RFR1772F FARADAY | Alldatasheet
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© Faraday Technology. As part of continual product improvement the specifications, details and dimensions shown in this publication are subject to change without notice FARA158d Page 1 of 2 Dec-99 (A) These filters are designed especially for use in systems where composite video signals are digitised. A sampling frequency of four times the colour subcarrier frequency is normally used as with D2 systems. The filters have a bandwidth of 5.5 MHz for 625 line systems, a stopband attenuation of 50 dB after 11.75 MHz and a zero at the sampling rate of 17.72 MHz. The attenuation at the sampling frequency is approximately 80 dB so minimising aliasing effects. The relatively slow roll-off and controlled group delay over the whole of the passband minimises time domain ringing ensuring the system has an excellent performance. Flat (pre filter) and sinx/x (post filter) versions are available. The module is 40 pin DIL suitable for direct mounting in a pcb. Ground pins should be taken to separate earth points to maintain transmission line characteristics if the full stopband performance is required. Type Number RFR1772F RFR1772S Filter Shape Lowpass Lowpass Passband Shape Flat Sinx/x Sampling Frequency 17.72 MHz 17.72 MHz Attenuation at S.F. wrt 100 kHz > 70 dB > 70 dB Insertion Loss at 100 kHz < 0.8 dB < 2.5 dB End Of Passband 5.5 MHz 5.5 MHz Passband Ripple wrt 100 kHz + 0.10 dB + 0.15 dB Loss at half S.F. wrt 100 kHz 18.0 dB 16.5 dB Start Of Stopband 11.75 MHz 11.75 MHz Stopband Attenuation > 50 dB > 50 dB Group Delay Ripple wrt 200 kHz + 5.0 ns + 5.0 ns Group Delay Bandwidth 5.5 MHz 5.0 MHz Delay Time at 200 kHz 250 ns nom 240 ns nom Pulse And Bar K - Rating < 0.5 % < 0.5 % Luminance / Chrominance Gain < 2 % n/a Luminance / Chrominance Delay < 5 ns < 5 ns Impedance 75 ohms 75 ohms Temperature Range 0°C to 70°C 0°C to 70°C Aqueous washable Yes Yes RFR SERIES ANTIALIASING FILTERS
Faraday Technology Ltd. Tel: + 44 (0 )1782 661501 Croft Road Industrial Estate, Fax: + 44 (0)1782 630101 Newcastle, Staffordshire Email: sales@faradaytech.co.uk FARA158d Page 2 of 2 Dec-99 (A)