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ADM8840ACP Datenblatt(PDF) 9 Page - Analog Devices

Teilenummer ADM8840ACP
Bauteilbeschribung  Charge Pump Regulator & COM Driver for Color TFT Panel
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ADM8840
–9–
REV. PrG
2/03
PRELIMINARY TECHNICAL DATA
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.
SERIAL
INTERFACE
VREF
DAC 1
DAC 2
8
8
CLK
DATA
CS / LDAC
LEVEL
TRANSLATOR
PO WER
BUFFER
+
-
-
+
COM_IN
4.7 F
4.7 F
C PANEL
5k
4.7 F
OSCILLATOR
CONTROL
LOGIC
TIMING
GENERATOR
SHUTDOWN
CONTROL
DISCHARGE
VOLTAGE
DOUBLER
C1+
C1-
SHDN
VCC
LDO
VOLTAGE
REGULATOR
5VOUT
2.2 F
C7
DOUBLE
TRIPLE
VOLTAGE
TRIPLER
VOLTAGE
INVERTER
C2+
C2-
C3+
C3-
VOUT
VOLTAGE
ADDER
C5+
C5-
+15V
C4+
C4-
-15V
ADM8840
0.22 F
3.3 F
3.3 F
3.3 F
0.22 F
0.22 F
0.22 F
0.22 F
DAC1_SD
DAC1_IN
INT/EXT
DAC 1
INT/EXT
DAC 2
DAC2_SD
DAC2_IN
C4
C2
C3
C9
C8
ADD_OUT
TRANS_OUT
COM_OUT_AC
COM_OUT
GND
C5
C10
C11
C12
C13
4.7 F
C6
C1
22nF
5VIN
+5V
Current Boost
Configuration
Connection
Figure 5. Typical Configuration
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.
SERIAL
INTERFACE
VREF
DAC 1
DAC 2
8
8
CLK
DATA
CS / LDAC
LEVEL
TRANSLATOR
PO WER
BUFFER
+
-
-
+
COM_IN
4.7 F
4.7 F
C PANEL
5k
4.7 F
OS CILLATOR
CONTROL
LOGIC
TIMING
GENERATOR
SHUTDOWN
CONTROL
DISCHARGE
VOLTAGE
DOUBLER
C1+
C1-
SHDN
VCC
LDO
VOLTAGE
REGULATOR
5VOUT
2.2 F
C7
DOUBLE
TRIP LE
VOLTAGE
TRIPLER
VOLTAGE
INVERTER
C2+
C2-
C3+
C3-
VOUT
VOLTAGE
ADDER
C5+
C5-
+15V
C4+
C4-
-15V
ADM8840
0.22 F
3.3 F
3.3 F
3.3 F
0.22 F
0.22 F
0.22 F
0.22 F
DAC1_SD
DAC1_IN
INT/EXT
DAC 1
INT/EXT
DAC 2
DAC2_SD
DAC2_IN
C4
C2
C3
C9
C8
ADD_OUT
TRANS_OUT
COM_OUT_AC
COM_OUT
GND
C5
C10
C11
C12
C13
4.7 F
C6
C1
22nF
5VIN
+5V
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
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).


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