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AD9948KCPRL Datenblatt(PDF) 6 Page - Analog Devices |
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AD9948KCPRL Datenblatt(HTML) 6 Page - Analog Devices |
6 / 28 page REV. 0 –6– AD9948 EQUIVALENT CIRCUITS R AVDD AVSS AVSS Circuit 1. CCDIN (Pin 27) AVDD AVSS 330 CLI 25k 1.4V Circuit 2. CLI (Pin 25) DVSS DRVDD DVSS DRVSS DATA THREE- STATE DOUT Circuit 3. Data Outputs D0–D9 (Pins 2–4, 7–13) DVDD DVSS 330 Circuit 4. Digital Inputs (Pins 31–35, 38) HVDD or RGVDD HVSS or RGVSS DATA ENABLE OUTPUT Circuit 5. H1–H4 and RG (Pins 14, 15, 18, 19, 21) TERMINOLOGY Differential Nonlinearity (DNL) An ideal ADC exhibits code transitions that are exactly 1 LSB apart. DNL is the deviation from this ideal value. Thus every code must have a finite width. No missing codes guaranteed to 10-bit resolution indicates that all 1024 codes, respectively, must be present over all operating conditions. Peak Nonlinearity Peak nonlinearity, a full signal chain specification, refers to the peak deviation of the output of the AD9948 from a true straight line. The point used as zero scale occurs 0.5 LSB before the first code transition. Positive full scale is defined as a level 1 LSB and 0.5 LSB beyond the last code transition. The deviation is measured from the middle of each particular output code to the true straight line. The error is then expressed as a percentage of the 2 V ADC full-scale signal. The input signal is always appro- priately gained up to fill the ADC’s full-scale range. Total Output Noise The rms output noise is measured using histogram techniques. The standard deviation of the ADC output codes is calculated in LSB, and represents the rms noise level of the total signal chain at the specified gain setting. The output noise can be converted to an equivalent voltage, using the relationship 12 n LSB (ADC full scale/ codes) = where n is the bit resolution of the ADC. For the AD9948, 1LSB is approximately 1.95 mV. Power Supply Rejection (PSR) The PSR is measured with a step change applied to the supply pins. The PSR specification is calculated from the change in the data outputs for a given step change in the supply voltage. |
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