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AD5641 Datasheet(PDF) 15 Page - Analog Devices

Part # AD5641
Description  2.7 V to 5.5 V, <100 uA, 14-Bit nanoDAC D/A in SC70 Package
PDF  20 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD5641 Datasheet(HTML) 15 Page - Analog Devices

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Preliminary Technical Data
AD5641
Rev. PrC | Page 15 of 20
APPLICATIONS
CHOOSING A REFERENCE AS POWER SUPPLY FOR
AD5641
The AD5641 comes in a tiny SC70 package with less than a
100 µA supply current. Because of this, the choice of reference
depends on the application requirements. For space-saving
applications, the ADR425 is available in an SC70 package and
has excellent drift at 3 ppm/°C. It also provides very good noise
performance at 3.4 µV p-p in the 0.1 Hz to 10 Hz range.
Because the supply current required by the AD5641 is extremely
low, it is ideal for low supply applications. The ADR293 voltage
reference is recommended in this case. This requires 15 µA of
quiescent current and can, therefore, drive multiple DACs in
one system, if required.
AD 5641
3-WIRE
SERIAL
INTERFACE
SYNC
SCLK
DIN
7V
5V
VOUT = 0V TO 5V
ADR425
Figure 34. ADR425 as Power Supply to AD5641
Some recommended precision references for use as supplies to
the AD5641 are listed in Table 7.
Table 7. Precision References for Use with AD5641
Part
No.
Initial
Accuracy
(mV max)
Temperature
Drift
(ppm/°C max)
0.1 Hz to 10 Hz
Noise (µV p-p typ)
ADR435
±6
3
3.4
ADR425
±6
3
3.4
ADR02
±5
3
15
ADR395
±6
25
5
BIPOLAR OPERATION USING THE AD5641
The AD5641 has been designed for single-supply operation, but
a bipolar output range is also possible using the circuit in
Figure 35. The circuit in Figure 35 gives an output voltage range
of ±5 V. Rail-to-rail operation at the amplifier output is
achievable using an AD820 or OP295 as the output amplifier.
The output voltage for any input code can be calculated as
follows:
⎥⎦
⎤
⎢⎣
⎡
⎟
⎠
⎞
⎜
⎝
⎛
×
−
⎟
⎠
⎞
⎜
⎝
⎛
+
×
⎟
⎠
⎞
⎜
⎝
⎛
×
=
1
1
2
1
16384
R
2
R
V
R
R
R
D
V
V
DD
DD
O
where D represents the input code in decimal (0 – 16384). With
VDD = 5 V, R1 = R2 = 10 kΩ:
V
5
16384
10
−
⎟
⎠
⎞
⎜
⎝
⎛ ×
=
D
VO
This is an output voltage range of ±5 V with 0x0000 corre-
sponding to a –5 V output, and 0x3FFF corresponding to a
+5 V output.
R2 = 10k
Ω
+5V
–5V
AD820/
OP295
3-WIRE
SERIAL
INTERFACE
+5V
AD5641
10
µF
0.1
µF
V
DD
V
OUT
R1 = 10k
Ω
5V
Figure 35. Bipolar Operation with the AD5641



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