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LF3330QC12 Datasheet

  • LF3330QC12

  • Vertical Digital Image Filter

  • 15頁(yè)

  • LOGIC

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LF3330
DEVICES INCORPORATED
Vertical Digital Image Filter
LF3330
DEVICES INCORPORATED
Vertical Digital Image Filter
DESCRIPTION
The
LF3330
filters digital images in
the vertical dimension at real-time
video rates. The input and coefficient
data are both 12 bits and in two鈥檚
complement format. The output is
also in two鈥檚 complement format and
may be rounded to 16 bits.
The filter is an 8-tap FIR filter with all
required line buffers contained on-
chip. The line buffers can store video
lines with lengths from 4 to 3076
pixels.
Multiple LF3330s can be cascaded
together to create larger vertical
filters.
Due to the length of the line buffers,
interleaved data can be fed directly
into the device and filtered without
separating the data into individual
data streams. The number of inter-
leaved data sets that the device can
handle is limited only by the length of
the on-chip line buffers. If the inter-
leaved video line has 3076 data values
or less, the filter can handle it.
The LF3330 contains enough on-board
memory to store 256 coefficient sets.
The LF Interface
TM
allows all 256
coefficient sets to be updated within
vertical blanking.
Selectable 16-bit data output with
user-defined rounding and limiting
minimizes the constraints put on
coefficient sets for various filter
implementations.
FEATURES
u
83 MHz Data Rate
u
12-bit Data and Coefficients
u
On-board Memory for 256
Coefficient Sets
u
LF Interface
TM
Allows All 256
Coefficient Sets to be Updated
Within Vertical Blanking
u
Selectable 16-bit Data Output with
User-Defined Rounding and
Limiting
u
Seven 3K x 12-bit, Programmable
Two-Mode Line Buffers
u
Separate Input Port for Odd and
Even Field Filtering
u
u
u
u
u
u
8 Filter Taps
Cascadable for More Filter Taps
Supports Interleaved Data Streams
3.3 Volt Power Supply
5 Volt Tolerant I/O
100 Lead PQFP
LF3330 B
LOCK
D
IAGRAM
12
DIN
11-0
3K LINE BUFFER
8-TAP VERTICAL FILTER
256 COEFFICIENT SET STORAGE
3K LINE BUFFER
3K LINE BUFFER
32
12
VB
11-0
3K LINE BUFFER
ROUND
SELECT
LIMIT
CIRCUITRY
OED
16
DOUT
15-0
3K LINE BUFFER
3K LINE BUFFER
3K LINE BUFFER
12
COUT
11-0
OEC
Video Imaging Products
1
11/08/2001鈥揕DS.3330-M

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