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參數(shù)資料
| 型號： | LM9801 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Greyscale/24-Bit Color Linear CCD Sensor Processor |
| 中文描述： | Greyscale/24-Bit彩色線陣CCD傳感器處理器 |
| 文件頁數(shù)： | 7/34頁 |
| 文件大小： | 520K |
| 代理商： | LM9801 |
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Electrical Characteristics
(Continued)
Note 1:
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed
specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed lest
conditions.
Note 2:
All voltages are measured with respect to GND
e
AGND
e
DGND
e
DGND
(I/O)
e
0V, unless otherwise specified.
Note 3:
When the input voltage (V
IN
) at any pin exceeds the power supplies (V
IN
k
GND or V
IN
l
V
A
or V
D
), the current at that pin should be limited to 25 mA. The
50 mA maximum package input current rating limits the number of pins that can simultaneously safely exceed the power supplies with an input current of 25 mA to
two.
Note 4:
The maximum power dissipation must be derated at elevated temperatures and is dictated by T
Jmax
,
i
JA
and the ambient temperature, T
A
. The maximum
allowable power dissipation at any temperature is P
D
e
(T
Jmax
–T
A
)/
i
JA
. T
Jmax
e
150
§
C for this device. The typical thermal resistance (
i
JA
) of this part when
board mounted is 52
§
C/W for the V52A PLCC package, and 70
§
C/W for the VEG52A TQFP package.
Note 5:
Human body model, 100 pF capacitor discharged through a 1.5 k
X
resistor.
Note 6:
See AN450 ‘‘Surface Mounting Methods and Their Effect on Product Reliability’’ or the section titled ‘‘Surface Mount’’ found in any National Semiconductor
Linear Data Book for other methods of soldering surface mount devices.
Note 7:
A Zener diode clamps the OS analog input to AGND as shown below. This input protection, in combination with the external clamp capacitor and the output
impedance of the CCD, prevents damage to the LM9801 from transients during power-up.
TL/H/12814–4
Note 8:
To guarantee accuracy, it is required that V
A
and V
D
be connected together to the same power supply with separate bypass capacitors at each supply pin.
Note 9:
Typicals are at T
J
e
T
A
e
25
§
C, f
MCLK
e
20 MHz, and represent most likely parametric norm.
Note 10:
Tested limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 11:
For CCDs, V
BLACK
is defined as the CCD OS voltage for the reference period following the reset feedthrough pulse. V
WHITE
is defined as the peak CCD
pixel output voltage for a white (full scale) image with respect to the reference level, V
BLACK
- V
RFT
is defined as the peak positive deviation above V
BLACK
of the
reset feedthrough pulse. For CIS, V
WHITE
is defined as the peak CCD pixel output voltage for a white (full scale) image with respect to GND (0V). The maximum
correctable range of pixel-to-pixel V
WHITE
variation is defined as the maximum variation in V
WHITE
(due to PRNU, light source intensity variation, optics, etc.) that
the LM9801 can correct for using its internal PGA.
CCD Output Signal
TL/H/12814–5
CIS Output Signal
TL/H/12814–6
Note 12:
Integral linearity error is defined as the deviation of the analog value, expressed in LSBs, from the straight line that best fits the actual transfer function of
the ADC.
Note 13:
Reference voltages below 1.19V may decrease SNR. Reference voltages above 1.26V may cause clipping errors inside the LM9801. The
LM4041EIM3-1.2 (SOT-23 package) or the LM4041EIZ-1.2 (TO-92 package) bandgap voltage references are recommended for this application.
Note 14:
PGA Gain Error is the maximum difference between the measured gain for any PGA code and the ideal gain calculated by using the formula
V
e
1
a
CPG256
Gain
PGA
#
V
where C
e
(PGA RANGE
b
1)255and PGA RANGE
e
the PGA adjustment range (in V/V) of the LM9801 under test.
Note 15:
VGA Gain Error is the maximum difference between the measured gain for any VGA code and the ideal gain calculated by using the formula
Gain
VGA
(dB)
e
CVG16
Typical Performance Characteristics
where C
e
(VGA RANGE)16
15and VGA RANGE
e
the VGA adjustment range (in dB) of the LM9801 under test.
w
1,
w
2, RS, and TR Rise and Fall
Times Through a Series Resistance
vs Load Capacitance
TL/H/12814–8
http://www.national.com
7
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