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ADR02 データシート(PDF) 13 Page - Analog Devices

部品番号 ADR02
部品情報  Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with Four-Quadrant Resistors
PDF  20 Pages
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メーカー  AD [Analog Devices]
ホームページ  http://www.analog.com
Logo AD - Analog Devices

ADR02 データシート(HTML) 13 Page - Analog Devices

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Data Sheet
AD5546/AD5556
Rev. D | Page 13 of 20
VDD
ROFS
ROFSA
VOUT
RFB
RFBA
C6
GND
U1
AD5546/AD5556
IOUT
R2
R1
RCOMA
R1A
16-/14-BIT
DATA
16-/14-BIT
DATA
VREFA
U2B
OP2177
–
+
C4
1µF
C5
0.1µF
C8
1µF
C9
0.1µF
+15V
–15V
WR
WR
LDAC
LDAC
RS
RS
MSB
MSB
C2
0.1µF
C1
1µF
V+
V–
U2A
OP2177
+
–
C7
+5V
+10V
–10V
Figure 20. Unipolar Two-Quadrant Multiplying Mode, VOUT = 0 to +VREF
2
5V
6
5
4
GND
VIN
TRIM
U3
ADR03
VOUT
5V
VDD
R1
ROFS
ROFS
–VREF TO +VREF
VOUT
RFB
RFB
C2
GND
U1
AD5546/AD5556
IOUT
R2
U2A
OP2177
+
–
C1
–VREF
+VREF
RCOM
R1
16-/14-BIT
DATA
16-/14-BIT
DATA
REF
U2B
OP2177
–
+
WR
WR
LDAC
LDAC
RS
RS
MSB
MSB
Figure 21. Four-Quadrant Multiplying Mode, VOUT = –VREF to +VREF
BIPOLAR MODE
Four-Quadrant Multiplying Mode, VOUT = –VREF to +VREF
The AD5546/AD5556 contain on-chip all the four-quadrant
resistors necessary for the precision bipolar multiplying
operation. Such a feature minimizes the number of exponent
components to only a voltage reference, dual op amp, and
compensation capacitor (see Figure 21). For example, with a
10 V reference, the circuit yields a precision, bipolar –10 V to
+10 V output.
AD5546
VOUT = (D/32768 − 1) × VREF
(5)
AD5556
VOUT = (D/16384 − 1) × VREF
(6)
Table 10 shows some of the results for the 16-bit AD5546.



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