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AD7729ARZ Fiches technique(PDF) 8 Page - Analog Devices |
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AD7729ARZ Fiches technique(HTML) 8 Page - Analog Devices |
8 / 16 page AD7729 –8– REV. 0 TERMINOLOGY Absolute Group Delay Absolute group delay is the rate of change of phase versus fre- quency, dø/df. It is expressed in microseconds. Differential Nonlinearity This is the difference between the measured and the ideal 1 LSB change between any two adjacent codes in the DAC or ADC. Dynamic Range Dynamic Range is the ratio of the maximum output signal to the smallest output signal the converter can produce (1 LSB), ex- pressed logarithmically, in decibels (dB = 201og10 (ratio)). For an N-bit converter, the ratio is theoretically very nearly equal to 2 N (in dB, 20Nlog10(2) = 6.02N). However, this theoretical value is degraded by converter noise and inaccuracies in the LSB weight. Gain Error This is a measure of the output error between an ideal DAC and the actual device output with all 1s loaded after offset error has been adjusted out. In the AD7729, gain error is specified for the auxiliary section. Gain Matching Between Channels This is the gain matching between the IRx and QRx channel and is expressed in dBs. Group Delay Between Channels This is the difference between the group delay of the I and Q channels and is a measure of the phase matching characteristics of the two. Integral Nonlinearity This is the maximum deviation from a straight line passing through the endpoints of the auxiliary DAC transfer function. Output Rate This is the rate at which data words are made available (270.833 kHz). Offset Error This is the amount of offset, wrt VREF in the auxiliary DAC and is expressed in mVs. Output Signal Span This is the output signal range for the auxiliary DAC section. Sampling Rate This is the rate at which the modulators on the receive channels sample the analog input. Settling Time This is the digital filter settling time in the AD7729 receive section. On initial power-up or after returning from the power- down mode, it is necessary to wait this amount of time to get useful data. Signal Input Span The input signal range for the I and Q channels is biased about VREF. Signal to (Noise + Distortion) Ratio This is the measured ratio of signal to (noise + distortion) at the output of the receive channel. The signal is the rms amplitude of the fundamental. Noise is the rms sum of all nonfundamental signals up to half the sampling frequency (fS/2), excluding dc. The ratio is dependent upon the number of quantization levels in the digitization process; the more levels, the smaller the quan- tization noise. The theoretical signal to (noise + distortion) ratio for a sine wave is given by: Signal to (Noise + Distortion) = (6.02N + 1.76) dB |
Numéro de pièce similaire - AD7729ARZ |
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Description similaire - AD7729ARZ |
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