AD1380 데이터 시트보기 (PDF) - Analog Devices
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AD1380 Datasheet PDF : 8 Pages
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AD1380
Table II. Transition Values vs. Calibration Codes
Code Under Test
MSB
LSB
000 . . . 000*
Range
+ Full Scale
؎10 V
+10 V
–3/2 LSB
Low Side Transition Value
؎5 V
؎2.5 V
0 V to +10 V
+5 V
–3/2 LSB
+2.5 V
–3/2 LSB
+10 V
–3/2 LSB
011 . . . 111
111 . . . 110
Mid Scale
–Full Scale
0–1/2 LSB
–10 V
+1/2 LSB
0–1/2 LSB
–5 V
+1/2 LSB
0–1/2 LSB
–2.5 V
+1/2 LSB
+5 V–1/2 LSB
0V
+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.
0 V to +5 V
+5 V
–3/2 LSB
+2.5 V–1/2 LSB
0V
+1/2 LSB
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
Designation
COB*
or CTC**
COB*
or CTC**
COB*
or CTC**
CSB***
CSB***
One Least FSR FSR
20 V
10 V
5V
Significant
2n
2n
2n
2n
(Bit LSB)
10 V
5V
2n
2n
n=8
n = 10
n = 12
n = 13
n = 14
n = 15
78.13 mV
19.53 mV
4.88 mV
2.44 mV
1.22 mV
0.61 mV
39.06 mV
9.77 mV
2.44 mV
1.22 mV
0.61 mV
0.31 mV
19.53 mV
4.88 mV
1.22 mV
0.61 mV
0.31 mV
0.15 mV
39.06 mV
9.77 mV
2.44 mV
1.22 mV
0.61 mV
0.31 mV
19.53 mV
4.88 mV
1.22 mV
0.61 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
–6–
REV. B
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