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DAC703KP датащи(PDF) 9 Page - Texas Instruments

номер детали DAC703KP
подробное описание детали  Monolithic 16-Bit DIGITAL-TO-ANALOG CONVERTERS
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI - Texas Instruments

DAC703KP датащи(HTML) 9 Page - Texas Instruments

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9
®
DAC701, 702, 703
VOLTAGE OUTPUT MODELS
ANALOG OUTPUT
DAC701 UNIPOLAR
DAC703 BIPOLAR
DIGITAL INPUT CODE
16-BIT
15-BIT
14-BIT
16-BIT
15-BIT
14-BIT
1LSB
(
µV)
153
305
610
305
610
1224
0000H
(V)
+9.99985
+9.99969
+9.99939
+9.99960
+9.99939
+9.99878
FFFFH
(V)
0
0
0
–10.0000
–10.0000
–10.0000
ANALOG OUTPUT MODEL
ANALOG OUTPUT
DAC702 BIPOLAR
DIGITAL INPUT CODE
16-BIT
15-BIT
14-BIT
1LSB
(
µA)
0.031
0.061
0.122
0000H
(mA)
–0.99997
–0.99994
–0.99988
FFFFH
(mA)
+1.00000
+1.00000
+1.00000
TABLE II. Digital Input and Analog Output Relationships.
If the output cannot be sensed at Common or the system
ground point as mentioned above, the differential output
circuit shown in Figure 8 is recommended. In this circuit the
output voltage is sensed at the load common and not at the
D/A converter common as in the previous circuits. The value
of R
6 and R7 must be adjusted for maximum common-mode
rejection at RL. Note that if R3 is negligible, the circuit of
Figure 8 can be reduced to the one shown in Figure 7. Again
the effect of R4 is negligible.
The D/A converter and the wiring to its connectors should be
located to provide optimum isolation from sources of RFI
and EMI. The key concept in elimination of RF radiation or
pickup is loop area; therefore, signal leads and their return
conductors should be kept close together. This reduces the
external magnetic field along with any radiation. Also, if a
single lead and its return conductor are wired close together,
they present a small flux-capture cross section for any
external field. This reduces radiation pickup in the circuit.
FIGURE 7. Preferred External Op Amp Configuration.
FIGURE 8. Differential Sensing Output Op Amp
Configuration.
A
1
R
DAC
DAC702
R
B
Common
I
OUT
R
1
R
L
R
3
Sense Output
+5VDC
Supply
±15VDC
Supply
+V
COM
–V
System Ground
Point
+V
COM
Alternate Ground
Sense Connection
R
4
To +V
CC
To –V
CC
To V
DD
1µF
1µF
1µF
*
2.45k
R
F
*
R
2
R should be equal to the output impedance at the current output
to compensate for the bias current drift of A . Use standard 10%,
1/4W carbon composition or equivalent resistors.
B
1
DAC702
2.45k
10k
R
DAC
R
B
R
F
*
R
F
A
1
R
DAC
DAC702
R
6
Common
I
OUT
R
1
R
L
R
3
+5VDC
Supply
±15VDC
Supply
+V
COM
–V
System Ground
Point
+V
COM
Alternate Ground
Sense Connection
R
4
To +V
CC
To –V
CC
To V
DD
1µF
1µF
1µF
2.45k
R
F
*
R
2
DAC702
10k
R
DAC
R
F
*
R
F
R
5
R
7
Sense
Output
+
5
R
7
R=
+
F
R
1
R
R
6 =
DAC
R


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