MAX11616EEE+T【PDF 14/24 页】IC ADC SERIAL 12BIT 12CH 16-QSOP

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MAX11612–MAX11617

Low-Power, 4-/8-/12-Channel, I2C,

12-Bit ADCs in Ultra-Small Packages

Maxim Integrated

Signal-to-Noise Ratio

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):

SNRMAX[dB] = 6.02dB N + 1.76dB

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

Signal-to-noise plus distortion (SINAD) is the ratio of the

fundamental input frequency’s RMS amplitude to the

RMS equivalent of all other ADC output signals.

Effective Number of Bits

Effective number of bits (ENOB) indicates the global

accuracy of an ADC at a specific input frequency and

sampling rate. An ideal ADC’s error consists of quanti-

zation noise only. With an input range equal to the

ADC’s full-scale range, calculate the ENOB as follows:

ENOB = (SINAD - 1.76)/6.02

Total Harmonic Distortion

Total harmonic distortion (THD) is the ratio of the RMS

sum of the input signal’s first five harmonics to the fun-

damental itself. This is expressed as:

where V1 is the fundamental amplitude, and V2 through

V5 are the amplitudes of the 2nd- through 5th-order har-

monics.

Spurious-Free Dynamic Range

Spurious-free dynamic range (SFDR) is the ratio of the

RMS amplitude of the fundamental (maximum signal

component) to the RMS value of the next largest distor-

tion component.

THD

VVV

log

=×

SINAD dB

SignalRMS

NoiseRMS THDRMS

(

)

log

=×

Chip Information

PROCESS: BiCMOS

MAX11612–MAX11617

PART

INPUT

CHANNELS

INTERNAL

REFERENCE

(V)

SUPPLY

VOLTAGE

(V)

INL

(LSB)

MAX11612

4.096

4.5 to 5.5

±1

MAX11613

2.048

2.7 to 3.6

±1

MAX11614

4.096

4.5 to 5.5

±1

MAX11615

2.048

2.7 to 3.6

±1

MAX11616

4.096

4.5 to 5.5

±1

MAX11617

2.048

2.7 to 3.6

±1

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