These anti-aliasing filters are designed especially for use in systems where composite video signals are digitised. A sampling frequency of four times the colour sub-carrier 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.