TA8696F
TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic
TA8696F
γ
Correction IC for LCD TV
TA8696F operates with a power supply voltage of 3.3 to 7.5 V
and can be directly driven with a dry battery.
Features
·
·
·
·
·
·
Enables high-precision
γ
correction using logarithmic
compression.
γ
correction for normally white LCD panel is possible.
Offset/cancel input circuit enables high-quality
γ
correction
without distorting the primary color input signals.
Cut-off voltage and drive voltage can be independently
controlled.
Unsusceptible to negative effects of fluctuation of power
supply voltage.
Either latch mode or through mode can be selected using the CH display mode switching pin.
Weight: 0.63 g (typ.)
Block Diagram
(+13 V)
H.V
CC
F.F. Output
HD
VD
Cutoff
V
O
Center
Output
B
G
23
Output Amp
R
22
F.F. H.GND
Control
21
20
19
18
B
G
Input offset
COM control
CP
28
27
26
25
30
29
24
17
16
Pulse Modulation
F.F.
Current Conversion
Polarity Switching
Level Control
Input Detection
CH Display Switching
g
Correction
Input Latch
1
2
B
3
G
4
R
BS/H
5
6
B
Offset, Cancel
7
G
Input
8
R
9
L.GND
RS/H
V
ref
B
G
Drive
COM L.V
CC
(+4 V)
10
11
Current Conversion
Reference Voltage
Current Conversion
12
13
14
15
Channel Mode Channel Input
1
2002-02-13
TA8696F
Pin Function
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Pin Name
Mode Switch
CH B Input
CH G Input
CH R Input
BS/H
B Input
G Input
R Input
L.GND
RS/H
V
ref
B Drive
R Drive
COM Drive
L.V
CC
g
Offset
COM Cut-off
R Cut-off
B Cut-off
H.GND
F.F. CONT.
R Output
G Output
B Output
V
O
Center
H.V
CC
F.F. Output
CP
VD
HD
Reference
Voltage
(V)
0
0
0
0
1.6
1.6
1.6
1.6
0
1.6
1.6
2
2
2
4.0
2
2
2
2
0
1.4
6.5
6.5
6.5
6.5
13.0
0.2
0.9
1.4
0.9
Reference
Current
(mA)
0
0
0
0
0
0
0
0
-8.1
0
0
0
0
0
8.1
0
0
0
0
-4.6
¾
0
0
0
0
4.6
0
0
0
0
Red signal input
Green signal input
Blue signal input
CH display signal blue input
Function
CH display mode switching (latch mode/through mode)
CH display signal green input
CH display signal red input
Blue input signal sample and hold capacitor
Blue primary color input
Green primary color input
Red primary color input
Low-voltage signal GND
Red input signal sample and hold capacitor
Internal reference voltage
B-axis drive control
R-axis drive control
Common drive control
Low-voltage signal V
CC
g
correction starting point control
Common cut-off control
R-axis cut-off control
B-axis cut-off control
High-voltage signal GND
¾
Signal output center voltage control
High-voltage signal V
CC
Flip-flop output
Clamp pulse input
Vertical drive pulse input
Horizontal drive pulse input
Note 1: Reference voltage and reference current are for DC bias with no signal.
The current which flows into the IC considered to be positive current.
2
2002-02-13
TA8696F
Pin No.
