" />
參數(shù)資料
型號(hào)： EVAL-AD5258DBZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 13/24頁(yè)
文件大?。?/td> 0K
描述： BOARD EVAL FOR AD5258DBZ
標(biāo)準(zhǔn)包裝： 1
系列： *
AD5258
Data Sheet
Rev. D | Page 20 of 24
DISPLAY APPLICATIONS
CIRCUITRY
A special feature of the AD5258 is its unique separation of
the VLOGIC and VDD supply pins. The reason for doing this is
to provide greater flexibility in applications that do not always
provide the 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 43 is the rare
exception in which a 5 V supply is available to power the
digital potentiometer.
05029-
045
A
B
W
R2
10kΩ
R1
70kΩ
R3
25kΩ
VDD
VLOGIC
SCL
SDA
GND
–
+
U1
AD8565
3.5V < VCOM < 4.5V
14.4V
VCC (~3.3V)
5V
AD5258
MCU
C1
1F
R5
10kΩ
R6
10kΩ
Figure 43. VCOM Adjustment Application
More commonly, only analog 14.4 V and digital logic 3.3 V sup-
plies are available (see Figure 44). By placing discrete resistors
above and below the digital potentiometer, VDD can 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 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 microcontroller’s (MCU) 3.3 V
digital supply because VLOGIC will draw the 35 mA that is needed
when writing to the EEPROM. It would be impractical to try to
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 supplies the logic/EEPROM with power, and
VDD biases up the A, B, and W terminals for added flexibility.
05029-
046
A
B
W
R2
10kΩ
R1
70kΩ
R3
25kΩ
VDD
VLOGIC
SCL
SDA
GND
–
+
U1
AD8565
3.5V < VCOM < 4.5V
14.4V
VCC (~3.3V)
AD5258
MCU
C1
1F
R5
10kΩ
R6
10kΩ
SUPPLIES POWER
TO BOTH THE MCU
AND THE LOGIC
SUPPLY OF THE
DIGITAL
POTENTIOMETER
Figure 44. 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.
相關(guān)PDF資料
PDF描述
SRR1240-4R7M INDUCTOR POWER 4.7UH 6A SMD
EET-UQ2W151CA CAP ALUM 150UF 450V 20% SNAP
GCM18DRYH-S13 CONN EDGECARD 36POS .156 EXTEND
EVAL-AD5247DBZ BOARD EVAL FOR AD5247DBZ
EEM43DSEN-S13 CONN EDGECARD 86POS .156 EXTEND
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
EVAL-AD5259DBZ 功能描述:BOARD EVAL FOR AD5259DBZ RoHS:否 類(lèi)別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估演示板和套件 系列:* 標(biāo)準(zhǔn)包裝:1 系列:- 主要目的:電信，線路接口單元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要屬性:T1/J1/E1 LIU 次要屬性:- 已供物品:板，電源，線纜，CD 其它名稱(chēng):82EBV2081
EVAL-AD5262EBZ 功能描述:BOARD EVAL FOR AD5262 RoHS:是 類(lèi)別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估演示板和套件 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 主要目的:電信，線路接口單元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要屬性:T1/J1/E1 LIU 次要屬性:- 已供物品:板，電源，線纜，CD 其它名稱(chēng):82EBV2081
EVAL-AD5263EBZ 功能描述:BOARD EVAL AD5263 RoHS:是 類(lèi)別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估演示板和套件 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 主要目的:電信，線路接口單元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要屬性:T1/J1/E1 LIU 次要屬性:- 已供物品:板，電源，線纜，CD 其它名稱(chēng):82EBV2081
EVAL-AD5270SDZ 功能描述:BOARD EVAL FOR AD5270 RoHS:是 類(lèi)別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估演示板和套件 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 主要目的:電信，線路接口單元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要屬性:T1/J1/E1 LIU 次要屬性:- 已供物品:板，電源，線纜，CD 其它名稱(chēng):82EBV2081
EVAL-AD5272SDZ 功能描述:BOARD EVAL FOR AD5272 RoHS:是 類(lèi)別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估演示板和套件 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 主要目的:電信，線路接口單元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要屬性:T1/J1/E1 LIU 次要屬性:- 已供物品:板，電源，線纜，CD 其它名稱(chēng):82EBV2081
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*