lm9831 National Semiconductor Corporation, lm9831 Datasheet - Page 39
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lm9831
Manufacturer Part Number
lm9831
Description
42-bit Color, 1200dpi Usb Image Scanner
Manufacturer
National Semiconductor Corporation
Datasheet
1.LM9831.pdf
(41 pages)
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Analog Front End Block Diagram
from sensor
GREEN OS
from sensor
from sensor
BLUE OS
V
RED OS
REGULATOR
V
V
BANDGAP
V
REF MID
V
REF LO
REF HI
OS
OS
OS
B
R
G
3V (USB I/O)
Reference
Regulator
Bandgap
1.5V (CDS)
3.5V (CCD)
-1
-1
-1
1
1
1
CDS
CDS
CDS
Boost
x1or x3
x1or x3
x1or x3
Gain
39
Offset
+
+
DAC
+
Static
DACs
Offset
DAC
Offset
Offset
DAC
+
+
+
²
²
R
G
B
Balance PGAs
Coarse Color
x0.93
x0.93
x0.93
to x3
to x3
to x3
14 Bit
ADC
Generation
Sensor
Clock
14
www.national.com
ø1
ø2
RS
CP1
CP2
TR1
TR2