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AD1376 Datasheet(PDF) 6 Page - Analog Devices |
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AD1376 Datasheet(HTML) 6 Page - Analog Devices |
6 / 8 page AD1376/AD1377 –6– REV. B CALIBRATION (14-Bit Resolution Examples) External ZERO ADJ and GAIN ADJ potentiometers, connected as shown in Figures 4 and 5, are used for device calibration. To prevent interaction of these two adjustments, Zero is always adjusted first and then Gain. Zero is adjusted with the analog input near the most negative end of the analog range (0 for unipolar and –FS for bipolar input ranges). Gain is adjusted with the analog input near the most positive end of the analog range. 0 V to + 10 V Range Set analog input to +1 LSB14 = 0.00061 V. Adjust Zero for digital output = 11111111111110. Zero is now calibrated. Set analog input to +FSR – 2 LSB = +9.99878 V. Adjust Gain for 00000000000001 digital output code; full scale (Gain) is now calibrated. Half scale calibration check: set analog input to +5.00000 V; digital output code should be 01111111111111. –10 V to + 10 V Range Set analog input to 9.99878 V; adjust zero for 1111111111110 digital output (complementary offset binary) code. Set analog input to 9.99756 V; adjust Gain for 00000000000001 digital output (complementary offset binary) code. Half scale calibra- tion check set analog input to 0.00000 V; digital output (com- plementary offset binary) code should be 01111111111111. Figure 11. Analog and Power Connections for Unipolar 0 V to +10 V Input Range Table III. Transition Values vs. Calibration Codes Code Under Test Low Side Transition Values MSB LSB Range ±10 V ±5 V ±2.5 V 0 V to +10 V 0 V to +5 V 000 ……… 000* +Full Scale +10 V +5 V +2.5 V +10 V +5 V –3/2 LSB –3/2 LSB –3/2 LSB –3/2 LSB –3/2 LSB 011……… 111 Mid Scale 0–1/2 LSB 0–1/2 LSB 0–1/2 LSB +5 V–1/2 LSB +2.5 V–1/2 LSB 111……… 110 –Full Scale –10 V –5 V –2.5 V 0 V 0 V +1/2 LSB +1/2 LSB +1/2 LSB +1/2 LSB +1/2 LSB *Voltages given are the nominal value for Transition to the code specified. Note: For LSB value for range and resolution used, see Table IV. Table IV. Input Voltage Range and LSB Values Analog Input Voltage Range ±10 V ±5 V ±2.5 V 0 V to +10 V 0 V to +5 V Code COB* COB* COB* Designation or CTC** or CTC** or CTC** CSB*** CSB*** One Least FSR 20 V 10 V 5 V 10 V 5 V Significant 2 n 2 n 2 n 2 n 2 n 2 n Bit (LSB) n = 8 78.13 mV 39.06 mV 19.53 mV 39.06 mV 19.53 mV n = 10 19.53 mV 9.77 mV 4.88 mV 9.77 mV 4.88 mV n = 12 4.88 mV 2.44 mV 1.22 mV 2.44 mV 1.22 mV n = 13 2.44 mV 1.22 mV 0.61 mV 1.22 mV 0.61 mV n = 14 1.22 mV 0.61 mV 0.31 mV 0.61 mV 0.31 mV n = 15 0.61 mV 0.31 mV 0.15 mV 0.31 mV 0.15 mV NOTES ***COB = Complementary Offset Binary. ***CTC = Complementary Twos Complementary—achieved by using an inverter to complement the most significant bit to product ( MSB). ***CSB = Complementary Straight Binary. |
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