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AD7339BS 数据表(PDF) 11 Page - Analog Devices |
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AD7339BS 数据表(HTML) 11 Page - Analog Devices |
11 / 12 page AD7339 –11– REV. 0 TERMINOLOGY Differential Nonlinearity The difference between the measured and the ideal 1 LSB change between any two adjacent codes in the ADC or DACs. A speci- fied Differential Nonlinearity of ±1 LSB max over the operating temperature range ensures monotonicity. Integral Nonlinearity The maximum deviation of any code from a straight line passing through the endpoints of the transfer function. The endpoints of the transfer function are zero scale, a point 0.5 LSB below the first code transition (000 . . . 00 to 000 . . . 01) and full scale, a point 0.5 LSB above the last code transition (111 . . . 10 to 111 . . . 11). The error is expressed in LSBs. Signal to (Noise + Distortion) Signal to (Noise + Distortion) is measured signal-to-noise at the output of the ADC. The signal is the rms magnitude of the fundamental. Noise is the rms sum of all nonfundamental sig- nals up to half the sampling frequency (FS/2) excluding dc. Signal to (Noise + Distortion) is dependent on the number of quantization levels used in the digitization process; the more levels, the smaller the quantization noise. The theoretical signal to (Noise + Distortion) ratio for a sine wave signal is given by Signal to (Noise + Distortion) = (6.02N + 1.76) dB where N is the number of bits. Thus for an ideal 8-bit converter, Signal to (Noise + Distortion) is 49.92 dB. ADC Effective Number of Bits (ENOB) Signal to (Noise + Distortion) is expressed in dBs; rewriting the Signal to (Noise + Distortion) formula, it is possible to get a measure of performance expressed in effective number of bits. The effective number of bits for a device can be calculated di- rectly from its measured Signal to (Noise + Distortion) value. ENOB = (SNR – 1.76)/6.02 where SNR is the Signal to (Noise + Distortion). Zero Input Offset Error This is the offset error in the ADC when the analog input is zero. Ideally, the digital output should equal 100 . . . 00. The offset error is the deviation from the ideal output code. The offset error is expressed in LSBs. Intermodulation Distortion With inputs consisting of sine waves at two frequencies, fa and fb, any active device with nonlinearities will create distortion products, of order (m + n), at sum and difference frequencies of mfa ± nfb, where m, n = 0, 1, 2, 3, . . .. Intermodulation terms are those for which m or n is not equal to zero. For the AD7339, the Intermodulation Distortion is the level to which the second and third intermodulation terms are suppressed below a full scale output signal level, the second order terms being (fa + fb) and (fa – fb) while the third order terms are (2fa + fb), (2fa – fb), (fa + 2fb) and (fa – 2fb). Error Rate The rate at which A-to-D conversion errors occur. DACS Bipolar Zero Offset Error The deviation between the measured output voltage and the bias voltage (VREFA or VREFB, depending on which DAC is being tested) when the DAC is loaded with code 100 . . . 00 after gain error has been adjusted out. Gain Error 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. Update Rate The rate at which the DACs can be loaded with new data. The parallel DACs have an update rate of 2.304 MHz while the serial DACs have an update rate of 256/10 kHz maximum. Gain Matching Between DACs The matching between the analog output amplitudes of the parallel DACs when the same digital word is written to each DAC. Crosstalk The ratio of the amplitude of a full-scale signal appearing on one channel to the amplitude of the same signal which couples onto another channel. Crosstalk is expressed in dBs. Output Harmonic Content When the digital word is converted to analog form, harmonics will also be generated. The Output Harmonic Content specifies the amount by which these harmonics are attenuated relative to the fundamental frequency. With the parallel DACs, a full sine wave of frequency 0 kHz to 128 kHz is input. The resulting analog output is evaluated and the amount by which the harmonics in the frequency band 0 MHz to 1.1152 MHz are attenuated is measured relative to the magnitude of the fun- damental output signal. |
类似零件编号 - AD7339BS |
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类似说明 - AD7339BS |
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