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| 型号： | EVAL-AD5259DBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 13/24页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD5259DBZ |
| 标准包装： | 1 |
| 系列： | * |
AD5259
Data Sheet
Rev. C | Page 20 of 24
DISPLAY APPLICATIONS
CIRCUITRY
A special feature of the AD5259 is its unique separation of the
VLOGIC and VDD supply pins. The separation provides greater
flexibility in applications that do not always provide needed
supply voltages.
In particular, LCD panels often require a VCOM 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.
05026-006
A
B
W
R2
10k
R1
70k
R3
25k
VDD
VLOGIC
SCL
SDA
GND
–
+
U1
AD8565
3.5V < VCOM < 4.5V
14.4V
VCC (~3.3V)
5V
AD5259
MCU
C1
1
F
R5
10k
R6
10k
Figure 46. VCOM 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,
VDD can now be tapped off the resistor string itself. Based on the
chosen resistor values, the voltage at VDD 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 VDD will not affect that node’s bias
because it is only on the order of microamps. VLOGIC is tied to
the MCU’s 3.3 V digital supply because VLOGIC will draw the 35
mA which is needed when writing to the EEPROM. It would be
impractical to try and source 35 mA through the 70 k resistor,
therefore, VLOGIC is not connected to the same node as VDD.
For this reason, VLOGIC and VDD are provided as two separate
supply pins that can either be tied together or treated inde-
pendently; VLOGIC supplying the logic/EEPROM with power,
and VDD biasing up the A, B, and W terminals for added
flexibility.
05026-007
A
B
W
R2
10k
R1
70k
R3
25k
VDD
VLOGIC
SCL
SDA
GND
–
+
U1
AD8565
3.5V < VCOM < 4.5V
14.4V
VCC (~3.3V)
AD5259
MCU
C1
1
F
R5
10k
R6
10k
SUPPLIES POWER
TO BOTH THE
MICRO AND THE
LOGIC SUPPLY OF
THE DIGITAL POT
Figure 47. Circuitry When a Separate Supply is Not Available for VDD
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.
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