MAX1444(2003) 查看數據表（PDF） - Maxim Integrated

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MAX1444
(Rev.:2003)

10-Bit, 40Msps, 3.0V, Low-Power ADC with Internal Reference

Maxim Integrated 

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

ADC with Internal Reference

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 four harmonics to the fundamental itself.

This is expressed as:



THD = 20 × log 

V22

+

V32 +

V1

V42

+

V52





where V1 is the fundamental amplitude, and V2 through

V5 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.

Chip Information

TRANSISTOR COUNT: 5684

PROCESS: CMOS

CLK

IN+

T/H

IN-

PD

REF

CONTROL

ADC

REF SYSTEM +

BIAS

Functional Diagram

MAX1444

VDD

GND

D

E

C

10

OUTPUT

DRIVERS

D9–D0

OVDD

OGND

REFOUT REFIN REFP COM REFN

OE

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