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AD1380 bảng dữ liệu(PDF) 6 Page - Analog Devices |
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AD1380 bảng dữ liệu(HTML) 6 Page - Analog Devices |
6 / 8 page AD1380 –6– REV. B Table II. Transition Values vs. Calibration Codes Code Under Test Low Side Transition Value 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 NOTE For LSB value for range and resolution used, see Table III. *Voltages given are the nominal value for transition to the code specified. Table III. 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 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 Complement—achieved by using an inverter to complement the most significant bit to produce ( MSB). ***CSB = Complementary Straight Binary. CALIBRATION (14-Bit Resolution Examples) External ZERO ADJ and GAIN ADJ potentiometers, connected as shown in Figures 2 and 3, 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 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 calibra- tion 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 calibration check: set analog input to 0.00000 V; digital output (complementary offset binary) code should be 01111111111111. Figure 9. Analog and Power Connections for Unipolar 0 V to +10 V Input Range |
Số phần tương tự - AD1380 |
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Mô tả tương tự - AD1380 |
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