Video Oversampling Filters
SIL RANGE
Features
•
•
Space saving SIL package
Sinx/x Selectable or Flat 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 combined with 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.
An analogue filter is required to attenuate the clock and sideband to reconstruct the signal. 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 need
significant attenuation below 21 MHz.
Order code
Impedance
Sinx/x correction
Sampling Frequency
End of Passband
Amp. Ripple
G.D. ripple
Start of stopband
Stopband atten.
2
Delay time nom.
3
Aqueous Washable
Package
1
2
Flat
Sinx/x
1
Flat
Sinx/x
FL676
75
Ω
No
27.0 MHz
5.75 MHz
< 0.1 dB
-
< 6 ns
-
21.5 MHz
>40 dB
30 ns
Yes
DR00034A
FL714
75
Ω
Selectable
27.0 MHz
5.75 MHz
< 0.1 dB
< ± 0.2 dB
< 6 ns
< 10 ns
21.5 MHz
> 40 dB
27 ns
Yes
DR00064B
FL677
75
Ω
No
13.5 MHz
2.75 MHz
< 0.1 dB
-
< 12 ns
-
10.75 MHz
> 40 dB
58 ns
Yes
DR00034A
FL715
75
Ω
Selectable
13.5 MHz
2.75 MHz
< 0.1 dB
< ± 0.2 dB
< 12 ns
< 20 ns
10.75 MHz
> 40 dB
50 ns
Yes
DR00064B
Sinx/x amplitude ripple measured wrt 100 kHz
Stopband attenuation measured wrt 100 kHz
3
Nominal delay time measured at 200 kHz
Other package sizes and styles are available
© Faraday Technology. As part of continual product improvement the specifications, details and dimensions shown in this publication are subject to change without notice
Fara070d
Page 1 of 2
Aug-05(C)
FARADAY [ FARADAY TECHNOLOGY ]
