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AD5532-2 Datasheet(PDF) 9 Page - Analog Devices |
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AD5532-2 Datasheet(HTML) 9 Page - Analog Devices |
9 / 16 page REV. 0 AD5532 –9– TERMINOLOGY DAC MODE Integral Nonlinearity (INL) This is a measure of the maximum deviation from a straight line passing through the endpoints of the DAC transfer function. It is expressed as a percentage of full-scale span. Differential Nonlinearity (DNL) Differential Nonlinearity (DNL) is the difference between the measured change and the ideal 1 LSB change between any two adjacent codes. A specified DNL of ±1 LSB maximum ensures monotonicity. Offset Offset is a measure of the output with all zeros loaded to the DAC and OFFS_IN = 0. Since the DAC is lifted off the ground by approximately 50 mV, this output will typically be: VOUT = Gain × 50 mV Full-Scale Error This is a measure of the output error with all 1s loaded to the DAC. It is expressed as a percentage of full-scale range. See Fig- ure 6. It is calculated as: Full-Scale Error = VOUT(Full-Scale) – (Ideal Gain × REFIN) where Ideal Gain = 3.52 for AD5532-1/-3/-5 Ideal Gain = 7 for AD5532-2 Output Settling Time This is the time taken from when the last data bit is clocked into the DAC until the output has settled to within ±0.39%. OFFS_IN Settling Time This is the time taken from a 0 V–3 V step change in input volt- age on OFFS_IN until the output has settled to within ±0.39%. Digital-to-Analog Glitch Impulse This is the area of the glitch injected into the analog output when the code in the DAC register changes state. It is specified as the area of the glitch in nV-secs when the digital code is changed by 1 LSB at the major carry transition (011 . . . 11 to 100 . . . 00 or 100 . . . 00 to 011 . . . 11). Digital Crosstalk This is the glitch impulse transferred to the output of one DAC at midscale while a full-scale code change (all 1s to all 0s and vice versa) is being written to another DAC. It is expressed in nV-secs. Analog Crosstalk This the area of the glitch transferred to the output (VOUT) of one DAC due to a full-scale change in the output (VOUT) of another DAC. The area of the glitch is expressed in nV-secs. 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 mea- sured 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 loading all DACs to midscale and measur- ing noise at the output. It is measured in nV/( √Hz)1/2. 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 the DC change in the output level of one DAC at midscale in response to a full-scale code change (all 0s to all 1s and vice versa) and output change of all other DACs. It is expressed in µV. SHA MODE 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. Offset Error This is a measure of the output error when VIN = 70 mV. Ideally, with VIN = 70 mV: VOUT = (Gain × 70) – ((Gain – 1) × VOFFS_IN) mV 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 7. Gain Error This is a measure of the span error of the analog channel. It is the deviation in slope of the transfer function expressed in mV. See Figure 7. It is calculated as: Gain Error = Actual Full-Scale Output – Ideal Full-Scale Output – Offset Error where Ideal Full-Scale Output = Gain × 2.96 – ((Gain – 1) × VOFFS_IN) AC Crosstalk This is the area of the glitch that occurs on the output of one channel while another channel is acquiring. It is expressed in nV-secs. 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. |
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