MAX11647EUA+T【PDF 13/22 页】IC ADC 10BIT I2C 94.4KSPS 8UMAX

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MAX11646/MAX11647

Low-Power, 1-/2-Channel, I2C, 10-Bit ADCs

in Ultra-Tiny 1.9mm x 2.2mm Package

______________________________________________________________________________________

Differential Nonlinearity

Differential nonlinearity (DNL) is the difference between

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

DNL error specification of less than 1 LSB guarantees

no missing codes and a monotonic transfer function.

Aperture Jitter

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

the time between the samples.

Aperture Delay

Aperture delay (tAD) is the time between the falling

edge of the sampling clock and the instant when an

actual sample is taken.

Signal-to-Noise Ratio

For a waveform perfectly reconstructed from digital sam-

ples, the theoretical maximum SNR is the ratio of the full-

scale analog input (RMS value) to the RMS quantization

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

log-to-digital noise is caused by quantization error only

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

SNRMAX[dB] = 6.02dB N + 1.76dB

In reality, there are other noise sources besides quanti-

zation noise: thermal noise, reference noise, clock jitter,

etc. SNR is computed by taking the ratio of the RMS

signal to the RMS noise, which includes all spectral

components minus the fundamental, the first five har-

monics, and the DC offset.

Signal-to-Noise Plus Distortion

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

fundamental input frequency’s RMS amplitude to RMS

equivalent of all other ADC output signals.

SINAD (dB) = 20 log (SignalRMS/NoiseRMS)

Effective Number of Bits

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 quanti-

zation noise only. With an input range equal to the

ADC’s full-scale range, calculate the ENOB as follows:

ENOB = (SINAD - 1.76)/6.02

Total Harmonic Distortion

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

sum of the input signal’s first five harmonics to the fun-

damental itself. This is expressed as:

where V1 is the fundamental amplitude, and V2 through V5

are the amplitudes of the 2nd through 5th order harmonics.

Spurious-Free Dynamic Range

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

amplitude of the fundamental (maximum signal compo-

nent) to the RMS value of the next largest distortion

component.

THD

VVVV

=×

+++

log

SINAD dB

SignalRMS

NoiseRMS THDRMS

(

)

log

=×

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