ADFS7124-8BBCPZ datasheet(26/93 Pages) AD

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Data Sheet

ADFS7124-8

TERMINOLOGY

analog.com

Rev. 0 | 26 of 93

AINP

AINP refers to the positive analog input.

AINM

AINM refers to the negative analog input.

Integral Nonlinearity (INL)

INL is the maximum deviation of any code from a straight line pass-

ing through the endpoints of the transfer function. The endpoints of

the transfer function are zero scale (not to be confused with bipolar

zero), a point 0.5 LSB below the first code transition (000 … 000

to 000 … 001), and full scale, a point 0.5 LSB above the last code

transition (111 … 110 to 111 … 111). The error is expressed in ppm

of the full-scale range.

Gain Error

Gain error is the deviation of the last code transition (111 … 110 to

111 … 111) from the ideal AINP voltage (AINM + VREF/gain − 3/2

LSBs). Gain error applies to both unipolar and bipolar analog input

ranges.

Gain error is a measure of the span error of the ADC. It includes

full-scale errors but not zero-scale errors. For unipolar input ranges,

it is defined as full-scale error minus unipolar offset error; whereas

for bipolar input ranges it is defined as full-scale error minus bipolar

zero error.

Offset Error

Offset error is the deviation of the first code transition from the ideal

AINP voltage (AINM + 0.5 LSB) when operating in the unipolar

mode.

In bipolar mode, offset error is the deviation of the midscale transi-

tion (0111 … 111 to 1000 … 000) from the ideal AINP voltage

(AINM − 0.5 LSB).

Offset Calibration Range

In the system calibration modes, the ADFS7124-8 calibrates offset

with respect to the analog input. The offset calibration range spec-

ification defines the range of voltages that the ADFS7124-8 can

accept and still calibrate offset accurately.

Full-Scale Calibration Range

The full-scale calibration range is the range of voltages that the

ADFS7124-8 can accept in the system calibration mode and still

calibrate full scale correctly.

Input Span

In system calibration schemes, two voltages applied in sequence to

the ADFS7124-8 analog input define the analog input range. The

input span specification defines the minimum and maximum input

voltages from zero to full scale that the ADFS7124-8 can accept

and still calibrate gain accurately.

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