San Jose, Calif - Fairchild Semiconductor’s FMS6406
is the industry’s most highly integrated standard definition, low-pass reconstruction video filter/driver.
This device features an integrated sound notch and output drivers that meet the latest cable and satellite set-top
box performance requirements of 170 ns group delay predistortion. The FMS6406 compensates for the inherent
distortion in the TV receiver by including a group delay and chroma-luma delay FCC predistortion circuit that
prevents the image’s high-frequency edges from appearing distorted on the TV screen. The notch filter creates
a window in the video signal at approximately 4.5 MHz to eliminate interference between the audio and video before
these signals are combined in the channel 3 / 4 RF modulator.
“Fairchild’s highly integrated video filter reduces board space by 30% to 40% by effectively replacing
discrete reconstruction filters, an external sound notch and group delay compensation circuits and cable drivers,
while increasing system reliability in set-top box and personal video recorder (PVR) applications. This integration
translates into significant board savings,” says Jeremy Tole, Fairchild’s technical marketing manager,
Video Products. “The FMS6406 answers a pressing need in the set-top box and PVR market by providing a highly
efficient and inherently low-cost system solution.”
Fairchild’s FMS6406, a 5th order video
filter, eliminates unwanted digital artifacts by significantly reducing the clock and image frequencies after the
digital-to-analog conversion process occurs on an MPEG chip. This video filter/driver is also capable of DC coupling
on the outputs to improve the low-frequency video, while at the same time eliminating the need for three large
Typical designs for set-top boxes offer both S-video and composite-video outputs.
Fairchild’s FMS6406 offers separate chrominance and luminance outputs to directly drive the S-video output.
These outputs are also internally summed to form a composite video signal. The composite- and S-video outputs
provide a fixed gain of 6 dB and offer the flexibility of either AC or DC coupling.
Key features include:
Dual 5th order 7.6 MHz low-pass filters eliminate unwanted digital artifacts;
• RF modulator
support –– Integrated equalizer and sound notch filter for driving the RF modulator;
• 4.5 MHz sound trap removes video noise in the spectral location of the subsequent FM audio carrier;
• 170 ns group delay / chroma-luma delay predistortion for NTSC applications (as required for
broadcast transmitters by the FCC) compensates for the inherent receiver IF filter’s group delay
• AC-coupled inputs and a DC restoration circuit for low tilt;
• The inputs are Y/C and include a Y sync tip clamp and chroma blanking clamp;
filtered outputs are Y/C and CV with 50 dB stopband attenuation at 27 MHz and better than 0.5 dB flatness to 4.2
• All outputs are capable of driving 2 Vpp, AC- or DC-coupled, into either a single or
dual 75 Ohm video load; and
• Internal chroma-luma summing circuit for driving composite
The FMS6406 is offered in a space-saving 8-pin SOIC package. This product is lead
(Pb)-free and meets or exceeds the requirements of the joint IPC/JEDEC standard J-STD-020B and is compliant with
European Union requirements now in effect.
Price: (1,000 pcs) –– FMS6406CS
(rail) and FMS6406CSX (tape reel) both US$1.69
Delivery: 12-16 weeks