ST TSL1018 User Manual

18 + 1 channel buffer for TFT-LCD panels

Features

■ Wide supply voltage: 5.5V to 16.8V

■ Low operating current: 8mA typical at 25°C

■ Bandwidth at -3dB: 3.5MHz

■ High output current COM amplifier: ±150mA

■ Industrial temperature range: -40°C to +95°C

■ Small package: TQFP48 ePad

TSL1018

7 x 7mm TQFP48 ePad

Application

■ TFT liquid crystal display (LCD)

Description

The TSL1018 is composed of 18 + 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 value, up to ±150mA. Amplifiers A and B feature positive single supply inputs for common mode voltage, thus can be used for highest gamma voltages. The amplifiers C to R inclusive, and the COM amplifier, feature negative single supply inputs and are dedicated to the lowest gamma voltages.

The TSL1018 is fully characterized and guaranteed over a wide industrial temperature range (-40 to +95°C).

VSS

VSS VDD

VDD

Pin connections (top view)

COMo

VDD

VSS

42 41

47

48 44 43

47

48 44 43

1

2

2 3

3 4

4 5

5 6

6

7

7 8

8

9

10

10 11

11 12

12

131415 161718 19 20 21 22

VDD

42 41

R

O

N

M

L

K

J

I

H

G

F

E

D

C

B

VSS

COMi

VDD

40 39 38 3746 45

36

23 24

36 35

35 34

34 33

33 32

32 31

31 30

30

VSS

29

VDD

28

28 27

27 26

26 25

25

Q

P

A

July 2008 Rev 2 1/15

www.st.com

15

Absolute maximum ratings and operating conditions TSL1018

1 Absolute maximum ratings and operating conditions

Table 1. Absolute maximum ratings

Symbol Parameter Value Unit

V

I

OUT

Supply voltage 18 V

DD

Input voltage V

IN

Output current (A to R buffers) Output current (COM buffer)

-0.5V to V

SS

40

150

+0.5V V

DD

Thermal resistance junction to ambient for TQFP48

R

THJA

P

D

T

LEAD

T

STG

T

J

ESD

1. PD is calculated with T

2. 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.

3. 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.

4. Charged device model: all pins and package are charged together to the specified voltage and then discharged directly to the ground through only one pin.

Table 2. Operating conditions

ePad not thermally connected to PCB ePad thermally connected to PCB

Power dissipation

(1)

for TQFP48 ePad ePad not thermally connected to PCB ePad thermally connected to PCB

85 36

1470 3470

Lead temperature (soldering 10 seconds) 260 °C

Storage temperature -65 to +150 °C

Junction temperature 150 °C

(3)

(2)

(4)

THJA

2000

200

1500

.

Human body model (HBM)

Charged device model (CDM)

= 25°C, TJ = 150°C and R

amb

mA

°C/W

mW

VMachine model (MM)

Symbol Parameter Value Unit

T

V

amb

Supply voltage (VDD - VSS) 5.5 to 16.8 V

CC

Ambient temperature -40 to +95 °C

Input voltages for buffers A & B V

V

IN

Input voltages for buffers C to R & COM V

2/15

+ 1.5V to V

SS

to VDD - 1.5V

SS

DD

V

TSL1018 Typical application schematics

2 Typical application schematics

Figure 1. Typical application schematic for the TSL1018

Vcc

43

8

16

29

41

VDD

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

Q

R

17

15

14

13

12

11

10

9

6

532

4

3

1

48

47

46

Gamma 17

Gamma 16

Gamma 15

Gamma 14

Gamma 13

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

To colunm driver

Gnd

+

Cs

10uF

R1

20

R2

21

R3

22

R4

23

R5

24

R6

25

R7

26

R8

27

R9

28

R10

31

R11

R12

33

R13

34

R14

35 2

R15

36

R16

37

R17

38

R18

39

R19

Com Ref. Voltage

Gnd

40

7

181930

VSS

Gnd

42

COM

44

45

TSL1018

VCOM

Note that:

● Amplifiers A & B have their input voltages in the range V

+1.5V to VDD. This is why

SS

they must be used for high level gamma correction voltages.

● Amplifiers C to R have their input voltages in the rangeV

to VDD-1.5V. This is why

SS

they must be used for medium-to-low level gamma correction voltages.

● Amplifier COM has its input voltage range from V

3/15

toVDD-1.5V.

SS

Electrical characteristics TSL1018

3 Electrical characteristics

Table 3. Electrical characteristics for T

= 25°C , VDD=+5V, VSS=-5V, RL=10kΩ, CL= 10pF

amb

(unless otherwise specified)

Symbol Parameter Test conditions Min. Typ. Max. Unit

V

ΔV

R

C

V

I

OUT

Input offset voltage V

IO

Input offset voltage drift -40°C < T

IO

I

Input bias current

IB

Input impedance 1 GΩ

IN

Input capacitance 1.35 pF

IN

Output voltage low

OL

Output voltage high I

OH

Output current

PSRR Power supply rejection ratio V

I

SR

Supply current No load 8 11 mA

CC

Slew rate (rising & falling edge)

Settling time Settling to 0.1%, V

t

s

BW Bandwidth at -3dB R

G

Phase margin RL=10kΩ, CL=10pF 60 degrees

m

Channel separation f=1MHz 75 dB

C

s

= 0V 12 mV

ICM

< +85°C 5 μV/°C

amb

= 0V, buffers A & B

V

ICM

V

= 0V, buffers C to R & COM

ICM

I

=-5mA

OUT

Buffers C to P Buffers Q, R & COM

= 5mA for buffers A & B 4.82 4.87 V

OUT

-4.85

-4.92

140

70

-4.80

-4.85

(A to R buffers) ±40

COM buffer ±150

= 6.5 to 15.5V 80 100 dB

CC

OUT

< +4V

1.1 V/μs

=2V step 5 μs

OUT

-4V < V 20% to 80%

=10kΩ, CL=10pF 3.5 MHz

L

nA

V

mA

Note: Limits are 100% production tested at 25°C. Behavior at the temperature range limits is

guaranteed through correlation and by design.

4/15

TSL1018 Electrical characteristics

Figure 2. Supply current vs. supply voltage

Current consumption (mA)

for various temperatures

12

T

=-40°C

T

AMB

=+95°C

10

T

=+25°C

AMB

8

6

4681012141618

Power supp ly voltage (V)

Figure 3. Output offset voltage (eq. VIO) vs.

temperature

1.0

VCC=5.5 V, 10V, 1 6.8V

0.5

0.0

Output offset voltage (mV)

-0.5

-1.0

-40-20 0 20406080

Ambient Temperature (°C)

Figure 4. Input current (IIB) vs. temperature Figure 5. Input current (IIB) vs. temperature

120

100

Buffers A & B VCC=5.5V, 10V, 16.8V

80

120

100

Buffe rs C to COM VCC=5.5 V, 10 V, 16.8V

80

60

40

Input bias current (nA)

20

0

-40-20 0 20406080

Ambient Temperature (°C)

Figure 6. Output current capability vs.

temperature

200

150

100

50

0

-50

Output current (mA)

-100

-150

-200

Buffers A & B

-40-200 20406080

Ambient Temperature (°C)

VCC=10VVCC=5.5V

VCC=16.8V

60

40

Input bias current (nA)

20

0

-40-20 0 20406080

Ambient Temperature (°C)

Figure 7. Output current capability vs.

temperature

80

60

40

20

0

-20

Output current (mA)

-40

-60

-80

VCC=5.5V

-40-20 0 20406080

Ambient Tem perature (°C)

VCC=10V , 16.8V

Buffers C to R

5/15