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AD5546 Datasheet(PDF) 13 Page - Analog Devices

Part # AD5546
Description  Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with 4-Quadrant Resistors
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD5546 Datasheet(HTML) 13 Page - Analog Devices

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AD5546/AD5556
Rev. 0 | Page 13 of 16
APPLICATIONS
UNIPOLAR MODE
2-Quadrant Multiplying Mode, VOUT = 0 V to –VREF
The AD5546/AD5556 DAC architecture uses a current-steering
R-2R ladder design that requires an external reference and op
amp to convert the unipolar mode of output voltage to
VOUT = –VREF × D/65,536
(AD5546)
(1)
VOUT = –VREF × D/16,384
(AD5556)
(2)
where D is the decimal equivalent of the input code.
The output voltage polarity is opposite to the VREF polarity in
this case (see Figure 21). Table 8 shows the negative output
versus code for the AD5546.
Table 8. AD5546 Unipolar Mode Negative Output vs. Code
D in Binary
VOUT (V)
1111 1111 1111 1111
–VREF(65,535/65,536)
1000 0000 0000 0000
–VREF/2
0000 0000 0000 0001
–VREF(1/65,536)
0000 0000 0000 0000
0
2-Quadrant Multiplying Mode, VOUT = 0 V to +VREF
The AD5546/AD5556 are designed to operate with either
positive or negative reference voltages. As a result, positive
output can be achieved with an additional op amp, (see
Figure 22), and the output becomes
VOUT = +VREF × D/65,536
(AD5546)
(3)
VOUT = +VREF × D/16,384
(AD5556)
(4)
Table 9 shows the positive output versus code for the AD5546.
Table 9. AD5546 Unipolar Mode Positive Output vs. Code
D in Binary
VOUT (V)
1111 1111 1111 1111
+VREF(65,535/65,536)
1000 0000 0000 0000
+VREF/2
0000 0000 0000 0001
+VREF(1/65,536)
0000 0000 0000 0000
0
16/14-BIT
2
+5V
5
4
GND
VIN
TRIM
U3
ADR03
VOUT
VDD
R1
ROFS
ROFS
VOUT
–2.5V TO 0V
RFB
RFB
C6
2.2pF
GND
U1
AD5546/AD5556
IOUT
R2
C4
0.1
µF
C5
1
µF
RCOM
R1
16/14 DATA
REF
U2
AD8628
+
–5V
WR
WR
LDAC
LDAC
RS
RS
MSB
MSB
C2
0.1
µF
C1
1
µF
C3
0.1
µF
V+
V–
Figure 21. Unipolar 2-Quadrant Multiplying Mode, VOUT = 0 to –VREF


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