TSL1020
20 + 1 channel buffer for TFT-LCD panels
Features
■
■
■
■
■
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Wide supply voltage: 5.5V to 16.8V
Low operating current: 8.5mA typ. at 25°C
Bandwidth at -3dB: 5MHz
High output current COM amplifier: ±150mA
Industrial temperature range: -40°C to +95°C
Small package: TQFP48 ePad
Pin connections (top view)
COMo
COMi
VSS
VDD
VDD
7 x 7mm TQFP48 ePad
Application
■
TFT liquid crystal display (LCD)
48 47 46 45 44 43 42 41 40 39 38 37
Description
The TSL1020 is composed of 20 + 1 channel
buffers which are used to buffer the reference
voltage for gamma correction in thin film transistor
(TFT) liquid crystal displays (LCD).
One COM amplifier is able to deliver high output
current, up to ±150mA. Amplifiers A and B feature
positive single supply inputs for common mode
voltage, thus can be used for the highest gamma
voltages. The amplifiers C to T inclusive, and the
COM amplifier, feature negative single supply
inputs and are dedicated to the lowest gamma
voltages.
The TSL1020 is fully characterized and
guaranteed over a wide industrial temperature
range (-40 to +95°C).
VSS
1
2
3
4
5
6
J
Q
P
O
N
T
S
R
36
35
34
33
M
L
K
I
H
G
F
E
D
C
B
A
32
31
30 VDD
29
28
27
26
25
21 22 23 24
7
8
9
10
11
12
13
14 15 16 17 18 19 20
VDD
VSS
January 2008
Rev 1
1/16
www.st.com
16
Absolute maximum ratings and operating conditions
TSL1020
1
Absolute maximum ratings and operating conditions
Table 1.
Symbol
V
CC
V
in
R
thja
T
lead
T
stg
T
j
ESD
Absolute maximum ratings
Parameter
Supply voltage (V
DD
- V
SS
)
Input voltage
Thermal resistance junction to ambient for TQFP48
ePad not thermally connected to PCB
ePad thermally connected to PCB
Lead temperature (soldering 10 seconds)
Storage temperature
Junction temperature
Human body model (HBM)
(1)
Machine model (MM)
(2)
Value
18
V
SS
-0.5 to V
DD
+0.5
85
36
260
-65 to +150
150
2000
200
Unit
V
V
°C/W
°C
°C
°C
V
V
1. Human body model: A 100pF capacitor is charged to the specified voltage, then discharged through a
1.5kΩ resistor between two pins of the device. This is done for all couples of connected pin combinations
while the other pins are floating.
2. Machine model: A 200pF capacitor is charged to the specified voltage, then discharged directly between
two pins of the device with no external series resistor (internal resistor < 5Ω). This is done for all couples of
connected pin combinations while the other pins are floating.
Table 2.
Symbol
V
CC
T
amb
V
in
Operating conditions
Parameter
Supply voltage (V
DD
- V
SS
)
Ambient temperature
Input voltages for buffers A & B
Input voltages for buffers C to T & COM
Value
5.5 to 16.8
-40 to +95
V
SS
+ 1.5V to V
DD
V
SS
to V
DD
- 1.5V
Unit
V
°C
V
2/16
TSL1020
Typical application schematics
2
Typical application schematics
Figure 1.
A typical application schematic for the TSL1020
Vcc
16
30
VDD
42
+
Cs
R1
10uF
R2
Gnd
R3
22
21
20
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
19
17
15
14
13
12
11
10
9
8
6
5
4
3
2
1
48
47
46
45
Gamma 19
Gamma 18
Gamma 17
Gamma 16
Gamma 15
Gamma 14
Gamma 13
To colunm driver
Gamma 12
Gamma 11
Gamma 10
Gamma 9
Gamma 8
Gamma 7
Gamma 6
Gamma 5
Gamma 4
Gamma 3
Gamma 2
Gamma 1
Gamma 0
R4
23
R5
24
R6
25
R7
26
R8
27
R9
28
R10
29
R11
31
R12
32
R13
33
R14
34
R15
35
R16
36
R17
37
R18
38
R19
39
R20
40
R21
Gnd
Com Ref. Voltage
41
COM
44
VCOM
VSS
7
18
43
TSL1020
Gnd
Note that:
●
●
●
Amplifiers
A
&
B
have their input voltages in the range V
SS
+1.5V to V
DD
. This is why
they must be used for high level gamma correction voltages.
