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AD5601 Datasheet(PDF) 18 Page - Analog Devices

No. de Pieza. AD5601
Descripción  2.7 V to 5.5 V, <100 μA, 8-/10-/12-Bit nanoDAC
Descarga  24 Pages
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Fabricante  AD [Analog Devices]
Página de inicio  http://www.analog.com
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AD5601 Datasheet(HTML) 18 Page - Analog Devices

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AD5601/AD5611/AD5621
Data Sheet
Rev. F | Page 18 of 24
APPLICATIONS
CHOOSING A REFERENCE AS POWER SUPPLY FOR
THE AD5601/AD5611/AD5621
The AD5601/AD5611/AD5621 come in tiny LFCSP and SC70
packages with less than a 100 µA supply current. Because of
this, the choice of reference depends on the application
requirements. For applications with space-saving requirements,
the ADR02 is recommended. It is available in an SC70 package
and has excellent drift at 9 ppm/°C (3 ppm/°C in the R-8 package)
and 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 AD5601/AD5611/
AD5621 is extremely low, the parts are ideal for low supply
applications. The ADR395 voltage reference is recommended in
this case. It requires less than 100 µA of quiescent current and
can, therefore, drive multiple DACs in one system, if required. It
also provides very good noise performance at 8 µV p-p in the
0.1 Hz to 10 Hz range.
Figure 51. ADR395 as Power Supply to the AD5601/AD5611/AD5621
Some recommended precision references for use as supplies to
the AD5601/AD5611/AD5621 are listed in Table 7.
Table 7. Precision References for the AD5601/AD5611/AD5621
Part No.
Initial
Accuracy
(mV max)
Temp Drift
(ppm/°C max)
0.1 Hz to 10 Hz
Noise (µV p-p typ)
ADR435
±2
3 (R-8)
8
ADR425
±2
3 (R-8)
3.4
ADR02
±3
3 (R-8)
10
ADR02
±3
3 (SC70)
10
ADR395
±5
9 (TSOT-23)
8
BIPOLAR OPERATION USING THE
AD5601/AD5611/AD5621
The AD5601/AD5611/AD5621 have been designed for single-
supply operation, but a bipolar output range is also possible
using the circuit shown in Figure 52. The circuit in Figure 52
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.
Figure 52. Bipolar Operation with the AD5601/AD5611/AD5621
The output voltage for any input code can be calculated as


×
+
×
×
=
R1
R2
V
R1
R2
R1
D
V
V
DD
N
DD
OUT
2
where D represents the input code in decimal (0 – 2N).
With VDD = 5 V, R1 = R2 = 10 kΩ
V
5
2
10
×
=
N
OUT
D
V
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.
3-WIRE
SERIAL
INTERFACE
SYNC
SCLK
SDIN
7V
5V
VOUT = 0V TO 5V
ADR395
AD5601/AD5611/
AD5621
R2 = 10kΩ
+5V
–5V
AD820/
OP295
3-WIRE
SERIAL
INTERFACE
+5V
AD5601/AD5611/
AD5621
10µF
0.1µF
V
DD
V
OUT
R1 = 10kΩ
+5V


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