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AD7711AR Arkusz danych(PDF) 8 Page - Analog Devices |
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AD7711AR Arkusz danych(HTML) 8 Page - Analog Devices |
8 / 28 page REV. F –8– AD7711 Pin Mnemonic Function 20 RFS Receive Frame Synchronization. Active low logic input used to access serial data from the device. In the self-clocking mode, the SCLK and SDATA lines both become active after RFS goes low. In the external clocking mode, the SDATA line becomes active after RFS goes low. 21 DRDY Logic output. A falling edge indicates that a new output word is available for transmission. The DRDY pin will return high upon completion of transmission of a full output word. DRDY is also used to indicate when the AD7711 has completed its on-chip calibration sequence. 22 SDATA Serial Data. Input/Output with serial data being written to either the control register or the calibration registers and serial data being accessed from the control register, calibration registers or the data register. During an output data read operation, serial data becomes active after RFS goes low (provided DRDY is low). During a write operation, valid serial data is expected on the rising edges of SCLK when TFS is low. The output data coding is natural binary for unipolar inputs and offset binary for bipolar inputs. 23 DVDD Digital Supply Voltage, +5 V. DVDD should not exceed AVDD by more than 0.3 V in normal operation. 24 DGND Ground reference point for digital circuitry. 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 transi- tion (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 input full-scale voltage. For AIN1(+), the ideal full-scale input voltage is (AIN1(–) + VREF/GAIN – 3/2 LSBs); for AIN2, the ideal full- scale input voltage is 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 voltage. For AIN1(+), the ideal input voltage is (AIN1(–) + 0.5 LSB); for AIN2, the ideal input is 0.5 LSB when operating in the unipolar mode. BIPOLAR ZERO ERROR This is the deviation of the midscale transition (0111 . . . 111 to 1000 . . . 000) from the ideal input voltage. For AIN1(+), the ideal input voltage is (AIN1(–) – 0.5 LSB); for AIN2, the ideal input is – 0.5 LSB when operating in the bipolar mode. BIPOLAR NEGATIVE FULL-SCALE ERROR This is the deviation of the first code transition from the ideal input voltage. For (AIN1(+), the ideal input voltage is (AIN1(–) – VREF/GAIN + 0.5 LSB); for AIN2 the ideal input is – VREF/ GAIN + 0.5 LSB when operating in the bipolar mode. POSITIVE FULL-SCALE OVERRANGE Positive full-scale overrange is the amount of overhead available to handle input voltages on AIN1(+) input greater than AIN1(–) + VREF/GAIN or on the AIN2 input greater than + 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 to overflowing the digital filter. NEGATIVE FULL-SCALE OVERRANGE This is the amount of overhead available to handle voltages on AIN1(+) below AIN1(–) – VREF/GAIN or on AIN2 below –VREF/GAIN without overloading the analog modulator or over- flowing the digital filter. Note that the analog input will accept negative voltage peaks on AIN1(+) even in the unipolar mode provided that AIN1(+) is greater than AIN1(–) and greater than VSS – 30 mV. OFFSET CALIBRATION RANGE In the system calibration modes, the AD7711 calibrates its offset with respect to the analog input. The offset calibration range specification defines the range of voltages that the AD7711 can accept and still calibrate offset accurately. FULL-SCALE CALIBRATION RANGE This is the range of voltages that the AD7711 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 AD7711’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 AD7711 can accept and still calibrate gain accurately. |
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