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AD7711A Datasheet(PDF) 8 Page - Analog Devices |
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AD7711A Datasheet(HTML) 8 Page - Analog Devices |
8 / 27 page REV. C AD7711A –8– Pin Mnemonic Function 19 TFS Transmit Frame Synchronization. Active low logic input used to write serial data to the device with serial data expected after the falling edge of this pulse. In the self-clocking mode, the serial clock becomes active after TFS goes low. In the external clocking mode, TFS must go low before the first bit of the data word is written to the part. 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 AD7711A 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 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. 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 avail- able to handle input voltages on AIN(+) input greater than AIN(–) + VREF/GAIN (for example, noise peaks or excess volt- ages due to system gain errors in system calibration routines) without introducing errors due to overloading the analog modu- lator or overflowing 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 VSS – 30 mV. OFFSET CALIBRATION RANGE In the system calibration modes, the AD7711A calibrates its offset with respect to the analog input. The Offset Calibration Range specification defines the range of voltages that the AD7711A can accept and still accurately calibrate offset. FULL-SCALE CALIBRATION RANGE This is the range of voltages that the AD7711A can accept in the system calibration mode and still correctly calibrate full-scale. INPUT SPAN In system calibration schemes, two voltages applied in sequence to the AD7711A’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 AD7711A can accept and still calibrate accurately gain. |
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