ADM8840 데이터 시트보기 (PDF) - Analog Devices

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ADM8840

Charge Pump Regulator & COM Driver for Color TFT Panel

Analog Devices 

PRELIMINARY TECHNICAL DATA

ADM8840

BOOSTING THE CURRENT DRIVE OF THE +/-15V

SUPPLY

The ADM8840 +/-15V output can deliver 100uA of

current in the typical configuration, as shown in Figure

5.

In this configuration the 5Vout (pin 4) is connected to

5Vin (pin 5), as can be seen on block diagram Page 1 of

this data sheet.

SHDN

C6

4.7␮ F

VCC

DAC1_IN

D AC1 _S D

ADM8840

OS CI L L AT O R

TIMING

G E N E R A T OR

S H UT D OW N

CON T RO L

DI S C HA RG E

CONTROL

LOGIC

VOLTAGE

IN VE RT ER

TRIP LE

VOLTAGE

TRIPLER

DOUBLE

LDO

VOLTAGE

RE G UL ATO R

V OL T AG E

DOUBLER

V O LT AGE

ADDER

C4+

C4

0.22␮F

C4-

C2+

C2

0.22␮F

C2-

C3+

C3

0. 2 2␮ F

C3-

-15V

C9 0.22␮F

+15V

C8 0.22␮F

5VIN

5V O UT

+5V

C7 2.2␮F

C1+

C1

3.3␮F

C 1-

VOUT

C10

3.3␮F

C5+

C5

3.3␮F

C5-

It is possible to configure the ADM8840 to supply up to

400uA on the +/-15V outputs, by changing its

configuration slightly, as shown in Figure 6.

ADM8840

SHDN

OS C IL L ATO R

TIMING

G EN E R A T OR

S H UT D O WN

CON T RO L

D IS C H A RG E

C6

4 .7␮ F

VCC

DAC1_IN

DAC1_SD

VREF

CLK

D ATA

CS / LDAC

8

S ER IA L

IN T E RF AC E

8

DAC 1

DAC 2

COM_IN

DAC2_SD

DAC 2_ IN

CO NTROL

LOGIC

INT/EXT

DAC 1

IN T / EX T

DAC 2

V OL T AG E

INV E RT E R

T R IP L E

VOLTAGE

TRIPLER

DOUBLE

LDO

V OL T AG E

RE GULAT OR

VO LT AGE

DO UB L ER

V O L T AG E

AD DER

-15V

C4+

C4

0.22␮F

C4-

C9 0.22␮F

+15V

C2+

C2

0.22␮F

C2-

C3+

C3

0. 22␮ F

C3-

5VIN

C8 0.22␮F

Current Boost

Configuration

Connection

+5V

5V O UT

C7 2.2␮F

C1+

C1

3.3␮F

C 1-

V OU T

C10

3.3␮F

C5+

C5

3.3␮F

C5-

ADD _O UT

C11

+

4.7␮F

-

LE VE L

T R AN SL AT O R

POWER

BU F FE R

TR AN S _ OUT

C12

4.7␮F

C O M _ O U T _ AC

C13

4.7␮F

+

COM_OUT

-

5k⍀

C PANEL

22nF

VREF

CLK

D ATA

CS / LDAC

8

SERIAL

INTERFACE

8

DAC 1

DAC 2

CO M _I N

DAC2_SD

D AC 2_I N

ADD _ OUT

C11

GND

IN T /E XT

+

4.7␮F

DAC 1

INT/EXT

DAC 2

-

LEVEL

TRANSLATOR

POWER

BUFFER

T R AN S_ O UT

C12

4.7␮F

C OM _ OU T _AC

C13

4.7␮F

Figure 6. Current Boost Configuration

The configuration in Figure 6, can supply up to 400uA of

current on both the +15V and the -15V outputs. If the

+

-

5k⍀

C OM _ OU T

CPANEL

22nF

load on the +/-15V does not draw any current the voltage

on the +/-15V outputs can rise up to +/-16.5V.In this

configuration Vout (pin 3) is connected to 5Vin (pin 5).

GND

Figure 5. Typical Configuration

REV. PrG 2/03

–9–

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