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AD7612 Datasheet(PDF) 16 Page  Analog Devices 

AD7612 Datasheet(HTML) 16 Page  Analog Devices 
16 / 32 page AD7612 Data Sheet Rev. A  Page 16 of 32 TERMINOLOGY Least Significant Bit (LSB) The least significant bit, or LSB, is the smallest increment that can be represented by a converter. For an analogtodigital con verter with N bits of resolution, the LSB expressed in volts is N INpp V V LSB 2 ) ( Integral Nonlinearity Error (INL) Linearity error refers to the deviation of each individual code from a line drawn from negative fullscale through positive full scale. The point used as negative fullscale occurs a ½ LSB before the first code transition. Positive fullscale is defined as a level 1½ LSBs beyond the last code transition. The deviation is meas ured from the middle of each code to the true straight line. Differential Nonlinearity Error (DNL) In an ideal ADC, code transitions are 1 LSB apart. Differential nonlinearity is the maximum deviation from this ideal value. It is often specified in terms of resolution for which no missing codes are guaranteed. Bipolar Zero Error The difference between the ideal midscale input voltage (0 V) and the actual voltage producing the midscale output code. Unipolar Offset Error The first transition should occur at a level ½ LSB above analog ground. The unipolar offset error is the deviation of the actual transition from that point. FullScale Error The last transition (from 111…10 to 111…11) should occur for an analog voltage 1½ LSB below the nominal fullscale. The full scale error is the deviation in LSB (or % of fullscale range) of the actual level of the last transition from the ideal level and includes the effect of the offset error. Closely related is the gain error (also in LSB or % of fullscale range), which does not include the effects of the offset error. Dynamic Range Dynamic range is the ratio of the rms value of the fullscale to the rms noise measured for an input typically at −60 dB. The value for dynamic range is expressed in decibels. SignaltoNoise Ratio (SNR) SNR is the ratio of the rms value of the actual input signal to the rms sum of all other spectral components below the Nyquist frequency, excluding harmonics and dc. The value for SNR is expressed in decibels. Total Harmonic Distortion (THD) THD is the ratio of the rms sum of the first five harmonic components to the rms value of a fullscale input signal and is expressed in decibels. Signalto(Noise + Distortion) Ratio (SINAD) SINAD is the ratio of the rms value of the actual input signal to the rms sum of all other spectral components below the Nyquist frequency, including harmonics but excluding dc. The value for SINAD is expressed in decibels. SpuriousFree Dynamic Range (SFDR) The difference, in decibels (dB), between the rms amplitude of the input signal and the peak spurious signal. Effective Number of Bits (ENOB) ENOB is a measurement of the resolution with a sine wave input. It is related to SINAD and is expressed in bits by ENOB = [(SINADdB − 1.76)/6.02] Aperture Delay Aperture delay is a measure of the acquisition performance measured from the falling edge of the CNVST input to when the input signal is held for a conversion. Transient Response The time required for the AD7612 to achieve its rated accuracy after a fullscale step function is applied to its input. Reference Voltage Temperature Coefficient Reference voltage temperature coefficient is derived from the typical shift of output voltage at 25°C on a sample of parts at the maximum and minimum reference output voltage (VREF) meas ured at TMIN, T(25°C), and TMAX. It is expressed in ppm/°C as 6 10 ) – ( ) C 25 ( ) ( – ) ( ) C ppm/ ( MIN MAX REF REF REF REF T T V Min V Max V TCV where: VREF (Max) = maximum VREF at TMIN, T(25°C), or TMAX. VREF (Min) = minimum VREF at TMIN, T(25°C), or TMAX. VREF (25°C) = VREF at 25°C. TMAX = +85°C. TMIN = –40°C. 
Similar Part No.  AD7612_15 

Similar Description  AD7612_15 


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