Gradation Voltage Generating IC for Color TFT-LCD
1
Publication date: December 2001 SDF00004BEB
AN1702FHK
Gray-scale voltage generating IC for liquid crystal display
a73 Overview
The AN1702FHK has been designed for LCD
applications,and features built-in functions such as a
gray-scale voltage generatior that supports 256 grada-
tions, a reference voltage of 1.23 V, 16 output buffer amp
circuits and a COM amplifier circuit.
a73 Features
• Built-in 1.23 V (typical) high-precision reference voltage
power source
• Wide buffer amp. dynamic range output: V
CC
− 0.2 V
(top stage) to GND + 0.15 V (bottom stage)
• Large ±100 mA (max.) COM amp. driving current
a73 Applications
• Gray-scale power sources for LCDs
a73 Block Diagram
Unit: mm
TQFP048-P-0707B (Lead-free package)
0.15
±
0.05
0.50±0.10
0.20±0.05
9.00±0.20
7.00±0.10
7.00
±
0.10
9.00
±
0.20
0.10
+0.10 -
0.05
0° to 8°
1.20 max.
(0.75)
(1.00)
(0.75)
(1.00)
Seating plane
37
1348
1 12
36
24
25
0.50
M0.10
0.10
36 3435 33 32 2931 30 28 27 26 25
24
23
22
21
20
19
18
17
16
15
14
13
121110987654321
VB3 VB4 VB5 VB6 VB7 N.C. GND2 VA7 VA6 VA5 VA4 VA3
VA 2
VA 1
VA 0
N.C.
V
REF
VR
N.C.
V
CC1
N.C.
VR0
VR1
VR2
VL3 VL4 VL5 VL6 VL7 N.C. V
CC2
VR7 VR6 VR5 VR4 VR3
VB2
VB1
VB0
GND1
N.C.
COM1
COM0
COMS
VL0
N.C.
VL1
VL2
48
47
46
45
44
42
41
40
39
38
37
43
L4
L5
L6
L7
R2
R1
R0
R7
R6
R5
R4
R3
V
REF
REF
L2
L3L1
L0
COM