VIDEO OVERSAMPLING SMD
FILTERS
OC SERIES
The OC series range of video oversampling SMD 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.
•
Surface mount compatible
•
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 OC range of oversampling filters can be used in surface mount assembly lines
allowing vacuum pick up and reflow.
In order to preserve the integrity of the signal these filters have a good amplitude and group delay
characteristics in the passband which meet 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 (dB)
G.D. ripple
Start of stopband
Stopband atten. wrt 100
kHz time nom. at 200 kHz
Delay
Aqueous Washable
SMD Reflow Limitations
OCYSA
150
Ω
Yes
27.0 MHz
5.75 MHz
< 0.05
to 5.5 MHz
< 0.1
to 5.75 MHz
< 6 ns
21.5 MHz
> 40 dB
55 ns
Yes
OCYFA
150
Ω
No
27.0 MHz
5.75 MHz
< 0.05
to 5.5 MHz
< 0.1
to 5.75 MHz
< 6 ns
21.5 MHz
>40 dB
58 ns
Yes
< 0.1
to 2.75 MHz
< 12 ns
10.75 MHz
> 40 dB
110 ns
Yes
refer to Data Sheet Fara309
< 0.1
to 2.75 MHz
< 12 ns
10.75 MHz
> 40 dB
116 ns
Yes
OCCSA
150
Ω
Yes
13.5 MHz
2.75 MHz
OCCFA
150
Ω
No
13.5 MHz
2.75 MHz
© Faraday Technology. As part of continual product improvement the specifications, details and dimensions shown in this publication are subject to change
without notice
FARA095d
Page 1 of 2
Sep-05(C)
FARADAY [ FARADAY TECHNOLOGY ]
