Rainbow-electronics MAX1303 Manual de usuario descargar pdf (Pagina 29)

Effective Number of Bits (ENOB)

ENOB indicates the global accuracy of an ADC at a

specific input frequency and sampling rate. With an

input range equal to the ADC’s full-scale range, calcu-

late the ENOB as follows:

Total Harmonic Distortion (THD)

For the MAX1302/MAX1303, THD is the ratio of the

RMS sum of the input signal’s first four harmonic com-

ponents to the fundamental itself. This is expressed as:

where V

is the fundamental amplitude, and V

through

are the amplitudes of the 2nd- through 5th-order

harmonic components.

Spurious-Free Dynamic Range (SFDR)

SFDR is the ratio of RMS amplitude of the fundamental

(maximum signal component) to the RMS value of the

next-largest spectral component.

THD

VVVV

log

=×

+++













ENOB

SINAD













− 176

602

MAX1302/MAX1303

8-/4-Channel, ±V

REF

Multirange Inputs,

Serial 16-Bit ADCs

______________________________________________________________________________________ 29

INTCLK

(MODE 2)

ANALOG INPUT

TRACK AND HOLD

TRACK HOLD

SAMPLE INSTANT

SCLK

(MODE 0)

SCLK

(MODE 1)

Figure 21. Aperture Diagram

1 2 ... 24 25 26 27 28 29 30 31

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Rainbow-electronics MAX1303 Manual de usuario Pagina 29

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