passband Passband Amplitude Ripple Through hole connections Lowpass Pin selectable 27 MHz 5.75 MHz to 5.5 MHz to 5.75 MHz < 0.05 dB < 0.1 dB FL477 Surface mount Lowpass Pin selectable 27 MHz 5.75 MHz < 0.05 dB < 0.1 dB Faraday Technology Ltd. Croft Road Industrial Estate, Newcastle, Staffordshire ST5 0QZ. England. F ARA053d Start Of Stopband Stopband Attenuation wrt 100 kHz Group Delay Ripple Group Delay Bandwidth Delay Time at 200 kHz Flat mode Sinx/x mode Impedance Temperature Range Aqueous Washable SMD Reflow Limitations as Data Sheet: Package 21.5 MHz > 40 dB < 6 ns 5.75 MHz 58 ns nominal 55 ns nominal 75 ohms 0°C to 70°C Yes n/a DR00030A 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 Aug-05(D) 21.5 MHz > 40 dB < 6 ns 5.75 MHz 58 ns nominal 55 ns nominal 75 ohms 0°C to 70°C Yes Fara309 DR00055A PACKAGE DETAIL Faraday Technology Ltd. Croft Road Industrial Estate, Newcastle, Staffordshire ST5 0QZ. England. F ARA053d 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 Aug-05(D)