AD9923ABBCZ datasheet(12/88 Pages) AD

12 / 88 page

AD9923A

Rev. 0 | Page 12 of 88

TERMINOLOGY

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 12-bit resolution indicates that all 4096 codes, respectively,

must be present over all operating conditions.

Integral Nonlinearity (INL)

The deviation of each code measured from a true straight line

between the zero and full-scale values. The point used as zero

scale occurs 0.5 LSB before the first code transition. Positive full

scale is defined as a level 1.5 LSB beyond the last code transition.

The deviation is measured from the middle of each output code

to the true straight line.

Peak Nonlinearity

Peak nonlinearity, a full signal chain specification, refers to the

peak deviation of the AD9923A output from a true straight line.

The point used as zero scale occurs 0.5 LSB before the first code

transition. Positive full scale is defined as a level 1.5 LSB beyond

the last code transition. The deviation is measured from the

middle of each output code to the true straight line. The error is

expressed as a percentage of the 2 V ADC full-scale signal. The

input signal is always appropriately gained up to fill the full-scale

range of the ADC.

Total Output Noise

The rms output noise is measured using histogram techniques.

The standard deviation of the ADC output codes is calculated

in LSB, and represents the rms noise level of the total signal

chain at the specified gain setting. The output noise can be

converted to an equivalent voltage, using the relationship

1 LSB = (ADC full scale/2n codes)

where n is the bit resolution of the ADC and 1 LSB is 0.488 mV.

Power Supply Rejection (PSR)

The PSR is measured with a step change applied to the supply

pins. The PSR specification is calculated from the change in the

data outputs for a given step change in the supply voltage.

AD9923ABBCZ 数据表(PDF) 12 Page - Analog Devices

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