MAX1446 Datasheet, PDF(15/16 Page) Maxim Integrated Products – 10-Bit, 60Msps, 3.0V, Low-Power ADC with Internal Reference

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MAX1446 Datasheet, PDF (15/16 Pages) Maxim Integrated Products – 10-Bit, 60Msps, 3.0V, Low-Power ADC with Internal Reference

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10-Bit, 60Msps, 3.0V, Low-Power

ADC with Internal Reference

25â¦

22pF

0.1ÂµF

VIN

1 T1 6

N.C. 2

2.2ÂµF

MINICIRCUITS

TT1â6

25â¦

0.1ÂµF

22pF

IN+

MAX1446

COM

IN-

Figure 8. Using a Transformer for AC-Coupling

Differential Nonlinearity

Differential nonlinearity (DNL) 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

samples, the theoretical maximum SNR is the ratio of

the full-scale analog input (rms value) to the rms quanti-

zation error (residual error). The ideal, theoretical mini-

mum A/D noise is caused by quantization error only

and results directly from the ADCâs 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 sig-

nal to the rms noise, which includes all spectral compo-

nents 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 signal

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

ADCâs error consists of quantization noise only. ENOB

is computed from:

ENOB = (SINAD - 1.76dB) / 6.02dB

REFP

VIN

0.1ÂµF

RISP

MAX4108

100â¦

CIN

RISO = 50â¦

CIN = 22pF

100â¦

REFN

0.1ÂµF

RISO

CIN

Figure 9. Single-Ended AC-Coupled Input

IN+

MAX1446

COM

IN-

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