OA SERIES
VIDEO OVERSAMPLING SMD FILTERS
•
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 OA range of oversampling filters can be used in
surface mount assembly lines allowing vacuum pick up and reflow.
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:
Impedance
Sinx/x correction
Sampling Freq.
End of Passband
Amp. ripple
G.D. ripple
Start of stopband
Stopband atten.
wrt 100 kHz
Delay time nom.
at 200 kHz
Package
OAYSA
75Ω
Yes
27.0 MHz
5.75 MHz
< 0.25 dB
< 10 ns
21.5 MHz
> 40 dB
27 ns
DR00171A
OAYFA
75Ω
No
27.0 MHz
5.75 MHz
< 0.12 dB
< 6 ns
21.5 MHz
> 40 dB
30 ns
DR00171A
OACSA
75Ω
Yes
13.5 MHz
2.75 MHz
< 0.30 dB
< 20 ns
10.75 MHz
> 40 dB
50 ns
DR00171A
OACFA
75Ω
No
13.5 MHz
2.75 MHz
< 0.12 dB
< 12 ns
10.75 MHz
> 40 dB
58 ns
DR00171A
© Faraday Technology. As part of continual product improvement the specifications, details and dimensions shown in this publication are subject to change without notice
FARA068.DOC
Page 1 of 2
Jun-99(A)
FARADAY [ FARADAY TECHNOLOGY ]
