TMC22053KHC Fairchild Semiconductor, TMC22053KHC Datasheet - Page 46

• Manufacturer Part Number: TMC22053KHC
• Manufacturer: Fairchild Semiconductor

Specifications of TMC22053KHC

• Screening Level: Commercial
• Package Type: MQFP
• Pin Count: 100
• Lead Free Status / RoHS Status: Compliant

TMC22x5y
Adaptive Comb Filter
The IPCF[1:0] register bits select the inputs to the adaptive
comb filter, this would normally be xHH for chroma combs,
xHF for luma combs, and xHL if the luminance signal was to
be sampled dropped on the output of the TMC22x5y. The
Gaussian filters in the sample drop mode already limit the
chrominance bandwidth to 1.3MHz allowing a [2:1:1] data
format on the output, with the luminance signal having been
vertically filtered by a fixed 3 line comb filter.
The SIMP selection bit is an internally generated signal
based upon the comb filter selected. If a 3 line chroma, luma,
or D1 comb filter is selected, due to the internal 1H delay
inherent with this type of comb filter, the 1HL and 1HH
signals are selected for the respective luma and chroma
SIMPLE data signals. When any other type of comb filter is
selected 0HL and 0HH are selected.
The DLYF selection bit is also internally generated from the
type of comb filter selected and whether or not the input is in
either the YC or Y & CbCr (ie D1 input) data formats. The
46
VideoB
OHH
OHF
OHL
1HH
2HH
1HF
2HF
1HL
2HL
Figure 16. Signal Flow Around the Adaptive Comb Filter.
IPCF[1:0]
IPCF[1:0]
IPCF[1:0]
MUX
MUX
MUX
3:1
3:1
3:1
Adaptive
Comb
Filter
SIMP
MUX
MUX
MUX
DLYF
SIMP
2:1
3:1
2:1
VIDEOB data is always selected when the YCCOMP register
bit is HIGH, ie for YC inputs. The selection of 1HF or 0HF
depends upon the SIMP selection bit only when the
YCCOMP register bit is LOW. Therefore, when YCCOMP is
LOW and 0Hx is selected by SIMP then 0HF is selected for
the FLAT signal, and when 1Hx is selected by SIMP then
1HF is selected for the FLAT signal. This ensures that the
FLAT and SIMPLE data selected for any comb filter is
delayed by the same amount as the data processed through
the comb filter to produce the COMB output.
The final selection is the output required for the combed
luminance and chrominance data. The output selection can
be SIMPLE, COMB, FLAT-COMB, or FLAT. Generally
COMB is selected based upon whether a luma or chroma
comb was selected and the complementary output selects
FLAT-COMB. In the YC and Y & CbCr data modes the FLAT
signal selects the secondary data and SIMPLE or COMB can
be used to select the primary signal. In these modes the
bandsplit filter can be bypassed or used to remove low fre-
quency noise from the chrominance signal if chroma was
selected as the primary signal.
–
A: Comb
B: Simple
C: Flat - Comb
D: Flat
A
B
C
D
A
B
C
D
CMUX[1:0]
YMUX[1:0]
MUX
MUX
4:1
4:1
PRODUCT SPECIFICATION
65-22x5y-57
C Data
Y Data