MAX11901 datasheet(27/29 Pages) MAXIM

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Definitions

Integral Nonlinearity

Integral nonlinearity (INL) is the deviation of the values on

an actual transfer function from a straight line. For these

devices, this straight line is a line drawn between the end

points of the transfer function, once offset and gain errors

have been nullified.

Differential Nonlinearity

Differential nonlinearity (DNL) is the difference between

an actual step width and the ideal value of 1 LSB. For

these devices, the DNL of each digital output code is

measured and the worst-case value is reported in the

Electrical Characteristics table. A DNL error specification

of less than ±1 LSB guarantees no missing codes.

Offset Error

The offset error is defined as the deviation between the

actual output and ideal output measured with 0V differen-

tial analog input voltage.

Gain Error

Gain error is defined as the difference between the

actual output range measured and the ideal output range

expected. It is measured with signal applied at the input

with an amplitude close to full-scale range.

Signal-to-Noise Ratio

For a waveform perfectly reconstructed from digital

samples, signal-to-noise ratio (SNR) is the ratio of the full-

scale analog input power to the RMS quantization error

(residual error). The ideal, theoretical minimum analog-

to-digital noise is caused by quantization noise error only

and results directly from the ADC’s resolution (N bits):

SNR = (6.02 x N + 1.76)dB

In reality, there are other noise sources besides quantiza-

tion noise: thermal noise, reference noise, clock jitter, etc.

SNR is computed by taking the ratio of the signal power to

the noise power, which includes all spectral components

not including the fundamental, the first five harmonics,

and the DC offset.

Signal-to-Noise Plus Distortion

Signal-to-noise plus distortion (SINAD) is the ratio of the

fundamental input frequency’s power to the power of all

the other ADC output signals:

Signal

SINAD(dB) 10 LOG

(Noise Distortion







Effective Number of Bits

The effective number of bits (ENOB) indicates the global

accuracy of an ADC at a specific input frequency and

sampling rate. An ideal ADC’s error consists of quantiza-

tion noise only. With an input range equal to the full-scale

range of the ADC, calculate the ENOB as follows:

SINAD -1.76

ENOB

6.02

Total Harmonic Distortion

Total harmonic distortion (THD) is the ratio of the power

contained in the first five harmonics of the converted data

to the power of the fundamental. This is expressed as:

P2 P3 P4 P5

THD 10 log







where P1 is the fundamental power and P2 through P5 is

the power of the 2nd- through 5th-order harmonics.

Spurious-Free Dynamic Range

Spurious-free dynamic range (SFDR) is the ratio of the

power of the fundamental (maximum signal component)

to the power of the next-largest frequency component.

Aperture Delay

Aperture delay (tAD) is the time delay from the sampling

clock edge to the instant when an actual sample is taken.

Aperture Jitter

Aperture jitter (tAJ) is the sample-to-sample variation in

aperture delay.

Full-Power Bandwidth

A large -0.5dBFS analog input signal is applied to an

ADC, and the input frequency is swept up to the point

where the amplitude of the digitized conversion result

has decreased by 3dB. This point is defined as full-power

input bandwidth frequency.

www.maximintegrated.com

Maxim Integrated │ 27

MAX11901

16-Bit, 1.6Msps, Low-Power,

Fully Differential SAR ADC

MAX11901 Datasheet(PDF) 27 Page - Maxim Integrated Products

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