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參數(shù)資料
| 型號： | AD5338ARM |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | 2.5 V to 5.5 V, 250 UA, 2-Wire Interface Dual-Voltage Output, 8-/10-/12-Bit DACs |
| 中文描述： | SERIAL INPUT LOADING, 7 us SETTLING TIME, 10-BIT DAC, PDSO8 |
| 封裝： | MO-187AA, MSOP-8 |
| 文件頁數(shù)： | 20/24頁 |
| 文件大?。?/td> | 654K |
| 代理商： | AD5338ARM |
AD5337/AD5338/AD5339
APPLICATIONS
TYPICAL APPLICATION CIRCUIT
The AD5337/AD5338/AD5339 can be used with a wide range of
reference voltages for full, one-quadrant multiplying capability
over a reference range of 0 V to V
DD
. More typically, these
devices are used with a fixed precision reference voltage.
Suitable references for 5 V operation are the AD780, the REF192,
and the ADR391 (2.5 V references). For 2.5 V operation, a
suitable external reference would be the AD589 or AD1580, a
1.23 V band gap reference. Figure 36 shows a typical setup for
the AD5337/AD5338/AD5339 when using an external reference.
Note that A0 can be high or low.
Rev. A | Page 20 of 24
AD5337/
AD5338/
AD5339
GND
SDA
SERIAL
INTERFACE
V
OUT
EXT
REF
0.1
μ
F
REFIN
AD780/REF192/ADR391
WITH V
= 5V OR
AD589/AD1580 WITH
V
DD
= 2.5V
V
DD
= 2.5V TO 5.5V
V
IN
A0
10
μ
F
1
μ
F
SCL
V
OUT
A
V
OUT
B
0
Figure 36. AD5337/AD5338/AD5339 Using External Reference
If an output range of 0 V to V
DD
is required, the simplest
solution is to connect the reference input to V
DD
. Because this
supply may be inaccurate and noisy, the AD5337/AD5338/
AD5339 may be powered from a reference voltage, for example,
using a 5 V reference such as the REF195 which provides a
steady output supply voltage. With no load on the DACs, the
REF195 is required to supply 600 μA supply current to the DAC
and 112 μA to the reference input. When the DAC outputs are
loaded, the REF195 also needs to supply the current to the
loads; therefore, the total current required with a 10 k load on
each output is
712 μA
+
2(5 V/10 k
) =
1.7 mA
The load regulation of the REF195 is typically 2 ppm/mA,
which results in an error of 3.4 ppm (17 μV) for the 1.7 mA
current drawn from it. This corresponds to a 0.0009 LSB error
at 8 bits and a 0.014 LSB error at 12 bits.
BIPOLAR OPERATION
The AD5337/AD5338/AD5339 are designed for single-supply
operation, but a bipolar output range is also possible using the
circuit in Figure 37. This circuit gives 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.
+5V
–5V
AD820/
OP295
10
μ
F
6V TO 12V
AD5339
0.1
μ
F
V
DD
V
OUT
A
R1 = 10k
±5V
R2 = 10k
REFIN
A0
GND
V
OUT
V
IN
AD1585
+5V
2-WIRE
SERIAL
INTERFACE
SCL SDA
V
OUT
B
GND
1
μ
F
0
Figure 37. Bipolar Operation with the AD5339
The output voltage for any input code can be calculated as
follows:
(
2
D
REFIN
V
OUT
where:
D is the decimal equivalent of the code loaded to the DAC.
N is the DAC resolution.
REFIN is the reference voltage input.
)
)
)
(
(
(
)
[
]
1
2
1
2
1
R
R
REFIN
R
R
R
N
×
+
×
With
REFIN
= 5 V, R1 = R2 = 10 k:
V
OUT
= (
10 ×
D/
2
N
) 5
MULTIPLE DEVICES ON ONE BUS
Figure 38 shows two AD5339 devices on the same serial bus.
Each has a different slave address because the state of the A0 pin
is different. This allows each of four DACs to be written to or
read from independently.
0
PULL-UP
RESISTORS
SCL
SDA
AD5339
A0
AD5339
SCL
SDA
A0
V
DD
MICROCONTROLLER
Figure 38. Multiple AD5339 Devices on One Bus
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