Gradation Voltage Generating IC for Color TFT-LCD
AN1702FHK
Gray-scale voltage generating IC for liquid crystal display
I
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.
36
9.00
±0.20
7.00
±0.10
25
Unit: mm
(0.75)
37
24
I
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
48
13
0.50
(0.75)
0.10
M
(1.00)
0.15
±0.05
0.10
Seating plane
0° to 8°
0.50
±0.10
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Applications
•
Gray-scale power sources for LCDs
TQFP048-P-0707B (Lead-free package)
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Block Diagram
VB3
VB4
VB5
VB6
VB7
N.C.
GND2 VA7
VA6
VA5
VA4
VA3
36
VB2
37
35
34
33
32
31
30
29
28
27
26
25
VA2
24
VB1
L4
38
L5
VA1
23
VA0
R2
L6
VB0
39
22
N.C.
R1
GND1
40
REF
L7
R0
21
V
REF
N.C.
41
20
COM1
42
R7
VR
19
V
REF
18
N.C.
COM0
43
COM
L2
COMS
44
L0
R6
17
R5
V
CC1
VL0
45
L1
L3
N.C.
16
R4
N.C.
46
15
R3
VR0
VL1
47
14
VR1
VL2
48
1
2
3
4
5
6
7
8
9
10
11
12
13
VR2
VL3
VL4
VL5
VL6
VL7
N.C.
V
CC2
VR7
VR6
VR5
VR4
VR3
0.10
+0.10
-0.05
(1.00)
1.20 max.
1
12
0.20
±0.05
7.00
±0.10
9.00
±0.20
Publication date: December 2001
SDF00004BEB
1
AN1702FHK
I
Absolute Maximum Ratings
Parameter
Supply voltage
Supply current
Power dissipation
*2
Operating ambient temperature
*1
Strage temperature
*1
REF amplifier output source current
R0 amplifier output source current
R0 amplifier output sink current
R0, R1, R2, R3, R4, R5,
L5, L4, L3, L2, L1
amplifier output source current
R6, R7, L7, L6
amplifier output source current
R0, R1, R2, R3, R4, R5,
L5, L4, L3, L2, L1
amplifier output sink current
R6, R7, L7, L6
amplifier output sink current
L0 amplifier output source current
L0 amplifier output sink current
COM amplifier output source current
COM amplifier output sink current
REF amplifier maximum load capacitance
R0, R1, R2, R3, R4, R5, R6, R7,
L7, L6, L5, L4, L3, L2, L1, L0
amplifier maximum load capacitance
COM amplifier maximum load capacitance
Symbol
V
CC
I
CC
P
D
T
opr
T
stg
I
O
SOURCE
I
O
−R0
I
O
+R0
I
O
−R1-R5,
L1-L5
Rating
15.8
200
0 to
+75
−55
to
+125
−5
−15
0.05
−10
Unit
V
mA
mW
°C
°C
mA
mA
mA
mA
I
O−
R6-L6
I
O
+R1-R5,
L1-L5
−15
10
mA
mA
I
O+
R6-L6
I
O
−L0
I
O
+L0
I
O
−COM
I
O
+COM
C
O
REF
C
O
R/L
15
−
0.05
15
−100
100
0.2
0.1
mA
mA
mA
mA
mA
µF
µF
C
O
COM
10
µF
Note) 1. Do not apply external currents or voltages to any pins not specifically mentioned.
For circuit currents, '+' denotes current flowing into the IC, and '−' denotes current flowing out of the IC.
2. *1: Except for the power dissipation, operating ambient temperature and storage temperature, all ratings are for T
a
=
25°C.
*2:T
a
=
75°C. For the independent IC without a heat sink.
