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AD7367 Datasheet(PDF) 9 Page  Analog Devices 

AD7367 Datasheet(HTML) 9 Page  Analog Devices 
9 / 16 page Preliminary Technical Data AD7367 Rev. PrD  Page 9 of 16 TERMINOLOGY Differential Nonlinearity Differential nonlinearity is the difference between the measured and the ideal 1 LSB change between any two adjacent codes in the ADC. Integral Nonlinearity Integral nonlinearity is the maximum deviation from a straight line passing through the endpoints of the ADC transfer function. The endpoints of the transfer function are zero scale, a single (1) LSB point below the first code transition and full scale, a point 1 LSB above the last code transition. Zero Code Error It is the deviation of the midscale transition (all 1s to all 0s) from the ideal VIN voltage, i.e., AGND – 1/2 LSB for bipolar ranges and 2×VREF−1LSB for the unipolar range. Positive Full Scale Error It is the deviation of the last code transition (011…110) to (011…111) from the ideal ( +4 × VREF  1 LSB or + 2 x VREF – 1 LSB) after the Zero Code Error has been adjusted out. Negative Full Scale Error This is the deviation of the first code transition (10…000) to (10…001) from the ideal (i.e.,  4 x VREF + 1 LSB,  2 x VREF + 1 LSB or AGND + 1LSB) after the Zero Code Error has been adjusted out. Zero Code Error Match This is the difference in zero code error across all 12 channels. Positive Full Scale Error Match This is the difference in positive full scale error across all channels. Negative Full Scale Error Match This is the difference in negative fullscale error across all channels. TrackandHold Acquisition Time The trackandhold amplifier returns to track mode at the end of conversion. Trackandhold acquisition time is the time required for the output of the trackandhold amplifier to reach its final value, within ±1/2 LSB, after the end of conversion. Signal to (Noise + Distortion) Ratio This ratio is the measured ratio of signal to (noise + distortion) at the output of the A/D converter. The signal is the rms amplitude of the fundamental. Noise is the sum of all non fundamental signals up to half the sampling frequency (fS/2), excluding dc. The ratio is dependent on the number of quantization levels in the digitization process; the more levels, the smaller the quantization noise. The theoretical signal to (noise + distortion) ratio for an ideal Nbit converter with a sine wave input is given by: Signal to (Noise + Distortion) = (6.02N + 1.76) dB Thus for a 12bit converter, this is 74 dB. Total Harmonic Distortion (THD) Total harmonic distortion is the ratio of the rms sum of harmonics to the fundamental. For the AD7367, it is defined as: 1 2 6 2 5 2 4 2 3 2 2 log 20 ) ( V V V V V V dB THD + + + + = where V1 is the rms amplitude of the fundamental and V2, V3, V4, V5 and V6 are the rms amplitudes of the second through the sixth harmonics. Peak Harmonic or Spurious Noise Peak harmonic, or spurious noise, is defined as the ratio of the rms value of the next largest component in the ADC output spectrum (up to fS/2, excluding dc) to the rms value of the fundamental. Normally, the value of this specification is determined by the largest harmonic in the spectrum, but for ADCs where the harmonics are buried in the noise floor, it is a noise peak. ChanneltoChannel Isolation Channeltochannel isolation is a measure of the level of crosstalk between any two channels when operating in the +/ 10 V Range. It is measured by applying a fullscale, 150 kHz sine wave signal to all unselected input channels and determining how much that signal is attenuated in the selected channel with a 50 kHz signal. The figure given is the worstcase across all four channels for the AD7367. See also Typical Performance Characteristics. Intermodulation Distortion With inputs consisting of sine waves at two frequencies, fa and fb, any active device with nonlinearities will create distortion products at sum, and difference frequencies of mfa ± nfb where m, n = 0, 1, 2, 3, and so on. Intermodulation distortion terms are those for which neither m nor n are equal to zero. For example, the second order terms include (fa + fb) and (fa − fb), while the third order terms include (2fa + fb), (2fa − fb), (fa + 2fb) and (fa − 2fb). The AD7367 is tested using the CCIF standard where two input frequencies near the top end of the input bandwidth are used. In this case, the second order terms are usually distanced in frequency from the original sine waves, while the third order terms are usually at a frequency close to the input frequencies. As a result, the second and third order terms are specified separately. The calculation of the intermodulation distortion is as per the THD specification, where it is the ratio of the rms sum of the individual distortion products to the rms amplitude of the sum of the fundamentals expressed in dBs. 
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