July 1999
PRELIMINARY
ML6440*
Multi-Standard 8-bit Adaptive Digital Input Comb Filter
GENERAL DESCRIPTION
The ML6440 SmartComb™ is a single-chip, 8-bit digital
comb filter that incorporates line delays and adaption
algorithms for NTSC and PAL at both CCIR601 and square
pixel rates. The ML6440 implements bandsplit filters and
a proprietary adaption and decision logic block that
allows for optimum combing over a wide range of video
sources.
The ML6440 contains all the necessary circuitry to provide
high quality combed output of luminance and
chrominance in the Y/C format. Internal filters with
integrated adaption and compensation circuits provide
filtered outputs with optimal video bandwidth and
resolution while suppressing cross-color (rainbow), cross-
luminance (dot crawl) and other corrupting artifacts that
can reduce video compression efficiency.
FEATURES
s
SmartComb algorithm for automatic or manual
selection adaption thresholds
3-line comb with 60+ line frame adjust
Comb/notch thresholds set dynamically over 60+ lines
automatically
12-bit processing minimizes truncation errors and
maintains signal-to-noise performance
Optional 8-bit composite or separated Y/C digital inputs
Applications: digital TV, line doubler, imaging
Separate comb/notch filter thresholds for Luma and
Chroma channels
Optional pin controls or two-wire serial control
interface
Operating power dissipation less than 700mW
No external components, except diode and caps
s
s
s
s
s
s
s
s
s
BLOCK DIAGRAM
18
19
20
21
22
23
24
25
* This Part Is End Of Life As Of August 1, 2000
5
16
39
VCC
YI0/CV0
YI1/CV1
YI2/CV2
YI3/CV3
YI4/CV4
YI5/CV5
LOW BAND
DIGITAL
LUMA BYPASS
AVCC
VCC
DIGITAL
Y7
Y6
LUMINANCE
OUTPUT BUFFER
Y5
Y4
Y3
Y2
Y1
MUX
1HDL
BANDSPLIT
FILTERS
(NOTCH/DELAY)
Y0
HIGH BAND
30
31
32
33
34
35
36
37
1HDL
HIGH BAND
YI6/CV6
YI7/CV7
CLK
RST
SmartComb™
COMB
ADAPTION
AND
DECISION
LOGIC
OE
7
CLOCK BUFFER
RESET LOGIC
LOW BAND
6
27
8
9
10
CI0/DI0
PAL/NTSC MODE
TOTAL BAND
D0
DIGITAL
C7
C6
CHROMINANCE
OUTPUT BUFFER
40
41
42
43
44
1
2
3
CI1/DI1
CCIR601/SQ. PIXEL MODE
D1
CI2/DI2
COMB MODE 0
CI3/DI3
COMB MODE 1
D2
D3
HIGH BAND
C5
C4
C3
C2
C1
C0
FILTER
11
AND
CI4/DI4
THRESHOLD CONTROL 0
D4
COMB
12
CONTROL
CI5/DI5
THRESHOLD CONTROL 1
D5
13
LOW BAND
CI6/DI6
THRESHOLD CONTROL 2
D6
14
15
CONTROL
CHROMA
BYPASS
CI7/DI7
Y+C/CV INPUT MODE
S/P
26
D7
S DATA
28
S CLK
29
GND
4
GND
17
GND
38
1
MICRO-LINEAR [ MICRO LINEAR CORPORATION ]
