Rainbow-electronics MAX1182 Manual de usuario descargar pdf (Pagina 18)

MAX1182

Dual 10-Bit, 65Msps, +3V, Low-Power ADC with

Internal Reference and Parallel Outputs

18 ______________________________________________________________________________________

Signal-to-Noise Ratio (SNR)

For a waveform perfectly reconstructed from digital

samples, the theoretical maximum SNR is the ratio of the

full-scale analog input (RMS value) to the RMS quantiza-

tion error (residual error). The ideal, theoretical minimum

analog-to-digital noise is caused by quantization error

only and results directly from the ADC’s resolution

(N-Bits):

SNR

dB[max]

= 6.02

x N + 1.76

In reality, there are other noise sources besides quanti-

zation noise e.g. thermal noise, reference noise, clock

jitter, etc. SNR is computed by taking the ratio of the

RMS signal to the RMS noise, which includes all spec-

tral components minus the fundamental, the first five

harmonics, and the DC offset.

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

dB dB

−176

602

MAX1182

0.1µF

1kΩ

100Ω

22pF

INB+

INB-

COM

INA+

INA-

0.1µF

ISO

50Ω

ISO

50Ω

REFP

REFN

MAX4108

0.1µF

1kΩ

100Ω

22pF

0.1µF

ISO

50Ω

ISO

50Ω

REFP

REFN

MAX4108

Figure 7: Using an Op Amp for Single-Ended, AC-Coupled Input Drive

1 2 ... 13 14 15 16 17 18 19 20 21

Comentarios a estos manuales

Sin comentarios

Rainbow-electronics MAX1182 Manual de usuario Pagina 18

Comentarios a estos manuales

Relacionado con productos y manuales para Sensores Rainbow-electronics MAX1182