AD5641 Analog Devices, AD5641 Datasheet - Page 16

• Manufacturer Part Number: AD5641
• Description: 2.7 V to 5.5 V,
• Manufacturer: Analog Devices

Specifications of AD5641

• Resolution (bits): 14bit
• Dac Update Rate: 1.7MSPS
• Dac Settling Time: 6µs
• Max Pos Supply (v): +5.5V
• Single-supply: Yes
• Dac Type: Voltage Out
• Dac Input Format: Ser,SPI

AD5641
APPLICATIONS
CHOOSING A REFERENCE AS POWER SUPPLY FOR
THE AD5641
The AD5641 comes in tiny LFCSP and SC70 packages with less
than 100 μA supply current. Because of this, the choice of refer-
ence depends on the application requirement. For space-saving
applications, the
has excellent drift at 9 ppm/°C (3 ppm/°C in the R-8 package).
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, the parts are ideal for low supply applications.
The
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.
Table 7 lists some recommended precision references for use as
supplies to the AD5641.
Table 7. Precision References for Use with AD5641
Part No.
ADR435
ADR425
ADR02
ADR02
ADR395
INTERFACE
ADR395
SERIAL
3-WIRE
Initial
Accuracy
(mV max)
±2
±2
±3
±3
±5
Figure 43. ADR395 as Power Supply to AD5641
voltage reference is recommended in this case.
7V
SYNC
SCLK
SDIN
ADR02
ADR395
is available in an SC70 package and
Temperature
Drift
(ppm/°C max)
3 (R-8)
3 (R-8)
3 (R-8)
3 (SC70)
9 (TSOT-23)
5V
AD 5641
0.1 Hz to 10 Hz
Noise (μV p-p typ)
8
3.4
10
10
8
V
OUT
= 0V TO 5V
Rev. D | Page 16 of 20
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 44. The circuit in Figure 44 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
where D represents the input code in decimal (0 – 16384).
With 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.
+5V
V
V
OUT
OUT
DD
= 5 V, R1 = R2 = 10 kΩ,
10F


Figure 44. Bipolar Operation with the AD5641

 





V
10
16
DD
,

384
0.1F

AD820
D

 


 

16

V
,
D
DD
384
5
or
INTERFACE
R1 = 10k
V
AD5641
3-WIRE
SERIAL

 

OP295




R1
V
OUT
as the output amplifier.
R1

R2
R2 = 10k
AD820/
OP295



+5V
–5V

Data Sheet
V
DD




R2
R1
+5V






