MAX1449 查看數據表（PDF） - Maxim Integrated

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MAX1449

10-Bit, 105Msps, Single +3.3V, Low-Power ADC with Internal Reference

Maxim Integrated 

10-Bit, 105Msps, Single +3.3V, Low-Power

ADC with Internal Reference

25Ω

22pF

0.1µF

VIN

1 T1 6

N.C. 2

5

2.2µF

3

4

MINICIRCUITS

TT1–6

25Ω

0.1µF

22pF

IN+

MAX1449

COM

IN-

Figure 8. Using a Transformer for AC Coupling

Differential Nonlinearity (DNL)

Differential nonlinearity is the difference between an

actual step width and the ideal value of 1LSB. A DNL

error specification of less than 1LSB guarantees no

missing codes and a monotonic transfer function.

Dynamic Parameter Definitions

Aperture Jitter

Figure 10 depicts the aperture jitter (tAJ), which is the

sample-to-sample variation in the aperture delay.

Aperture Delay

Aperture delay (tAD) 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 sam-

ples, 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 ana-

log-to-digital noise is caused by quantization error only

and results directly from the ADC’s resolution (N Bits):

SNR(MAX) = (6.02 x N + 1.76)dB

In reality, there are other noise sources besides quanti-

zation noise: 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 spectral

components minus the fundamental, the first five har-

monics, 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:

( ) SINAD − 1.76

ENOB =

6.02

REFP

VIN

0.1µF

1k

RISO

MAX4108

100Ω

CIN

1k

RISO = 50Ω

CIN = 22pF

100Ω

REFN

0.1µF

RISO

CIN

IN+

MAX1449

COM

IN-

Figure 9. Single-Ended AC-Coupled Input

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