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AD5451 датащи(PDF) 16 Page - Analog Devices

номер детали AD5451
подробное описание детали  Dual-Current Output, Parallel Input, 16 /14-Bit Multiplying DACs with 4-Quadrant Resistors
PDF  20 Pages
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
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AD5451 датащи(HTML) 16 Page - Analog Devices

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AD5547/AD5557
Data Sheet
Rev. D | Page 16 of 20
BIPOLAR MODE
4-Quadrant Multiplying Mode, VOUT = –VREF to +VREF
The AD5547/AD5557 contain on-chip all the 4-quadrant
resistors necessary for 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 23). For example, with a +10 V reference,
the circuit yields a precision, bipolar –10 V to +10 V output.
VOUT = (D/32768 − 1) × VREF (AD5547)
(5)
VOUT = (D/16384 − 1) × VREF (AD5557)
(6)
Table 9 shows some of the results for the 16-bit AD5547.
Table 9. AD5547 Output vs. Code
D in Binary
V
OUT
1111 1111 1111 1111
+V
REF (32,767/32,768)
1000 0000 0000 0001
+V
REF (1/32,768)
1000 0000 0000 0000
0
0111 1111 1111 1111
–V
REF (1/32,768)
0000 0000 0000 0000
–V
REF
WR
WR
RS
RS
C6 0.1µF
C7 1µF
2
+10V
–10V
–15V
–10V TO +10V
+15V
AD8512
AD8512
AD5547/AD5557
C8
U2A
R1A
16/14 DATA
VDD
RCOMA
R2
U1
R1
ROFSA
RFBA
C9
RFB
ROFS
MSB
A0, A1
IOUTA
AGNDA
U2B
C4 1µF
C1
1µF
C2
0.1µF
C3
0.1µF
C5 0.1µF
VOUT
VREFA
MSB
A0, A1
LDAC
LDAC
+V
–V
GND
ADR01
4
VOUT
TRIM
5
6
VIN
U3
2
+15V
+5V
16-/14-BIT
DAC A
Figure 23. 4-Quadrant Multiplying Mode, VOUT = –VREF to +VREF



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