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AD9862PCB Datasheet(PDF) 8 Page - Analog Devices |
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AD9862PCB Datasheet(HTML) 8 Page - Analog Devices |
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8 / 32 page  REV. 0 –8– AD9860/AD9862 DEFINITIONS OF SPECIFICATIONS Differential Nonlinearity Error (DNL, No Missing Codes) An ideal converter exhibits code transitions that are exactly 1 LSB apart. DNL is the deviation from this ideal value. Guaranteed no missing codes to 10-bit resolution indicate that all 1024 codes respectively, must be present over all operating ranges. Integral Nonlinearity Error (INL) Linearity error refers to the deviation of each individual code from a line drawn from “negative full scale” through “positive full scale.” The point used as “negative full 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. Phase Noise Single-sideband phase noise power is specified relative to the carrier (dBc/Hz) at a given frequency offset (1 kHz) from the carrier. Phase noise can be measured directly in Single Tone Trans- mit Mode with a spectrum analyzer that supports noise marker measurements. It detects the relative power between the carrier and the offset (1 kHz) sideband noise and takes the resolution bandwidth (rbw) into account by subtracting 10 log(rbw). It also adds a correction factor that compensates for the implementation of the resolution bandwidth, log display, and detector characteristic. Output Compliance Range The range of allowable voltage at the output of a current-output DAC. Operation beyond the maximum compliance limits may cause either output stage saturation or breakdown, resulting in nonlinear performance. Spurious-Free Dynamic Range (SFDR) The difference, in dB, between the rms amplitude of the DAC’s output signal (or ADC’s input signal) and the peak spurious signal over the specified bandwidth (Nyquist bandwidth unless otherwise noted). Pipeline Delay (Latency) The number of clock cycles between conversion initiation and the associated output data being made available. Offset Error First transition should occur for an analog value 1/2 LSB above –full scale. Offset error is defined as the deviation of the actual transition from that point. Gain Error The first code transition should occur at an analog value 1/2 LSB above –full scale. The last transition should occur for an analog value 1 1/2 LSB below the nominal full scale. Gain error is the deviation of the actual difference between first and last code transitions and the ideal difference between first and last code transitions. Aperture Delay The aperture delay is a measure of the Sample-and-Hold Ampli- fier (SHA) performance and specifies the time delay between the rising edge of the sampling clock input to when the input signal is held for conversion. Aperture Uncertainty (Jitter) Aperture jitter is the variation in aperture delay for successive samples and is manifested as noise on the input to the ADC. Input Referred Noise The rms output noise is measured using histogram techniques. The ADC output code’s standard deviation is calculated in LSB and converted to an equivalent voltage. This results in a noise figure that can be referred directly to the input of the AD9860/ AD9862. Signal-to-Noise and Distortion (S/N+D, SINAD) Ratio S/N+D is the ratio of the rms value of the measured input signal to the rms sum of all other spectral components below the Nyquist frequency, including harmonics but excluding dc. The value for S/N+D is expressed in decibels. Effective Number of Bits (ENOB) For a sine wave, SINAD can be expressed in terms of the number of bits. Using the following formula: N = () SINAD dB – . . 176 602 it is possible to get a measure of performance expressed as N, the effective number of bits. Thus, effective number of bits for a device for sine wave inputs at a given input frequency can be calculated directly from its measured SINAD. Signal-to-Noise Ratio (SNR) SNR is the ratio of the rms value of the measured 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 six harmonic components to the rms value of the measured input signal and is expressed as a percentage or in decibels. Power Supply Rejection Power supply rejection specifies the converter’s maximum full-scale change when the supplies are varied from nominal to minimum and maximum specified voltages. Channel-to-Channel Isolation (Crosstalk) In an ideal multichannel system, the signal in one channel will not influence the signal level of another channel. The channel- to-channel isolation specification is a measure of the change that occurs to a grounded channel as a full-scale signal is applied to another channel. |
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