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AD5557CRUZ Datasheet(数据表) 14 Page - Analog Devices

部件型号  AD5557CRUZ
说明  Dual-Current Output, Parallel Input, 16-/14-Bit Multiplying DACs
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制造商  AD [Analog Devices]
网页  http://www.analog.com
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AD5557CRUZ Datasheet(HTML) 14 Page - Analog Devices

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AD5547/AD5557
Data Sheet
Rev. D | Page 14 of 20
APPLICATIONS INFORMATION
UNIPOLAR MODE
2-Quadrant Multiplying Mode, VOUT = 0 V to –VREF
The AD5547/AD5557 DAC architecture uses a current-steering
R-2R ladder design that requires an external reference and op
amp to convert the unipolar mode of the output voltage to
VOUT = −VREF × D/65,536 (AD5547)
(1)
VOUT = −VREF × D/16,384 (AD5557)
(2)
where D is the decimal equivalent of the input code.
In this case, the output voltage polarity is opposite the VREF
polarity (see Figure 21). Table 7 shows the negative output vs.
code for the AD5547.
Table 7. AD5547 Unipolar Mode Negative 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
WR
WR
RS
RS
2
LDAC
+2.5V
AD8628
AD5547/AD5557
R1A
16/14 DATA
VDD
RCOMA
R2
U1
R1
ROFSA
RFBA
C6
RFB
ROFS
MSB A0, A1
IOUTA
AGNDA
6.8pF
C1
1µF
C2
0.1µF
C3
0.1µF
VOUTA
VREFA
MSB
A0, A1
LDAC
+V
–V
GND
4
VOUT
TRIM
ADR03
5
6
VIN
U3
2
+5V
16-/14-BIT
2.5V
C4
1µF
0.1µF
C5
–5V
–2.5V TO 0V
Figure 21. Unipolar 2-Quadrant Multiplying Mode, VOUT = 0 to –VREF




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