LF2246 LODEV [LOGIC Devices Incorporated], LF2246 Datasheet

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LF2246

Manufacturer Part Number
LF2246
Description
11 x 10-bit Image Filter
Manufacturer
LODEV [LOGIC Devices Incorporated]
Datasheet

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LF2246GC
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DEVICES INCORPORATED
FEATURES
LF2246 B
DEVICES INCORPORATED
66 MHz Data and Coefficient Input
and Computation Rate
Four 11 x 10-bit Multipliers with
Individual Data and Coefficient
Inputs and a 25-bit Accumulator
User-Selectable Fractional or
Integer Two’s Complement Data
Formats
Fully Registered, Pipelined Archi-
tecture
Input and Output Data Registers,
with User-Configurable Enables
Three-State Outputs
Fully TTL Compatible
Ideally Suited for Image Processing
and Filtering Applications
Replaces TRW/Raytheon/Fairchild
TMC2246
120-pin PQFPP
LOCK
ENSEL
FSEL
OEN
ACC
CLK
D
IAGRAM
10
D1
9–0
C1
10–0
TO ALL REGISTERS
11
22
ENB1
The LF2246 consists of an array of
four 11 x 10-bit registered multipliers
followed by a summer and a 25-bit
accumulator. All multiplier inputs
are user accessible and can be up-
dated every clock cycle with either
fractional or integer two’s comple-
ment data. The pipelined architecture
has fully registered input and output
ports and an asynchronous three-state
output enable control to simplify the
design of complex systems. The
pipeline latency for all inputs is five
clock cycles.
Storage for mixing and filtering
coefficients can be accomplished by
holding the data or coefficient inputs
over multiple clock cycles. A 25-bit
accumulator path allows cumulative
word growth which may be internally
rounded to 16 bits. Output data is
updated every clock cycle and may be
held under user control. All inputs,
DESCRIPTION
10
D2
9–0
C2
10–0
11
2-11
MS
ENB2
S
15–0
LS
10
D3
25
9–0
11 x 10-bit Image Filter
C3
10–0
11
ENB3
outputs, and controls are registered
on the rising edge of clock, except for
OEN. The LF2246 operates at a clock
rate of 66 MHz over the full tempera-
ture and supply voltage ranges.
The LF2246 is applicable for perform-
ing pixel interpolation in image
manipulation and filtering applica-
tions. The LF2246 can perform a
bilinear interpolation of an image (4-
pixel kernels) at real-time video rates
when used with an image resampling
sequencer. Larger kernels or more
complex functions can be realized by
utilizing multiple devices.
Unrestricted access to all data and
coefficient input ports provides the
LF2246 with considerable flexibility in
applications such as digital filters,
adaptive FIR filters, mixers, and other
similar systems requiring high-speed
processing.
OCEN
22
Video Imaging Products
11 x 10-bit Image Filter
10
D4
9–0
C4
10–0
11
LF2246
ENB4
08/16/2000–LDS.2246-K
LF2246

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LF2246 Summary of contents

Page 1

... ACC FSEL OEN CLK DESCRIPTION The LF2246 consists of an array of four 11 x 10-bit registered multipliers followed by a summer and a 25-bit accumulator. All multiplier inputs are user accessible and can be up- dated every clock cycle with either fractional or integer two’s comple- ment data ...

Page 2

... LSB rounding to 16 bits is per- formed on the result. This allows sum- mations without propagating roundoff errors. When ACC is HIGH, the emerg- ing product is added to the sum of the previous products, without additional rounding. Video Imaging Products LF2246 C ONTROL HELD ’ N ’ N ...

Page 3

... Min 4 (Note 3) Ground V V (Note 12 (Note 12) (Notes 5, 6) (Note 25° MHz 25° MHz A 2-13 LF2246 11 x 10-bit Image Filter + 0 0 Voltage Supply Min Typ Max Unit 2.4 V 0.4 V 2.0 V ...

Page 4

... N–1 N Video Imaging Products 08/16/2000–LDS.2246-K LF2246 15 Max Max ...

Page 5

... ENA OE 1 Measured V with I = –10mA and Measured V with I = –10mA and Video Imaging Products 08/16/2000–LDS.2246-K LF2246 test, DIS C IRCUIT EVELS t DIS 3.5V Vth 0 0 Vth = 10mA OL = 10mA OL ...

Page 6

... Speed 0°C to +70°C — C OMMERCIAL –40°C to +85°C — C OMMERCIAL Top View Plastic Quad Flatpack (Q1) S CREENING LF2246QC25 LF2246QC15 S CREENING 2-16 LF2246 11 x 10-bit Image Filter ...

Page 7

... GND Video Imaging Products LF2246 08/16/2000–LDS.2246-K ...

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