LF2272 LODEV [LOGIC Devices Incorporated], LF2272 Datasheet

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LF2272

Manufacturer Part Number
LF2272
Description
Colorspace Converter/Corrector (3 x 12-bits)
Manufacturer
LODEV [LOGIC Devices Incorporated]
Datasheet
DEVICES INCORPORATED
LF2272 B
FEATURES
DEVICES INCORPORATED
50 MHz Data and Computation
Rate
Full Precision Internal Calculations
with Output Rounding
On-board 10-bit Coefficient Storage
Overflow Capability in Low
Resolution Applications
Two’s Complement Input and
Output Data Format
3 Simultaneous 12-bit Channels
(64 Giga Colors)
Applications:
Replaces TRW/Raytheon/Fairchild
TMC2272
120-pin PQFP
• Component Color Standards
• Color-Temperature Conversion
• Image Capturing and Manipulation
• Composite Color Encoding/
• Three-Dimensional Perspective
COEFFICIENT
Translations (RGB, YIQ, YUV)
Decoding
Translation
INPUTS
INPUTS
DATA
LOCK
{
{
CWEL
D
IAGRAM
KC
KA
KB
C
A
B
CLK
11-0
11-0
11-0
9-0
9-0
9-0
1-0
10
10
10
12
12
12
2
The LF2272 is a high-speed digital
colorspace converter/corrector
consisting of three simultaneous 12-bit
input and output channels for func-
tionality up to 64 Giga (2
Some of the applications the LF2272
can be used for include phosphor
colorimetry correction, image captur-
ing and manipulation, composite color
encoding/decoding, color matching,
and composite color standards
conversion/transcoding.
The 3 x 3 matrix multiplier (triple dot
product) allows users to easily per-
form three-dimensional perspective
translations or video format conver-
sions at real-time video rates. By
using the LF2272, conversions can be
made from the RGB (color compo-
nent) format to the YIQ (quadrature
encoded chrominance) or YUV (color
difference) formats and vice versa
(YIQ or YUV to RGB). Differing signal
formats in each stage of a system can
be disregarded. For example, using
DESCRIPTION
9-MULTIPLIER
ARRAY
1
36
) colors.
Colorspace Converter/
Corrector (3 x 12-bits)
12
an LF2272 at each format interface
allows each stage of a system to
operate on the data while in the
appropriate format.
All inputs and outputs, as well as all
control lines, are registered on the
rising edge of clock. The LF2272
operates at clock rates up to 50 MHz
over the full commercial temperature
and supply voltage ranges. A nar-
rower data path can be used to allow
the LF2272 to work with many
different imaging applications.
DETAILS OF OPERATION
All three input ports (A, B, C) and all
three output ports (X, Y, Z) are
utilized to implement a 3 x 3 matrix
multiplication (triple dot product).
Each truncated 12-bit output is the
sum of all three input words multi-
plied by the appropriate coefficients
(Table 1). The pipeline latency is five
clock cycles. Therefore, the sum of
12
12
Video Imaging Products
Colorspace Converter/
Corrector (3 x 12-bits)
X
Y
Z
11-0
11-0
11-0
LF2272
DATA
OUTPUTS
08/16/2000–LDS.2272-I
LF2272

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LF2272 Summary of contents

Page 1

... All inputs and outputs, as well as all control lines, are registered on the rising edge of clock. The LF2272 operates at clock rates MHz over the full commercial temperature and supply voltage ranges. A nar- rower data path can be used to allow the LF2272 to work with many different imaging applications ...

Page 2

... KC) are 10-bit fractional two’s complement format. Refer to Figures 1a and 1b. BIT WEIGHTING The internal sum of products of the LF2272 can grow to 23 bits. However, in order to keep the output format identical to the input format, the X, Y, and Z outputs are rounded to 12-bit integer words. The rounding is done ...

Page 3

... X, Y, and Z are the 12-bit registered data output ports. Controls CWEL — Coefficient Write Enable 1-0 The registered coefficient write enable inputs determine which internal coefficient register set to update (Table 3) on the next clock cycle. 3 LF2272 Colorspace Converter/ Corrector (3 x 12-bits ABLE OEFF EG PDATE ...

Page 4

... D F IGURE ETAILED UNCTIONAL CWEL D IAGRAM KA1 21 KB1 KB2 21 KC1 KC2 (MSB) 12 (MSB Colorspace Converter/ Corrector (3 x 12-bits) KA2 KA3 21 21 KB3 21 21 KC3 21 12 (MSB Video Imaging Products LF2272 08/16/2000–LDS.2272-I ...

Page 5

... OH Vcc = Min 4 (Note 3) Ground V V (Note 12 (Note 12) (Notes 5, 6) (Note 25° MHz 25° MHz A 5 LF2272 Colorspace Converter/ Corrector (3 x 12-bits Voltage Supply Min Typ Max Unit 2 ...

Page 6

... D KA1 + KB1 + KC1 KA2 + KB2 + KC2 KA3 + KB3 + KC3 Video Imaging Products 08/16/2000–LDS.2272-I LF2272 20 Max Max 20 8 ...

Page 7

... ENA OE 1 Measured V with I = –10mA and Measured V with I = –10mA and Video Imaging Products LF2272 test, DIS C IRCUIT EVELS t DIS 3.0V Vth 0 0 Vth = 10mA OL = 10mA OL 08/16/2000–LDS.2272-I ...

Page 8

... Speed 0°C to +70°C — C OMMERCIAL –40°C to +85°C — C OMMERCIAL Top View Plastic Quad Flatpack (Q1) S CREENING LF2272QC25 LF2272QC20 S CREENING 8 LF2272 Colorspace Converter/ Corrector (3 x 12-bits CLK ...

Page 9

... GND CWEL CWEL Video Imaging Products LF2272 08/16/2000–LDS.2272-I ...

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