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LM9822CCWM Datasheet(PDF) 7 Page - Texas Instruments |
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LM9822CCWM Datasheet(HTML) 7 Page - Texas Instruments |
7 / 25 page 6 www.national.com 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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