Pin Name and Function
Typical Signal Level
Internal bias
Mode switch
Switches channel indication
mode
1
High level: Character mode
Low level: Latch mode
(synchronized with HD)
V
iH
=
L.V
CC
V
iL
=
GND
V
TH
=
1.9 V
V
iH Max
=
L.V
CC
V
iL Min
=
GND
Clamped on L.V
CC
and GND
Internal bias
CH B input
2
3
4
CH G input
CH R input
Channel indication signal
Input pin
0V
5V
0V
V
TH
=
1.7 V
V
iH Max
=
5.5 V
V
iL Min
=
GND
Clamped on GND
2
3
4
60 kW
40 kW
L.V
CC
RS/H
External capacitance 1
mF
5
10
100
W
BS/H
5
10
Internal bias
1.6 V
100
W
1 kW 1 kW
50
mA
2 kW
50
mA
6
7
8
14 kW
L.V
CC
5 kW
V
ref
11
Internal standard voltage
reference pin
Internal bias
1.6 V
Permissible load current
0
Clamped on L.V
CC
and GND
11
32 kW
50
mA
30 kW
8 kW
50
mA
L.V
CC
Internal bias
White signal level
Black signal level
1.6 V
1.6 V
0.9 V
1
30 kW
0V
Interface Current
L.V
CC
50 kW
Regenerate B/R-axis direct Permissible load current
current voltage
0
Capaciator pin
Clamped on L.V
CC
and GND
6
7
8
B input
G input
R input
Primary color input pins
Maximum input level 1.4 V
p-p
Clamped on L.V
CC
and GND
3
2002-02-13
TA8696F
Pin No.
Pin Name and Function
Typical Signal Level
Interface Current
L.V
CC
5 kW
12
13
18
19
40 kW
50
mA
5 kW
12
13
18
19
B drive
R drive
R cut-off
B cut-off
Internal bias L.V
CC
/2
V
iH Max
=
L.V
CC
V
iL Min
=
GND
Clamped on L.V
CC
and GND
L.V
CC
5 kW
20 kW
Internal bias L.V
CC
/2
14
17
COM drive
COM cut-off
V
iH Max
=
L.V
CC
V
iL Min
=
GND
Clamped on L.V
CC
and GND
14
17
40 kW
50
mA
50
mA
L.V
CC
5 kW
Internal bias L.V
CC
/2
16
g
off-set
V
iH Max
=
L.V
CC
V
iL Min
=
GND
Clamped on L.V
CC
and GND
16
50
mA
50
mA
6.5 kW
100
mA
100
mA
40 kW
Inverted in sync with VD
11.5 Black
signal level
8.5 White
signal level
6.5
4.5 White
signal level
1.5 Black
signal level
Clamped on H.V
CC
and GND
H.V
CC
23
24
G output
B output
50 kW
4
2002-02-13
25 kW
22
23
24
50 kW
6.5 kW
22
R output
150
mA
TA8696F
Pin No.
Pin Name and Function
Typical Signal Level
Interface Current
H.V
CC
Internal bias H.V
CC
/2
25
V
O
center
V
iH Max
=
H.V
CC
V
iL Min
=
GND
Clamped on H.V
CC
and GND
25
65 kW
65 kW
H.V
CC
13
W
30
W
8 kW
L.V
CC
50
mA
28
1 kW
H.V
CC
45 kW
3.0 V
29
27
21
L.V
CC
50
mA
50
mA
30
1 kW
Desaturated open collector
output
Maximum sink current
0.5 mA
(V
oL Max
=
0.3 V)
V
oH Max
=
H.V
CC
Clamped on H.V
CC
and GND
Be sure CP is correspondent
to the back porch of primary
color input signal.
Input
28
CP
Clamp pulse input
CP
V
TH
=
1.6 V
V
iH Max
=
5.5 V
V
iL Min
=
GND
Clamped on H.V
CC
and GND
Be sure
VD
falls within the
vertical blanking period of
primary color input signal.
5V
0V
1V
V
TH
=
V
iH Max
=
5.5 V
V
iL Min
=
GND
Clamped on H.V
CC
and GND
Be sure
HD
falls within the
horizontal blanking period of
primary color input signal.
5V
0V
30
HD
input
27
F.F. output
5V
0V
29
VD
input
Vertical drive pulse input
1H
V
TH
=
0.9 V
V
iH Max
=
5.5 V
V
iL Min
=
GND
Clamped on GND
100
mA
5
2002-02-13
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