LM9822 datasheet(6/22 Pages) NSC

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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

----





PGA code

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