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AD7740 Arkusz danych(PDF) 5 Page - Analog Devices |
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AD7740 Arkusz danych(HTML) 5 Page - Analog Devices |
5 / 11 page AD7740 REV. A –5– TERMINOLOGY INTEGRAL NONLINEARITY For the VFC, Integral Nonlinearity (INL) is a measure of the maxi- mum deviation from a straight line passing through the actual endpoints of the VFC transfer function. The error is expressed in % of the actual frequency span: Frequency Span = FOUT(max) – FOUT(min) OFFSET ERROR Ideally, the output frequency for 0 V input voltage is 10% of fCLKIN in unbuffered mode. The deviation from this value referred to the input is the offset error at BUF = 0. In buffered mode the minimum output frequency (corresponding to 0.10 V minimum input voltage) is 13.2% of fCLKIN at VREF = 2.5 V. The deviation from this value referred to the input is the offset error at BUF = 1. Offset error is expressed in mV. GAIN ERROR This is a measure of the span error of the VFC. The gain is the scale factor that relates the input VIN to the output FOUT. The gain error is the deviation in slope of the actual VFC transfer characteristic from the ideal expressed as a percentage of the full- scale span. See Figure 2. OFFSET ERROR DRIFT This is a measure of the change in Offset Error with changes in temperature. It is expressed in µV/°C. GAIN ERROR DRIFT This is a measure of the change in Gain Error with changes in temperature. It is expressed in (ppm of span)/ °C. POWER SUPPLY REJECTION RATIO (PSRR) This indicates how the apparent input voltage of the VFC is affected by changes in the supply voltage. The input voltage is kept constant at 2 V, VREF is 2.5 V and the VDD supply is varied 10% at 3.3 V and ±5% at 5 V. The ratio of the apparent change in input voltage to the change in VDD is measured in dBs. 0 REFIN WITH OFFSET ERROR ONLY IDEAL GAIN ERROR OUTPUT FREQUENCY FOUT 0.9 fCLKIN OFFSET ERROR WITH OFFSET ERROR AND GAIN ERROR INPUT VOLTAGE VIN 0.1 fCLKIN Figure 2. Offset and Gain |
Podobny numer części - AD7740_15 |
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Podobny opis - AD7740_15 |
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