MITSUMI

TFT Liquid Crystal Interface MM1288CQ

TFT Liquid Crystal Interface

Monolithic IC MM1288CQ

Outline

This IC was developed as an interface IC for video equipment having a small monitor. This IC performs

correction and polarity identification to convert RGB signals into TFT liquid crystal RGB signals. A common

inversion circuit and sync separation circuit are built-in.

Features

1. Power supply voltage +13V, 0V or +5V, -8V

2. Built-in polarity ID circuit

3. Built-in

correction circuit

4. Common inversion circuit built-in

5. 2 input switch built-in

6. Built-in contrast adjustment circuit

7. Built-in sync separation circuit

Package

QFP-48A

Applications

1. Navigation systems

2. Pachinko games (models with color TFT)

3. Videophones, conferencing systems

4. Game equipment

5. Others

MITSUMI

TFT Liquid Crystal Interface MM1288CQ

Pin no.

Pin name

Function

Internal equivalent

circuit diagram

Pin no.

Pin name

Function

Internal equivalent

circuit diagram

19, 45

SUB

Subcontrast

CONTRAST

Contrast

Positive polarity

power supply pin 1

21, 42

SUB

Sub bright

BRIGHT

COMMON

Common

DC VOLT

operating

point adjustment

COMMON

Common

INV

inversion

COMMON

Common

SWING

amplitude

adjustment

29, 31

RGB OUT

RGB output

COMMON

Common

OUT

output

Negative

polarity pin

OUT DC V

G output

DETECT

detection

Positive polarity

power supply pin 2

BRIGHT

Bright

INV

Inversion

GAMMA2

Gamma

correction 2

CENTER DC

Adjust center

voltage

GAMMA1

Gamma

correction 1

Switch

47mm 75mm 0.8mm printed circuit board (glass epoxy) board mounted.

MITSUMI

TFT Liquid Crystal Interface MM1288CQ

Absolute Maximum Ratings

(Ta=25�C)

Item

Symbol

Ratings

Units

Storage temperature

STG

-40~+125

�C

Operating temperature

OPR

-20~+85

�C

1-GND

Power supply voltage

2-V

GND-V

Allowable loss 1

Pd 1

500

Allowable loss 2

Pd 2

1000

Output

Input

correction

Output is given characteristics as shown at left

according to LCD panel characteristics.

Pins 34 and 39 adjust the slope change position.

INV (40PIN)

RGB input

Inversion pulse

Primary color

output

COMMON output

The primary color output (pins 29, 31, 33) and COMMON output (pin 27) are inverted according to the

inversion pulse input to this pin. When COMMON INV (pin 26) has Vcc2 potential, the relationships between

the input, output and inversion pulse are as shown in the figure below.

Note : GAMMA1, GAMMA2 (Pins 34, 39)

DC voltage applied to these pins sets

correction DC voltage gain change point.

MITSUMI

TFT Liquid Crystal Interface MM1288CQ

Electrical Characteristics

(Except where noted otherwise, Ta=25�C, All SW : A, V

1=5.0V,

2=13V, GND=0V, V

=0V, T16; SG1, T40; SG2, V46=3.5V)

Item

Symbol

Measurement conditions

Min. Typ. Max. Units

1 pin operating power

4.5

5.0

5.5

supply voltage range

Operating power supply voltage

2+2

10.0

13.0

14.0

range when on power supply +2

GND

Operating power supply voltage

2�

4.5

5.0

5.5

range when on power supply �

�

-8.5

-8.0

-6.5

Consumption current 1

1=5V

8.5

15.0

Consumption current 2

2=13V

17.0

22.0

Voltage gain

Voltage gain difference

VSW

0.7

between inputs

Reversed/non-reversed

voltage gain difference

VINV

0.7

RGB voltage gain

differences

VRGB

0.7

Maximum voltage gain

max.

Minimum voltage gain

min.

Subcontrast change

VSUB

�1

Input dynamic range

INDR

1.5

1.9

P-P

-50

-44

Switch crosstalk

TSW

-50

-44

Measure ratio of SG3 and
T29, 31, 33 sine waves.
Measure T29, 31, 33 sine
wave ratio when SW47 :
B and V47=0V and 5V.

Measure T29, 31, 33 sine

wave ratio when T40=0V

and 5V.

