Rainbow-electronics MAX1421 Instrukcja Użytkownika Pobierz pdf (Strona 15)

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

SINADdB dB

176

602

MAX1421

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

with Internal Reference

______________________________________________________________________________________ 15

MAX1421

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

MAX1421

1nF

1kΩ100Ω

100Ω

22pF

CML

22pF

INP

INN

0.1µF

ISO

50Ω

ISO

50Ω

0.22µF

MAX4108

Figure 9. Single-Ended AC-Coupled Input Signal

HOLD

ANALOG

INPUT

SAMPLED

DATA (T/H)

T/H

TRACK TRACK

CLK

Figure 10. Track-and-Hold Aperture Timing

1 2 ... 10 11 12 13 14 15 16 17

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