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AD7715AN-3 Datasheet(PDF) 8 Page - Analog Devices |
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AD7715AN-3 Datasheet(HTML) 8 Page - Analog Devices |
8 / 31 page REV. C AD7715 –8– TERMINOLOGY Integral Nonlinearity This is the maximum deviation of any code from a straight line passing through the endpoints of the transfer function. The end- points of the transfer function are Zero-Scale (not to be confused with Bipolar Zero), a point 0.5 LSB below the first code transition (000 . . . 000 to 000 . . . 001) and Full-Scale, a point 0.5 LSB above the last code transition (111 . . . 110 to 111 . . . 111). The error is expressed as a percentage of full scale. Positive Full-Scale Error Positive Full-Scale Error is the deviation of the last code transi- tion (111 . . . 110 to 111 . . . 111) from the ideal AIN(+) voltage (AIN(–) + VREF/GAIN –3/2 LSBs). It applies to both unipolar and bipolar analog input ranges. Unipolar Offset Error Unipolar Offset Error is the deviation of the first code transition from the ideal AIN(+) voltage (AIN(–) + 0.5 LSB) when oper- ating in the unipolar mode. Bipolar Zero Error This is the deviation of the midscale transition (0111 . . . 111 to 1000 . . . 000) from the ideal AIN(+) voltage (AIN(–) – 0.5 LSB) when operating in the bipolar mode. Gain Error This is a measure of the span error of the ADC. It includes full- scale errors but not zero-scale errors. For unipolar input ranges it is defined as (full scale error–unipolar offset error) while for bipolar input ranges it is defined as (full-scale error–bipolar zero error). Bipolar Negative Full-Scale Error This is the deviation of the first code transition from the ideal AIN(+) voltage (AIN(–) – VREF/GAIN + 0.5 LSB), when oper- ating in the bipolar mode. Positive Full-Scale Overrange Positive full-scale overrange is the amount of overhead available to handle input voltages on AIN(+) input greater than AIN(–) + VREF/GAIN (for example, noise peaks or excess voltages due to system gain errors in system calibration routines) without intro- ducing errors due to overloading the analog modulator or over- flowing the digital filter. Negative Full-Scale Overrange This is the amount of overhead available to handle voltages on AIN(+) below AIN(–) –VREF/GAIN without overloading the analog modulator or overflowing the digital filter. Note that the analog input will accept negative voltage peaks even in the uni- polar mode provided that AIN(+) is greater than AIN(–) and greater than AGND – 30 mV. Offset Calibration Range In the system calibration modes, the AD7715 calibrates its offset with respect to the analog input. The offset calibration range specification defines the range of voltages that the AD7715 can accept and still calibrate offset accurately. Full-Scale Calibration Range This is the range of voltages that the AD7715 can accept in the system calibration mode and still calibrate full scale correctly. Input Span In system calibration schemes, two voltages applied in sequence to the AD7715’s analog input define the analog input range. The input span specification defines the minimum and maxi- mum input voltages from zero to full scale that the AD7715 can accept and still calibrate gain accurately. ON-CHIP REGISTERS The part contains four on-chip registers which can be accessed by via the serial port on the part. The first of these is a Communica- tions Register that decides whether the next operation is a read or write operation and also decides which register the read or write operation accesses. All communications to the part must start with a write operation to the Communications Register. After power- on or RESET, the device expects a write to its Communications Register. The data written to this register determines whether the next operation to the part is a write or a read operation and also determines to which register this read or write operation occurs. Therefore, write access to any of the other registers on the part starts with a write operation to the Communications Register fol- lowed by a write to the selected register. A read operation from any register on the part (including the Communications Register itself and the output data register) starts with a write operation to the Communications Register followed by a read operation from the selected register. The Communication Register also controls the standby mode and the operating gain of the part. The DRDY status is also available by reading from the Communications Register. The second register is a Setup Register that determines calibration modes, filter selection and bipolar/unipolar operation. The third register is the Data Register from which the output data from the part is accessed. The final register is a Test Register that is accessed when testing the device. It is advised that the user does not attempt to access or change the contents of the test register as it may lead to unspecified operation of the device. The registers are discussed in more detail in the following sections. |
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