Rainbow-electronics MAX1421 Manual de usuario descargar pdf (Pagina 16)

MAX1421

Total Harmonic Distortion (THD)

THD is typically the ratio of the RMS sum of the first four

harmonics of the input signal 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 har-

monics.

Spurious-Free Dynamic Range (SFDR)

SFDR is the ratio expressed in decibels of the RMS

amplitude of the fundamental (maximum signal compo-

nent) to the RMS value of the next largest spurious

component, excluding DC offset.

Intermodulation Distortion (IMD)

The two-tone IMD is the ratio expressed in decibels of

either input tone to the worst 3rd-order (or higher) inter-

modulation products. The individual input tone levels

are at -6.5dB full scale and their envelope is at -0.5dB

full scale.

THD

VVVV

=×

+++

()













log

12-Bit, 40Msps, +3.3V, Low-Power ADC

with Internal Reference

16 ______________________________________________________________________________________

CLK

INP

INTERFACE

PIPELINE ADC

OUTPUT

DRIVERS

REFIN REFP CML REFN OE

AGND

DGND

D11–D0

INN

T/H

MAX1421

BANDGAP

REFERENCE

CLK

REF SYSTEM +

BIAS

Functional Diagram

1 2 ... 11 12 13 14 15 16 17

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Rainbow-electronics MAX1421 Manual de usuario Pagina 16

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