參數(shù)資料
型號： AD5259BCPZ100-R7
廠商： ANALOG DEVICES INC
元件分類： 數(shù)字電位計(jì)
英文描述： Nonvolatile, I2C-Compatible 256-Position, Digital Potentiometer
中文描述： 100K DIGITAL POTENTIOMETER, 2-WIRE SERIAL CONTROL INTERFACE, 256 POSITIONS, DSO10
封裝： 3 X 3 MM, 0.80 MM HEIGHT, LEAD FREE, LFCSP-10
文件頁數(shù)： 20/24頁
文件大?。?/td> 1039K
代理商： AD5259BCPZ100-R7
AD5259
DISPLAY APPLICATIONS
CIRCUITRY
A special feature of the AD5259 is its unique separation of the
V
LOGIC
and V
DD
supply pins. The separation provides greater
flexibility in applications that do not always provide needed
supply voltages.
Rev. A | Page 20 of 24
In particular, LCD panels often require a V
COM
voltage in the
range of 3 V to 5 V. The circuit in Figure 46 is the rare excep-
tion in which a 5 V supply is available to power the digital
potentiometer.
0
A
B
W
R2
10k
Ω
R1
70k
Ω
R3
25k
Ω
V
DD
V
LOGIC
SCL
SDA
GND
–
+
U1
AD8565
3.5V < V
COM
< 4.5V
14.4V
VCC (~3.3V)
5V
AD5259
MCU
C1
1
μ
F
R5
10k
Ω
R6
10k
Ω
Figure 46. V
COM
Adjustment Application
In the more common case shown in Figure 47, only analog 14.4 V
and digital logic 3.3 V supplies are available. By placing discrete
resistors above and below the digital potentiometer, V
DD
can
now be tapped off the resistor string itself. Based on the chosen
resistor values, the voltage at V
DD
in this case equals 4.8 V,
allowing the wiper to be safely operated all the way up to 4.8 V.
The current draw of V
DD
will not affect that node’s bias because
it is only on the order of microamps. V
LOGIC
is tied to the MCU’s
3.3 V digital supply because V
LOGIC
will draw the 35 mA which
is needed when writing to the EEPROM. It would be imprac-
tical to try and source 35 mA through the 70 kΩ resistor,
therefore, V
LOGIC
is not connected to the same node as V
DD
.
For this reason, V
LOGIC
and V
DD
are provided as two separate
supply pins that can either be tied together or treated inde-
pendently; V
LOGIC
supplying the logic/EEPROM with power,
and V
DD
biasing up the A, B, and W terminals for added
flexibility.
0
A
B
W
R2
10k
Ω
R1
70k
Ω
R3
25k
Ω
V
DD
V
LOGIC
SCL
SDA
GND
–
+
U1
AD8565
3.5V < V
COM
< 4.5V
14.4V
VCC (~3.3V)
AD5259
MCU
C1
1
F
R5
10k
Ω
R6
10k
Ω
SUPPLIES POWER
TO BOTH THE
LOGIC SUPPLY OF
THE DIGITAL POT
Figure 47. Circuitry When a Separate Supply is Not Available for V
DD
For a more detailed look at this application, refer to the article,
“Simple VCOM Adjustment uses any Logic Supply Voltage” in
the September 30, 2004 issue of
EDN
magazine.
相關(guān)PDF資料
PDF描述
AD5259 18 Bit, 1.25MSPS Single Channel Delta-Sigma ADC Single with FIFO 64-HTQFP -40 to 105
AD5259BRMZ5 Nonvolatile, I2C-Compatible 256-Position, Digital Potentiometer
AD5259BRMZ5-R7 18 Bit, 1.25MSPS Single Channel Delta-Sigma ADC Single with FIFO 64-HTQFP -40 to 105
AD5259BRMZ50 Nonvolatile, I2C-Compatible 256-Position, Digital Potentiometer
AD5259BRMZ50-R7 Nonvolatile, I2C-Compatible 256-Position, Digital Potentiometer
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