MAX107ECS+【PDF 11/21 页】IC ADC 6BIT 400MSPS DL 80-TQFP

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clock design limits aperture jitter to typically 1.5psRMS.

Figure 11 depicts the aperture jitter (tAJ), which is the

sample-to-sample variation in the aperture delay.

Aperture delay (tAD) is the time defined between the

rising edge of the sampling clock and the instant when

an actual sample is taken (Figure 11).

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 ADC’s reso-

lution (N-Bits):

SNRMAX[dB] = 6.02dB x N + 1.76dB

In reality, there are other noise sources besides quanti-

zation noise: thermal noise, reference noise, clock jitter

(see Aperture Uncertainties). SNR is computed by tak-

ing the ratio of the RMS signal to the RMS noise, which

includes all spectral components minus the fundamen-

tal, the first four 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, amplitude, and sampling

rate relative to an ideal ADC’s quantization noise. For a

full-scale input ENOB is computed from:

ENOB = (SINAD - 1.76dB) / 6.02dB

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 V1 is the fundamental amplitude, and V2 through

5 are the amplitudes of the 2nd- through 5th-order har-

monics.

Spurious-Free Dynamic Range (SFDR)

SFDR is the ratio expressed in decibels of the RMS

amplitude of the fundamental to the RMS value of the

next largest spurious component, excluding DC offset.

Two-Tone 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 -7dB full-scale and their envelope peaks at -1dB

full-scale.

Chip Information

TRANSISTOR COUNT: 12,286

THD

log (

) /

)

MAX107

Dual, 6-Bit, 400Msps ADC with On-Chip,

Wideband Input Amplifier

______________________________________________________________________________________

CLK+

ANALOG

INPUT

SAMPLING

INSTANT

tAW

tAD

tAJ

CLK-

tAW: APERTURE WIDTH

tAJ: APERTURE JITTER

tAD: APERTURE DELAY

Figure 11. Aperture Timing

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