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| 型號： | AD7392 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Parallel Input Micropower 10- and 12-Bit DACs(并行輸入微功耗12位D/A轉(zhuǎn)換器) |
| 中文描述： | 并行輸入微10 -和12位DAC（并行輸入微功耗12位的D / A轉(zhuǎn)換器） |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 331K |
| 代理商： | AD7392 |
AD7392/AD7393
–10–
REV. 0
UNIPOLAR OUTPUT OPERATION
This is the basic mode of operation for the AD7392. As shown
in Figure 29, the AD7392 has been designed to drive loads as
low as 5 k
in parallel with 100 pF. The code table for this
operation is shown in Table II.
1
20
19
17, 18
0.01μF
+2.7V TO +5.5V
V
DD
AGND/DGND
AD7392
0.1μF
10μF
DIGITAL INTERFACE
CIRCUITRY OMITTED
FOR CLARITY
V
OUT
R
≥
5k
C
≥
100pF
REF
EXT
REF
R
Figure 29. AD7392 Unipolar Output Operation
Table II. Unipolar Code Table
Hexadecimal
Number
in DAC Register
Decimal
Number
in DAC Register
Output
Voltage (V)
V
REF
= 2.5 V
FFF
801
800
7FF
000
4095
2049
2048
2047
0
2.4994
1.2506
1.2500
1.2494
0
The circuit can be configured with an external reference plus
power supply or powered from a single dedicated regulator
or reference depending on the application performance
requirements.
BIPOLAR OUTPUT OPERATION
Although the AD7393 has been designed for single-supply
operation, the output can be easily configured for bipolar
operation. A typical circuit is shown in Figure 30. This circuit
uses a clean regulated +5 V supply for power, which also
provides the circuit’s reference voltage. Since the AD7393
output span swings from ground to very near +5 V, it is necessary
to choose an external amplifier with a common-mode input
voltage range that extends to its positive supply rail. The
micropower consumption OP196 has been designed just for this
purpose and results in only 50 microamps of maximum current
consumption. Connection of the equal valued 470 k
resistors
results in a differential amplifier mode of operation with a
voltage gain of two, which produces a circuit output span of ten
volts (that is, –5 V to +5 V). As the DAC is programmed from
zero-code 000
H
to midscale 200
H
to full scale 3FF
H
, the circuit
output voltage V
O
is set at –5 V, 0 V and +5 V (minus 1 LSB).
The output voltage V
O
is coded in offset binary according to
Equation 4.
V
O
=
D
512–1
×
5
Equation 4
where
D
is the decimal code loaded in the AD7393 DAC
register. Note that the LSB step size is 10/1024 = 10 mV. This
circuit has been optimized for micropower consumption
including the 470 k
gain setting resistors, which should have
low temperature coefficients to maintain accuracy and matching
(preferably the same resistor material, such as metal film). If
better stability is required, the power supply could be substi-
tuted with a precision reference voltage such as the low drop out
REF195, which can easily supply the circuit’s 162
μ
A of
current, and still provide additional power for the load con-
nected to V
O
. The micropower REF195 is guaranteed to source
10 mA output drive current, but only consumes 50
μ
A inter-
nally. If higher resolution is required, the AD7392 can be used
with the addition of two more bits of data inserted into the
software coding, which would result in a 2.5 mV LSB step size.
Table III shows examples of nominal output voltages V
O
provided by the Bipolar Operation circuit application.
V
O
C
V
DD
REF
GND
<100μA
<2μA
470k
+5V
I
SY
< 162μA
OP196
470k
+5V
–5V
BIPOLAR
OUTPUT
SWING
–5V
AD7393
DIGITAL INTERFACE CIRCUITRY OMITTED FOR CLARITY
V
OUT
<50μA
Figure 30. Bipolar Output Operation
Table III. Bipolar Code Table
Hexadecimal
Number
In DAC Register
Decimal
Number
in DAC Register
Analog
Output
Voltage (V)
3FF
201
200
1FF
000
1023
513
512
511
0
4.9902
0.0097
0.0000
–0.0097
–5.0000
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