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AD7226BRSZ Arkusz danych(PDF) 4 Page - Analog Devices |
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AD7226BRSZ Arkusz danych(HTML) 4 Page - Analog Devices |
4 / 16 page REV. –4– AD7226 PIN CONFIGURATIONS DIP and SOIC/SSOP TOP VIEW (Not to Scale) 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 AD7226 VREF AGND DGND DB7 (MSB) DB6 A0 A1 WR DB0(LSB) DB5 DB4 DB3 DB2 DB1 VSS VOUTA VOUTBVOUTC VOUTD VDD PLCC 3 2 1 20 19 9 10 11 12 13 18 17 16 15 14 4 5 6 7 8 TOP VIEW (Not to Scale) V REF AGND DGND DB7 (MSB) DB8 AD7226 VDD A0 A1 WR DB0(LSB) TERMINOLOGY TOTAL UNADJUSTED ERROR This is a comprehensive specification that includes full-scale error, relative accuracy and zero code error. Maximum output voltage is VREF – 1 LSB (ideal), where 1 LSB (ideal) is VREF/ 256. The LSB size will vary over the VREF range. Hence the zero code error will, relative to the LSB size, increase as VREF decreases. Accordingly, the total unadjusted error, which includes the zero code error, will also vary in terms of LSB’s over the VREF range. As a result, total unadjusted error is specified for a fixed refer- ence voltage of 10 V. RELATIVE ACCURACY Relative Accuracy or endpoint nonlinearity, is a measure of the maximum deviation from a straight line passing through the endpoints of the DAC transfer function. It is measured after allowing for zero and full-scale error and is normally expressed in LSB’s or as a percentage of full-scale reading. DIFFERENTIAL NONLINEARITY Differential Nonlinearity is the difference between the measured change and the ideal 1 LSB change between any two adjacent codes. A specified differential nonlinearity of ±1 LSB max over the operating temperature range ensures monotonicity. DIGITAL CROSSTALK The glitch impulse transferred to the output of one converter due to a change in the digital input code to another of the con- verters. It is specified in nV secs and is measured at VREF = 0 V. FULL SCALE ERROR Full-Scale Error is defined as: Measured Value – Zero Code Error – Ideal Value 4 o f 1 4 D |
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