AD5306 Analog Devices, AD5306 Datasheet - Page 20

• Manufacturer Part Number: AD5306
• Manufacturer: Analog Devices

Specifications of AD5306

• Resolution (bits): 8bit
• Dac Update Rate: 167kSPS
• Dac Settling Time: 6µs
• Max Pos Supply (v): +5.5V
• Single-supply: Yes
• Dac Type: Voltage Out
• Dac Input Format: I2C/Ser 2-wire,Ser

AD5306/AD5316/AD5326
APPLICATIONS
TYPICAL APPLICATION CIRCUIT
The AD5306/AD5316/AD5326 can be used with a wide range
of reference voltages where the devices offer full one-quadrant
multiplying capability over a reference range of 0 V to V
More typically, these devices are used with a fixed precision-
reference voltage. Suitable references for 5 V operation are the
AD780 and REF192 (2.5 V references). For 2.5 V operation, a
suitable external reference is the AD589, a 1.23 V band gap
reference. Figure 36 shows a typical setup for the AD5306/
AD5316/AD5326 when using an external reference. Note that
A0 and A1 can be high or low.
DRIVING V
If an output range of 0 V to V
inputs are configured as unbuffered, the simplest solution is to
connect the reference inputs to V
noisy and somewhat inaccurate, the AD5306/AD5316/AD5326
may be powered from the reference voltage, for example, using
a 5 V reference such as the REF195. The REF195 outputs a
steady supply voltage for the AD5306/AD5316/AD5326. The
typical current required from the REF195 is 500 μA supply
current and approximately 112 μA to supply the reference
inputs, if unbuffered. 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 kΩ load on each output) is
The load regulation of the REF195 is typically 2 ppm/mA,
which results in an error of 5.2 ppm (26 μV) for the 2.6 mA
current drawn from it. This corresponds to a 0.0013 LSB error
at eight bits and a 0.021 LSB error at 12 bits.
612 μA + (5 V/10 kΩ) = 2.6 mA
OR AD599 WITH
AD780/REF192
WITH V
EXT
REF
V
DD
V
IN
= 2.5V
DD
V
OUT
DD
= 5V
FROM THE REFERENCE VOLTAGE
Figure 36. AD5306/AD5316/AD5326
Using a 2.5 V External Reference
0.1μF
1μF
INTERFACE
SERIAL
10μF
DD
V
is required when the reference
DD
V
V
V
V
SCL
SDA
DD
REF
REF
REF
REF
= 2.5V TO 5.5V
A0
. Because this supply may be
A
B
C
D
AD5306/
AD5316/
AD5326
GND
V
V
V
V
A1
OUT
OUT
OUT
OUT
A
B
C
D
DD
.
Rev. F | Page 20 of 24
BIPOLAR OPERATION USING THE
AD5306/AD5316/AD5326
The AD5306/AD5316/AD5326 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.
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 four AD5306 devices on the same serial bus.
Each has a different slave address since the states of the A0 and
A1 pins are different. This allows each of 16 DACs to be written
to or read from independently.
V
DD
AD1585
V
V
MASTER
Figure 37. Bipolar Operation with the AD5306/AD5316/AD5326
RESISTORS
GND
V
OUT
OUT
IN
PULL-UP
V
6V TO 12V
OUT
= (10 × D/2
10μF
=
Figure 38. Multiple AD5306 Devices on One Bus
⎡
⎢
⎢
⎣
(
REFIN
1μF
0.1μF
N
×
) − 5 V
D
/
A1
A0
A1
A0
2
R1
V
V
V
V
A1
A0
GND
SDA
N
REF
REF
REF
REF
SDA
AD5306
AD5306/
AD5316/
)
AD5306
AD5326
A
B
C
D
×
INTERFACE
+5V
SCL SDA
V
(
SERIAL
2-WIRE
R1
DD
SCL
SCL
10kΩ
+
V
V
V
V
R1
OUT
OUT
OUT
OUT
R2
A
B
C
D
V
V
)
DD
DD
⎤
⎥
⎥
⎦
−
AD820/
OP295
A1
A0
A1
A0
REFIN
+5V
–5V
SDA
SDA
AD5306
10kΩ
AD5306
R2
×
SCL
(
R
SCL
2
/
±5V
R
1
)