AD5339 Analog Devices, AD5339 Datasheet - Page 20

• Manufacturer Part Number: AD5339
• Description: 2.5 V to 5.5 V, 250 µA, 2-Wire Interface, Dual Voltage Output,12-Bit DACs
• Manufacturer: Analog Devices

Specifications of AD5339

• Resolution (bits): 12bit
• Dac Update Rate: 14.8kSPS
• Dac Settling Time: 8µs
• Max Pos Supply (v): +5.5V
• Single-supply: Yes
• Dac Type: Voltage Out
• Dac Input Format: I2C/Ser 2-wire

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
these devices are used with a fixed precision reference voltage.
Suitable references for 5 V operation are the AD780, the REF192,
and the
suitable external reference would be the
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.
If an output range of 0 V to V
solution is to connect the reference input to V
supply can be inaccurate and noisy, the AD5337/AD5338/
AD5339 can 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 kΩ load on each
output is
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.
AD780/REF192/ADR391
AD589/AD1580 WITH
WITH V
712 μA + 2 × (5 V/10 kΩ) = 1.7 mA
V
EXT
REF
Figure 36. AD5337/AD5338/AD5339 Using External Reference
V
IN
DD
ADR391
DD
= 2.5V
V
0.1µF
= 5V OR
OUT
(2.5 V references). For 2.5 V operation, a
1µF
10µF
INTERFACE
SERIAL
DD
V
DD
REFIN
SCL
SDA
is required, the simplest
= 2.5V TO 5.5V
A0
AD5337/
AD5338/
AD5339
AD589
GND
DD
DD
. More typically,
or AD1580, a
. Because this
V
V
OUT
OUT
A
B
Rev. C | Page 20 of 28
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
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 kΩ:
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.
6V TO 12V
V
V
V
IN
MICROCONTROLLER
AD1585
OUT
10µF
OUT
GND
AD820
= (10 × D/2
V
=
OUT
Figure 38. Multiple AD5339 Devices on One Bus
V
Figure 37. Bipolar Operation with the AD5339
⎡
⎢
⎣
0.1µF
DD
RESISTORS
⎛
⎜
⎝
REFIN
PULL-UP
or an
1µF
+5V
N
OP295
) − 5
×
V
REFIN
A0
GND
DD
2
D
N
AD5339
R1 = 10kΩ
INTERFACE
⎞
⎟
⎠
SCL
as the output amplifier.
SERIAL
2-WIRE
×
R1
V
V
SDA
OUT
OUT
R1
+
B
A0
A
A0
R2
SDA
SDA
AD5339
AD5339
−
AD820/
OP295
REFIN
+5V
–5V
R2 = 10kΩ
SCL
SCL
×
R2
R1
±5V
⎤
⎥
⎦