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參數(shù)資料
| 型號： | AD5325BRM-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | 2.5 V to 5.5 V, 500 uA, 2-Wire Interface Quad Voltage Output, 8-/10-/12-Bit DACs |
| 中文描述： | SERIAL INPUT LOADING, 8 us SETTLING TIME, 12-BIT DAC, PDSO10 |
| 封裝： | MO-187BA, MSOP-10 |
| 文件頁數(shù)： | 16/20頁 |
| 文件大?。?/td> | 427K |
| 代理商： | AD5325BRM-REEL |
REV. F
–16–
AD5305/AD5315/AD5325
If an output range of 0 V to V
DD
is required, the simplest solution
is to connect the reference input to V
DD
. As this supply may not be
very accurate and may be noisy, the AD5305/AD5315/AD5325
may be powered from the reference voltage; for example, using
a 5 V reference such as the REF195. The REF195 will output
a steady supply voltage for the AD5305/AD5315/AD5325. The
typical current required from the REF195 is 600
μ
A supply cur-
rent and approximately 112
μ
A into the reference input. This is
with no load on the DAC outputs. When the DAC outputs are
loaded, the REF195 also needs to supply the current to the loads.
The total current required (with a 10 k
load on each output) is
+
/
The load regulation of the REF195 is typically 2 ppm/mA, which
results in an error of 5.4 ppm (27
μ
V) for the 2.7 mA current
drawn from it. This corresponds to a 0.0014 LSB error at eight
bits and 0.022 LSB error at 12 bits.
Bipolar Operation Using the AD5305/AD5315/AD5325
The AD5305/AD5315/AD5325 have been designed for single-
supply operation, but a bipolar output range is also possible using
the circuit in Figure 12. This circuit will give an output voltage
range of
±
5 V. Rail-to-rail operation at the amplifier output is
achievable using an AD820 or an OP295 as the output amplifier.
712
4 5
10
2.
μ
A
V
k
mA
)
=
+5V
–5V
AD820/
OP295
10 F
6V TO 12V
AD5305
0.1 F
V
DD
V
OUT
A
R1 = 10k
5V
R2 = 10k
REFIN
A0
GND
V
OUT
V
IN
AD1585
1 F
+5V
2-WIRE
SERIAL
INTERFACE
SCL SDA
V
OUT
C
V
OUT
D
V
OUT
B
GND
Figure 12. Bipolar Operation with the AD5305
The output voltage for any input code can be calculated as
follows:
×
(
+
(
where
D
is the decimal equivalent of the code loaded to the DAC.
N
is the DAC resolution.
REFIN
is the reference voltage input.
with
REFIN
= 5
V
,
R1
=
R2
= 10 k
:
(
V
REFIN
D 2
R1
R2
R1
REFIN
R2 R1
/
OUT
N
=
)
×
)
×
(
)
/
/
–
V
D 2
OUT
N
=
×
)
10
5
/
–
V
Multiple Devices on One Bus
Figure 13 shows two AD5305 devices on the same serial bus.
Each has a different slave address since the state of the A0 pin is
different. This allows each of eight DACs to be written to or
read from independently.
PULL-UP
RESISTORS
MICRO-
CONTROLLER
SCL
SDA
AD5305
A0
AD5305
SCL
SDA
A0
V
DD
Figure 13. Multiple AD5305 Devices on One Bus
AD5305/AD5315/AD5325 as a Digitally Programmable Window
Detector
A digitally programmable upper/lower limit detector using two
of the DACs in the AD5305/AD5315/AD5325 is shown in
Figure 14. The upper and lower limits for the test are loaded to
DACs A and B, which, in turn, set the limits on the CMP04. If
the signal at the V
IN
input is not within the programmed window,
an LED will indicate the fail condition. Similarly, DACs C and
D can be used for window detection on a second V
IN
signal.
1/2
AD5305/
AD5315/
AD5325
*
V
DD
5V
V
OUT
A
GND
REFIN
V
IN
PASS/
FAIL
1/2
CMP04
1/6 74HC05
FAIL
PASS
1k
0.1 F
10 F
SCL
SDA
SCL
DIN
1k
V
OUT
B
V
REF
*
ADDITIONAL PINS OMITTED FOR CLARITY
Figure 14. Window Detection
Coarse and Fine Adjustment Using the AD5305/AD5315/
AD5325
Two of the DACs in the AD5305/AD5315/AD5325 can be
paired together to form a coarse and fine adjustment function,
as shown in Figure 15. DAC A is used to provide the coarse
adjustment while DAC B provides the fine adjustment. Varying
the ratio of R1 and R2 will change the relative effect of the
coarse and fine adjustments. With the resistor values and exter-
nal reference shown, the output amplifier has unity gain for the
DAC A output, so the output range is 0 V to 2.5 V – 1 LSB. For
DAC B, the amplifier has a gain of 7.6
×
10
–3
, giving DAC B
a range equal to 19 mV. Similarly, DACs C and D can be paired
together for coarse and fine adjustment.
The circuit is shown with a 2.5 V reference, but reference volt-
ages up to V
DD
may be used. The op amps indicated will allow
a rail-to-rail output swing.
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