MN86157 Datasheet, PDF (1/8 Pages) Panasonic Semiconductor – Shading Correction LSI

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 V_SS
18 V_DD
17 N.C.
16 VREFL
15 VIN
14 VREFH
13 V_DD
12 OE
(TOP VIEW)
QFP044-P-1010