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LM9822 bảng dữ liệu(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện LM9822
Giải thích chi tiết về linh kiện  LM9822 3 Channel 42-Bit Color Scanner Analog Front End
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM9822 bảng dữ liệu(HTML) 6 Page - National Semiconductor (TI)

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Electrical Characteristics (Continued)
Note 9: Typicals are at TJ=TA=25°C, f MCLK = 12MHz, and represent most likely parametric norm.
Note 10: Tested limits are guaranteed to National's AOQL (Average Outgoing Quality Level).
Note 11: Full channel integral non-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 AFE.
Note 12: The sensor’s maximum peak differential signal range is defined as the peak sensor output voltage for a white (full scale) image, with respect to the dark reference
level.
Note 13: PGA Gain Error is the maximum difference between the measured gain for any PGA code and the ideal gain calculated using:
where
.
Note 14: Full Channel INL and DNL are tested with CDS disabled, negative signal polarity, DOE = 0, and a single OS input with a gain register setting of 1 (000001b) and
an offset register setting of 0 (000000b).
Note 15: The digital supply current (ID) does not include the load, data and switching frequency dependent current required to drive the digital output bus on pins (D7 - D0).
The current required to switch the digital data bus can be calculated from: Isw = 2*Nd*Psw*CL*VD/tMCLK where Nd is total number of data pins, Psw is the probability of
each data bit switching, CL is the capacitive loading on each data pin, V D is the digital supply voltage and t MCLK is the period of the MCLK input. For most applications, Nd
is 8, Psw is
≈ 0.5, and V
D is 5V,and the switching current can be calculated fr om: Isw = 40* CL/tMCLK. (With
D at 3.3V, the equation becomes: Isw = 26.4*CL/tMCLK.) For
example, if the capacitive load on each digital output pin (D7 - D0) is 20pF and the period of t MCLK is 1/12MHz or 83ns, then the digital switching current would be 9.6mA.
The calculated digital switching current will be drawn through the V D pin and should be considered as part of the total power budget for the LM9822.
Note 16: All specifications quoted in LSBs are based on 12 bit resolution.
VWHITE
VREF
VRFT
CCD Output Signal
CIS Output Signal
VWHIT
Black Level
Gain
PGA
V
V
----


G
0
X
PGA code
32
-----------------------------
+
=X
G
31
G
0
()32
31
------
=


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