ML6440 Datasheet, PDF (1/18 Pages) Micro Linear Corporation – Multi-Standard 8-bit Adaptive Digital Input Comb Filter

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
s 3-line comb with 60+ line frame adjust
s Comb/notch thresholds set dynamically over 60+ lines
automatically
s 12-bit processing minimizes truncation errors and
maintains signal-to-noise performance
s Optional 8-bit composite or separated Y/C digital inputs
s Applications: digital TV, line doubler, imaging
s Separate comb/notch filter thresholds for Luma and
Chroma channels
s Optional pin controls or two-wire serial control
interface
s Operating power dissipation less than 700mW
s No external components, except diode and caps
BLOCK DIAGRAM
* This Part Is End Of Life As Of August 1, 2000
YI0/CV0
18
YI1/CV1
19
YI2/CV2
20
YI3/CV3
21
YI4/CV4
22
YI5/CV5
23
24 ^YI6/CV6
YI7/CV7
25
DIGITAL
CLK
7
CLOCK BUFFER
LUMA BYPASS
1HDL
MUX
1HDL
BANDSPLIT
FILTERS
(NOTCH/DELAY)
RST
6
RESET LOGIC
CI0/DI0 PAL/NTSC MODE
8
D0
9 ^{CI1/DI1 CCIR601/SQ. PIXEL MODE D1}
CI2/DI2 COMB MODE 0
10
D2
CI3/DI3 COMB MODE 1
11
D3 ^FILTER
AND
CI4/DI4
12
THRESHOLD CONTROL 0
D4
COMB
CI5/DI5
13
THRESHOLD CONTROL 1
D5
CONTROL
14 ^{CI6/DI6 THRESHOLD CONTROL 2 D6}
CI7/DI7 Y+C/CV INPUT MODE
15
D7
CONTROL
HIGH BAND
LOW BAND
HIGH BAND
LOW BAND
TOTAL BAND
HIGH BAND
LOW BAND
S/P
26
S DATA _{S CLK}
28
29
GND GND
4
17
5
VCC
16
AVCC
39
VCC
SmartComb™
COMB
ADAPTION
AND
DECISION
LOGIC
GND
38
CHROMA
BYPASS
DIGITAL
Y7
30
Y6
31
Y5
32
Y4
33
Y3
34
Y2
35
Y1
36
Y0
37
OE ₂₇
DIGITAL
C7
40
C6
41
C5
42
C4
43
C3 ₄₄
C2
1
C1
2
C0
3
1