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AD12400JWS Datenblatt(PDF) 11 Page - Analog Devices |
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AD12400JWS Datenblatt(HTML) 11 Page - Analog Devices |
11 / 28 page AD12400 Rev. 0 | Page 11 of 28 DEFINITIONS OF SPECIFICATIONS Analog Bandwidth The analog input frequency at which the spectral power of the fundamental frequency (as determined by the FFT analysis) is reduced by 3 dB. Aperture Delay The delay between the 50% point on the rising edge of the ENCODE command and the instant at which the analog input is sampled. Aperture Uncertainty (Jitter) The sample-to-sample variation in aperture delay. Full-Scale Input Voltage Range This is the maximum peak-to-peak input signal magnitude that will result in a full-scale response, 0 dBFS on a single-tone input signal case. Any magnitude increase from this value will result in an over-range condition. Analog Input VSWR (50 Ω) The Voltage Standing Wave Ratio is a ratio of the transmitted and reflected signals. The VSWR can be related to input impedance using the following equations: Impedance Reference Impedance Load Actual 1 1 = = Γ + Γ − = + − = Γ S Z L Z VSWR S Z L Z S Z L Z Differential Nonlinearity The deviation of any code width from an ideal 1 LSB step. Effective Number of Bits (ENOB) Calculated from the measured SNR based on the equation 02 . 6 76 . 1 dB SNR ENOB MEASURED − = Encode Pulsewidth/Duty Cycle Pulsewidth high is the minimum amount of time the ENCODE pulse should be left in Logic 1 state to achieve rated perform- ance; pulsewidth low is the minimum time the ENCODE pulse should be left in low state. See timing implications of changing tENCH in the Application Notes, Encode Input section. At a specified clock rate of 400 MSPS, these specifications define an acceptable ENCODE duty cycle. Full-Scale Input Power Expressed in dBm. Computed using the following equation: () ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ = − − 001 . 0 log 10 2 INPUT SCALErms FULL SCALE FULL Z V POWER Gain Error The difference between the measured and ideal full-scale input voltage range of the ADC. Harmonic Distortion, Second The ratio of the RMS signal amplitude to the RMS value of the second harmonic component, reported in dBFS. Harmonic Distortion, Third The ratio of the RMS signal amplitude to the RMS value of the third harmonic component, reported in dBFS. Distortion, Image Spur The ratio of the RMS signal amplitude to the RMS signal amplitude of the image spur, reported in dBFS. The image spur, a result of gain and phase errors between two time-interleaved conversion channels, is located at fs/2 – fAIN. Distortion, Offset Spur The ratio of the RMS signal amplitude to the RMS signal amplitude of the offset spur, reported in dBFS. The offset spur, a result of offset errors between two time-interleaved conversion channels, is located at fs/2. Integral Nonlinearity The deviation of the transfer function from a reference line measured in fractions of 1 LSB using a “best straight line” determined by a least square curve fit. Minimum Conversion Rate The minimum ENCODE rate at which the image spur calibration will degrade no more than 1 dB (when image spur is 70 dB). Maximum Conversion Rate The maximum ENCODE rate at which the image spur calibration will degrade no more than 1 dB (when image spur is 70 dB). Output Propagation Delay The delay between a differential crossing of ENCODE and ENCODE (or zero crossing of a single-ended ENCODE). Total Noise Calculated as follows: ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − − × × = 10 10 001 . 0 dBFS dBc dBm SIGNAL SNR FS NOISE Z V where Z is the input impedance, FS is the full scale of the device for the frequency in question, SNR is the value of the particular input level, and SIGNAL is the signal level within the ADC reported in dB below full scale. This value includes both thermal and quantization noise. |
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