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LM9800CCV
8-Bit Greyscale/24-Bit Color Linear CCD Sensor Processor
LM9800
8-Bit Greyscale/24-Bit Color Linear CCD Sensor
Processor
General DescriptionThe LM9800isa high performance integrated signal
processor/digitizerfor linear CCD image scanners. The
LM9800 performsallthe analog processing (correlated
double samplingfor black level and offset compensation,
pixel-by-pixel gain adjust,and 8-bit analog-to-digital conver-
sion) necessaryto maximizethe performanceofa wide
rangeof linear CCD sensors.
The LM9800 canbe digitally programmedto work witha
wide varietyof CCDs from different manufacturers.An inter-
nal configuration register sets CCD and sampling timingto
maximize performance, simplifyingthe designand manufac-
turing processes.
The LM9800canbe usedwith sequentialor parallel output
colorCCDs. Coarse gain switching bringsweak Bluesignalsto Red/Green levelsfor best performance.For comple-
mentary voltage referenceseethe LM4041.
Applications Colorand Greyscale Flatbedand Sheetfed Scanners General Purpose CCD Imaging
Features2.5 million pixels/s conversion rate Implements Correlated Double Samplingfor minimum
noiseand offset error Pixel-to-pixel gain correctionfor individual pixels
maximizes dynamic rangeand resolution, evenon
“weak” pixels Referenceand signal sampling points digitally controlled 25ns incrementsfor maximum performance Generatesall necessary CCD clock signals Compatible witha wide rangeof linear CCDs TTL/CMOS input/output compatible
Key Specifications Resolution 8Bits Pixel Conversion Rate 2.5MHz Supply Voltage +5V ±5% Supply Voltage (DigitalI/O) +3.3V ±10%or +5V ±5% Power Dissipation 210 mW (typ)
Connection DiagramTRI-STATE®isa registeredtrademark ofNationalSemiconductorCorporation.
MICROWIRE™ isatrademark ofNationalSemiconductor Corporation.
DS012498-1
September 1997
LM9800
8-Bit
Greyscale/24-Bit
Color
Linear
CCD
Sensor
Processor©1997NationalSemiconductor Corporation DS012498
