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MN86157 Datasheet

  • MN86157

  • Shading Correction LSI

  • 8頁

  • PANASONIC

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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.
Pin Assignment
Features
Choice of correction range (50% or 75%) depending
on extent of shading distortion
Parallel A/D converter functions
Resolution: 7 bits
Non-linearity:
鹵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
鹵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
D5
D6
ROS
MOE
OVF/DB6
DB5
DB4
DB3
DB2
DB1
DB0
1
2
3
4
5
6
7
8
9
10
11
A5
A4
A3
A2
A1
A0
D0
D1
D2
D3
D4
34
35
36
37
38
39
40
41
42
43
44
33
32
31
30
29
28
27
26
25
24
23
A6
A7
A8
A9
A10
A11
N.C.
MODE
ENBO
CKSH
ENBI
22
21
20
19
18
17
16
15
14
13
12
SHST
R/W
INHI
V
SS
V
DD
N.C.
VREFL
VIN
VREFH
V
DD
OE
(TOP VIEW)
QFP044-P-1010

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