Rainbow-electronics MAX1421 Bedienungsanleitung PDF herunterladen (Seite 14)

MAX1421

error specification of less than 1LSB guarantees no

missing codes.

Dynamic Parameter Definitions

Aperture Jitter

Figure 10 depicts the aperture jitter (t

), which is the

sample-to-sample variation in the aperture delay.

Aperture Delay

Aperture delay (t

) is the time defined between the

falling edge of the sampling clock and the instant when

an actual sample is taken (Figure 10).

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

quantization error (residual error). The ideal theoretical

minimum analog-to-digital noise is caused by quantiza-

tion error only and results directly from the ADCs reso-

lution (N-bits):

SNR

(MAX)

= (6.02

N + 1.76)dB

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 four

harmonics, and the DC offset.

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

with Internal Reference

14 ______________________________________________________________________________________

INPUT

300Ω

-5V

+5V

0.1µF

22pF

1nF0.22µF

44pF*

ISO

50Ω

ISO

50Ω

-5V

600Ω

300Ω

INP

INN

LOWPASS FILTER

CML

600Ω

+5V

-5V

0.1µF

300Ω

600Ω

300Ω

0.1µF

+5V

0.1µF

300Ω

MAX4108

MAX1421

MAX4108

LOWPASS FILTER

*TWO C

(22pF) CAPS MAY BE REPLACED BY

ONE 44pF CAP, TO IMPROVE PERFORMANCE.

22pF

Figure 7. Typical Application Circuit for Single-Ended to Differential Conversion

1 2 ... 9 10 11 12 13 14 15 16 17

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