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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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ADS5240 Fiches technique(PDF) 12 Page - Burr-Brown (TI) |
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ADS5240 Fiches technique(HTML) 12 Page - Burr-Brown (TI) |
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12 / 24 page  www.ti.com DEFINITION OF SPECIFICATIONS ENOB + SINAD * 1.76 6.02 SINAD + 20Log(10) Input(V S ) Noise ) Harmonics ADS5240 SBAS326C – JUNE 2004 – REVISED DECEMBER 2004 Integral Nonlinearity (INL) Analog Bandwidth INL is the deviation of the transfer function from a The analog input frequency at which the spectral reference line measured in fractions of 1 LSB using a power of the fundamental frequency (as determined best straight line or best fit determined by a least by FFT analysis) is reduced by 3dB. square curve fit. INL is independent from effects of offset, gain or quantization errors. Aperture Delay Maximum Conversion Rate The delay in time between one of the edges of the input sampling clock and the actual time at which the The encode rate at which parametric testing is sampling occurs. performed. This is the maximum sampling rate where certified operation is given. Aperture Uncertainty (Jitter) Minimum Conversion Rate The sample-to-sample variation in aperture delay. This is the minimum sampling rate where the ADC Clock Pulse Width/Duty Cycle still works. Pulse width high is the minimum amount of time that Nyquist Sampling the ENCODE pulse should be left in logic '1' state to achieve rated performance. Pulse width low is the When the sampled frequencies of the analog input minimum time that the ENCODE pulse should be left signal are below fCLOCK/2, it is called Nyquist sam- in a low state (logic '0'). At a given clock rate, these pling. The Nyquist frequency is fCLOCK/2, which can specifications define an acceptable clock duty cycle. vary depending on the sample rate (fCLOCK). Differential Nonlinearity (DNL) Offset Error An ideal ADC exhibits code transitions that are Offset error is the deviation of output code from exactly 1 LSB apart. DNL is the deviation of any mid-code when both inputs are tied to com- single LSB transition at the digital output from an mon-mode. ideal 1 LSB step at the analog input. If a device claims to have no missing codes, it means that all Propagation Delay possible codes (for a 12-bit converter, 4096 codes) This is the delay between the input clock of one of are present over the full operating range. the edges and the time when all data bits are within Effective Number of Bits (ENOB) valid logic levels. The effective number of bits for a sine wave input at a Signal-to-Noise and Distortion (SINAD) given input frequency can be calculated directly from The RMS value of the sine wave fIN (input sine wave its measured SINAD using the following formula: for an ADC) to the RMS value of the noise of the converter from DC to the Nyquist frequency, including harmonic content. It is typically expressed in decibels (dB). SINAD includes harmonics, but excludes DC. If SINAD is not known, SNR can be used exception- ally to calculate ENOB (ENOBSNR). 12 |
Numéro de pièce similaire - ADS5240 |
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Description similaire - ADS5240 |
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