AD80066 데이터 시트보기 (PDF) - Analog Devices

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AD80066

Complete 16-Bit CCD/CIS Signal Processor

Analog Devices 

AD80066

TERMINOLOGY

Integral Nonlinearity (INL)

Integral nonlinearity error refers to the deviation of each

individual code from a line drawn from zero scale through

positive full scale. The point used as zero scale occurs ½ LSB

before the first code transition. Positive full scale is defined as a

level 1½ LSB beyond the last code transition. The deviation is

measured from the middle of each particular code to the true

straight line.

Differential Nonlinearity (DNL)

An ideal ADC exhibits code transitions that are exactly 1 LSB

apart. DNL is the deviation from this ideal value; therefore, every

code must have a finite width. No missing codes guaranteed to

16-bit resolution indicates that all 65,536 codes must be present

over all operating ranges.

Offset Error

The first ADC code transition should occur at a level ½ LSB above

the nominal zero-scale voltage. The offset error is the deviation

of the actual first code transition level from the ideal level.

Gain Error

The last code transition should occur for an analog value

1½ LSB below the nominal full-scale voltage. Gain error is the

deviation of the actual difference between the first and last code

transitions and the ideal difference between the first and last

code transitions.

Data Sheet

Input-Referred Noise

The rms output noise is measured using histogram techniques. The

standard deviation of the ADC output codes is calculated in LSB

and converted to an equivalent voltage, using the relationship

1 LSB = 1.5 V/65,536 = 23 µV. The noise is then referred to the

input of the AD80066 by dividing by the PGA gain.

Channel-to-Channel Crosstalk

In an ideal 3-channel system, the signal in one channel does not

influence the signal level of another channel. The channel-to-

channel crosstalk specification is a measure of the change that

occurs in one channel as the other two channels are varied. In

the AD80066, one channel is grounded and the other two channels

are exercised with full-scale input signals. The change in the output

codes from the first channel is measured and compared with the

result when all three channels are grounded. The difference is

the channel-to-channel crosstalk, stated in LSB.

Aperture Delay

The aperture delay is the delay that occurs from when a sampling

edge is applied to the AD80066 until the actual sample of the

input signal is held. Both CDSCLK1 and CDSCLK2 sample the

input signal during the transition from high to low; therefore,

the aperture delay is measured from each falling edge of the

clock to when the internal sample is taken.

Power Supply Rejection

The power supply rejection specifies the maximum full-scale

change that occurs from the initial value when the supplies are

varied over the specified limits.

Rev. B | Page 12 of 20

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