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AD5533B Datenblatt(PDF) 9 Page - Analog Devices |
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AD5533B Datenblatt(HTML) 9 Page - Analog Devices |
9 / 16 page REV. A AD5533B –9– TERMINOLOGY VIN to VOUT Nonlinearity This is a measure of the maximum deviation from a straight line passing through the endpoints of the VIN versus VOUT transfer function. It is expressed as a percentage of the full-scale span. Total Unadjusted Error (TUE) This is a comprehensive specification that includes relative accu- racy, gain, and offset errors. It is measured by sampling a range of voltages on VIN and comparing the measured voltages on VOUT to the ideal value. It is expressed in mV. Offset Error This is a measure of the output error when VIN = 70 mV. Ideally, with VIN = 70 mV: VGain Gain V mV OUT OFFS IN =× − − × () (( ) ) _ 70 1 Offset error is a measure of the difference between VOUT (actual) and VOUT (ideal). It is expressed in mV and can be positive or negative. See Figure 5. Gain Error This is a measure of the span error of the analog channel. It is the deviation in slope of the transfer function. See Figure 5. It is calculated as: Gain Error Actual Full Scale Output Ideal Full Scale Output Offset Error =− − - - where Ideal Full Scale Output Gain Gain V OFFS IN - =× − − × (. ) (( ) ) _ 296 1 Ideal Gain = 3.52 Output Temperature Coefficient This is a measure of the change in analog output with changes in temperature. It is expressed in ppm/ °C. DC Power Supply Rejection Ratio DC Power Supply Rejection Ratio (PSRR) is a measure of the change in analog output for a change in supply voltage (VDD and VSS). It is expressed in dBs. VDD and VSS are varied ±5%. DC Crosstalk This is the dc change in the output level of one channel in response to a full-scale change in the output of all other channels. It is expressed in µV. Output Settling Time This is the time taken from when BUSY goes high to when the output has settled to ±0.018%. Acquisition Time This is the time taken for the VIN input to be acquired. It is the length of time that BUSY stays low. OFFS_IN Settling Time This is the time taken from a 0 V–3 V step change in input voltage on OFFS_IN until the output has settled to within ±0.39%. Digital Feedthrough This is a measure of the impulse injected into the analog outputs from the digital control inputs when the part is not being written to, i.e., CS/SYNC is high. It is specified in nV-secs and is measured with a worst-case change on the digital input pins, e.g., from all 0s to all 1s and vice versa. Output Noise Spectral Density This is a measure of internally generated random noise. Random noise is characterized as a spectral density (voltage per root Hertz). It is measured by acquiring 1.5 V on all channels and measuring noise at the output. It is measured in nV/ √Hz typ. AC Crosstalk This is the area of the glitch that occurs on the output of one chan- nel while another channel is acquiring. It is expressed in nV-secs. 2.96 3V 70mV 0V VOUT IDEAL TRANSFER FUNCTION ACTUAL TRANSFER FUNCTION OFFSET ERROR GAIN ERROR + OFFSET ERROR VIN UPPER DEAD BAND LOWER DEAD BAND Figure 5. ISHA Transfer Function |
Ähnliche Teilenummer - AD5533B_15 |
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Ähnliche Beschreibung - AD5533B_15 |
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