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DAC8043AEP датащи(PDF) 8 Page - Analog Devices

номер детали DAC8043AEP
подробное описание детали  12-Bit Serial Input Multiplying D/A Converter
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
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DAC8043AEP датащи(HTML) 8 Page - Analog Devices

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REV. 0
DAC8043A
–8–
UNIPOLAR 2-QUADRANT MULTIPLYING
The most straightforward application of the DAC8043A is in
the 2-quadrant multiplying configuration shown in Figure 19. If
the reference input signal is replaced with a fixed dc voltage
reference, the DAC output will provide a proportional dc volt-
age output according to the transfer equation:
VOUT = –D/4096
× V
REF
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
20k
10pF
Figure 20. Bipolar (4-Quadrant) Operation
8-Lead SOIC (SO-8)
0.1968 (5.00)
0.1890 (4.80)
8
5
4
1
0.2440 (6.20)
0.2284 (5.80)
PIN 1
0.1574 (4.00)
0.1497 (3.80)
0.0688 (1.75)
0.0532 (1.35)
SEATING
PLANE
0.0098 (0.25)
0.0040 (0.10)
0.0192 (0.49)
0.0138 (0.35)
0.0500
(1.27)
BSC
0.0098 (0.25)
0.0075 (0.19)
0.0500 (1.27)
0.0160 (0.41)
0.0196 (0.50)
0.0099 (0.25)
x 45°
8-Lead Plastic DIP (N-8)
8
14
5
0.430 (10.92)
0.348 (8.84)
0.280 (7.11)
0.240 (6.10)
PIN 1
SEATING
PLANE
0.022 (0.558)
0.014 (0.356)
0.060 (1.52)
0.015 (0.38)
0.210 (5.33)
MAX
0.130
(3.30)
MIN
0.070 (1.77)
0.045 (1.15)
0.100
(2.54)
BSC
0.160 (4.06)
0.115 (2.93)
0.325 (8.25)
0.300 (7.62)
0.015 (0.381)
0.008 (0.204)
0.195 (4.95)
0.115 (2.93)
8-Lead TSSOP (RU-8)
8
5
4
1
0.122 (3.10)
0.114 (2.90)
PIN 1
0.0256 (0.65)
BSC
SEATING
PLANE
0.006 (0.15)
0.002 (0.05)
0.0118 (0.30)
0.0075 (0.19)
0.0433
(1.10)
MAX
0.0079 (0.20)
0.0035 (0.090)
0.028 (0.70)
0.020 (0.50)
8
0
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).


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