RFR SERIES
ANTIALIASING FILTERS
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
Filter Shape
Passband Shape
Sampling Frequency
Attenuation at S.F. wrt 100 kHz
Insertion Loss at 100 kHz
End Of Passband
Passband Ripple wrt 100 kHz
Loss at half S.F. wrt 100 kHz
Start Of Stopband
Stopband Attenuation
Group Delay Ripple wrt 200 kHz
Group Delay Bandwidth
Delay Time at 200 kHz
Pulse And Bar K - Rating
Luminance / Chrominance Gain
Luminance / Chrominance Delay
Impedance
Temperature Range
Aqueous washable
Package Type
RFR1772F
Lowpass
Flat
17.72 MHz
> 70 dB
< 0.8 dB
5.5 MHz
+ 0.10 dB
18.0 dB
11.75 MHz
> 50 dB
+ 5.0 ns
5.5 MHz
250 ns nom
< 0.5 %
<2%
< 5 ns
75 ohms
0°C to 70°C
Yes
DR00020B
RFR1772S
Lowpass
Sinx/x
17.72 MHz
> 70 dB
< 2.5 dB
5.5 MHz
+ 0.15 dB
16.5 dB
11.75 MHz
> 50 dB
+ 5.0 ns
5.0 MHz
240 ns nom
< 0.5 %
n/a
< 5 ns
75 ohms
0°C to 70°C
Yes
DR00020B
© 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)
FARADAY [ FARADAY TECHNOLOGY ]
