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AD9826KRSZRL Arkusz danych(PDF) 6 Page - Analog Devices |
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AD9826KRSZRL Arkusz danych(HTML) 6 Page - Analog Devices |
6 / 20 page AD9826 –6– DEFINITIONS OF SPECIFICATIONS INTEGRAL NONLINEARITY (INL) Integral nonlinearity error refers to the deviation of each individual code from a line drawn from “zero scale” through “positive full scale.” The point used as “zero scale” occurs 1/2 LSB before the first code transition. “Positive full scale” is defined as a level 1 1/2 LSB beyond the last code transition. The deviation is measured from the middle of each particular code to the true straight line. DIFFERENTIAL NONLINEARITY (DNL) An ideal ADC exhibits code transitions that are exactly 1 LSB apart. DNL is the deviation from this ideal value. Thus every code must have a finite width. No missing codes guaranteed to 16-bit resolution indicates that all 65536 codes, respec- tively, must be present over all operating ranges. OFFSET ERROR The first ADC code transition should occur at a level 1/2 LSB above the nominal zero scale voltage. The offset error is the deviation of the actual first code transition level from the ideal level. GAIN ERROR The last code transition should occur for an analog value 1 1/2 LSB below the nominal full scale voltage. Gain error is the deviation of the actual difference between first and last code transitions and the ideal difference between the first and last code transitions. INPUT REFERRED NOISE The rms output noise is measured using histogram techniques. The ADC output codes’ standard deviation is calculated in LSB, and can be converted to an equivalent voltage, using the relationship 1 LSB = 4 V/65536 = 61 μV. The noise may then be referred to the input of the AD9826 by dividing by the PGA gain. CHANNEL-TO-CHANNEL CROSSTALK In an ideal 3-channel system, the signal in one channel will not influence the signal level of another channel. The channel-to- channel crosstalk specification is a measure of the change that occurs in one channel as the other two channels are varied. In the AD9826, one channel is grounded and the other two chan- nels are exercised with full scale input signals. The change in the output codes from the first channel is measured and compared with the result when all three channels are grounded. The differ- ence is the channel-to-channel crosstalk, stated in LSB. APERTURE DELAY The aperture delay is the time delay that occurs from when a sampling edge is applied to the AD9826 until the actual sample of the input signal is held. Both CDSCLK1 and CDSCLK2 sample the input signal during the transition from high to low, so the aperture delay is measured from each clock’s falling edge to the instant the actual internal sample is taken. POWER SUPPLY REJECTION Power supply rejection specifies the maximum full-scale change that occurs from the initial value when the supplies are varied over the specified limits. REV. B |
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