參數(shù)資料
型號(hào)： LM9831
廠商： National Semiconductor Corporation
英文描述： LM9831 42-Bit Color, 1200dpi USB Image Scanner
中文描述： LM9831 42位彩色，1200dpi的USB圖像掃描儀
文件頁(yè)數(shù)： 3/41頁(yè)
文件大?。?/td> 320K
代理商： LM9831
3
www.national.com
CCD/CIS Source Requirements for Full Specified Accuracy and Dynamic Range (Note 12)
V
CCDPEAK
Sensor’s Maximum Output Signal
Amplitude before LM9831 Analog Front
End Saturation
Gain = 0.933
Gain = 3.0
Gain = 9.0
1.9
0.6
0.19
V
V
V
Analog Input Characteristics
Average OS
R
, OS
G
, OS
B
Input Current
CDS Enabled, OS = 3.5V
DC
±3
nA
OS
R
, OS
G
, OS
B
Input Current
CDS Disabled, OS = 3.5V
DC
±26
±30
μA (max)
Internal Voltage Reference Characteristics
V
BANDGAP
Voltage Reference Output Voltage
1.23
V
V
REF LO
Negative Reference Output Voltage
V
REF MID
-1.0
V
V
REF MID
Midpoint Reference Output Voltage
V
A
/2.0
V
V
REF HI
Positive Reference Output Voltage
V
REF MID
+1.0
V
V
REGULA-
TOR
USB I/O Voltage Regulator
3.4
V
DC and Logic Electrical Characteristics
The following specifications apply for AGND=DGND=0V, V
A
=V
D
=V
DRAM
=+5.0V
DC
unless otherwise noted,
f
CRYSTAL IN
= 48MHz.
Boldface limits apply for T
A
=T
J
=T
MIN
to T
MAX
A
=T
J
=25°C. (Notes 8, 9, & 10)
Symbol
Parameter
Conditions
Typical
(Note 9)
Limits
(Note 10)
Units
(Limits)
Digital Input Characteristics for D0-D15 (DRAM Interface)
V
IN(1)
Logical “1” Input Voltage
V
DRAM
=5.25V
V
DRAM
=3.6V
2.0
2.0
V (min)
V (min)
V
IN(0)
Logical “0” Input Voltage
V
DRAM
=4.75V
V
DRAM
=2.85V
0.8
0.8
V (max)
V (max)
I
IN
Input Leakage Current
±0.1
μA
C
IN
Input Capacitance
5
pF
Digital Input Characteristics for PAPER SENSE 1-2, MISC I/O 1-6, SDA, BUS POWER, CRYSTAL/EXT CLOCK, 24/48, RESET,
CMODE
V
IN(1)
Logical “1” Input Voltage
V
D
=5.25V
2.0
V (min)
V
IN(0)
Logical “0” Input Voltage
V
D
=4.75V
0.8
V (max)
I
IN
Input Leakage Current
±0.1
μA
C
IN
Input Capacitance
5
pF
Digital Input Characteristics for D+, D-
V
IN(1)
Logical “1” Input Voltage
V
D
=5.25V
2.0
V (min)
V
IN(0)
Logical “0” Input Voltage
V
D
=4.75V
0.8
V (max)
I
IN
Input Leakage Current
±0.1
μA
C
IN
Input Capacitance
5
pF
Electrical Characteristics
(Continued)
The following specifications apply for AGND=DGND=0V, V
A
=V
D
=V
DRAM
=+5.0V
DC
,
f
CRYSTAL IN
= 48MHz.
Boldface limits apply for T
A
=T
J
=T
MIN
to T
MAX
; all other limits T
A
=T
J
=25°C. (Notes 8, 9, & 10)
Symbol
Parameter
Conditions
Typical
(Note 9)
Limits
(Note 10)
Units
(Limits)
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