I
Recommended Operating Range
Parameter
Supply voltage
Load capacitance
R0 to L0
COM
REF
Symbol
V
CC
CLOAD
Range
7 to 15.5
0.01
0.1 to 1
0.1
Unit
V
µF
µF
µF
2
SDF00004BEB
AN1702FHK
I
Electrical Characteristics at T
a
=
25°C
Parameter
Circuit current
Reference voltage
Input bias current
REF amplifier block
Operating upper limit voltage
Operating lower limit voltage
R0 amplifier block
Output upper limit voltage 1
Output upper limit voltage 2
Output lower limit voltage
Offset voltage
R1 amplifier block
Output upper limit voltage
Output lower limit voltage
Offset voltage
R2 amplifier block
Output upper limit voltage
Output lower limit voltage
Offset voltage
V
H
R2
V
L
R2
V
OFF
R2
V
H
R3-R5
V
H
R6-R7
V
L
R3-R5
V
L
R6-R7
V
H
L3-L5
V
H
L6-L7
V
L
L3-L5
V
L
L6-L7
V
OFF
34567
I
OUT
= −10
mA
I
OUT
= −15
mA
I
OUT
=
10 mA
I
OUT
=
15 mA
I
OUT
= −10
mA
I
OUT
= −15
mA
I
OUT
=
10 mA
I
OUT
=
15 mA
I
OUT
= −10
mA
I
OUT
=
10 mA
V
CC
−
0.7
V
CC
−
1.2
V
CC
−
1.2
V
CC
−
2.0
V
CC
−
2.0
V
CC
/ 2
10
2
2
1.2
1.2
10
V
V
mV
V
H
R1
V
L
R1
V
OFF
R1
I
OUT
= −10
mA
I
OUT
=
10 mA
V
CC
−
0.3
V
CC
/ 2
10
V
V
mV
V
H
R01
V
H
R02
V
L
R0
V
OFF
R0
I
OUT
= −10
mA
I
OUT
= −15
mA
I
OUT
=
0.05 mA
V
CC
−
0.2
V
CC
−
0.23
V
CC
−
3.0
10
V
V
V
mV
V
H
VL
I
OUT
= −2
mA, C
OUT
≥
0.1
µF
COUT
≥
0.1
µF
V
CC
−
0.2
V
REF
V
V
Symbol
I
CC
V
REF
I
B
Conditions
Min
1.19
Typ
1.23
Max
10
1.27
500
Unit
mA
V
nA
R3, R4, R5, R6, R7, L3, L4, L5, L6, L7 amplifier block
Output upper limit voltage 1
Output upper limit voltage 2
Output lower limit voltage 1
Output lower limit voltage 2
Output upper limit voltage 3
Output upper limit voltage 4
Output lower limit voltage 3
Output lower limit voltage 4
Offset voltage
V
V
V
V
V
V
V
V
mV
SDF00004BEB
3
AN1702FHK
I
Electrical Characteristics at T
a
=
25°C (continued)
Parameter
L2 amplifier block
Output upper limit voltage
Output lower limit voltage
Offset voltage
L1 amplifier block
Output upper limit voltage
Output lower limit voltage
Offset voltage
L0 amplifier block
Output upper limit voltage
Output lower limit voltage
Offset voltage
COM amplifier block
Output upper limit voltage
Output lower limit voltage
Offset voltage
V
H
COM
V
L
COM
I
OUT
= −100
mA
I
OUT
=
100 mA
V
CC
−2.5
2.5
10
V
V
mV
V
H
L0
V
L
L0
V
OFF
L0
I
OUT
= −
0.05 mA
I
OUT
=
15 mA
3
0.15
10
V
V
mV
V
H
L1
V
L
L1
V
OFF
L1
I
OUT
= −10
mA
I
OUT
=
10 mA
V
CC
/ 2
0.25
10
V
V
mV
V
H
L2
V
L
L2
V
OFF
L2
I
OUT
= −10
mA
I
OUT
=
10 mA
V
CC
/ 2
0.7
10
V
V
mV
Symbol
Conditions
Min
Typ
Max
Unit
V
OFF
COM
V
IN
=
5 V
I
Technical Data
•
P
D
T
a
curves of TQFP048-P-0707B
P
D
T
a
900
800
772
700
Mounted on standard board
(glass epoxy: 50 mm
×
50 mm
×
t0.8 mm)
R
th(j-a)
=
129.5°C/W
Power dissipation P
D
(mW)
600
500
400
399
300
200
100
0
0
25
50
75
100
125
Independent IC
without a heat sink
R
th(j-a)
=
250.6°C/W
Ambient temperature T
a
(°C)
4
SDF00004BEB
AN1702FHK
I
Application Circuit Example
•
System configuration example
COM amplifier
16
source driver
VR0
VR1
VR2
AN1702FHK
VL2
VL1
VL0
Liquid crystal panel
Display data
H, V, CLK
Data
Display controllor
Control signal
Control signal
•
Application circuit example
V
REF
output voltage
=
1.23 V
×
R
1
+
R
2
(but this never exceeds V
CC
)
R
1
Output current
±100
mA (max.)
To the reference voltage pin of LSI
COMS
V
CC1
V
CC2
Output V
REF
1.23 V
VA1
VA7
VB7
VB0
Current
Total current should be
lower than 5 mA.
Current
SDF00004BEB
COM1
VB6
VA0
R
2
R
1
COM0
VR0
VR1
VR7
VL7
VL6
VL0
Gate driver
5
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