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MAX11644 Datasheet(PDF) 19 Page - Maxim Integrated Products |
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MAX11644 Datasheet(HTML) 19 Page - Maxim Integrated Products |
19 / 21 page Signal-to-Noise Ratio 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, 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 harmonics. 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 VVVV V log =× +++ ⎛ ⎝ ⎜ ⎞ ⎠ ⎟ 20 2 2 3 2 4 2 5 2 1 ⎛⎛ ⎝ ⎜ ⎜ ⎞ ⎠ ⎟ ⎟ SINAD dB Signal Noise THD RMS RMS RMS () log =× + ⎡ ⎣ ⎢ 20 ⎤⎤ ⎦ ⎥ 2.7V to 3.6V and 4.5V to 5.5V, Low-Power, 1-/2-Channel, 2-Wire Serial, 12-Bit ADCs ______________________________________________________________________________________ 19 GND VLOGIC = 3V/5V 3V OR 5V SUPPLIES DGND 3V/5V GND *OPTIONAL 4.7 µF R* = 5 Ω 0.1 µF VDD DIGITAL CIRCUITRY MAX11644 MAX11645 Figure 14. Power-Supply Grounding Connection |
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