LM9801 datasheet(7/34 Pages) NSC

7 / 34 page

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(IO) e 0V unless otherwise specified

Note 3

When the input voltage (VIN) at any pin exceeds the power supplies (VIN k GND or VIN l VA or VD) 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 TJmax iJA and the ambient temperature TA The maximum

allowable power dissipation at any temperature is PD e (TJmax–TA) iJA TJmax e 150 C for this device The typical thermal resistance (iJA) of this part when

board mounted is 52 CW for the V52A PLCC package and 70 CW for the VEG52A TQFP package

Note 5

Human body model 100 pF capacitor discharged through a 15 kX 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

TLH12814 – 4

Note 8

To guarantee accuracy it is required that VA and VD be connected together to the same power supply with separate bypass capacitors at each supply pin

Note 9

Typicals are at TJ e TA e 25 C fMCLK 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 VBLACK is defined as the CCD OS voltage for the reference period following the reset feedthrough pulse VWHITE is defined as the peak CCD

pixel output voltage for a white (full scale) image with respect to the reference level VBLACK -VRFT is defined as the peak positive deviation above VBLACK of the

reset feedthrough pulse For CIS VWHITE 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 VWHITE variation is defined as the maximum variation in VWHITE (due to PRNU light source intensity variation optics etc) that

the LM9801 can correct for using its internal PGA

CCD Output Signal

TLH12814 – 5

CIS Output Signal

TLH12814 – 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 119V may decrease SNR Reference voltages above 126V may cause clipping errors inside the LM9801 The

LM4041EIM3-12 (SOT-23 package) or the LM4041EIZ-12 (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

GainPGA

VVJ e1aCPGAcode

256

where C e (PGA RANGE b1)

256

255

and PGA RANGE e the PGA adjustment range (in VV) 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

GainVGA(dB) e C

VGA code

where C e (VGA RANGE)

and VGA RANGE e the VGA adjustment range (in dB) of the LM9801 under test

Typical Performance Characteristics

w1 w2 RS and TR Rise and Fall

Times Through a Series Resistance

vs Load Capacitance

TLH12814 – 8

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