AD5327BRUZ Analog Devices Inc, AD5327BRUZ Datasheet - Page 20

• Manufacturer Part Number: AD5327BRUZ
• Description: IC DAC 12BIT QUAD 2.5V 16-TSSOP
• Manufacturer: Analog Devices Inc

Specifications of AD5327BRUZ

• Data Interface: Serial
• Settling Time: 8µs
• Number Of Bits: 12
• Number Of Converters: 4
• Voltage Supply Source: Single Supply
• Power Dissipation (max): 4.5mW
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 16-TSSOP
• Resolution (bits): 12bit
• Sampling Rate: 125kSPS
• Input Channel Type: Serial
• Supply Voltage Range - Analog: 2.5V To 5.5V
• Supply Current: 500µA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AD5307/AD5317/AD5327
APPLICATIONS
TYPICAL APPLICATION CIRCUIT
The AD5307/AD5317/AD5327 can be used with a wide range
of reference voltages and offer full, one-quadrant multiplying
capability over a reference range of 0.25 V to V
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 refer-
ence would be the AD589, a 1.23 V band gap reference. Figure 41
shows a typical setup for the AD5307/AD5317/AD5327 when
using an external reference.
DRIVING V
If an output range of 0 V to V
inputs are configured as unbuffered, the simplest solution is to
connect the reference input to V
noisy and not very accurate, the AD5307/AD5317/AD5327 can
be powered from the reference voltage, for example, from a 5 V
reference such as the REF195, which outputs a steady supply
voltage. The typical current required from the REF195 with no
load on the DAC outputs is 500 μA supply current and ≈112 μA
into the reference inputs (if unbuffered). 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.
Figure 41. AD5307/AD5317/AD5327 Using a 2.5 V External Reference
612 μA + 4 (5 V/10 kΩ) = 2.6 mA
OR AD589 WITH
AD780/REF192
WITH V
V
EXT
REF
DD
V
= 2.5V
DD
V
IN
OUT
DD
= 5V
FROM THE REFERENCE VOLTAGE
0.1µF
1µF
INTERFACE
SERIAL
DD
10µF
is required when the reference
DD
V
. Because this supply can be
DD
AD5307/AD5317/
= 2.5V TO 5.5V
V
V
SCLK
DIN
SYNC
REF
REF
AD5327
AB
CD
GND
DD
V
V
V
. More typically,
V
OUT
OUT
OUT
OUT
A
C
D
B
Rev. C | Page 20 of 28
BIPOLAR OPERATION
The AD5307/AD5317/AD5327 are designed for single-supply
operation, but a bipolar output range is also possible using the
circuit shown in Figure 42. This circuit provides an output
voltage range of 5 V. Rail-to-rail operation at the amplifier
output is achievable by 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.
When REFIN = 5 V, R1 = R2 = 10 kΩ,
REF195
GND
V
IN
V
V
V
OUT
Figure 42. Bipolar Operation with the AD5307/AD5317/AD5327
OUT
OUT
+6V TO +16V
10µF
= (10 × D/2
=
⎡
⎢
⎢
⎣
(
1µF
REFIN
0.1µF
×
N
D
) − 5 V
2 /
R
1
N
AD5307/AD5317/
V
V
GND
)
DIN
REF
REF
×
(
INTERFACE
AD5327
AB
CD
R1
SCLK
SERIAL
V
+
+5V
DD
R2
10kΩ
V
V
V
V
R1
SYNC
)
OUT
OUT
OUT
OUT
⎤
⎥
⎥
⎦
−
A
B
C
D
REFIN
×
10kΩ
(
R2
R2
+5V
–5V
/
AD820/
OP295
R1
)
±5V