Rainbow-electronics MAX109 Manual do Utilizador descarregar pdf (Página 27)

distortion includes all spectral components to the

Nyquist frequency excluding the fundamental and the

DC offset.

Effective Number of Bits (ENOB)

ENOB indicates the global accuracy of an ADC at a

specific input frequency and sampling rate. An ideal

ADC’s error consists of quantization noise only. ENOB

is calculated from a curve fit referenced to the theoreti-

cal full-scale range.

Total Harmonic Distortion (THD)

THD is the ratio of the RMS sum of the first 15 harmon-

ics of the input signal to the fundamental itself. This is

expressed as:

where V1 is the fundamental amplitude, and V

through

are the amplitudes of the 2nd- through 16th-order

harmonics (HD2 through HD16).

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.

Third-Order Intermodulation (IM3)

IM3 is the total power of the third-order intermodulation

product to the Nyquist frequency relative to the total

input power of the two input tones, f

1 and f

2. The

individual input tone levels are at -7dBFS. The third-order

intermodulation products are located at 2 x f

IN1

-f

IN2

, 2 x

IN2

-f

IN1

, 2 x f

IN1

IN2

, and 2 x f

IN2

IN1

Full-Power Bandwidth

A large -1dBFS analog input signal is applied to an

ADC and the input frequency is swept up to the point

where the amplitude of the digitized conversion result

has decreased by -3dB. This point is defined as full-

power input bandwidth frequency.

THD 20 log

=×

+++

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⎝

⎜

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⎟

... V

MAX109

8-Bit, 2.2Gsps ADC with Track/Hold Amplifier

and 1:4 Demultiplexed LVDS Outputs

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