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PDF LC821031 Data sheet ( Hoja de datos )
| Número de pieza | LC821031 | |
| Descripción | Image-Processing IC for Facsimile/ Copier/ and OCR Products | |
| Fabricantes | Sanyo Semicon Device | |
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Ordering number : EN*5735
Preliminaly
CMOS LSI
LC821031
Image-Processing IC for Facsimile, Copier,
and OCR Products
Overview
The LC821031 converts analog video signals from CCD
and contact sensors to high-quality binary image data. It
includes both an 8-bit A/D converter and a 6-bit D/A
converter for setting the reference potential and creates
high-quality multi-valued data using a gamma conversion
technique that supports arbitrary gamma curves. It also
provides both black and white all-pixel distortion
correction and multi-valued resolution conversion. It then
applies two-dimensional filtering to this multi-valued data
to separate the document image into text, photograph, and
halftone areas. After converting the image to a binary
image using an error diffusion technique that acquires
high-quality images, it applies reduction in both the
primary and secondary scan directions. Since the
LC821031 limits the number of pixels processed per line
to 3072 pixels, it needs no external memory to implement
this processing. Thus the LC821031 implements the image
processing used by facsimile, copier, and OCR products.
• Gamma correction (Supports user-defined curves: 8-bit
data)
• Image area separation
• Simple binary coding (fixed threshold and density
adaptive threshold)
• Halftone processing: error diffusion method (64 levels)
• Multi-value resolution conversion (Conversion ratios of
1:2, 2:3, 3:2, and 2:1)
• Binary image reduction (Main scan line direction:
decimation, fine black line retention, fine white line
retention; secondary scan line direction: decimation, fine
line retention)
• Fabricated in a CMOS process for single 5-V power-
supply and low power.
Package Dimensions
unit: mm
3159-QFP64E
[LC821031]
Features
• Number of pixels processed: 3072 pixels/line
• Processing speed: 250 ns/pixel, maximum (When
CLKIN = 32 MHz)
• 8-bit A/D converter (Includes a sensor signal timing
adjustment function.)
• 6-bit D/A converter for setting the A/D converter
reference potential
• Sensor drive circuit (Supports most CCD and CIS
devices.)
• Digital clamp (single-point clamping and even/odd
clamping)
• Distortion correction (white correction: all-pixel
correction, black correction: all-pixel correction)
SANYO: QIP64E
Specifications
Absolute Maximum Ratings at Ta = 25°C, GND = 0 V
Parameter
Maximum supply voltage
Input and output voltage
Allowable power dissipation
Operating temperature
Storage temperature
Soldering conditions
Symbol
VDD max
VI, VO
Pd max
Topr
Tstg
Conditions
Ta ≤ 70°C
Hand soldering: 3 seconds
Reflow soldering: 10 seconds
Ratings
–0.3 to +7.0
–0.3 to VDD+0.3
350
–30 to +70
–55 to +125
350
235
Unit
V
V
mW
°C
°C
°C
°C
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-0005 JAPAN
22898HA (OT) No. 5735-1/5
1 page  
Sample Application Circuit
LC821031
A12 to A0
D7 to D0
PD7 to PD0
• Use a 0.01 µF monolithic capacitor for C1.
• Applications must set up the polarity of the image signal from the sensor so that white data is at the highest potential
and black data is at the lowest. If the peak level in the image signal from the sensor does not reach 4.2 V, a level
conversion circuit should be added to allow the application to take advantage of the dynamic range of the internal D/A
converter.
• Although AGND and DGND are fully isolated from each other within the IC, AVDD and DVDD are connected through
the substrate. Therefore applications must be designed so that there is no potential difference between AVDD and
DVDD. Also, the rise and fall of these power-supply potentials must occur within 3 ms of each other.
s No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace
equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of
which may directly or indirectly cause injury, death or property loss.
s Anyone purchasing any products described or contained herein for an above-mentioned use shall:
Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and
distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all
damages, cost and expenses associated with such use:
Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on
SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees
jointly or severally.
s Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for
volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied
regarding its use or any infringements of intellectual property rights or other rights of third parties.
This catalog provides information as of February, 1998. Specifications and information herein are subject to
change without notice.
PS No. 5735-5/5
5 Page | ||
| Páginas | Total 5 Páginas | |
| PDF Descargar | [ Datasheet LC821031.PDF ] | |
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