TMC22X5YA datasheet(45/84 Pages) CADEKA

45 / 84 page

PRODUCT SPECIFICATION

TMC22x5yA

REV. 1.0.0 2/4/03

Comb Filter Input

The inputs to the comb ﬁlter are selected from either the high

frequency outputs of the bandsplit ﬁlters, if using a chroma

comb ﬁlter, or the full composite waveforms when imple-

menting a luma comb. The two sets of high and low fre-

quency signals from the bandsplit ﬁlters are used for both the

luma and chroma SIMPLE signals, and in the generation of

the comb fail signals. These signals are denoted xHL, xHH,

and xHF where L denotes the low frequency portion of the

signal, H the high frequency portion of the signal and F the

full frequency spectrum of the input signal from line x; and

are shown in Figure 15.

Table 2. Normalized Subcarrier Frequency as a Function of Pixel Data Rates

Pixel Rate (MHz)

FSC

(MHz)

Normalized FSC

Comments

12.27

3.57954545

0.2917

NTSC square pixel rate

13.50

3.57954545

0.2652

NTSC D1 pixel rate

13.50

4.43361875

0.3284

PAL-I D1 pixel rate

14.32

3.57954545

0.2500

NTSC four times subcarrier (D2/D3)

14.75

4.43361875

0.3006

PAL-I square pixel rate

15.00

4.43361875

0.2956

PAL-I square pixel rate

17.73

4.43361875

0.2500

PAL-I four times subcarrier (D2/D3)

13.5

3.57561149

0.2649

PAL-M D1 pixel rate

13.5

3.58205625

0.2653

PAL-N D1 pixel rate

14.30

3.57561149

0.2500

PAL-M four times subcarrier (D2/D3)

Figure 13. Bandsplit Filter, Full Frequency Response

Figure 14. Bandsplit Filter, Passband Response

-70

-60

-50

-40

-30

-20

-10

Normalized Frequency

Bandsplit Filter 1

Bandsplit Filter 2

-6

-5

-4

-3

-2

-1

Normalized Frequency

Bandsplit Filter 1

Bandsplit Filter 2

TMC22X5YA Datasheet(PDF) 45 Page - Cadeka Microcircuits LLC.

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