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AD668SQ Datasheet(PDF) 4 Page - Analog Devices |
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AD668SQ Datasheet(HTML) 4 Page - Analog Devices |
4 / 16 page AD668 REV. A –4– ORDERING GUIDE Linearity Voltage Temperature Error Max Gain T.C. Package Model 1 Range @ 25 °CMax ppm/°C Option 2 AD668JQ 0 °C to +70°C ±1/2 ±30 Q-24 AD668KQ 0 °C to +70°C ±1/4 ±15 Q-24 AD668AQ –40 °C to +85°C ±1/2 ±30 Q-24 AD668SQ –55 °C to +125°C ±1/2 ±40 Q-24 NOTES 1For details on grade and package offerings screened in accordance with MIL-STD-883, refer to the Analog Devices Military Products Databook or current AD668/883B data sheet. 2Q = Cerdip. DEFINITIONS LINEARITY ERROR (also called INTEGRAL NONLINEAR- ITY OR INL): Analog Devices defines linearity error as the maximum deviation of the actual analog output from the ideal output (a straight line drawn from 0 to FS) for any bit combina- tion expressed in multiples of 1 LSB. The AD668 is laser trimmed to 1/4 LSB (0.006% of FS) maximum linearity error at +25 °C for the K version and 1/2 LSB for the J and S versions. DIFFERENTIAL LINEARITY ERROR (also called DIFFER- ENTIAL NONLINEARITY or DNL): DNL is the measure of the variation in the analog output, normalized to fun scale, asso- ciated with a 1 LSB change in digital input code. MONOTONICITY: A DAC is said to be monotonic if the out- put either increases or remains constant as the digital input in- creases. Monotonic behavior requires that the differential linearity error not exceed 1 LSB in the negative direction. UNIPOLAR OFFSET ERROR (DAC OFFSET): The DAC offset is the portion of the DAC output that is independent of the digital input. The unipolar DAC offset error is measured as the deviation of the analog output from the ideal (0 V or 0 mA) when the analog input is set to 100% and the digital inputs are set to all 0s. BIPOLAR OFFSET ERROR: The deviation of the analog out- put from the ideal (negative half-scale) when the DAC is con- nected in the bipolar mode (Pin 16 connected to Pin 20), the analog input is set to 100%, and the digital inputs are set to all 0s is called the bipolar offset error. BIPOLAR ZERO ERROR: The deviation of the analog output from the ideal (0 V or 0 mA) for bipolar mode when only the MSB is on (100 . . . 00) is called bipolar zero error. COMPLIANCE VOLTAGE: The allowable voltage excursion at the output node of a DAC which will not degrade the accu- racy of the DAC output. SETTLING TIME (DIGITAL CHANNEL): The time re- quired for the output to reach and remain within a specified error band about its final value, measured from the digital input transition. SETTLING TIME (ANALOG CHANNEL): The time re- quired for the output to reach and remain within a specified er- ror band about its final value, measured from the analog input’s crossing of it’s 50% value. GAIN ERROR: The difference between the ideal and actual output span of FS – 1 LSB, expressed either in % of FS or LSB, when all bits are on is called the gain error. PIN CONFIGURATION |
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