MN838898 PANASONIC [Panasonic Semiconductor], MN838898 Datasheet - Page 9

• Manufacturer Part Number: MN838898
• Description: CMOS LSI source driver for color TFT LCD panels
• Manufacturer: PANASONIC [Panasonic Semiconductor]

MN838898
6.8 Relationship between Input Data and Output Voltage
Figure 6.8.1
Built-In Gamma Adjustment Resistors
6.8.1 Built-In Gamma Adjustment Resistors
V
V
V
V
V
V
V
V
V
V
V
The output voltage depends on the input data and thirteen gamma adjustment voltages
REF 10
(V
REF 0
REF 1
REF 2
REF3
REF 4
REF5
REF 6
REF 7
REF8
REF 9
REF x
, x = H, 0 to 10, L). See graph and conversion table on the next two pages.
Inside LSI
R4
R5
R6
R0
R1
R2
R3
R7
R8
R9
SDF00030AEM
The LSI contains ten divider resistances and two switches
between V
formulas for calculating the output voltages from the
voltages applied to pins V
voltages only to V
graph shown in Figure 6.8.2.
Note that we recommend the use of an operational
amplifier or similar means to guarantee low-impedance
input to the V
Direct input sometimes fails to produce the desired output
voltages.
The following are the values for the internal resistances
R0 to R9 for R2=1.0.
The adjustment voltages (V
satisfy one of the following two relationships.
Do not change these voltages while the chip is in
operation.
(Note 1)
or
AV
AV
DD
DD
Gamma Adjustment Resistances
REGF0
V
V
REF
REF0
REF10
R0
R1
R2
R3
R4
R5
R6
R7
R8
R9
and V
pins.
REF0
・・・・ V
・・・・ V
V
V
REGF10
and V
REF1
REF9
REF x
REF x
REF 9
. Table 6.8 summarizes the
REF1
REF10
V
, x = 0 to 10. Applying
V
, x = H, 0 to 10) must
1.15
1.09
1.00
1.00
1.00
1.00
1.00
1.00
1.09
1.15
REF2
REF8
produces the default
V
V
REF L10
REF0
・・・・
・・・・
AV
AV
SS
SS
9