Measure T29, 31, 33 sine
wave ratio.
SW43 ; B, V43=4.5V
Measure SG3 and T29,
31, 33 sine wave ratio.
SW43 ; B, V43=4.5V
Measure SG3 and T29,
31, 33 sine wave ratio.

SW2~4, 19, 45 ; B, T2~4 ; SG3
Adjust V46 so that T29, 31 and 33
amplitude is 8V. Measure ratio between
T29, 31 and T33 sine waves when V19
and 45 are 0.5~4.5V.

SW2~4, 7~9 ;
B
T2~4, 7~9 ;
SG3
Adjust V46
so that T29,
31 and 33
amplitude is
8V.

SW2~4, 43, 47 ; B, T2~4 ; SG4, V47=5V
Adjust V46 so that T29, 31 and 33
amplitude is 8V, and adjust V43 so that
T29, 31 and 33 sine wave amplitude is
5V

P-P

. Vary SW47 in this state and

measure 1MHz spectrum change.

SW2~4, 43 ; B, T2~4 ; SG3, V43=1.5V
Adjust V46 so that T29, 31 and 33
amplitude is 9V. Vary SG3 amplitude and
measure SG3 amplitude at the point
where T29, 31 and 33 signals start to be
saturated.

SW7~9, 43, 47 ; B, T7~9 ; SG4, V47=5V
Adjust V46 so that T29, 31 and 33
amplitude is 8V, and adjust V43 so that
T29, 31 and 33 sine wave amplitude is
5V

P-P

. Vary SW47 in this state and

measure 1MHz spectrum change.

MITSUMI

TFT Liquid Crystal Interface MM1288CQ

Item

Symbol

Measurement conditions

Min. Typ. Max. Units

Crosstalk between RGB

TRGB

-48

-40

Output dynamic range (B-B)

DR B-B

P-P

Output dynamic range (B-W)

DR B-W

6.0

7.0

P-P

Output center voltage

6.3

6.5

6.7

Output center voltage change

3.0

Bright change

BRIT

10.0 13.5

Amplitude difference between

BRIT RGB

-0.5

0.5

bright RGB signals

Sub-bright change

SUBB

�1

Frequency characteristic

fmax.

4.0

5.0

MHz

COMMON output amplitude

COM

6.0

6.5

P-P

COMMON output maximum amplitude V

COM

max.

8.0

P-P

COMMON output minimum amplitude V

COM

min.

-0.1

0.1

P-P

COMMON output center

max.

8.5

maximum voltage

COMMON output center

min.

4.5

minimum voltage

Sync separation input

-50

-35

-20

�A

sensitivity current

Sync separation output low voltage

SYNL

0.2

0.4

Sync input threshold voltage

1.4

1.9

2.4

Sync input input current

I15

-1.5

�A

Subcontrast input current

I18, I41

-60

�A

SW2~4 ; B, T2~4 ; SG4, V46=0.5V
Measure T29, 31 and 33 signals.
SW2~4, 43 ; B, T2~4 ; SG4, V43=4.5V
Adjust V46 so that T29, 31 and 33
amplitude is 9V and measure T29, 31 and
33 sine wave amplitude.
Adjust V46 so that T29, 31 and 33 amplitude is
0V and measure T29, 31 and 33 DC voltage.

Measure the difference between T29, 31 and 33
signal clamp levels when V46=0.5V and 4.5V.
Adjust V46 so that T31 amplitude is 5.7V
and measure T29 and 33 amplitude ratio.
After adjusting V46 so that T29, 31 and 33
amplitude is 6V, with SW21 and 42 : B, vary
V21 and 42 between 8~10V and measure
the maximum value of the difference
between T31 and T29, 33 amplitudes.
SW2~4, 29, 31, 33 ; B, T2~4 ; SG4
Adjust V46 so that T29, 31 and 33
amplitude is 8V, then adjust V43 so that
T29, 31 and 33 sine wave amplitude is
5V

P-P

. Vary sine wave frequency at

measure cutoff frequency.
Measure T27 amplitude.
SW28 ; B, V28=12V Measure T27 amplitude.
SW28 ; B, V28=0V T27 amplitude.
SW22, 28 ; B, V22=5V, V28=0V
Measure T27 amplitude.
SW22, 28 ; B, V22=0.5V, V28=0V
Measure T27 DC voltage
Increase current flowing out on T10, and
measure outflow current when T14
voltage changes from high to low.
Measure T14 voltage when 5V is applied to T10.
Measure T14 inverted input voltage when
T16 voltage is changed from 0 5V.
SW16 ; B Apply 0V to T16 and measure I16.

