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AD7376ARWZ50 Datasheet(PDF) 16 Page - Analog Devices

Part # AD7376ARWZ50
Description  128-Position Digital Potentiometer
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7376ARWZ50 Datasheet(HTML) 16 Page - Analog Devices

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AD7376
Rev. D | Page 16 of 20
APPLICATIONS INFORMATION
HIGH VOLTAGE DAC
The AD7376 can be configured as a high voltage DAC as high
as 30 V. The circuit is shown in Figure 32. The output is


 
1
2
1
V
2
.
1
128
)
(
R
R
D
D
V
O
(5)
Where D is the decimal code from 0 to 127.
AD7376
U2
AD8512
V+
V–
AD8512
VOUT
VDD
U1B
VDD
RBIAS
ADR512
D1
R2
R1
B
100kΩ
U1A
Figure 32. High Voltage DAC
PROGRAMMABLE POWER SUPPLY
With a boost regulator such as ADP1611, AD7376 can be used
as the variable resistor at the regulator’s FB pin to provide the
programmable power supply (see Figure 33). The output is
2
128
1
V
23
.
1
R
R
D
V
AB
O
(6)
Note that the AD7376’s VDD is derived from the output. Initially
L1 acts as a short, and VDD is one diode voltage drop below +5 V.
The output slowly establishes to the final value.
The AD7376 shutdown sleep-mode programming can be used
to program a desirable preset level at power-up.
AD7376
ADP1611
1.23V
CC
150pF
RC
220kΩ
COUT
10µF
VOUT
D1
L1
4.7µF
IN
GND
SS
FB
RT
SW
COMP
U2
C1
0.1µF
VDD
R1
100kΩ
A
W
B
CIN
10µF
5V
R2
8.5kΩ
CSS
22nF
U1
SD
Figure 33. Programmable Power Supply


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