STW8019 datasheet(16/66 Pages) STMICROELECTRONICS

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STw8009/STw8019

Functional description

15/65

4.6

Sub-carrier generation

A Direct Digital Frequency Synthesizer (DDFS) generates the required color sub-carrier

frequency using a 24-bit phase accumulator. Sub-carrier frequency is programmable with a

1.6 Hz step.

4.7

Luminance encoding

The luminance that is added to the chrominance to create the composite CVBS signal can

be trap-filtered at 3.58 MHz (NTSC) or 4.43 MHz (PAL). This supports application oriented

towards low-end TV sets which are subject to cross-color.

A 7.5 IRE pedestal can be programmed if needed with all standards. This allows in

particular to encode Argentinian and non-Argentinian PAL-N, or Japanese NTSC.

A programmable delay can be inserted on the luminance path to offset any chroma/luma

delay introduced by off-chip filtering.

STw80x9 output signals are IF modulated in NTSC M standard so that a sound notch filter is

required. The notch filter which is on the Luma path is defined by a set of coefficients and is

implemented in the STw80x9 as default values. The set is also programmable.

Table 2.

NTSC and PAL timings

NTSC-M

PAL-BDGHI

PAL-N

PAL-M

a(1)

These are typical values. Actual values will depend on the static offset programmed for subcarrier

generation

5.38

μs (even lines)

5.52

μs (odd lines)

5.54

μs (A-type)

5.66

μs (B-type)

5.54

μs (A-type)

5.66

μs (B-type)

5.73

μs (A-type)

5.87

μs (B-type)

1.56

μs1.3 μs1.3 μs1.56 μs

1.56

μs1.52 μs

1.52

μs1.56 μs

8.8

μs9.6 μs9.6 μs8.8 μs

9.41

μs10.48 μs10.48 μs9.41 μs

9 cycles of 3.58MHz

10 cycles of 4.43MHz

9 cycles of 3.58MHz

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