VIDEO OVERSAMPLING SMD
RA SERIES
· Reflowable
· Washable
· 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 RA range of oversampling filters can be used in
surface mount assembly lines allowing vacuum pick up and reflow (see Page 2).
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:
RAYSA
RAYFA
RACSA
RACFA
Impedance
75W
75W
75W
75W
Sinx/x correction
Sampling Freq.
End of Passband
Amp. ripple
Yes
No
Yes
No
27.0 MHz
5.75 MHz
< 0.25 dB
< 10 ns
27.0 MHz
5.75 MHz
< 0.12 dB
< 6 ns
13.5 MHz
2.75 MHz
< 0.30 dB
< 20 ns
13.5 MHz
2.75 MHz
< 0.12 dB
< 12 ns
10.75 MHz
> 40 dB
58 ns
G.D. ripple
Start of stopband
21.5 MHz
21.5 MHz
> 40 dB
30 ns
10.75 MHz
> 40 dB
50 ns
Stopband atten. wrt 100 kHz > 40 dB
Delay time nom. at 200 kHz 27 ns
Aqueous Washable
Package
Yes
Yes
Yes
Yes
DR00274A
DR00274A
DR00274A
DR00274A
© Faraday Technology. As part of continual product improvement the specifications, details and dimensions shown in this publication are subject to change without notice
Fara368d
Page 1 of 3
Sep-02(A)
FARADAY [ FARADAY TECHNOLOGY ]
