OB SERIES
VIDEO OVERSAMPLING SMD FILTERS
•
Surface Mount Package
•
Flat or Sinx/x versions
•
Small size, low cost
•
Luminance and Chrominance versions
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 good amplitude and group delay characteristics
in the passband that meet requirements of CCIR601, but due to the above considerations do not have
significant attenuation below 21 MHz.
Order code
Filter Shape
Impedance
Sinx/x correction
Sampling Freq.
End of Passband
Amp. ripple to 5.5 MHz
to 5.75 MHz
G.D. ripple
Start of stopband
Stopband atten. wrt 100 kHz
Delay time nom. at 200 kHz
Aqueous Washable
SMD Reflow Limitations
Package
OBYSB
Lowpass
75
Ω
Yes
27.0 MHz
5.75 MHz
< 0.05 dB
< 0.1 dB
< 6 ns
21.5 MHz
> 40 dB
55 ns
Yes
OBYFB
Lowpass
OBCSB
Lowpass
OBCFB
Lowpass
75
Ω
No
13.5 MHz
2.75 MHz
< 0.05 dB
< 0.1 dB
< 12 ns
10.75 MHz
> 40 dB
116 ns
Yes
75
Ω
75
Ω
No
Yes
27.0 MHz
13.5 MHz
5.75 MHz
2.75 MHz
< 0.05 dB
< 0.05 dB
< 0.1 dB
< 0.1 dB
< 6 ns
< 12 ns
21.5 MHz
10.75 MHz
> 40 dB
> 40 dB
58 ns
110 ns
Yes
Yes
refer to Data Sheet Fara309
DR00325A
© Faraday Technology. As part of continual product improvement the specifications, details and dimensions shown in this publication are subject to change without notice
FARA084d
Page 1 of 2
Jul-03(E)
FARADAY [ FARADAY TECHNOLOGY ]
