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PDF MN86157 Data sheet ( Hoja de datos )
| Número de pieza | MN86157 | |
| Descripción | Shading Correction LSI | |
| Fabricantes | Panasonic Semiconductor | |
| Logotipo |  |
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For Communications Equipment
MN86157
Shading Correction LSI
Overview
The MN86157 contains a 7-bit A/D converter for use
in correcting, at the bit level, shading distortion for sig-
nals from image sensors, optics, and similar sources.
It uses external RAM to support adaptive correction
that responds to changes in distortion patterns. It also uses
ROM to provide fixed correction when a white reference
plane signal is not available.
The chip is also usable as a stand-alone A/D converter.
Features
Choice of correction range (50% or 75%) depending
on extent of shading distortion
Parallel A/D converter functions
Resolution: 7 bits
Non-linearity: ±1/2 LSB
Conversion speed: max. 5 MHz
Note: This is the guaranteed design value for the
chip used as a stand-alone A/D converter. The
guaranteed value at shipment is ±3 LSB
Ability to start and stop clock in the middle of a line
to support CdS contacting image sensors and other
devices with variable scanning rates
Overflow pin that simplifies task of adding auto
background control (ABC) circuit
Single 5 volt power supply
Guaranteed TTL levels for input
Applications
Facsimile equipment
Pin Assignment
A5 34
A4 35
A3 36
A2 37
A1 38
A0 39
D0 40
D1 41
D2 42
D3 43
D4 44
22 SHST
21 R/W
20 INHI
19 VSS
18 VDD
17 N.C.
16 VREFL
15 VIN
14 VREFH
13 VDD
12 OE
(TOP VIEW)
QFP044-P-1010
1 page  
For Communications Equipment
MN86157
Pin Descriptions
Parameter Pin No.
A/D 15
converter
14
block
16
MULT
11 to 6
converter
block
5
12
CTL
converter
block
23
22
24
20
25
3
26
RAM
/ROM
IO
converter
block
39 to 28
40 to 44,
1, 2
21
4
Symbol
VIN
VREFH
VREFL
DB 0 to 5
I/O
I
—
—
O
OVF/DB6 O
OE I
ENBI
SHST
I
I
CKSH
I
INHI
I
ENBO
O
ROS
MODE
A 0 to 11
D 0 to 6
R/W
MOE
I
I
O
I/O
O
O
Function Description
Analog image signal input
Remarks
Reference voltage input
"H" level reference voltage input
Reference ground
"L" level reference voltage input
Corrected image signal output MODE: H
/A/D converter data output
/MODE: L
Corrected image signal overflow MODE: H
output/A/D converter data output /MODE: L
Output enable signal input
H: Pins are high-impedance;
for DB0 – DB5 and OVF
L: Pins provide output
Enable signal input for single line
Start input for reading white
Low pulse
reference signal
signals start.
Clock signal input
The frequency must be twice
that of the image clock.
Signal for suspending correction in H: Normal correction
the middle of a line and holding operation;
the output at the current value L: Stop and hold
Enable signal for corrected
image data output
Correction range selection
H: 50% correction;
L: 75% correction
Operating mode selection
H: Shading correction;
L: A/D conversion only
RAM/ROM address output
RAM/ROM data I/O
RAM read/write signal
RAM/ROM output enable signal
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MN86157.PDF ] | |
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