Rainbow-electronics MAX1444 Manual de usuario descargar pdf (Pagina 16)

MAX1444

10-Bit, 40Msps, +3.0V, Low-Power

ADC with Internal Reference

16 ______________________________________________________________________________________

Signal-to-Noise Plus Distortion (SINAD)

SINAD is computed by taking the ratio of the RMS sig-

nal to all spectral components minus the fundamental

and the DC offset.

Effective Number of Bits (ENOB)

ENOB specifies the dynamic performance of an ADC at

a specific input frequency and sampling rate. An ideal

ADC’s error consists of quantization noise only. ENOB

is computed from:

ENOB = (SINAD - 1.76dB) / 6.02dB

Total Harmonic Distortion (THD)

THD is typically the ratio of the RMS sum of the input

signal’s first five harmonics 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

harmonics.

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.

___________________Chip Information

TRANSISTOR COUNT: 5684

PROCESS: CMOS

HOLD

ANALOG

INPUT

SAMPLED

DATA (T/H)

T/H

TRACK TRACK

CLK

Figure 10. T/H Aperture Timing

THD VVVVV=× +++

()

log /

1 2 ... 11 12 13 14 15 16 17 18

ADC with Internal Reference 1

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