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AD7356YRUZ-RL Datasheet(PDF) 9 Page - Analog Devices |
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AD7356YRUZ-RL Datasheet(HTML) 9 Page - Analog Devices |
9 / 18 page Preliminary Technical Data AD7356 Rev. PrC | Page 9 of 18 TERMINOLOGY Integral Nonlinearity (INL) 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, 1 LSB below the first code transition, and full scale, 1 LSB above the last code transition. Differential Nonlinearity (DNL) The difference between the measured and the ideal 1 LSB change between any two adjacent codes in the ADC. Offset Error The deviation of the first code transition (00 . . .000) to (00 . . . 001) from the ideal (that is, AGND + 1 LSB). Offset Error Match This is the difference in offset error between the two ADCs. Gain Error The deviation of the last code transition (111 . . .110) to (111 . . . 111) from the ideal (that is, VREF – 1 LSB) after the offset error has been adjusted out. Gain Error Match The difference in gain error between the two ADCs. Channel-to-Channel Isolation Channel-to-channel isolation is a measure of the level of crosstalk between channels. It is measured by applying a full- scale sine wave signal to one of the two channels and applying a 50 kHz signal to the other channel. The channel-to-channel isolation is defined as the ratio of the power of the 50 kHz signal on the converted channel to the power of the noise signal on the other channel that appears in the FFT of this channel. The noise frequency on the unselected channel varies from 40 kHz to 740 kHz. The noise amplitude is at 2 × VREF, while the signal amplitude is at 1 × VREF. See Figure 6. Power Supply Rejection Ratio (PSRR) PSRR is defined as the ratio of the power in the ADC output at full-scale frequency, f, to the power of a 100 mV p-p sine wave applied to the ADC VDD supply of frequency fS. The frequency of the input varies from 1 kHz to 1 MHz. PSRR (dB) = 10log(Pf/PfS) where: Pf is the power at frequency f in the ADC output. PfS is the power at frequency fS in the ADC output. Common-Mode Rejection Ratio (CMRR) CMRR is defined as the ratio of the power in the ADC output at full-scale frequency, f, to the power of a 100 mV p-p sine wave applied to the common-mode voltage of VIN+ and VIN− of frequency fS as CMRR (dB) = 10log (Pf/PfS) where: Pf is the power at frequency f in the ADC output. PfS is the power at frequency fS in the ADC output. Track-and-Hold Acquisition Time The track-and-hold amplifier returns to track mode at the end of conversion. The track-and-hold acquisition time is the time required for the output of the track-and-hold amplifier to reach its final value, within ±1/2 LSB, after the end of conversion. Signal-to-(Noise + Distortion) Ratio (SINAD) This is the measured ratio of signal-to-noise and distortion at the output of the ADC. The signal is the rms amplitude of the fundamental. Noise is the sum of all nonfundamental 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 and distortion ratio for an ideal N-bit converter with a sine wave input is given by SINAD = (6.02 N + 1.76) dB Thus, for a 12-bit converter, this is 74 dB and for a 14 bit converter, this is 86dB. Total Harmonic Distortion (THD) THD is the ratio of the rms sum of harmonics to the fundamental. For the AD7356, it is defined as () 1 6 5 4 3 2 V V V V V V THD 2 2 2 2 2 20log dB + + + + − = where: V1 is the rms amplitude of the fundamental. V2, V3, V4, V5, and V6 are the rms amplitudes of the second through the sixth harmonics. |
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