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REV. B
DAC8043A
–8–
C00272–0–4/06
(B)
reference, the DAC output will provide a proportional dc voltage
output according to the transfer equation:
VOUT = –D/4096
× VREF
where D is the decimal data loaded into the DAC register and
VREF is the externally applied reference voltage source.
VREF
IOUT
GND
OP77
2R
R
RFB
VAC
VDD
RFB
10VP
VOUT
2R
DIGITAL INPUTS OMITTED FOR CLARITY
10pF
Figure 19. Unipolar (2-Quadrant) Operation
BIPOLAR 4-QUADRANT MULTIPLYING
Figure 20 shows a suggested circuit to achieve 4-quadrant mul-
tiplying operation. The summing amplifier multiplies VOUT1 by
2, and offsets the output with the reference voltage so that a
midscale digital input code of 2048 places VOUT2 at zero volts.
The negative full-scale voltage will be VREF when the DAC is
loaded with all zeros. The positive full-scale output will be
–(VREF – 1 LSB) when the DAC is loaded with all ones. Thus
the digital coding is offset binary. The voltage output transfer
equation for various input data and reference (or signal) values
follows:
VOUT2 = (D/2048 – 1)
× –V
REF
where D is the decimal data loaded into the DAC register and
VREF is the externally applied reference voltage source.
Precision resistors will be necessary to avoid ratio errors. Other-
wise trimming will be required to achieve full accuracy specifica-
tions available from the DAC8043A device. See the various
Analog Devices Digital Potentiometer products for automated
trimming solutions (e.g., the AD5204 for low voltage applica-
tions or the AD7376 for high voltage applications).
(0V TO –VREF)
VREF
IOUT
GND
2R
R
RFB
VAC
VDD
RFB
10VP
VOUT1
2R
DIGITAL INPUTS OMITTED FOR CLARITY
OP213
10k
OP213
VOUT2
20k
10pF
Figure 20. Bipolar (4-Quadrant) Operation
8-Lead Standard Small Outline Package [SOIC_N]
(R-8)
S-Suffix
Dimensions shown in millimeters and (inches).
8-Lead Plastic Dual In-Line Package [PDIP]
(N-8)
Dimensions shown in inches and (millimeters).
8-Lead Thin Shrink Small Outline Package [TSSOP]
(RU-8)
Dimensions shown in millimeters.
OUTLINE DIMENSIONS
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