SW2 ; B T2 ; SG4
Adjust V46 so that T33 amplitude is 8V,
and adjust V43 so that T33 sine wave
amplitude is 5V

P-P

. Then measure the

difference between T33 and T29, 31
signals 1MHz spectrum. Measure in the
same way for G B,R and B R, G.

SW19, 45, 46 ; B
Measure I19 and 45 when V19 and 45 are
0.5V and 4.5V.

Adjust V46 so that T29, 31 and 33 amplitude
is 0V and measure the difference T29, 31 and
33 DC voltage when V35=5V and 8v

MITSUMI

TFT Liquid Crystal Interface MM1288CQ

Item

Symbol

Measurement conditions

Min. Typ. Max. Units

Sub-bright input current

I20, I38

-50

�A

COMMON DC VOLT input current

I21

-100

�A

COMMON INV threshold voltage

6.0

6.5

7.0

COMMON INV input current

I24

-90

�A

COMMON SWING input current

I26

-60

�A

GAMMA1 input voltage

I32

�A

GAMMA2 input voltage

I35

-6

�A

INV threshold voltage

2.5

3.0

3.5

INV input current

I36

-2

�A

Contrast input current

I39

-60

�A

Bright input current

I42

�A

CENTER DC input current

I35

105

110

165

�A

SW threshold voltage

0.8

1.4

2.0

SW input current

I43

4.5

�A

GAMMA1 fluctuation

V34

0.8

1.2

2.1

GAMMA2 fluctuation

V39

0.8

1.2

2.1

H-to-L common transport delay time

PHL

�S

L-to-H common transport delay time

PLH

�S

COMMON fall time

THL

�S

COMMON rise time

TLH

�S

Difference in COMMON

�S

rise and fall times

H-to-L primary color signal

PHL

�S

transport delay time

L-to-H primary color signal

PLH

�S

transport delay time

Primary color signal fall time

THL

�S

Primary color signal rise time

TLH

�S

Difference in primary color

�S

signal rise and fall times

SW39 ; B
Measure I39 when V39=1V.
Vary T40 voltage from 0 5V and measure
the voltage when T27 phase inverts.
Measure I40 when V40 is 0V.
SW43 ; B
Measure I43 when V43 is 0.5V and 4.5V.
Measure I46 when V46=1.7V.
Measure I35 when V35=V

SW2~4, 47 ; B, T2~4 ; SG3
Adjust V46 so that T29, 31 and 33
amplitude is 8V. Vary V47 voltage from
0 5V and measure V47 when T29, 31
and 33 sine waves disappear.
SW47 ; B Measure I47 when V47=0V.
SW2~4, 34, 43 ; B, T2~4 ; SG5
Adjust V43 so that T29, 31 and 33 amplitude is
3V. Vary V34 voltage from 3 6V and measure
the amount of T29, 31 and 33 voltage change.
SW2, 3, 4, 39, 43 ; B, T2~4 ; SG5
Adjust V43 so that T29, 31 and 33 amplitude is
3V. Vary V39 voltage from 6.2 8V and measure
the amount of T29, 31 and 33 voltage change.

SW27, 28 ; B, T40 ; SG6
Adjust V28 so that T27 amplitude is 6V.

= t

THL

-t

TLH

SW29, 31, 33 ; B, T40 ; SG6
Adjust V46 so that T29, 31 and 33
amplitude is 8V.

= t

THL

-t

TLH

SW22 ; B
Measure I22 when V22=0V.
SW26 ; B
Vary V26 between 0~13V and measure
V26 when T27 phase inverts.
SW26 ; B
Measure I26 when V26=0 and 13V.
SW28 ; B
Measure I26 when V26=9 and 12V.
SW34 ; B
Measure I34 when V34=11V.

SW21, 42, 46 ; B
Measure I21 and 42 when V21 and 42 are 7.5V and 10.5V.

Электронный компонент: MM1288CQ