AD7866 查看數據表（PDF） - Analog Devices
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AD7866 Datasheet PDF : 25 Pages
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CS
SCLK
RANGE
A
B
1
8
VREF/2 ؎ VREF/2
INPUT RANGE
16
1
AD7866
16
DOUTA
DOUTB
TWOS COMPLEMENT
Figure 7. Selecting VREF/2 ± VREF/2 Input Range with Twos Complement Output Coding
A
B
CS
0V TO 2 ؋ VREF
INPUT RANGE
1
8
16
1
16
SCLK
RANGE
DOUTA
DOUTB
STRAIGHT BINARY
Figure 8. Selecting 0 V to 2 ϫ VREF Input Range with Straight Binary Output Coding
V
0V
VREF
VDD
100nF
REF SELECT
VREF
R4
R3
R2
V
470nF
470nF
DCAPA
DCAPB
VDRIVE
AD7866
VIN
DOUT
TWOS
COMPLEMENT
VDD
DSP/P
R1
+VREF (= 2 ؋ VREF)
011 111
R1 = R2 = R3 = R4
VREF
000 000
(= 0V)
–VREF
100 000
Figure 9. Handling Bipolar Signals with the AD7866
111...111
111...110
111...000
011...111
1LSB = VREF/4096
000...010
000...001
000...000
0V 1LSB
VREF – 1LSB
ANALOG INPUT
Figure 10. Straight Binary Transfer
Characteristic with 0 V to VREF Input Range
011...111
011...110
1LSB = 2 ؋ VREF/4096
000...001
000...000
111...111
100...010
100...001
100...000
–VREF + 1LSB
+VREF – 1LSB
VREF – 1LSB
ANALOG INPUT
Figure 11. Twos Complement Transfer
Characteristic with VREF ± VREF Input Range
REV. A
–13–
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