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AD5451 데이터시트(PDF) 15 Page - Analog Devices

부품명 AD5451
상세설명  Dual-Current Output, Parallel Input, 16 /14-Bit Multiplying DACs with 4-Quadrant Resistors
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AD5451 데이터시트(HTML) 15 Page - Analog Devices

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Data Sheet
AD5547/AD5557
Rev. D | Page 15 of 20
2-Quadrant Multiplying Mode, VOUT = 0 V to +VREF
The AD5547/AD5557 are designed to operate with either
positive or negative reference voltages. As a result, a positive
output can be achieved with an additional op amp, (see
Figure 22); the output becomes
VOUT = +VREF × D/65,536 (AD5547)
(3)
VOUT = +VREF × D/16,384 (AD5557)
(4)
Table 8 shows the positive output vs. code for the AD5547.
Table 8. AD5547 Unipolar Mode Positive Output vs. Code
D in Binary
V
OUT (V)
1111 1111 1111 1111
+V
REF(65,535/65,536)
1000 0000 0000 0000
+V
REF/2
0000 0000 0000 0001
+V
REF(1/65,536)
0000 0000 0000 0000
0
C9
1µF
C8
0.1µF
–5V
WR
WR
RS
RS
2
LDAC
–2.5V
+2.5V
0V TO +2.5V
+5V
AD8628
AD8628
AD5547/AD5557
C7
R1A
16/14 DATA
VDD
RCOMA
R2
R1
ROFSA
RFBA
C6
RFB
ROFS
MSB A0, A1
IOUTA
AGNDA
U2B
C4
1µF
0.1µF
C1
1µF
C2
1µF
C3
0.1µF
C5
VOUTA
VREFA
MSB
A0, A1
LDAC
+V
–V
GND
ADR03
4
VOUT
TRIM
5
6
VIN
U3
U2
2
+5V
16-/14-BIT
Figure 22. Unipolar 2-Quadrant Multiplying Mode, VOUT = 0 to +VREF



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