Amplifiers
C to T
have their input voltages in the range V
SS
to V
DD
-1.5V. This is why
they must be used for medium-to-low level gamma correction voltages.
Amplifier
COM
has its input voltage range from V
SS
to V
DD
-1.5V.
3/16
Electrical characteristics
TSL1020
3
Table 3.
Symbol
V
io
ΔV
io
I
ib
R
in
C
in
V
OL
V
OH
I
out
PSRR
I
CC
SR
t
s
BW
G
m
C
s
Electrical characteristics
Electrical characteristics for T
amb
= 25°C , V
DD
= +5V, V
SS
= -5V, R
L
= 10kΩ C
L
= 10pF
,
(unless otherwise specified)
Parameter
Input offset voltage
Input offset voltage drift
Input bias current
Input impedance
Input capacitance
Output voltage low
Output voltage high
Short circuit output current
COM buffer
Power supply rejection ratio
Supply current
Slew rate
(rising & falling edge)
Settling time
Bandwidth at -3dB
Phase margin
Channel separation
V
CC
= 6.5 to 15.5V
No load
-3.5V < V
out
< +3.5V
10% to 90%
Settling to 0.1%, V
out
= 2V step
,
R
L
=10kΩ C
L
=10pF
R
L
=10kΩ C
L
=10pF
,
f=1MHz
80
±150
100
8.5
1.1
5
5
70
75
12
dB
mA
V/µs
µs
MHz
degrees
dB
I
out
= -5mA
Buffers C to R
Buffers S, T & COM
I
out
= 5mA for buffers A & B
(A to T buffers)
4.82
Test conditions
V
icm
= 0V
-40°C < T
amb
< +95°C
V
icm
= 0V, buffers A & B
V
icm
= 0V, buffers C to T & COM
1
1.35
-4.88
-4.92
4.87
±40
mA
-4.80
-4.85
5
140
70
Min.
Typ.
Max.
12
Unit
mV
µV/°C
nA
GΩ
pF
V
V
Note:
Limits are 100% production tested at 25°C. Behavior at the temperature range limits is
guaranteed through correlation and by design.
4/16
TSL1020
Electrical characteristics
Figure 2.
12
11
10
9
8
7
6
4
Supply current vs. supply voltage
for various temperatures
Figure 3.
0.0
Output offset voltage (eq. V
io
) vs.
temperature
T
AMB
=-40°C
T
AMB
=+25°C
Output offset voltage (eq. Vio) (mV)
Current consumption (mA)
-0.1
-0.2
-0.3
V
CC
= 5.5V, 10V, 16.8V
-0.4
-40
-20
0
20
40
60
80
100
T
AMB
=+95°C
6
8
10
12
14
16
18
Power supply voltage (V)
Temperature (°C)
Figure 4.
60
Iib Input bias current (nA)
Input current (I
ib
) vs. temperature
Figure 5.
60
Iib Input bias current (nA)
Input current (I
ib
) vs. temperature
Amplifiers
C to COM, PNP Inputs
V
CC
= 5.5V, 10V, 16.8V
55
50
45
40
35
30
-40
55
50
45
40
35
30
-40
Amplifiers
A & B, NPN Inputs
V
CC
= 5.5V, 10V, 16.8V
-20
0
20
40
60
80
100
-20
0
20
40
60
80
100
Temperature (°C)
Temperature (°C)
Figure 6.
200
160
Output current (mA)
Output current capability vs.
temperature
Figure 7.
Output current capability vs.
temperature
80
Output current (mA)
120
80
40
0
-40
-80
-120
-160
-200
-40
-20
0
20
40
60
80
100
V
CC
= 5.5V
V
CC
= 10V
V
CC
= 16.8V
40
0
V
CC
= 5.5V
V
CC
= 10V, 16.8V
-40
Amplifiers A & B
-80
-40
Amplifiers C to T
-20
0
20
40
60
80
100
Temperature (°C)
Temperature (°C)
5/16
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