UPD160040A NEC, UPD160040A Datasheet - Page 6

• Manufacturer Part Number: UPD160040A
• Description: 384-OUTPUT TFT-LCD SOURCE DRIVER
• Manufacturer: NEC

5. RELATIONSHIP BETWEEN INPUT DATA AND OUTPUT VOLTAGE VALUE
respectively gray scale voltages of differing polarity with respect to the LCD’s counter electrode voltage. The D/A
converter consists of ladder resistors and switches.
and V
V
0.5 V
to the all pins, as V
between the input data and the output voltage (POL21, POL22 = L).
6
The PD160040A incorporates a 8-bit D/A converter whose odd output pins and even output pins output
The ladder resistors (r0 to r253) are designed so that the ratio of LCD panel ( -compensated voltages to V
Figure 5 1 shows the relationship between the driving voltages such as liquid-crystal driving voltages V
Also, V
Figures 5 2 shows -Corrected Voltages and Ladder Resistors Ratio and figure 5 3 shows the relation ship
0
-V
7
DD2
0
and V
”-V
, and -corrected voltages V
6
-V
255
0.2 V
0.2 V
0.5 V
0.5 V
7
8
” is almost equivalent as shown in Figure 5 2. For the 2 sets of eight -compensated power supplies,
-V
and V
V
0.5 V
15
0.5 V
DD2
, respectively, input gray scale voltages of the same polarity with respect to the 0.5 V
Figure 5 1. Relationship between Input Data and -corrected Power Supplies
V
V
8
–0.2 V
0
DD2
V
V
V
V
V
V
DD2
V
V
V
V
SS2
V
V
V
V
V
-V
DD2
V
-V
0
5
6
8
10
11
12
13
14
15
1
2
3
4
7
9
9
15
–0.5 V
are left open in the IC. Be sure to input the gray scale level power supply at a constant level
.
00
01
V
0
> V
V
8
1
> V
20
> V
0
-V
9
2
> V
15
> V
and the input data. Be sure to maintain the voltage relationships below.
10
40
3
> V
> V
Data Sheet S15918EJ1V0DS
11
4
> V
> V
5
12
> V
Input data (HEX)
> V
6
13
> V
> V
80
7
14
0.5 V
> V
15
DD2
0.5 V
+0.5 V
C0
SS2
+0.2 V
F0
www.DataSheet4U.com
FF
DD2
PD160040A
.
DD2
15
48
64
64
32
31
31
32
64
64
48
15
, V
0
’-V
SS2
255
and
’