The FMS6403 offers comprehensive filtering for TV, set-top box, or DVD
applications. This part consists of a triple, sixth-order filter with selectable
30MHz, 15MHz, or 8MHz cutoff frequency. The filters may also be bypassed so that
the bandwidth is limited only by the output amplifiers.
A 2:1 multiplexer is provided on each filter channel. The triple filters are
intended for YPbPr and RGB signals. The DC clamp levels are set according to the
RGB_SEL control input. YPbPr sync tips are clamped to 250mV, 1.125V, and 1.125V,
respectively; while RGB sync tips are all clamped to 250mV. Sync clamp timing
can be derived from the Y/G inputs or from the external SYNC_IN pin. The 8MHz
and 15MHz filter settings support bi-level sync, while the 30MHz filter setting
and bypass mode support tri-level sync.
All channels nominally accept AC-coupled 1VPP signals. Selectable
0dB or 6dB gain allows the outputs to drive 1VPP or 2VPP
signals into AC- or DC-coupled terminated loads with a 1VPP input.
Input signals cannot exceed 1.5VPP and outputs cannot exceed
2.5VPP.
|