Rainbow-electronics MAX1422 Bedienungsanleitung PDF herunterladen (Seite 14)

MAX1422

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

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.

THD

VVVV

=×

+++













log

12-Bit, 20Msps, +3.3V, Low-Power ADC with

Internal Reference

14 ______________________________________________________________________________________

MAX1422

1nF

1kΩ

100Ω

22pF

CML

22pF

INP

INN

0.1µF

ISO

50Ω

ISO

50Ω

0.22µF

MAX4108

Figure 9. Single-Ended AC-Coupled Input

MAX1422

N.C.

22pF

1nF

0.1µF

0.22µF

25Ω

MINICIRCUITS

T1–1T–KK81

INN

INP

CML

44pF

*REPLACE BOTH 22pF CAPS WITH 44pF BETWEEN

INP AND INN TO IMPROVE DYNAMIC PERFORMANCE.

Figure 8. Using a Transformer for AC-Coupling

HOLD

ANALOG

INPUT

SAMPLED

DATA (T/H)

T/H

TRACK TRACK

CLK

Figure 10. T/H Aperature Timing

CLK

INP

INTERFACE

PIPELINE ADC

OUTPUT

DRIVERS

REFIN REFP CML REFN OE

AGND

DGND

D11–D0

INN

T/H

MAX1422

BANDGAP

REFERENCE

CLK

REF SYSTEM +

BIAS

Functional Diagram

1 2 ... 9 10 11 12 13 14 15

Internal Reference 1

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